Developing ocean particle tracking tools for cross-disciplinary oceanic research with applications in the Agulhas current region
- Hart-Davis, Michael Geofrey, Backeberg, Björn C
- Authors: Hart-Davis, Michael Geofrey , Backeberg, Björn C
- Date: 2019
- Subjects: Ocean currents , Ocean currents -- Measurement Oceanography Oceanography -- Research -- South Atlantic Ocean
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/42308 , vital:36644
- Description: Lagrangian ocean analysis is a powerful way to study ocean processes from in-situ observations and numerical model simulations. As numerical modelling capabilities develop and physical mechanisms of the ocean are better understood, the importance of particle trajectory modelling continues to increase. Therefore, developing cross-disciplinary particle trajectory model applications for the Greater Agulhas System is highly relevant due to its potential contribution to scientific studies and operational applications. This thesis presents the results of developing particle trajectory model applications in the Greater Agulhas System towards better understanding the physical mechanisms that drive ocean processes in the region. The model is used in three applications that demonstrate their cross-disciplinary potential. These applications include a search and rescue scenario, the study of ocean dynamics and the study of the fate of juvenile turtles. Introducing spatially and temporally varying stochastic motion to account for the processes not resolved in the ocean surface current products, as well as including more appropriate boundary conditions, were shown to improve the accuracy of virtual drifters in representing the trajectory of a real surface drifter. Next, implementing the spatially and temporally varying stochastic motion in the particle trajectory model and applying it to a search and rescue scenario of a capsized catamaran revealed that including both winds and surface ocean currents in the particle trajectory model allowed for an improved prediction of the capsized vessel’s trajectory. By comparing a pair of real surface drifters with the particle trajectory model and analysing high resolution sea surface temperature (SST) fields it was shown that the formation of an eddy on the Agulhas Plateau combined with the weakening of the core current velocity resulted in enhanced eddycurrent interactions facilitating the separation of the real surface drifter-pair as they passed through this region. Lastly, