Jungle Drive and Other Stories
- Authors: Koenig, Nathalie
- Date: 2021-10-29
- Subjects: Creative writing (Higher education) South Africa , South African fiction (English) 21st century , South African poetry (English) 21st century , Short stories, South African (English) 21st century
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/192225 , vital:45207
- Description: My thesis comprises prose in a variety of forms with porous borders, including the short story, flash fiction and prose poetry. I am attracted to a processual approach to writing as I like the potential for experimentation with spontaneity and textual improvisation within and across forms that this allows. I am influenced by Joanna Ruocco’s novellas, The Mothering Coven and Dan, whose worlds are built with generously scattered references, interesting words and strange features, delivered in a dead-pan tone that joyfully scrambles my logic. At the same time, I am inspired by the precision and beauty of Tina May Hall’s prose, and how she plays in the space between the natural and magical worlds. In addition, I draw on the musicality and rhythm of Noy Holland and JA Tyler’s prose, adding a corporeal layer to the words, sounds and movement of the text. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-10-29
- Authors: Koenig, Nathalie
- Date: 2021-10-29
- Subjects: Creative writing (Higher education) South Africa , South African fiction (English) 21st century , South African poetry (English) 21st century , Short stories, South African (English) 21st century
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/192225 , vital:45207
- Description: My thesis comprises prose in a variety of forms with porous borders, including the short story, flash fiction and prose poetry. I am attracted to a processual approach to writing as I like the potential for experimentation with spontaneity and textual improvisation within and across forms that this allows. I am influenced by Joanna Ruocco’s novellas, The Mothering Coven and Dan, whose worlds are built with generously scattered references, interesting words and strange features, delivered in a dead-pan tone that joyfully scrambles my logic. At the same time, I am inspired by the precision and beauty of Tina May Hall’s prose, and how she plays in the space between the natural and magical worlds. In addition, I draw on the musicality and rhythm of Noy Holland and JA Tyler’s prose, adding a corporeal layer to the words, sounds and movement of the text. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-10-29
Wille Dagga
- Authors: Kruger, Liesel Hilge
- Date: 2021-10-29
- Subjects: Kaaps , Creative writing (Higher education) South Africa , Diaries -- Authorship , South African poetry 21st century , Graphic novels 21st century , Fiction History and criticism , Kaaps poetry 21st century
- Language: Afrikaans
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/192230 , vital:45208
- Description: My thesis isse graphic novel/fumetto (photos)/ poetry hybrid. It speel af innie Kylemore, ’n klein ghetto net byte Stellenbosch. Vi ways wat mens genre en visual borders kan veskyf kyk ek ve’al na ‘Arkham Asylum: A Serious House on Serious Earth’ geskryf dee Grant Morrison en illustrated dee Dave McKean. Met ‘Arkham Asylum’ combine McKean painting, photos, collage en illustration. ‘Bitterkomix’ dee Anton Kannemeyer en Conrad Botes is nogge inspirasie in terme vanne meer fluid approach tot style waa die storie die art-style dictate. Ek kyk oek ve’al na ‘Fun Home’ dee Alison Bechdel, vi haa incredible ability om inne tragic, maa somehow humorous way, oo sexual repression te skryf. Oek kyk ek na ‘Dykes to Watch Out For’, dee Bechdel en ‘Wimmen’s Comix’ (Michele Brand, Diane Noomin, et al.) vi die unapologetic manier waa’op díe vrouens oorie vroue liggaam geskryf et. Die struktuur is largely influenced dee Joe Sacco se ‘Palestine’, waa’in hy die broader storie van Palestine vetel innie form van episodic short stories. Vi die sensitiewe handling van LGBTQ themes kyk ek na ‘Death: The Time of Your Life’ dee Neil Gaiman en ‘Blue is the Warmest Colour’ dee Julie Maroh. Ek draw ook oppie wêk van Nathan Trantraal en Gert Vlok Nel se poetry, virrie way hoe hulle oo arme mense skryf, Trantraal oo Bishop Lavis, Vlok Nel oo Beaufort Wes. En oek vi hoe beide skryf innie stem wat hulle praat. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-10-29
- Authors: Kruger, Liesel Hilge
- Date: 2021-10-29
- Subjects: Kaaps , Creative writing (Higher education) South Africa , Diaries -- Authorship , South African poetry 21st century , Graphic novels 21st century , Fiction History and criticism , Kaaps poetry 21st century
- Language: Afrikaans
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/192230 , vital:45208
- Description: My thesis isse graphic novel/fumetto (photos)/ poetry hybrid. It speel af innie Kylemore, ’n klein ghetto net byte Stellenbosch. Vi ways wat mens genre en visual borders kan veskyf kyk ek ve’al na ‘Arkham Asylum: A Serious House on Serious Earth’ geskryf dee Grant Morrison en illustrated dee Dave McKean. Met ‘Arkham Asylum’ combine McKean painting, photos, collage en illustration. ‘Bitterkomix’ dee Anton Kannemeyer en Conrad Botes is nogge inspirasie in terme vanne meer fluid approach tot style waa die storie die art-style dictate. Ek kyk oek ve’al na ‘Fun Home’ dee Alison Bechdel, vi haa incredible ability om inne tragic, maa somehow humorous way, oo sexual repression te skryf. Oek kyk ek na ‘Dykes to Watch Out For’, dee Bechdel en ‘Wimmen’s Comix’ (Michele Brand, Diane Noomin, et al.) vi die unapologetic manier waa’op díe vrouens oorie vroue liggaam geskryf et. Die struktuur is largely influenced dee Joe Sacco se ‘Palestine’, waa’in hy die broader storie van Palestine vetel innie form van episodic short stories. Vi die sensitiewe handling van LGBTQ themes kyk ek na ‘Death: The Time of Your Life’ dee Neil Gaiman en ‘Blue is the Warmest Colour’ dee Julie Maroh. Ek draw ook oppie wêk van Nathan Trantraal en Gert Vlok Nel se poetry, virrie way hoe hulle oo arme mense skryf, Trantraal oo Bishop Lavis, Vlok Nel oo Beaufort Wes. En oek vi hoe beide skryf innie stem wat hulle praat. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-10-29
The impact of the BBB-EE policy instrument on wealth inequality : A case study on the banking sector of South Africa
- Moshikaro, Kei Kgaogelo Felia
- Authors: Moshikaro, Kei Kgaogelo Felia
- Date: 2021-10
- Subjects: Black Economic Empowerment (Program : South Africa) , Income distribution South Africa , South Africa Economic policy , South Africa Economic conditions 1991- , Banks and banking South Africa , South Africa. Financial Sector Regulation Act, 2017
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/191035 , vital:45052
- Description: It has been recognised that, whether measured in terms of income or wealth, South Africa remains as one of the most unequal societies in the world. Reducing these high levels of inequalities has been an important area of focus through the formulation of policy instruments by South African policy makers. Within a specific focus on the South African banking sector, the objective of this research is to ascertaining the extent to which addressing inequalities was in fact achieved through the changing of wealth ownerships under the Broad Based Black Economic Empowerment policy instrument. To contextualise, the thesis surveys literature on two stylised economic hypotheses on both income and wealth to understand the potential causes of their respective inequalities. An exploration of both income, wealth measurements and their distributions in South Africa are presented, in addition to policy instruments designed to ameliorate income and wealth inequalities in South Africa. The thesis further presents brief case studies from the literature on Brazil’s success in reducing its high income inequality and the Malaysian National Economic Policy empowerment program to effect wealth economic transformation, as comparatives to the South African experience. The thesis findings indicate that contrary to the objectives of the BBB-EE instrument and wealth transfers, the program within the banking sector resulted in highly unequal wealth shares and equally high concentration levels. The richest top one per cent of individuals participating in the BEE transactions in the banking sector captured 79 per cent of the total wealth transfers, this providing indications of extremely high concentrations of wealth. Further, wealth meaningfully cumulates at only the 50 percentage level of the wealth distribution, this additionally suggesting that wealth transfers featured less in the bottom half of the wealth distribution. The banking BBB-EE wealth Gini coefficient of 0.88 is evidence of the extremely high levels of inequality that resulted from the BBB-EE program within the banking sector. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2021
- Full Text:
- Date Issued: 2021-10
- Authors: Moshikaro, Kei Kgaogelo Felia
- Date: 2021-10
- Subjects: Black Economic Empowerment (Program : South Africa) , Income distribution South Africa , South Africa Economic policy , South Africa Economic conditions 1991- , Banks and banking South Africa , South Africa. Financial Sector Regulation Act, 2017
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/191035 , vital:45052
- Description: It has been recognised that, whether measured in terms of income or wealth, South Africa remains as one of the most unequal societies in the world. Reducing these high levels of inequalities has been an important area of focus through the formulation of policy instruments by South African policy makers. Within a specific focus on the South African banking sector, the objective of this research is to ascertaining the extent to which addressing inequalities was in fact achieved through the changing of wealth ownerships under the Broad Based Black Economic Empowerment policy instrument. To contextualise, the thesis surveys literature on two stylised economic hypotheses on both income and wealth to understand the potential causes of their respective inequalities. An exploration of both income, wealth measurements and their distributions in South Africa are presented, in addition to policy instruments designed to ameliorate income and wealth inequalities in South Africa. The thesis further presents brief case studies from the literature on Brazil’s success in reducing its high income inequality and the Malaysian National Economic Policy empowerment program to effect wealth economic transformation, as comparatives to the South African experience. The thesis findings indicate that contrary to the objectives of the BBB-EE instrument and wealth transfers, the program within the banking sector resulted in highly unequal wealth shares and equally high concentration levels. The richest top one per cent of individuals participating in the BEE transactions in the banking sector captured 79 per cent of the total wealth transfers, this providing indications of extremely high concentrations of wealth. Further, wealth meaningfully cumulates at only the 50 percentage level of the wealth distribution, this additionally suggesting that wealth transfers featured less in the bottom half of the wealth distribution. The banking BBB-EE wealth Gini coefficient of 0.88 is evidence of the extremely high levels of inequality that resulted from the BBB-EE program within the banking sector. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2021
- Full Text:
- Date Issued: 2021-10
& salt the earth behind you
- Authors: Naidoo, Prenesa
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , South African poetry (English) -- 21st century , Short stories, South African (English) -- 21st century , Diaries -- Authorship , Korean fiction -- 21st century -- History and criticism , Short stories, Argentine -- 21st century -- History and criticism , Arabic fiction -- Palestine 21st century -- History and criticism , Argentine fiction -- 21st century -- History and criticism
- Language: English
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178212 , vital:42921
- Description: My thesis is a collection of prose pieces in the form of short stories, flash fiction and prose poetry drawing on memory and lived experiences to explore the trauma of death, grief and displacement, solace and the paroxysms of home. As a young woman from an Indian South Africa community, Hindu superstitions and folktales are my second skin, and shape both my worldview and my writing. I am inspired by Lidia Yuknavitch’s observation that, “all artists see things that are not there”, and by Dambudzo Marechera’s belief that, “Beneath reality, there is always fantasy: the writer’s task is to reveal it, to open it out, to feel it, to experience it.” In my stories about trauma and grief, I often distort the line between seen and unseen worlds, where, for example, hauntings are taken seriously as lived experiences. I have also been influenced by Han Kang’s The White Book, Kali Fajardo-Anstine’s Sabrina & Corina, and Sandra Cisneros’ The House on Mango Street. Read together, Kang’s stand-alone short stories form part of a greater collective ‘memory’ or ‘life’; Fajardo-Anstine’s collection illustrates how to write about a specific female Latina community while still telling individual stories; and Cisneros’ fragments of memories tell the story of a person’s life in narratives which are as long or short as they need to be. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Naidoo, Prenesa
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , South African poetry (English) -- 21st century , Short stories, South African (English) -- 21st century , Diaries -- Authorship , Korean fiction -- 21st century -- History and criticism , Short stories, Argentine -- 21st century -- History and criticism , Arabic fiction -- Palestine 21st century -- History and criticism , Argentine fiction -- 21st century -- History and criticism
- Language: English
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178212 , vital:42921
- Description: My thesis is a collection of prose pieces in the form of short stories, flash fiction and prose poetry drawing on memory and lived experiences to explore the trauma of death, grief and displacement, solace and the paroxysms of home. As a young woman from an Indian South Africa community, Hindu superstitions and folktales are my second skin, and shape both my worldview and my writing. I am inspired by Lidia Yuknavitch’s observation that, “all artists see things that are not there”, and by Dambudzo Marechera’s belief that, “Beneath reality, there is always fantasy: the writer’s task is to reveal it, to open it out, to feel it, to experience it.” In my stories about trauma and grief, I often distort the line between seen and unseen worlds, where, for example, hauntings are taken seriously as lived experiences. I have also been influenced by Han Kang’s The White Book, Kali Fajardo-Anstine’s Sabrina & Corina, and Sandra Cisneros’ The House on Mango Street. Read together, Kang’s stand-alone short stories form part of a greater collective ‘memory’ or ‘life’; Fajardo-Anstine’s collection illustrates how to write about a specific female Latina community while still telling individual stories; and Cisneros’ fragments of memories tell the story of a person’s life in narratives which are as long or short as they need to be. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-04
A comprehensive approach to scalability assessment of ICTD projects : a case study of ICT4RED
- Authors: Baduza, Gugulethu Qhawekazi
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/178435 , vital:42939
- Description: Access restricted until April 2023. , Thesis (PhD) -- Faculty of Commerce, Information Systems, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Baduza, Gugulethu Qhawekazi
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/178435 , vital:42939
- Description: Access restricted until April 2023. , Thesis (PhD) -- Faculty of Commerce, Information Systems, 2021
- Full Text:
- Date Issued: 2021-04
Alternative approach to controlling citrus black spot disease
- Authors: Thabede, Jahman Thabo
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/178569 , vital:42951
- Description: Access restricted until April 2022. , Thesis (MSc) -- Faculty of Science, Biochemistry and Microbiology, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Thabede, Jahman Thabo
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/178569 , vital:42951
- Description: Access restricted until April 2022. , Thesis (MSc) -- Faculty of Science, Biochemistry and Microbiology, 2021
- Full Text:
- Date Issued: 2021-04
Bioethical analysis of selected biomedical issues in South Africa and other countries
- Authors: Rusere, Jean
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MPharm
- Identifier: http://hdl.handle.net/10962/178530 , vital:42948
- Description: Access restricted until April 2023. , Thesis (MPharm) -- Faculty of Pharmacy, Pharmacy, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Rusere, Jean
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MPharm
- Identifier: http://hdl.handle.net/10962/178530 , vital:42948
- Description: Access restricted until April 2023. , Thesis (MPharm) -- Faculty of Pharmacy, Pharmacy, 2021
- Full Text:
- Date Issued: 2021-04
Constraining simulation uncertainties in a hydrological model of the Congo River Basin including a combined modelling approach for channel-wetland exchanges
- Authors: Kabuya, Pierre Mulamba
- Date: 2021-04
- Subjects: Congo River Watershed , Watersheds -- Congo (Democratic Republic) , Hydrologic models , Rain and rainfall -- Mathematical models , Runoff -- Mathematical models , Wetland hydrology
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/177997 , vital:42897 , 10.21504/10962/177997
- Description: Compared to other large river basins of the world, such as the Amazon, the Congo River Basin appears to be the most ungauged and less studied. This is partly because the basin lacks sufficient observational hydro-climatic monitoring stations and appropriate information on physiographic basin properties at a spatial scale deemed for hydrological applications, making it difficult to estimate water resources at the scale of sub-basins (Chapter 3). In the same time, the basin is facing the challenges related to rapid population growth, uncontrolled urbanisation as well as climate change. Adequate quantification of hydrological processes across different spatial and temporal scales in the basin, and the drivers of change, is essential for prediction and strategic planning to ensure sustainable management of water resources in the Congo River Basin. Hydrological models are particularly important to generate the required information. However, the shortness of the available streamflow records, lack of spatial representativeness of the available streamflow gauging stations and the lack of understanding of the processes in channel-wetland exchanges, are the main challenges that constrain the use of traditional approaches to models development. They also contribute to increased uncertainty in the estimation of water resources across the basin (Chapter 1 and 2). Given this ungauged nature of the Congo River Basin, it is important to resort to hydrological modelling approaches that can reasonably quantify and model the uncertainty associated with water resources estimation (Chapter 4) to make hydrological predictions reliable. This study explores appropriate methods for hydrological predictions and water resources assessment in ungauged catchments of the Congo River Basin. In this context, the core modelling framework combines the quantification of uncertainty in constraint indices, hydrological modelling and hydrodynamic modelling. The latter accounts for channel-wetland exchanges in sub-basins where wetlands exert considerable influence on downstream flow regimes at the monthly time scale. The constraint indices are the characteristics of a sub-basin’s long-term hydrological behaviour and may reflect the dynamics of the different components of the catchment water balance such as climate, water storage and different runoff processes. Currently, six constraint indices namely the mean monthly runoff volume (MMQ in m3 *106), mean monthly groundwater recharge depth (MMR in mm), the 10th, 50th and 90th percentiles of the flow duration curve expressed as a fraction of MMQ (Q10/MMQ, Q50/MMQ, Q90/MMQ) and the percentage of time that zero flows are expected (%Zero), are used in the modelling approach. These were judged to be the minimum number of key indices that can discriminate between different hydrological responses. The constraint indices in the framework help to determine an uncertainty range within which behavioural model parameters of the expected hydrological response can be identified. Predictive equations of the constraint indices across all climate and physiographic regions of the Congo Basin were based only on the aridity index because it was the most influential sub-basin attribute (Chapter 5) for which quantitative information was available. The degree of uncertainty in the constraint Q10/MMQ and Q50/MMQ indices is less than 41%, while it is somewhat higher for the mean monthly runoff (MMQ) and Q90/MMQ constraint indices. The established uncertainty ranges of the constraint indices were tested in some selected sub-basins of the Congo Basin, including the Lualaba (93 sub-basins), Sangha (24 sub-basins), Oubangui (19 sub-basins), Batéké plateaux (4 sub-basins), Kasai (4 sub-basins) and Inkisi (3 sub-basins). The results proved useful through the application of a 2-stage uncertainty approach of the PITMAN model. However, it comes out of this study that the application of the original constraint indices ranges (Chapter 5) generated satisfactory simulation results in some areas, while in others both small and large adjustments were required to fully capture some aspects of the observed hydrological responses (Chapter 6). Part of the reason is attributed to the availability and quality of streamflow data used to develop the constraint indices ranges (Chapter 5). The main issue identified in the modelling process was whether the changes made to the original constraints at headwater-gauged sub-basins can be applied to ungauged upstream sub-basins to match the observed flow at downstream gauging stations. Ideally, only gauged sub-basin’s constraints can be easily revised based on the observed flow. However, the refinement made to gauged sub-basins alone may fail to substantially affect the results if ungauged upstream sub-basins exert a major impact on defining downstream hydrological response. The majority of gauging stations used in this analysis are located downstream of many upstream ungauged sub-basins and therefore adjustments were required in ungauged sub-basins. These adjustments consist of shifting the full range of a constraint index either towards higher or lower values, depending on the degree to which the simulated uncertainty bounds depart from the observed flow. While this modelling approach seems effective in capturing many aspects of the hydrological responses with a reduced level of uncertainty compared to a previous study, it is recommended that the approach be extended to the remaining parts of the Congo Basin and assessed under current and future development conditions including environmental changes. A 2D hydrodynamic river-wetland model (LISFLOOD-FP) has been used to explicitly represent the inundation process exchanges between river channels and wetland systems. The hydrodynamic modelling outputs are used to calibrate the PITMAN wetland sub-model parameters. The five hydrodynamic models constructed for Ankoro, Kamalondo, Kundelungu, Mweru and Tshiangalele wetland systems have been partially validated using independent estimates of inundation extents available from Landsat imagery. Other sources of data such as remote sensing of water level altimetry, SAR images and wetland storage estimates may be used to improve the validation results. However, the important objective in this study was to make sure that flow volume exchanges between river channels and their adjacent floodplains were being simulated realistically. The wetland sub-model parameters are calibrated in a spreadsheet version of the PITMAN wetland routine to achieve visual correspondence between the LISFLOOD-FP and PITMAN wetland sub-model outputs (Storage volumes and channel outputs). The hysteretic patterns of the river-wetland processes were quantified using hysteresis indices and were associated with the spill and return flow parameters of the wetland sub-model and eventually with the wetland morphometric characteristics. One example is the scale parameter of the return flow function (AA), which shows a good relationship with the average surface slope of the wetland when the coefficient parameter (BB) of the same function is kept constant to a value of 1.25. The same parameter (AA) is a good indicator of the wetland emptying mechanism. A small AA indicates a wetland that slowly releases its flow, resulting in a highly delayed and attenuated hydrological response in downstream sub-basins. This understanding has a practical advantage for the estimation of the PITMAN wetland parameters in the many areas where it is not possible, or where the resources are not available, to run complex hydrodynamic models (Chapter 7). The inclusion of these LISFLOOD-FP informed wetland parameters in the basin-scale hydrological modelling results in acceptable simulations for the lower Lualaba drainage system. The small wetlands, like Ankoro and Tshiangalele, have a negligible impact on downstream flow regimes, whereas large wetlands, such as Kamalondo and Mweru, have very large impacts. In general, the testing of the original constraint indices in the region of wetlands and further downstream of the Lualaba drainage system has shown acceptable results. However, there remains an unresolved uncertainty issue related to the under and over-estimation of some aspects of the hydrological response at both Mulongo and Ankoro, two gauging stations in the immediate downstream of the Kamalondo wetland system. It is difficult to attribute this uncertainty to Kamalondo wetland parameters alone because many of the incremental sub-basins contributing to wetland inflows are ungauged. The issue at Mulongo is the under simulation of low flow, while the high flows at the Ankoro gauging station are over-simulated. However, the pattern of the calibrated constraint indices in this region (Chapter 8) shows that the under simulation of low flow at Mulongo cannot be attributed to incremental sub-basins (between Bukama, Kapolowe and Mulongo gauging stations), because their Q90/MMQ constraint indices are even slightly above the original constraint ranges, but maintain a spatial consistency with sub-basins of other regions. Similarly, sub-basins located between Mulongo, Luvua and Ankoro gauging stations have high flow indices slightly below the original constraint ranges and therefore they are unlikely to be responsible for the over simulation of high flow at the Ankoro gauging station. These facts highlight the need for a further understanding of the complex wetland system of Kamalondo. Short-term data collection and monitoring programme are required. Important tributaries that drain to this wetland need to be monitored by installing water level loggers and periodically collecting flow data and river bathymetry. This programme should lead to the development of rating curves of wetland input tributaries. This would partially solve the unresolved uncertainty issues at the Ankoro and Mulongo gauging stations. The integrated modelling approach offers many opportunities in the Congo Basin. The quantified and modelled uncertainty helps to identify regions with high uncertainty and allows for the identification of various data collection and management strategies that can potentially contribute to the uncertainty reduction. The quantified channel-wetland exchanges contribute to the improvement of the overall knowledge of water resources estimation within the regions where the effects of wetlands are evident even at the monthly time scale. In contrast, ignoring uncertainty in the estimates of water resources availability means that water resources planning and management decisions in the Congo Basin will continue to be based on inadequate information and unquantified uncertainty, thus increasing the risk associated with water resources decision making. , Thesis (PhD) -- Faculty of Science, Institute for Water Research, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Kabuya, Pierre Mulamba
- Date: 2021-04
- Subjects: Congo River Watershed , Watersheds -- Congo (Democratic Republic) , Hydrologic models , Rain and rainfall -- Mathematical models , Runoff -- Mathematical models , Wetland hydrology
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/177997 , vital:42897 , 10.21504/10962/177997
- Description: Compared to other large river basins of the world, such as the Amazon, the Congo River Basin appears to be the most ungauged and less studied. This is partly because the basin lacks sufficient observational hydro-climatic monitoring stations and appropriate information on physiographic basin properties at a spatial scale deemed for hydrological applications, making it difficult to estimate water resources at the scale of sub-basins (Chapter 3). In the same time, the basin is facing the challenges related to rapid population growth, uncontrolled urbanisation as well as climate change. Adequate quantification of hydrological processes across different spatial and temporal scales in the basin, and the drivers of change, is essential for prediction and strategic planning to ensure sustainable management of water resources in the Congo River Basin. Hydrological models are particularly important to generate the required information. However, the shortness of the available streamflow records, lack of spatial representativeness of the available streamflow gauging stations and the lack of understanding of the processes in channel-wetland exchanges, are the main challenges that constrain the use of traditional approaches to models development. They also contribute to increased uncertainty in the estimation of water resources across the basin (Chapter 1 and 2). Given this ungauged nature of the Congo River Basin, it is important to resort to hydrological modelling approaches that can reasonably quantify and model the uncertainty associated with water resources estimation (Chapter 4) to make hydrological predictions reliable. This study explores appropriate methods for hydrological predictions and water resources assessment in ungauged catchments of the Congo River Basin. In this context, the core modelling framework combines the quantification of uncertainty in constraint indices, hydrological modelling and hydrodynamic modelling. The latter accounts for channel-wetland exchanges in sub-basins where wetlands exert considerable influence on downstream flow regimes at the monthly time scale. The constraint indices are the characteristics of a sub-basin’s long-term hydrological behaviour and may reflect the dynamics of the different components of the catchment water balance such as climate, water storage and different runoff processes. Currently, six constraint indices namely the mean monthly runoff volume (MMQ in m3 *106), mean monthly groundwater recharge depth (MMR in mm), the 10th, 50th and 90th percentiles of the flow duration curve expressed as a fraction of MMQ (Q10/MMQ, Q50/MMQ, Q90/MMQ) and the percentage of time that zero flows are expected (%Zero), are used in the modelling approach. These were judged to be the minimum number of key indices that can discriminate between different hydrological responses. The constraint indices in the framework help to determine an uncertainty range within which behavioural model parameters of the expected hydrological response can be identified. Predictive equations of the constraint indices across all climate and physiographic regions of the Congo Basin were based only on the aridity index because it was the most influential sub-basin attribute (Chapter 5) for which quantitative information was available. The degree of uncertainty in the constraint Q10/MMQ and Q50/MMQ indices is less than 41%, while it is somewhat higher for the mean monthly runoff (MMQ) and Q90/MMQ constraint indices. The established uncertainty ranges of the constraint indices were tested in some selected sub-basins of the Congo Basin, including the Lualaba (93 sub-basins), Sangha (24 sub-basins), Oubangui (19 sub-basins), Batéké plateaux (4 sub-basins), Kasai (4 sub-basins) and Inkisi (3 sub-basins). The results proved useful through the application of a 2-stage uncertainty approach of the PITMAN model. However, it comes out of this study that the application of the original constraint indices ranges (Chapter 5) generated satisfactory simulation results in some areas, while in others both small and large adjustments were required to fully capture some aspects of the observed hydrological responses (Chapter 6). Part of the reason is attributed to the availability and quality of streamflow data used to develop the constraint indices ranges (Chapter 5). The main issue identified in the modelling process was whether the changes made to the original constraints at headwater-gauged sub-basins can be applied to ungauged upstream sub-basins to match the observed flow at downstream gauging stations. Ideally, only gauged sub-basin’s constraints can be easily revised based on the observed flow. However, the refinement made to gauged sub-basins alone may fail to substantially affect the results if ungauged upstream sub-basins exert a major impact on defining downstream hydrological response. The majority of gauging stations used in this analysis are located downstream of many upstream ungauged sub-basins and therefore adjustments were required in ungauged sub-basins. These adjustments consist of shifting the full range of a constraint index either towards higher or lower values, depending on the degree to which the simulated uncertainty bounds depart from the observed flow. While this modelling approach seems effective in capturing many aspects of the hydrological responses with a reduced level of uncertainty compared to a previous study, it is recommended that the approach be extended to the remaining parts of the Congo Basin and assessed under current and future development conditions including environmental changes. A 2D hydrodynamic river-wetland model (LISFLOOD-FP) has been used to explicitly represent the inundation process exchanges between river channels and wetland systems. The hydrodynamic modelling outputs are used to calibrate the PITMAN wetland sub-model parameters. The five hydrodynamic models constructed for Ankoro, Kamalondo, Kundelungu, Mweru and Tshiangalele wetland systems have been partially validated using independent estimates of inundation extents available from Landsat imagery. Other sources of data such as remote sensing of water level altimetry, SAR images and wetland storage estimates may be used to improve the validation results. However, the important objective in this study was to make sure that flow volume exchanges between river channels and their adjacent floodplains were being simulated realistically. The wetland sub-model parameters are calibrated in a spreadsheet version of the PITMAN wetland routine to achieve visual correspondence between the LISFLOOD-FP and PITMAN wetland sub-model outputs (Storage volumes and channel outputs). The hysteretic patterns of the river-wetland processes were quantified using hysteresis indices and were associated with the spill and return flow parameters of the wetland sub-model and eventually with the wetland morphometric characteristics. One example is the scale parameter of the return flow function (AA), which shows a good relationship with the average surface slope of the wetland when the coefficient parameter (BB) of the same function is kept constant to a value of 1.25. The same parameter (AA) is a good indicator of the wetland emptying mechanism. A small AA indicates a wetland that slowly releases its flow, resulting in a highly delayed and attenuated hydrological response in downstream sub-basins. This understanding has a practical advantage for the estimation of the PITMAN wetland parameters in the many areas where it is not possible, or where the resources are not available, to run complex hydrodynamic models (Chapter 7). The inclusion of these LISFLOOD-FP informed wetland parameters in the basin-scale hydrological modelling results in acceptable simulations for the lower Lualaba drainage system. The small wetlands, like Ankoro and Tshiangalele, have a negligible impact on downstream flow regimes, whereas large wetlands, such as Kamalondo and Mweru, have very large impacts. In general, the testing of the original constraint indices in the region of wetlands and further downstream of the Lualaba drainage system has shown acceptable results. However, there remains an unresolved uncertainty issue related to the under and over-estimation of some aspects of the hydrological response at both Mulongo and Ankoro, two gauging stations in the immediate downstream of the Kamalondo wetland system. It is difficult to attribute this uncertainty to Kamalondo wetland parameters alone because many of the incremental sub-basins contributing to wetland inflows are ungauged. The issue at Mulongo is the under simulation of low flow, while the high flows at the Ankoro gauging station are over-simulated. However, the pattern of the calibrated constraint indices in this region (Chapter 8) shows that the under simulation of low flow at Mulongo cannot be attributed to incremental sub-basins (between Bukama, Kapolowe and Mulongo gauging stations), because their Q90/MMQ constraint indices are even slightly above the original constraint ranges, but maintain a spatial consistency with sub-basins of other regions. Similarly, sub-basins located between Mulongo, Luvua and Ankoro gauging stations have high flow indices slightly below the original constraint ranges and therefore they are unlikely to be responsible for the over simulation of high flow at the Ankoro gauging station. These facts highlight the need for a further understanding of the complex wetland system of Kamalondo. Short-term data collection and monitoring programme are required. Important tributaries that drain to this wetland need to be monitored by installing water level loggers and periodically collecting flow data and river bathymetry. This programme should lead to the development of rating curves of wetland input tributaries. This would partially solve the unresolved uncertainty issues at the Ankoro and Mulongo gauging stations. The integrated modelling approach offers many opportunities in the Congo Basin. The quantified and modelled uncertainty helps to identify regions with high uncertainty and allows for the identification of various data collection and management strategies that can potentially contribute to the uncertainty reduction. The quantified channel-wetland exchanges contribute to the improvement of the overall knowledge of water resources estimation within the regions where the effects of wetlands are evident even at the monthly time scale. In contrast, ignoring uncertainty in the estimates of water resources availability means that water resources planning and management decisions in the Congo Basin will continue to be based on inadequate information and unquantified uncertainty, thus increasing the risk associated with water resources decision making. , Thesis (PhD) -- Faculty of Science, Institute for Water Research, 2021
- Full Text:
- Date Issued: 2021-04
Hierdie keer gaan nie maklik wees nie
- Authors: Visser, Deon Claudius
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , Diaries -- Authorship , Short stories, Afrikaans -- 21st century , Afrikaans fiction -- 21st century , Afrikaans fiction -- History and criticism
- Language: Afrikaans
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178317 , vital:42929
- Description: My tesis bestaan uit twee versamelings van prosa wat verwant en in noue verband met mekaar tree. Die prosa is fragmentaries en kort maar verbind met ‟n oorkoepelende storie wat in beide Afrikaans en Engels voorgelê word. Die Afrikaanse deel van my tesis ondersoek die verlede, en die Engels die toekoms. My algemene bron van inspirasie vir die struktuur en voorlegging van die tesis word verkry vanaf die klassieke raamverteller konvensie soos gebruik in One Thousand and One Nights, hierdie konvensie maak gebruik van raamfragmente wat binne ‟n groter geheel gevind kan word. Dit is juis hierdie komplekse struktuur wat dit moontlik maak om tyd, hede en verlede asook die toekoms, te kan ondersoek en uit te beeld. Verder maak dit dit ook moontlik om gekoppelde herinneringe, gedagteneigings, en fantasieverhale te kan gebruik as die dryfkrag van die oorkoepelende storie. Met betrekking tot kontemporêre fiksie vind ek die meeste aanklank en invloed by Sandra Cisneros se boek House on Mango Street. Ek het by hierdie verhaal geleer hoe om vignette en kortverhale onafhanklik maar met ‟n motief-verbinding aan mekaar te koppel. Tematies gesproke handel my tesis oor herinneringe, nostalgie, familieverhoudings, die dood asook afsluiting en aanbeweging. In terme van hierdie temas vind ek dat Nathan Trantraal se Chokers en Survivors, en Noudat Slapende Honde deur Ronelda S. Kamfer my die meeste insae gee oor die verhouding tussen Afrikaans en Engels in die literatuur. Verder is Loftus Marais se taalgebruik en die vermenging van taal in Staan in die Algemeen Nader aan Vensters ook insiggewend. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Visser, Deon Claudius
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , Diaries -- Authorship , Short stories, Afrikaans -- 21st century , Afrikaans fiction -- 21st century , Afrikaans fiction -- History and criticism
- Language: Afrikaans
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178317 , vital:42929
- Description: My tesis bestaan uit twee versamelings van prosa wat verwant en in noue verband met mekaar tree. Die prosa is fragmentaries en kort maar verbind met ‟n oorkoepelende storie wat in beide Afrikaans en Engels voorgelê word. Die Afrikaanse deel van my tesis ondersoek die verlede, en die Engels die toekoms. My algemene bron van inspirasie vir die struktuur en voorlegging van die tesis word verkry vanaf die klassieke raamverteller konvensie soos gebruik in One Thousand and One Nights, hierdie konvensie maak gebruik van raamfragmente wat binne ‟n groter geheel gevind kan word. Dit is juis hierdie komplekse struktuur wat dit moontlik maak om tyd, hede en verlede asook die toekoms, te kan ondersoek en uit te beeld. Verder maak dit dit ook moontlik om gekoppelde herinneringe, gedagteneigings, en fantasieverhale te kan gebruik as die dryfkrag van die oorkoepelende storie. Met betrekking tot kontemporêre fiksie vind ek die meeste aanklank en invloed by Sandra Cisneros se boek House on Mango Street. Ek het by hierdie verhaal geleer hoe om vignette en kortverhale onafhanklik maar met ‟n motief-verbinding aan mekaar te koppel. Tematies gesproke handel my tesis oor herinneringe, nostalgie, familieverhoudings, die dood asook afsluiting en aanbeweging. In terme van hierdie temas vind ek dat Nathan Trantraal se Chokers en Survivors, en Noudat Slapende Honde deur Ronelda S. Kamfer my die meeste insae gee oor die verhouding tussen Afrikaans en Engels in die literatuur. Verder is Loftus Marais se taalgebruik en die vermenging van taal in Staan in die Algemeen Nader aan Vensters ook insiggewend. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-04
In My Flesh : Fabricating the Bulimic Body
- Authors: Hodgson, Ashley
- Date: 2021-04
- Subjects: Bulimia , Human body -- Social aspects , Human figure in art , Diseases in art , Art therapy
- Language: English
- Type: thesis , text , Masters , MFA
- Identifier: http://hdl.handle.net/10962/177317 , vital:42809
- Description: My MFA exhibition In My Flesh, explores my own personal experience of an eating disorder: bulimia nervosa, through the medium of sculpture and installation. Situated in the Fine Art Sculpture and Painting building on Rhodes University campus, this practical submission takes the form of a multi-sensory installation depicting the fleshy interior of a bulimic body. The sculptural works that make up the installation resemble enlarged bodily forms and cavities, namely the mouth; the oesophagus, the stomach; the intestines; and the flesh. These anatomical forms are made from fabric which has been melted, manipulated, and stained using food and other synthetic dyes. The arrangement of the sculptural components (parts of the body affected by bulimia) does not mirror the human body exactly, and their intentionally disordered placement creates a feeling of dis-ease and disturbance for the participant experiencing the installation. This mini-thesis, In My Flesh: Fabricating the Bulimic Body, unpacks the visual, tactile and audio elements of this practice as research submission as they relate to my interest in bodily boundaries, corporeal traces and material extensions. I look at these themes as they translate into installation, and discuss the way in which bulimia is experienced, theorised and represented. I position my work in relation to the concept of the abject as proposed by Julia Kristeva, and visually analyse artworks by Mona Hatoum, Heidi Bucher and Ernesto Neto who make use of immersive installation strategies that resonate with my own practice. This supporting document considers the three conceptual elements informing my installation: embodiment, space, and materiality. In the first chapter of this document: Embodying the Bulimic Body, I address bulimia as less open to visual interpretations than other eating disorders because of its secretive and hidden nature. I go on to frame the illness in relation to theories around bodily boundaries and abjection and argue that bulimia epitomises abjection. In Chapter Two: Architecture of the Bulimic Body I engage with the idea of architectural structures as having anatomic features. I interrogate how the body moves through space, leaving traces of itself behind. Chapter Three: Fabricating the Bulimic Body concentrates on the main medium used in In My Flesh: fabric. In my discussion of this material, I unpack its metaphoric and symbolic qualities, as well as its personal resonance with my own lived experience. , Thesis (MFA) -- Faculty of Humanities, Fine Art, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Hodgson, Ashley
- Date: 2021-04
- Subjects: Bulimia , Human body -- Social aspects , Human figure in art , Diseases in art , Art therapy
- Language: English
- Type: thesis , text , Masters , MFA
- Identifier: http://hdl.handle.net/10962/177317 , vital:42809
- Description: My MFA exhibition In My Flesh, explores my own personal experience of an eating disorder: bulimia nervosa, through the medium of sculpture and installation. Situated in the Fine Art Sculpture and Painting building on Rhodes University campus, this practical submission takes the form of a multi-sensory installation depicting the fleshy interior of a bulimic body. The sculptural works that make up the installation resemble enlarged bodily forms and cavities, namely the mouth; the oesophagus, the stomach; the intestines; and the flesh. These anatomical forms are made from fabric which has been melted, manipulated, and stained using food and other synthetic dyes. The arrangement of the sculptural components (parts of the body affected by bulimia) does not mirror the human body exactly, and their intentionally disordered placement creates a feeling of dis-ease and disturbance for the participant experiencing the installation. This mini-thesis, In My Flesh: Fabricating the Bulimic Body, unpacks the visual, tactile and audio elements of this practice as research submission as they relate to my interest in bodily boundaries, corporeal traces and material extensions. I look at these themes as they translate into installation, and discuss the way in which bulimia is experienced, theorised and represented. I position my work in relation to the concept of the abject as proposed by Julia Kristeva, and visually analyse artworks by Mona Hatoum, Heidi Bucher and Ernesto Neto who make use of immersive installation strategies that resonate with my own practice. This supporting document considers the three conceptual elements informing my installation: embodiment, space, and materiality. In the first chapter of this document: Embodying the Bulimic Body, I address bulimia as less open to visual interpretations than other eating disorders because of its secretive and hidden nature. I go on to frame the illness in relation to theories around bodily boundaries and abjection and argue that bulimia epitomises abjection. In Chapter Two: Architecture of the Bulimic Body I engage with the idea of architectural structures as having anatomic features. I interrogate how the body moves through space, leaving traces of itself behind. Chapter Three: Fabricating the Bulimic Body concentrates on the main medium used in In My Flesh: fabric. In my discussion of this material, I unpack its metaphoric and symbolic qualities, as well as its personal resonance with my own lived experience. , Thesis (MFA) -- Faculty of Humanities, Fine Art, 2021
- Full Text:
- Date Issued: 2021-04
Indigenous knowledge of ecosystem services in rural communities of the Eastern Cape, South Africa
- Authors: Murata, Chenai
- Date: 2021-04
- Subjects: Ethnoscience -- South Africa -- Eastern Cape , Ecosystem management -- South Africa -- Eastern Cape , Nature -- Effect of human beings on -- South Africa -- Eastern Cape , Human ecology -- South Africa -- Eastern Cape , Human beings -- Effect of environment on -- South Africa -- Eastern Cape , South Africa -- Eastern Cape -- Rural conditions
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/177929 , vital:42891 , 10.21504/10962/177929
- Description: This thesis is on indigenous knowledge of ecosystem services. The ecosystem service framework and its associated concepts are fairly young, having been introduced in the ecological discipline in the 1980s. The ecosystem service framework posits that the wellbeing of humans and their communities is dependent on services supplied by ecosystems. It emphasises that for the ecosystems to be able to supply the services, they need to be in a well-functioning state. This idea of well-functioning is predicated on the argument that the ecosystem service framework enjoins resource users to exercise responsible stewardship to prevent degradation and overharvesting. Moreover, the concept of dependence suggests that ecosystem services are of value to humans. The dominant means of measuring the value of ecosystem services has been the economic valuation method in which the contribution that each service makes to human wellbeing is quantified into monetary units. The framework disaggregates the services into four groups, namely provisioning, cultural, supporting and regulatory and seeks to all the pillars of human wellbeing including health, subsistence and spirituality into each of these groups. In doing all this, the framework significantly reconfigures the way we look at and present human-nature relations. This change has the potential to influence significant shifts in how ecological research and intervention programmes are conducted in the foreseeable future. However, the reality that the ecosystem service framework was formulated within, and is informed by the scientific epistemology begs the question: what do traditional rural communities who depend mainly on indigenous knowledge systems (IKS) for shaping and interoperating their relations with nature know of the ecosystem service concept? Rural communities are the ones who interact directly with nature on a day-to-day basis. This makes them a very critical component in the ecosystem service framework. Although South Africa has had studies in the ecosystem service theme, little has been done to attempt to investigate and document indigenous knowledge of ecosystem services that rural communities possess. By focusing only on scientific knowledge of ecosystem services, the South African literature does not do justice to the plural epistemologies of the ecosystem service users in the country. More importantly, the continued dearth of public information on indigenous knowledge of ecosystem services can potentially obstruct implementation of locally sensitive intervention programmes because nothing is known about how the local communities conceptualise the ecosystem service framework. All this presents a crucial gap in the South African research; one that unless effort is made to contribute towards filling it, our knowledge of how communities experience the ecosystem service framework in South Africa will remain skewed. This study set out to investigate and document indigenous knowledge of ecosystem services in order to contribute towards filling this gap. Indigenous knowledge system is an umbrella epistemic system that includes lay ecological knowledge (LEK), traditional ecological knowledge (TEK) and many other related organized systems of knowing. Although the thesis has a chapter on LEK, its primary focus was TEK because the thesis was interested in unravelling how aspects of tradition including taboos, customs, traditional rules and belief in ancestral forces influence local communities’ knowledge of some key aspects of the ecosystem service framework including knowledge of various ecosystem services, valuation of ecosystem services, management of ecosystem services and perceptions of the management practices. The decision to focus on TEK was based on the reasoning that rural communities of the Eastern Cape boast a strong reputation of being traditional, recognizing ancestral spirits, legends and taboos as critical tools of knowledge generation and transmission. Using both mixed methods in some chapters and the qualitative approach alone in others, the study collected data in five villages of Mgwalana, Mahlungulu, Colana, Gogela and Nozitshena located in the north eastern part of Eastern Cape Province of South Africa, a region formerly called Transkei. The data were collected not on ecosystem services; but on the local people’s knowledge of ecosystem services. Although literature was consulted, the study regarded respondents as the primary source of data, hence the findings and conclusions presented in this thesis are about what local people know about ecosystem services. The study uses critical realist theoretical lenses to interpret respondents’ reports. The lenses included the principle of the separation between ontology and epistemology, the iceberg metaphor of ontology, epistemological pluralism and the hermeneutic dimension. These lenses were used to make sense of both the knowledge system of local people and the things about which their knowledge was. As part of discussing the local people’s knowledge, the study sometimes refers to science. This is not because I expected them to demonstrate knowledge similar to science. Instead, it was a critical realist dialectical way of explaining what something is by demonstrating what it is not. The study made a couple of key findings that can potentially enhance the growth of the South African ecosystem service discipline. First, respondents demonstrated knowledge of ecosystem services by mentioning a range of them such as drinking water, medicinal plants, cultural plants and fuelwood and how they affect the wellbeing of humans. However, what they did not have good knowledge of is that nature services can be classified into the four groups of supporting, regulatory, cultural and provisioning. Among the four ecosystem services groups, respondents could identify two only; provisional and cultural. Second, local communities depend heavily on ecosystem services for their well-being. The services include fuelwood, construction timber, medicinal plants, wild fruits, wild fish, cultural services and thatch grass. Although they appreciate that ecosystem services have value to their wellbeing, local people found it difficult to represent the value in monetary units. The conditions that make it difficult for local people to perceive ecosystem services as commodities include the absence of well-defined property system, lack of a quantitative consumer tradition and absence of an economic conception of nature. Third, local people understand the need to keep ecosystems in a well-functioning state hence they implement several traditional practices to manage ecosystem services. These practices include taboos, designating certain resources as sacred, legends, customary law, as well as some secular practices including gelesha and stone terracing. However, it is not easy to understand how traditional management practices work because they are not empirically observable. Fourth, local people possess knowledge of the reality that if not well managed, ecosystems can undergo degradation and hence fail to supply the services needed for human wellbeing. However, they explain the causes of degradation in terms of changes observable at the empirical level and the invisible causal power of supernatural forces. The inclusion of natural forces in degradation explanations marks a departure from the scientific explanations that revolve around biophysical processes. Fifth, the use of traditional management practices such as taboos to management ecosystems is under threat at the local communities. The threat can be attributed to three groups of causes, namely changes in worldviews due to adoption of formal education and Christianity, institutional disharmony playing out between the state and local traditional leadership, and lifestyle changes. These challenges constrain the opportunity for local people to apply traditional management practices to prevent the degradation of ecosystems. The net implication of this is that it renders it difficult for researchers and policy makers to assess the effectiveness of traditional management practices because they are not being implemented in full. In light of all these findings, the thesis concludes that TEK is underlabouring for the ecosystem service framework in the sense that it is used by local communities to generate knowledge of ecological concepts and phenomena. This means that TEK does not exist for the sake of its own self. Drawing from this finding, the study proposes a framework of analysing TEK as an underlabourer for social-ecological triggers or issues. Nonetheless, there are few factors that can be sources of limitation to the study. These include the reality that it was difficult to access pure traditional knowledge because over the years the local communities have received many state-sponsored ecological intervention programmes and a possible personal bias given the reality that I grew up in a traditional household and my father was a key holder or TEK. , Thesis (PhD) -- Faculty of Science, Environmental Science, 2021 , Thesis chapter to be published in 'Green and Low-Carbon Economy'. Journal available: https://ojs.bonviewpress.com/index.php/GLCE/index
- Full Text:
- Date Issued: 2021-04
- Authors: Murata, Chenai
- Date: 2021-04
- Subjects: Ethnoscience -- South Africa -- Eastern Cape , Ecosystem management -- South Africa -- Eastern Cape , Nature -- Effect of human beings on -- South Africa -- Eastern Cape , Human ecology -- South Africa -- Eastern Cape , Human beings -- Effect of environment on -- South Africa -- Eastern Cape , South Africa -- Eastern Cape -- Rural conditions
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/177929 , vital:42891 , 10.21504/10962/177929
- Description: This thesis is on indigenous knowledge of ecosystem services. The ecosystem service framework and its associated concepts are fairly young, having been introduced in the ecological discipline in the 1980s. The ecosystem service framework posits that the wellbeing of humans and their communities is dependent on services supplied by ecosystems. It emphasises that for the ecosystems to be able to supply the services, they need to be in a well-functioning state. This idea of well-functioning is predicated on the argument that the ecosystem service framework enjoins resource users to exercise responsible stewardship to prevent degradation and overharvesting. Moreover, the concept of dependence suggests that ecosystem services are of value to humans. The dominant means of measuring the value of ecosystem services has been the economic valuation method in which the contribution that each service makes to human wellbeing is quantified into monetary units. The framework disaggregates the services into four groups, namely provisioning, cultural, supporting and regulatory and seeks to all the pillars of human wellbeing including health, subsistence and spirituality into each of these groups. In doing all this, the framework significantly reconfigures the way we look at and present human-nature relations. This change has the potential to influence significant shifts in how ecological research and intervention programmes are conducted in the foreseeable future. However, the reality that the ecosystem service framework was formulated within, and is informed by the scientific epistemology begs the question: what do traditional rural communities who depend mainly on indigenous knowledge systems (IKS) for shaping and interoperating their relations with nature know of the ecosystem service concept? Rural communities are the ones who interact directly with nature on a day-to-day basis. This makes them a very critical component in the ecosystem service framework. Although South Africa has had studies in the ecosystem service theme, little has been done to attempt to investigate and document indigenous knowledge of ecosystem services that rural communities possess. By focusing only on scientific knowledge of ecosystem services, the South African literature does not do justice to the plural epistemologies of the ecosystem service users in the country. More importantly, the continued dearth of public information on indigenous knowledge of ecosystem services can potentially obstruct implementation of locally sensitive intervention programmes because nothing is known about how the local communities conceptualise the ecosystem service framework. All this presents a crucial gap in the South African research; one that unless effort is made to contribute towards filling it, our knowledge of how communities experience the ecosystem service framework in South Africa will remain skewed. This study set out to investigate and document indigenous knowledge of ecosystem services in order to contribute towards filling this gap. Indigenous knowledge system is an umbrella epistemic system that includes lay ecological knowledge (LEK), traditional ecological knowledge (TEK) and many other related organized systems of knowing. Although the thesis has a chapter on LEK, its primary focus was TEK because the thesis was interested in unravelling how aspects of tradition including taboos, customs, traditional rules and belief in ancestral forces influence local communities’ knowledge of some key aspects of the ecosystem service framework including knowledge of various ecosystem services, valuation of ecosystem services, management of ecosystem services and perceptions of the management practices. The decision to focus on TEK was based on the reasoning that rural communities of the Eastern Cape boast a strong reputation of being traditional, recognizing ancestral spirits, legends and taboos as critical tools of knowledge generation and transmission. Using both mixed methods in some chapters and the qualitative approach alone in others, the study collected data in five villages of Mgwalana, Mahlungulu, Colana, Gogela and Nozitshena located in the north eastern part of Eastern Cape Province of South Africa, a region formerly called Transkei. The data were collected not on ecosystem services; but on the local people’s knowledge of ecosystem services. Although literature was consulted, the study regarded respondents as the primary source of data, hence the findings and conclusions presented in this thesis are about what local people know about ecosystem services. The study uses critical realist theoretical lenses to interpret respondents’ reports. The lenses included the principle of the separation between ontology and epistemology, the iceberg metaphor of ontology, epistemological pluralism and the hermeneutic dimension. These lenses were used to make sense of both the knowledge system of local people and the things about which their knowledge was. As part of discussing the local people’s knowledge, the study sometimes refers to science. This is not because I expected them to demonstrate knowledge similar to science. Instead, it was a critical realist dialectical way of explaining what something is by demonstrating what it is not. The study made a couple of key findings that can potentially enhance the growth of the South African ecosystem service discipline. First, respondents demonstrated knowledge of ecosystem services by mentioning a range of them such as drinking water, medicinal plants, cultural plants and fuelwood and how they affect the wellbeing of humans. However, what they did not have good knowledge of is that nature services can be classified into the four groups of supporting, regulatory, cultural and provisioning. Among the four ecosystem services groups, respondents could identify two only; provisional and cultural. Second, local communities depend heavily on ecosystem services for their well-being. The services include fuelwood, construction timber, medicinal plants, wild fruits, wild fish, cultural services and thatch grass. Although they appreciate that ecosystem services have value to their wellbeing, local people found it difficult to represent the value in monetary units. The conditions that make it difficult for local people to perceive ecosystem services as commodities include the absence of well-defined property system, lack of a quantitative consumer tradition and absence of an economic conception of nature. Third, local people understand the need to keep ecosystems in a well-functioning state hence they implement several traditional practices to manage ecosystem services. These practices include taboos, designating certain resources as sacred, legends, customary law, as well as some secular practices including gelesha and stone terracing. However, it is not easy to understand how traditional management practices work because they are not empirically observable. Fourth, local people possess knowledge of the reality that if not well managed, ecosystems can undergo degradation and hence fail to supply the services needed for human wellbeing. However, they explain the causes of degradation in terms of changes observable at the empirical level and the invisible causal power of supernatural forces. The inclusion of natural forces in degradation explanations marks a departure from the scientific explanations that revolve around biophysical processes. Fifth, the use of traditional management practices such as taboos to management ecosystems is under threat at the local communities. The threat can be attributed to three groups of causes, namely changes in worldviews due to adoption of formal education and Christianity, institutional disharmony playing out between the state and local traditional leadership, and lifestyle changes. These challenges constrain the opportunity for local people to apply traditional management practices to prevent the degradation of ecosystems. The net implication of this is that it renders it difficult for researchers and policy makers to assess the effectiveness of traditional management practices because they are not being implemented in full. In light of all these findings, the thesis concludes that TEK is underlabouring for the ecosystem service framework in the sense that it is used by local communities to generate knowledge of ecological concepts and phenomena. This means that TEK does not exist for the sake of its own self. Drawing from this finding, the study proposes a framework of analysing TEK as an underlabourer for social-ecological triggers or issues. Nonetheless, there are few factors that can be sources of limitation to the study. These include the reality that it was difficult to access pure traditional knowledge because over the years the local communities have received many state-sponsored ecological intervention programmes and a possible personal bias given the reality that I grew up in a traditional household and my father was a key holder or TEK. , Thesis (PhD) -- Faculty of Science, Environmental Science, 2021 , Thesis chapter to be published in 'Green and Low-Carbon Economy'. Journal available: https://ojs.bonviewpress.com/index.php/GLCE/index
- Full Text:
- Date Issued: 2021-04
Larval fish dynamics within the coastal nearshore of the Eastern Cape, South Africa
- Authors: Sotshongaye, Oko
- Date: 2021-04
- Subjects: Fishes -- Larvae -- South Africa -- Eastern Cape , Fishes -- Larvae -- Development -- South Africa -- Eastern Cape , Fishes -- Larvae -- Ecology -- South Africa -- Eastern Cape , Coastal ecology -- South Africa -- Eastern Cape , Fishes -- Larvae -- Dispersal -- South Africa -- Eastern Cape
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/176977 , vital:42776
- Description: The coastal nearshore is important for the early development of fishes as it is used for spawning and/or as a nursery. One of the central concerns in coastal ecology is understanding the role of the nearshore for larvae, ultimately providing key knowledge on population dynamics and hence helping in making decisions pertaining to conservation and resource management. The aim of this study was to investigate the alongshore and cross-shore distribution of larval fishes and the links to the physio-chemical conditions (including prevailing winds) and hydrodynamics in the region of Algoa Bay, situated on the south east coast in the warm temperate region of South Africa. Fish larvae were sampled at nine sites for the first component of the study (January 2016 –March 2017) and at four sites for the second component (November 2019), near the surface and bottom (15-50 m) of the water column as well as at two different distances from shore (~400 m/~3 km) using a set of bongo plankton nets towed behind a boat. Environmental data were simultaneously collected using and acoustic Doppler current profiler (ADCP) and conductivity, temperature, depth (CTD) profiler. Larval fish abundance generally decreased with increasing distance from the shore, however, this varied in space and time, with some larval species recorded in high abundances offshore. Close inshore the larvae of coastal fish species producing benthic eggs (CBE) including the Blenniidae and Gobiesocidae mostly dominated, while offshore the larvae of coastal fish species producing pelagic eggs (CPE) i.e. Sparidae and Cynoglossidae, as well as pelagic fish species producing pelagic eggs (PPE) i.e. Clupeidae and Engraulidae mostly dominated. Vertical distribution of larvae differed according to taxon, with the Callionymidae (CPE), Cynoglossidae and Gobiesocidae occurring at high densities at the bottom of the water column, while the Blenniidae dominated near the surface. Fluorescence, temperature and salinity varied with depth (surface/bottom), being particularly high at the surface; currents moved faster at the surface than the bottom of the water column. Increased abundances of larval fishes were evident after upwelling events (associated with easterly winds) in the Bay, while during downwelling (associated with westerly winds), low densities were generally recorded, except for the sites situated near headlands/capes where there were higher densities of fish larvae during downwelling events. Overall, the results of this study suggest that spawning mode of the adults, oceanography and environmental conditions coupled with what is known of the behaviour of fish larvae, were important in shaping the larval fish community of the Algoa Bay region. These results highlight the importance of incorporating multiple biological (developmental stage, reproductive mode, species) and physical (currents, fluorescence, wind-driven up/down-welling) factors when addressing the mechanims of transport of larval fish in the coastal nearshore. , Thesis (MSc) -- Faculty of Science, Department of Zoology and Entomology, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Sotshongaye, Oko
- Date: 2021-04
- Subjects: Fishes -- Larvae -- South Africa -- Eastern Cape , Fishes -- Larvae -- Development -- South Africa -- Eastern Cape , Fishes -- Larvae -- Ecology -- South Africa -- Eastern Cape , Coastal ecology -- South Africa -- Eastern Cape , Fishes -- Larvae -- Dispersal -- South Africa -- Eastern Cape
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/176977 , vital:42776
- Description: The coastal nearshore is important for the early development of fishes as it is used for spawning and/or as a nursery. One of the central concerns in coastal ecology is understanding the role of the nearshore for larvae, ultimately providing key knowledge on population dynamics and hence helping in making decisions pertaining to conservation and resource management. The aim of this study was to investigate the alongshore and cross-shore distribution of larval fishes and the links to the physio-chemical conditions (including prevailing winds) and hydrodynamics in the region of Algoa Bay, situated on the south east coast in the warm temperate region of South Africa. Fish larvae were sampled at nine sites for the first component of the study (January 2016 –March 2017) and at four sites for the second component (November 2019), near the surface and bottom (15-50 m) of the water column as well as at two different distances from shore (~400 m/~3 km) using a set of bongo plankton nets towed behind a boat. Environmental data were simultaneously collected using and acoustic Doppler current profiler (ADCP) and conductivity, temperature, depth (CTD) profiler. Larval fish abundance generally decreased with increasing distance from the shore, however, this varied in space and time, with some larval species recorded in high abundances offshore. Close inshore the larvae of coastal fish species producing benthic eggs (CBE) including the Blenniidae and Gobiesocidae mostly dominated, while offshore the larvae of coastal fish species producing pelagic eggs (CPE) i.e. Sparidae and Cynoglossidae, as well as pelagic fish species producing pelagic eggs (PPE) i.e. Clupeidae and Engraulidae mostly dominated. Vertical distribution of larvae differed according to taxon, with the Callionymidae (CPE), Cynoglossidae and Gobiesocidae occurring at high densities at the bottom of the water column, while the Blenniidae dominated near the surface. Fluorescence, temperature and salinity varied with depth (surface/bottom), being particularly high at the surface; currents moved faster at the surface than the bottom of the water column. Increased abundances of larval fishes were evident after upwelling events (associated with easterly winds) in the Bay, while during downwelling (associated with westerly winds), low densities were generally recorded, except for the sites situated near headlands/capes where there were higher densities of fish larvae during downwelling events. Overall, the results of this study suggest that spawning mode of the adults, oceanography and environmental conditions coupled with what is known of the behaviour of fish larvae, were important in shaping the larval fish community of the Algoa Bay region. These results highlight the importance of incorporating multiple biological (developmental stage, reproductive mode, species) and physical (currents, fluorescence, wind-driven up/down-welling) factors when addressing the mechanims of transport of larval fish in the coastal nearshore. , Thesis (MSc) -- Faculty of Science, Department of Zoology and Entomology, 2021
- Full Text:
- Date Issued: 2021-04
Salt in my footsteps
- Authors: Radebe, Mxolisi Vusumuzi
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , South African poetry (English) -- 21st century , South African fiction (English) -- 21st century
- Language: English
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178201 , vital:42920
- Description: My thesis is a collection of poems which focus on human experiences related to my background. I grew up in a countryside village, freely experiencing nature in unrestricted walks to the rivers and mountains; communal living instilled in me the humanitarian values which I uphold to the present. I use short and long lyrical prose poems to bring life and humanise the untold or unexpressed stories of my community. My use of simple everyday language and clear, concrete but surprising images that resonate with deeper meanings and emotions is influenced by Seitlhamo Motsapi’s poems, especially his collection of poems titled earthstepper/the ocean is very shallow and Mxolisi Nyezwa’s poetry book, Song Trials. Spanish poems in English translations by the 20th century Spanish poets: Blas de Otero, Juan Roman Jimenez and Federico Garcia Lorca, published in the book titled Roots and Wings have had a huge impact on my construction of images. I also draw from the free-form and narrative prose poetry experiments of poets: Mangaliso Buzani, vangile gantsho and Ivy Alvarez. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Radebe, Mxolisi Vusumuzi
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , South African poetry (English) -- 21st century , South African fiction (English) -- 21st century
- Language: English
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178201 , vital:42920
- Description: My thesis is a collection of poems which focus on human experiences related to my background. I grew up in a countryside village, freely experiencing nature in unrestricted walks to the rivers and mountains; communal living instilled in me the humanitarian values which I uphold to the present. I use short and long lyrical prose poems to bring life and humanise the untold or unexpressed stories of my community. My use of simple everyday language and clear, concrete but surprising images that resonate with deeper meanings and emotions is influenced by Seitlhamo Motsapi’s poems, especially his collection of poems titled earthstepper/the ocean is very shallow and Mxolisi Nyezwa’s poetry book, Song Trials. Spanish poems in English translations by the 20th century Spanish poets: Blas de Otero, Juan Roman Jimenez and Federico Garcia Lorca, published in the book titled Roots and Wings have had a huge impact on my construction of images. I also draw from the free-form and narrative prose poetry experiments of poets: Mangaliso Buzani, vangile gantsho and Ivy Alvarez. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-04
The effect of high-intensity interval training on cardiovascular and cardiometabolic health markers in young adults
- Authors: Inglis, Wade Vincent
- Date: 2021-04
- Subjects: Interval training , Cardiopulmonary system -- Blood-vessels
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/52499 , vital:43681
- Description: Background: Limited information related to changes in both the metabolic and blood profiles of healthy young adults engaging in either high-intensity interval training (HIIT) or moderate-intensity continuous training (MICT) modalities exists. The detrimental effects of sedentary lifestyles can be moderated and may be dependent on the intensity of the intervening activity. It is well known that regular physical activity (PA) can improve a person’s cardiorespiratory fitness (CRF) and therefore mitigate potential life-threatening effects of sedentary behaviours. Yet despite this, globally, approximately one out of every four adults fail to meet the minimum PA guidelines. Methods: Twenty-eight recreationally active adults from Nelson Mandela University (NMU) initially volunteered to participate in the study. The study was advertised on social media and via the NMU email MEMO database. Eight (n=8) participants were excluded from the study analysis as they failed to complete all the required testing sessions (illness: n=3; failure to attend 80% of sessions: n=2; lost interest: n=3), resulting in a total sample of 20 participants that were retained for analysis (HIIT (n=10) and MICT (n=10)). For inclusion to the study, all participants were required to: (i) be healthy before and during the testing period (ii) be between 18-35 years of age, and (iii) be free of injury before and during testing. Participants attended three training sessions per week for six weeks. HIIT and MICT interventions were matched for exercise load. Results: Within-group differences (i.e. pre- vs. post-intervention) were present, specifically for cardiovascular adaptations including maximal oxygen uptake (HIIT: +17.40%; MICT: +16.11%), gas exchange threshold (HIIT: +14.50%; MICT: +10.83%) and peak power output (HIIT: +38.92%; MICT: +33.79%), but not for cardiometabolic (p = 0.11 – 0.81). No between-group differences were evident for any measured parameters (p = 0.24-0.97), showing no clear preference for either HIIT or MICT modality. Conclusion: Acute improvements in CRF and metabolic biomarkers appeared to be independent of exercise intensity and were achievable within a relatively short time frame. , Thesis (MHMS) -- Faculty of Health Sciences, 2021
- Full Text: false
- Date Issued: 2020-11
- Authors: Inglis, Wade Vincent
- Date: 2021-04
- Subjects: Interval training , Cardiopulmonary system -- Blood-vessels
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/52499 , vital:43681
- Description: Background: Limited information related to changes in both the metabolic and blood profiles of healthy young adults engaging in either high-intensity interval training (HIIT) or moderate-intensity continuous training (MICT) modalities exists. The detrimental effects of sedentary lifestyles can be moderated and may be dependent on the intensity of the intervening activity. It is well known that regular physical activity (PA) can improve a person’s cardiorespiratory fitness (CRF) and therefore mitigate potential life-threatening effects of sedentary behaviours. Yet despite this, globally, approximately one out of every four adults fail to meet the minimum PA guidelines. Methods: Twenty-eight recreationally active adults from Nelson Mandela University (NMU) initially volunteered to participate in the study. The study was advertised on social media and via the NMU email MEMO database. Eight (n=8) participants were excluded from the study analysis as they failed to complete all the required testing sessions (illness: n=3; failure to attend 80% of sessions: n=2; lost interest: n=3), resulting in a total sample of 20 participants that were retained for analysis (HIIT (n=10) and MICT (n=10)). For inclusion to the study, all participants were required to: (i) be healthy before and during the testing period (ii) be between 18-35 years of age, and (iii) be free of injury before and during testing. Participants attended three training sessions per week for six weeks. HIIT and MICT interventions were matched for exercise load. Results: Within-group differences (i.e. pre- vs. post-intervention) were present, specifically for cardiovascular adaptations including maximal oxygen uptake (HIIT: +17.40%; MICT: +16.11%), gas exchange threshold (HIIT: +14.50%; MICT: +10.83%) and peak power output (HIIT: +38.92%; MICT: +33.79%), but not for cardiometabolic (p = 0.11 – 0.81). No between-group differences were evident for any measured parameters (p = 0.24-0.97), showing no clear preference for either HIIT or MICT modality. Conclusion: Acute improvements in CRF and metabolic biomarkers appeared to be independent of exercise intensity and were achievable within a relatively short time frame. , Thesis (MHMS) -- Faculty of Health Sciences, 2021
- Full Text: false
- Date Issued: 2020-11
The further development, application and evaluation of a sediment yield model (WQSED) for catchment management in African catchments
- Authors: Gwapedza, David
- Date: 2021-04
- Subjects: Sedimentation and deposition -- South Africa , Sedimentation and deposition -- Zimbabwe , Watersheds -- South Africa , Watersheds -- Zimbabwe , Watershed management -- Africa , Water quality -- South Africa , Water quality -- Zimbabwe , Modified Universal Soil Loss Equation (MUSLE) , Water Quality and Sediment Model (WQSED) , Soil and Water Assessment Tool (SWAT)
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/178376 , vital:42934 , 10.21504/10962/178376
- Description: Erosion and sediment transport are natural catchment processes that play an essential role in ecosystem functioning by providing habitat for aquatic organisms and contributing to the health of wetlands. However, excessive erosion and sedimentation, mostly driven by anthropogenic activity, lead to ecosystem degradation, loss of agricultural land, water quality problems, reduced reservoir storage capacity and damage to physical infrastructure. It is reported that up to 25% of dams in South Africa have lost approximately 30% of their initial storage capacity to sedimentation. Therefore, excessive sedimentation transcends from an ecological problem to a health, livelihood and water security issue. Erosion and sedimentation occur at variable temporal and spatial scales; therefore, monitoring of these processes can be difficult and expensive. Regardless of all these prohibiting factors, information on erosion and sediment remains an urgent requirement for the sustainable management of catchments. Models have evolved as tools to replicate and simulate complex natural processes to understand and manage these systems. Several models have been developed globally to simulate erosion and sediment transport. However, these models are not always applicable in Africa because 1) the conditions under which they were developed are not as relevant for African catchments 2) they have high data requirements and cannot be applied with ease in our data-scarce African catchments 3) they are sometimes complicated, and there are little training available or potential users simply have no time to dedicate towards learning these models. To respond to the problems of erosion, sedimentation, water quality and unavailability of applicable models, the current research further develops, applies and evaluates an erosion and sediment transport model, the Water Quality and Sediment Model (WQSED), for integration within the existing water resources framework in South Africa and application for practical catchment management. The WQSED was developed to simulate daily suspended sediment loads that are vital for water quality and quantity assessments. The WQSED was developed based on the Modified Universal Soil Loss Equation (MUSLE), and the Pitman model is a primary hydrological model providing forcing data, although flow data from independent sources may be used to drive the WQSED model. The MUSLE was developed in the United States of America, and this research attempts to improve the applicability of the MUSLE by identifying key issues that may impede its performance. Assessments conducted within the current research can be divided into scale assessment and application and evaluation assessment. The scale assessment involved evaluating spatial and temporal scale issues associated with the MUSLE. Spatial scale assessments were conducted using analytical and mathematical assessments on a hypothetical catchment. Temporal scale issues were assessed in terms of the vegetation cover (C) factor within the Tsitsa River catchment in South Africa. Model application and evaluation involved applying and calibrating the model to simulate daily time-series sediment yield. The model was applied to calibrated and validated (split-sample validation) in two catchments in South Africa, two catchments in Zimbabwe and three catchments were selected from the USA and associated territories for further testing as continuous daily time-series observed sediment data could not be readily accessed for catchments in the Southern African region. The catchments where the model was calibrated and validated range in size from 50 km2 to 20 000 km2. Additionally, the model was applied to thirteen ‘ungauged’ catchments selected from across South Africa, where only long-term reservoir sedimentation rates were available to compare with long term model simulations converted to sediment yield rates. The additional thirteen catchments were selected from areas of different climatic, vegetation and soils conditions characterising South Africa and range in size from 30 km2 to 2 500 km2. The current research results are split into a) MUSLE scale dependency and b) WQSED testing and evaluation. Scale dependency testing showed that the MUSLE could be spatially scale-dependent, particularly when a lumped approach is used, resulting in simulations of up to 30% more sediment. Spatial scale dependence in the MUSLE was found to be related to the runoff and topographic factors used and how they are calculated. The current study resorted to adopting a reference grid in applying the MUSLE, followed by scaling up the outputs to the total catchment area. Using a reference grid resulted in a general avoidance of the problem of spatial scale. The adoption of a seasonal vegetation cover factor was shown to significantly account for temporal changes of vegetation cover within a year and reduce over-estimations in sediment output. The temporal scale evaluation demonstrated the uncertainties associated with using a fixed vegetation cover factor in a catchment with variable rainfall and runoff pattern. The WQSED model evaluation showed that the model could be calibrated and validated to provide consistent results. Satisfactory model evaluation statistics were obtained for most catchments to which the model was applied, based on general model evaluation guidelines (Nash Sutcliffe Efficiency and R2 > 0.5). The model also performed generally well compared to established models that had been previously applied in some of the study catchments. The highest sediment yields recorded per country were 153 t km-2 year-1 (Tsitsa River; South Africa), 90 t km-2 year-1 (Odzi River; Zimbabwe) and 340 t km-2 year-1 (Rio Tanama; Puerto Rico). The results also displayed consistent underestimations of peak sediment yield events, partly attributed to sediment emanating from gullies that are not explicitly accounted for in the WQSED model structure. Furthermore, the calibration process revealed that the WQSED storage model is generally challenging to calibrate. An alternative simpler version of the storage model was easier to calibrate, but the model may still be challenging to apply to catchments where calibration data are not available. The additional evaluation of the WQSED simulated sediment yield rates against observed reservoir sediment rates showed a broad range of differences between the simulated and observed sediment yield rates. Differences between WQSED simulated sediment and observed reservoir sediment ranges from a low of 30% to a high of > 40 times. The large differences were partly attributed to WQSED being limited to simulating suspended sediment from sheet and rill processes, whereas reservoir sediment is generated from more sources that include bedload, channel and gully processes. Nevertheless, the model simulations replicated some of the regional sediment yield patterns and are assumed to represent sheet and rill contributions to reservoir sediment in selected catchments. The outcome of this study is an improved WQSED model that has successfully undergone preliminary testing and evaluation. Therefore, the model is sufficiently complete to be used by independent researchers and water resources managers to simulate erosion and sediment transport. However, the model is best applicable to areas where some observed data or regional information are available to calibrate the storage components and constrain model outputs. The report on potential MUSLE scale dependencies is relevant globally to all studies applying the MUSLE model and, therefore, can improve MUSLE application in future studies. The WQSED model offers a relatively simple, effective and applicable tool that is set to provide information to enhance catchment, land and water resources management in catchments of Africa. , Thesis (PhD) -- Faculty of Science, Institute for Water Research, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Gwapedza, David
- Date: 2021-04
- Subjects: Sedimentation and deposition -- South Africa , Sedimentation and deposition -- Zimbabwe , Watersheds -- South Africa , Watersheds -- Zimbabwe , Watershed management -- Africa , Water quality -- South Africa , Water quality -- Zimbabwe , Modified Universal Soil Loss Equation (MUSLE) , Water Quality and Sediment Model (WQSED) , Soil and Water Assessment Tool (SWAT)
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/178376 , vital:42934 , 10.21504/10962/178376
- Description: Erosion and sediment transport are natural catchment processes that play an essential role in ecosystem functioning by providing habitat for aquatic organisms and contributing to the health of wetlands. However, excessive erosion and sedimentation, mostly driven by anthropogenic activity, lead to ecosystem degradation, loss of agricultural land, water quality problems, reduced reservoir storage capacity and damage to physical infrastructure. It is reported that up to 25% of dams in South Africa have lost approximately 30% of their initial storage capacity to sedimentation. Therefore, excessive sedimentation transcends from an ecological problem to a health, livelihood and water security issue. Erosion and sedimentation occur at variable temporal and spatial scales; therefore, monitoring of these processes can be difficult and expensive. Regardless of all these prohibiting factors, information on erosion and sediment remains an urgent requirement for the sustainable management of catchments. Models have evolved as tools to replicate and simulate complex natural processes to understand and manage these systems. Several models have been developed globally to simulate erosion and sediment transport. However, these models are not always applicable in Africa because 1) the conditions under which they were developed are not as relevant for African catchments 2) they have high data requirements and cannot be applied with ease in our data-scarce African catchments 3) they are sometimes complicated, and there are little training available or potential users simply have no time to dedicate towards learning these models. To respond to the problems of erosion, sedimentation, water quality and unavailability of applicable models, the current research further develops, applies and evaluates an erosion and sediment transport model, the Water Quality and Sediment Model (WQSED), for integration within the existing water resources framework in South Africa and application for practical catchment management. The WQSED was developed to simulate daily suspended sediment loads that are vital for water quality and quantity assessments. The WQSED was developed based on the Modified Universal Soil Loss Equation (MUSLE), and the Pitman model is a primary hydrological model providing forcing data, although flow data from independent sources may be used to drive the WQSED model. The MUSLE was developed in the United States of America, and this research attempts to improve the applicability of the MUSLE by identifying key issues that may impede its performance. Assessments conducted within the current research can be divided into scale assessment and application and evaluation assessment. The scale assessment involved evaluating spatial and temporal scale issues associated with the MUSLE. Spatial scale assessments were conducted using analytical and mathematical assessments on a hypothetical catchment. Temporal scale issues were assessed in terms of the vegetation cover (C) factor within the Tsitsa River catchment in South Africa. Model application and evaluation involved applying and calibrating the model to simulate daily time-series sediment yield. The model was applied to calibrated and validated (split-sample validation) in two catchments in South Africa, two catchments in Zimbabwe and three catchments were selected from the USA and associated territories for further testing as continuous daily time-series observed sediment data could not be readily accessed for catchments in the Southern African region. The catchments where the model was calibrated and validated range in size from 50 km2 to 20 000 km2. Additionally, the model was applied to thirteen ‘ungauged’ catchments selected from across South Africa, where only long-term reservoir sedimentation rates were available to compare with long term model simulations converted to sediment yield rates. The additional thirteen catchments were selected from areas of different climatic, vegetation and soils conditions characterising South Africa and range in size from 30 km2 to 2 500 km2. The current research results are split into a) MUSLE scale dependency and b) WQSED testing and evaluation. Scale dependency testing showed that the MUSLE could be spatially scale-dependent, particularly when a lumped approach is used, resulting in simulations of up to 30% more sediment. Spatial scale dependence in the MUSLE was found to be related to the runoff and topographic factors used and how they are calculated. The current study resorted to adopting a reference grid in applying the MUSLE, followed by scaling up the outputs to the total catchment area. Using a reference grid resulted in a general avoidance of the problem of spatial scale. The adoption of a seasonal vegetation cover factor was shown to significantly account for temporal changes of vegetation cover within a year and reduce over-estimations in sediment output. The temporal scale evaluation demonstrated the uncertainties associated with using a fixed vegetation cover factor in a catchment with variable rainfall and runoff pattern. The WQSED model evaluation showed that the model could be calibrated and validated to provide consistent results. Satisfactory model evaluation statistics were obtained for most catchments to which the model was applied, based on general model evaluation guidelines (Nash Sutcliffe Efficiency and R2 > 0.5). The model also performed generally well compared to established models that had been previously applied in some of the study catchments. The highest sediment yields recorded per country were 153 t km-2 year-1 (Tsitsa River; South Africa), 90 t km-2 year-1 (Odzi River; Zimbabwe) and 340 t km-2 year-1 (Rio Tanama; Puerto Rico). The results also displayed consistent underestimations of peak sediment yield events, partly attributed to sediment emanating from gullies that are not explicitly accounted for in the WQSED model structure. Furthermore, the calibration process revealed that the WQSED storage model is generally challenging to calibrate. An alternative simpler version of the storage model was easier to calibrate, but the model may still be challenging to apply to catchments where calibration data are not available. The additional evaluation of the WQSED simulated sediment yield rates against observed reservoir sediment rates showed a broad range of differences between the simulated and observed sediment yield rates. Differences between WQSED simulated sediment and observed reservoir sediment ranges from a low of 30% to a high of > 40 times. The large differences were partly attributed to WQSED being limited to simulating suspended sediment from sheet and rill processes, whereas reservoir sediment is generated from more sources that include bedload, channel and gully processes. Nevertheless, the model simulations replicated some of the regional sediment yield patterns and are assumed to represent sheet and rill contributions to reservoir sediment in selected catchments. The outcome of this study is an improved WQSED model that has successfully undergone preliminary testing and evaluation. Therefore, the model is sufficiently complete to be used by independent researchers and water resources managers to simulate erosion and sediment transport. However, the model is best applicable to areas where some observed data or regional information are available to calibrate the storage components and constrain model outputs. The report on potential MUSLE scale dependencies is relevant globally to all studies applying the MUSLE model and, therefore, can improve MUSLE application in future studies. The WQSED model offers a relatively simple, effective and applicable tool that is set to provide information to enhance catchment, land and water resources management in catchments of Africa. , Thesis (PhD) -- Faculty of Science, Institute for Water Research, 2021
- Full Text:
- Date Issued: 2021-04
Ukuba Ngabantu Abapheleleyo: Black Queer Space Making and the unfinished business of the Truth and Reconciliation Commission of South Africa
- Authors: Lupindo, Esihle
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MSocSci
- Identifier: http://hdl.handle.net/10962/178479 , vital:42943
- Description: Access restricted until April 2023. , Thesis (MSocSci) -- Faculty of Humanities, Sociology, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Lupindo, Esihle
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MSocSci
- Identifier: http://hdl.handle.net/10962/178479 , vital:42943
- Description: Access restricted until April 2023. , Thesis (MSocSci) -- Faculty of Humanities, Sociology, 2021
- Full Text:
- Date Issued: 2021-04
Umemulo and Zulu girlhood: From preservation to variations of ukuhlonipha nokufihla (respect and secrecy)
- Authors: Mntambo, Londiwe Nompilo
- Date: 2021-04
- Subjects: Virginity , Zulu (African people) -- Rites and ceremonies , Zulu (African people) -- Social life and customs , Virginity -- Social aspects , Women, Zulu -- South Africa -- KwaZulu-Natal -- Social conditions , Women -- Social and moral questions
- Language: English , Zulu
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178352 , vital:42932
- Description: This study examines evolving definitions of ukuziphatha kahle that historically relied on the preservation of virginity for Zulu girls, who participate in the umemulo ceremony that marks the transition from girlhood to womanhood. It examines notions of Zulu girlhood as understood through preservation - ukugcina isibaya sikaBaba - and through respectability and secrecy - ukuhlonipha nokufihla. The study analyses how conceptions of ukuziphatha kahle (good behavior) have evolved in the context of sexual rights in the performance of Zulu girlhood. It is located in the interdisciplinary literature of global girlhood studies, and African feminist lenses of womanhood and rites of passages. The study draws from 26 interviews with Zulu women who have gone through umemulo, elder women who facilitate virginity testing and umemulo; and female relatives of women who have gone through umemulo in Estcourt, Wembezi, Paapkalius Fountain, Ntabamhlophe and Cornfields in KwaZulu-Natal. This thesis contextualises umemulo and ukuziphatha kahle (good behaviour) in democratic South Africa. Umemulo is a ritual done for a Zulu girl whose behaviour is deemed to be good. While this is clear, what constitutes ukuziphatha kahle (good behaviour) is contested. On stricter terms, ukuziphatha kahle means to be intombi nto (a virgin). The interviews with women who went through umemulo show that most of them were not virgins at the time of the ritual. The elder and younger women expressed that ukuziphatha kahle for them goes beyond the girl’s virginity. Instead, they understand it as a girl who does not have a child, and who has shown respect and obedience to her parents and elders. Strikingly, the study shows an inter-generational collusion between the younger and elder women, who maintain the outward appearance of virginity of the girls who participate in umemulo. The study argues that there are variations of ukuhlonipha (respect), which in the rights context of democratic South Africa overlap into ukufihla (secrecy). Importantly, it is clear that the concept of being a good Zulu womanhood holds and remains important for Zulu girls and women. However, the ways in which Zulu women experience and perform this is complex. The findings show that while many Zulu girls want to be seen as performing accepted good Zulu womanhood, they do so in ways that allow them to enjoy their sexual rights and pleasure. This is not a tension. , Thesis (MA) -- Faculty of Humanities, Politial and International Studies, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Mntambo, Londiwe Nompilo
- Date: 2021-04
- Subjects: Virginity , Zulu (African people) -- Rites and ceremonies , Zulu (African people) -- Social life and customs , Virginity -- Social aspects , Women, Zulu -- South Africa -- KwaZulu-Natal -- Social conditions , Women -- Social and moral questions
- Language: English , Zulu
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178352 , vital:42932
- Description: This study examines evolving definitions of ukuziphatha kahle that historically relied on the preservation of virginity for Zulu girls, who participate in the umemulo ceremony that marks the transition from girlhood to womanhood. It examines notions of Zulu girlhood as understood through preservation - ukugcina isibaya sikaBaba - and through respectability and secrecy - ukuhlonipha nokufihla. The study analyses how conceptions of ukuziphatha kahle (good behavior) have evolved in the context of sexual rights in the performance of Zulu girlhood. It is located in the interdisciplinary literature of global girlhood studies, and African feminist lenses of womanhood and rites of passages. The study draws from 26 interviews with Zulu women who have gone through umemulo, elder women who facilitate virginity testing and umemulo; and female relatives of women who have gone through umemulo in Estcourt, Wembezi, Paapkalius Fountain, Ntabamhlophe and Cornfields in KwaZulu-Natal. This thesis contextualises umemulo and ukuziphatha kahle (good behaviour) in democratic South Africa. Umemulo is a ritual done for a Zulu girl whose behaviour is deemed to be good. While this is clear, what constitutes ukuziphatha kahle (good behaviour) is contested. On stricter terms, ukuziphatha kahle means to be intombi nto (a virgin). The interviews with women who went through umemulo show that most of them were not virgins at the time of the ritual. The elder and younger women expressed that ukuziphatha kahle for them goes beyond the girl’s virginity. Instead, they understand it as a girl who does not have a child, and who has shown respect and obedience to her parents and elders. Strikingly, the study shows an inter-generational collusion between the younger and elder women, who maintain the outward appearance of virginity of the girls who participate in umemulo. The study argues that there are variations of ukuhlonipha (respect), which in the rights context of democratic South Africa overlap into ukufihla (secrecy). Importantly, it is clear that the concept of being a good Zulu womanhood holds and remains important for Zulu girls and women. However, the ways in which Zulu women experience and perform this is complex. The findings show that while many Zulu girls want to be seen as performing accepted good Zulu womanhood, they do so in ways that allow them to enjoy their sexual rights and pleasure. This is not a tension. , Thesis (MA) -- Faculty of Humanities, Politial and International Studies, 2021
- Full Text:
- Date Issued: 2021-04
Agricultural entrepreneurship development as strategy for economic empowerment: The case of small-scale farmers in Eastern Cape Province of South Africa
- Authors: Akinwale, Olusola Mokayode
- Date: 2020-11
- Subjects: Sustainable development -- South Africa -- Eastern Cape , South Africa -- Economic conditions
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10353/20241 , vital:45637
- Description: This study emanated from the struggle for economic empowerment among small-scale farmers in South African. The study advocates for the establishment of a viable environment where agricultural entrepreneurship can thrive. While the South African Nation Development Plan (NDP) proposed to create one million jobs through agricultural sector by 2030, the majority of small-scale farmers in South Africa are struggling to grow beyond the level of subsistence farming, and the youths appear not to be interested in the farming. It is therefore become necessary to conduct this current study that is exploratory in nature; it explored several factors and barriers to agricultural entrepreneurship development, as well as factors that can contribute to the development of prosperous and sustainable agricultural entrepreneurship among small-scale farmers in South African. The study was conducted in two district municipalities of Eastern Cape Province of South Africa – OR Tambo and Chris Hani. Both quantitative and qualitative research methods were used to make findings. Findings from the study shows that economic empowerment can be achieved through agricultural entrepreneurship development by giving adequate attention to specific factors like individuals’ attitude, production skills, access to market and marketing skills, management skills. Empirically, basic components like personal interests, adequate training and background, efficient extension service, famers’ network and communication, specific goal-oriented, understanding market, farmers’ collaboration, and access to sufficient funding are few of the factors that will make the small-scale farmers grow to the level of commercial farming. The study concluded that prerequisite to developing a sustainable agricultural entrepreneurship climate among small-scale farmers in South African is the combination of basic components aforementioned. Suggestions were made for strong collaboration between government and private sectors to provide development assistance for small-scale farmers as they struggles to develop their small-scale farming to sustainable entrepreneurship level. , Thesis (DPhil) -- Faculty of Management and Commerce, 2020
- Full Text:
- Date Issued: 2020-11
- Authors: Akinwale, Olusola Mokayode
- Date: 2020-11
- Subjects: Sustainable development -- South Africa -- Eastern Cape , South Africa -- Economic conditions
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10353/20241 , vital:45637
- Description: This study emanated from the struggle for economic empowerment among small-scale farmers in South African. The study advocates for the establishment of a viable environment where agricultural entrepreneurship can thrive. While the South African Nation Development Plan (NDP) proposed to create one million jobs through agricultural sector by 2030, the majority of small-scale farmers in South Africa are struggling to grow beyond the level of subsistence farming, and the youths appear not to be interested in the farming. It is therefore become necessary to conduct this current study that is exploratory in nature; it explored several factors and barriers to agricultural entrepreneurship development, as well as factors that can contribute to the development of prosperous and sustainable agricultural entrepreneurship among small-scale farmers in South African. The study was conducted in two district municipalities of Eastern Cape Province of South Africa – OR Tambo and Chris Hani. Both quantitative and qualitative research methods were used to make findings. Findings from the study shows that economic empowerment can be achieved through agricultural entrepreneurship development by giving adequate attention to specific factors like individuals’ attitude, production skills, access to market and marketing skills, management skills. Empirically, basic components like personal interests, adequate training and background, efficient extension service, famers’ network and communication, specific goal-oriented, understanding market, farmers’ collaboration, and access to sufficient funding are few of the factors that will make the small-scale farmers grow to the level of commercial farming. The study concluded that prerequisite to developing a sustainable agricultural entrepreneurship climate among small-scale farmers in South African is the combination of basic components aforementioned. Suggestions were made for strong collaboration between government and private sectors to provide development assistance for small-scale farmers as they struggles to develop their small-scale farming to sustainable entrepreneurship level. , Thesis (DPhil) -- Faculty of Management and Commerce, 2020
- Full Text:
- Date Issued: 2020-11
An exploration of factors contributing to gender-based violence among university students in selected universities of South Africa
- Nobevu, luyolo Renald https://orcid.org/0000-0002-0494-2164
- Authors: Nobevu, luyolo Renald https://orcid.org/0000-0002-0494-2164
- Date: 2020-11
- Subjects: Gender-based violence , Sexual harassment in education , College students
- Language: English
- Type: Master'stheses , text
- Identifier: http://hdl.handle.net/10353/27050 , vital:66243
- Description: Gender-based violence among university students is a major problem in South Africa and the world at large. The incidence of gender-based violence among university students is increasing for both males and females. In South Africa, many university students are likely to be victims of both direct and indirect gender-based violence this brings to doubt the efficacy of policies to address gender-based violence. This study explored factors contributing to gender-based violence among university students in selected universities of South Africa. The study opted for a qualitative research approach to achieve its primary aim. The study used the case study research design. Furthermore, the study utilised a non-probability sampling method and purposive sampling technique to generate a sample size of 25 participants. Participants were selected based on the supposed value they would add to the study. The study employed in-depth interviews, focus group discussions, secondary data, and key informant interviews for the data collection method. There were three focus groups with 4 participants each, and two of the groups comprised university students and one of the key informants. The Modified lifestyle exposure model of personal victimisation and the Gender Role theory formed the theoretical framework that guided the study. The study established that even though many universities have develop policies to address gender-based violence there is poor implementation. This may be the result of not monitoring effectively which led the policy to be invisible to the students only appear on paper not into practice. In addition, many university students who are the victims of gender-based violence do not report their experiences to authorities in their institutions or to the police because of the fear that they can be victimised again or their perpetrators are those who are in authorities. Meanwhile, the universities do not have sufficient programs for GBV , Thesis (MSoc) -- Faculty of Social Sciences and Humanities, 2020
- Full Text:
- Date Issued: 2020-11
- Authors: Nobevu, luyolo Renald https://orcid.org/0000-0002-0494-2164
- Date: 2020-11
- Subjects: Gender-based violence , Sexual harassment in education , College students
- Language: English
- Type: Master'stheses , text
- Identifier: http://hdl.handle.net/10353/27050 , vital:66243
- Description: Gender-based violence among university students is a major problem in South Africa and the world at large. The incidence of gender-based violence among university students is increasing for both males and females. In South Africa, many university students are likely to be victims of both direct and indirect gender-based violence this brings to doubt the efficacy of policies to address gender-based violence. This study explored factors contributing to gender-based violence among university students in selected universities of South Africa. The study opted for a qualitative research approach to achieve its primary aim. The study used the case study research design. Furthermore, the study utilised a non-probability sampling method and purposive sampling technique to generate a sample size of 25 participants. Participants were selected based on the supposed value they would add to the study. The study employed in-depth interviews, focus group discussions, secondary data, and key informant interviews for the data collection method. There were three focus groups with 4 participants each, and two of the groups comprised university students and one of the key informants. The Modified lifestyle exposure model of personal victimisation and the Gender Role theory formed the theoretical framework that guided the study. The study established that even though many universities have develop policies to address gender-based violence there is poor implementation. This may be the result of not monitoring effectively which led the policy to be invisible to the students only appear on paper not into practice. In addition, many university students who are the victims of gender-based violence do not report their experiences to authorities in their institutions or to the police because of the fear that they can be victimised again or their perpetrators are those who are in authorities. Meanwhile, the universities do not have sufficient programs for GBV , Thesis (MSoc) -- Faculty of Social Sciences and Humanities, 2020
- Full Text:
- Date Issued: 2020-11
Effect of different fat levels and Moringa oleifera leaf meal (MOLM) inclusion on proximate composition, fatty acid profile, lipid oxidation, and sensory attributes of chicken droëwors
- Authors: Tembela, Nelisiwe
- Date: 2020-11
- Subjects: Moringa oleifera , Meat--Quality , Broilers (Chickens)
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/20893 , vital:46709
- Description: The objective of the study was to determine the effect of different fat levels and Moringa oleifera leaf meal (MLM) inclusion on sensory attributes (aroma, meat flavour, spicy flavour, texture, colour, and saltiness), lipid oxidation, proximate composition, and fatty acid (FA) profile of chicken droëwors. Firstly, sensory attributes of chicken droëwors with different levels of fat and that of Moringa oleifera leaf meal were determined. In the second experiment, the effect of different fat and MLM inclusion levels on lipid oxidation during drying and storage, proximate composition, and fatty acid profile were also determined. A forty randomly selected consumers of different gender and age were used as the sensory panel. 75 percent of lean chicken meat and 25 percent of chicken fat was used during droëwors preparation. Thereafter, 9 treatments of chicken droëwors were produced, with MLM included either at 0 percent, 0.25 percent, 0.5 percent, and fat included at 10 percent and 15 percent. For fatty acid profile, the total lipid from dry sausage of all treatments was quantitatively extracted using chloroform and methanol in a ratio of 2:1. Lipid oxidation was measured by analyzing thiobarbituric acid reactive substances (TBARS) at intervals during drying (0, 0.25, 0.5, 72h) and after 7 days of storage under ambient conditions. The results showed that consumers like the chicken droëwors when 0.5 percent MLM added to the product. The inclusion of MLM in chicken droëwors had a positive effect on consumer sensory. The results of the study demonstrated that chicken droëwors contained a significantly higher percentage (P<0.05) of C18:1c9 (Oleic) (30.95 to 32.65 percent) acid than other fatty acids. Polyunsaturated fatty acids (PUFAs) were all non-significant (P˃0.05) except for Docosahexanoic, which was observed to be significant (P˂ 0.05) in all treatments except T1. There was no significance (P> 0.05) in mono-unsaturated fatty acids (MUFAs), except for Elaidic, vaccenic, linoleic, y-linoleic, erucic, and arachidonic. Lipid oxidation occurred more rapidly (P<0.05) when MLM was not added. During processing and storage, TBARS were higher (P< 0.05) in chicken droewors. TBARS during storage were lower (P>0.05) with MLM added. Results showed a significant difference (P<0.05) in proximate composition of chicken droëwors, containing on average 16.93±1.29 to 10.79± 1.83/ 100 g moisture, 45.80± 1.65 to 67.56± 2.33/ 100 g protein, 14.37± 2.15 to 26.13± 2.15/100 g ash. The current study resultsgave a summary of the composition of chicken droëwors and showed higher susceptibility to lipid oxidation in chicken droewors. Therefore, Moringa oleifera leaf powder showed antioxidant activity in chicken droëwors, reserved lipid oxidation in the product. In conclusion, MLM could be used as a functional antioxidant preservative in chicken droëwors. , Thesis (MSc) (Animal Science) -- University of Fort Hare, 2021
- Full Text:
- Date Issued: 2020-11
- Authors: Tembela, Nelisiwe
- Date: 2020-11
- Subjects: Moringa oleifera , Meat--Quality , Broilers (Chickens)
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/20893 , vital:46709
- Description: The objective of the study was to determine the effect of different fat levels and Moringa oleifera leaf meal (MLM) inclusion on sensory attributes (aroma, meat flavour, spicy flavour, texture, colour, and saltiness), lipid oxidation, proximate composition, and fatty acid (FA) profile of chicken droëwors. Firstly, sensory attributes of chicken droëwors with different levels of fat and that of Moringa oleifera leaf meal were determined. In the second experiment, the effect of different fat and MLM inclusion levels on lipid oxidation during drying and storage, proximate composition, and fatty acid profile were also determined. A forty randomly selected consumers of different gender and age were used as the sensory panel. 75 percent of lean chicken meat and 25 percent of chicken fat was used during droëwors preparation. Thereafter, 9 treatments of chicken droëwors were produced, with MLM included either at 0 percent, 0.25 percent, 0.5 percent, and fat included at 10 percent and 15 percent. For fatty acid profile, the total lipid from dry sausage of all treatments was quantitatively extracted using chloroform and methanol in a ratio of 2:1. Lipid oxidation was measured by analyzing thiobarbituric acid reactive substances (TBARS) at intervals during drying (0, 0.25, 0.5, 72h) and after 7 days of storage under ambient conditions. The results showed that consumers like the chicken droëwors when 0.5 percent MLM added to the product. The inclusion of MLM in chicken droëwors had a positive effect on consumer sensory. The results of the study demonstrated that chicken droëwors contained a significantly higher percentage (P<0.05) of C18:1c9 (Oleic) (30.95 to 32.65 percent) acid than other fatty acids. Polyunsaturated fatty acids (PUFAs) were all non-significant (P˃0.05) except for Docosahexanoic, which was observed to be significant (P˂ 0.05) in all treatments except T1. There was no significance (P> 0.05) in mono-unsaturated fatty acids (MUFAs), except for Elaidic, vaccenic, linoleic, y-linoleic, erucic, and arachidonic. Lipid oxidation occurred more rapidly (P<0.05) when MLM was not added. During processing and storage, TBARS were higher (P< 0.05) in chicken droewors. TBARS during storage were lower (P>0.05) with MLM added. Results showed a significant difference (P<0.05) in proximate composition of chicken droëwors, containing on average 16.93±1.29 to 10.79± 1.83/ 100 g moisture, 45.80± 1.65 to 67.56± 2.33/ 100 g protein, 14.37± 2.15 to 26.13± 2.15/100 g ash. The current study resultsgave a summary of the composition of chicken droëwors and showed higher susceptibility to lipid oxidation in chicken droewors. Therefore, Moringa oleifera leaf powder showed antioxidant activity in chicken droëwors, reserved lipid oxidation in the product. In conclusion, MLM could be used as a functional antioxidant preservative in chicken droëwors. , Thesis (MSc) (Animal Science) -- University of Fort Hare, 2021
- Full Text:
- Date Issued: 2020-11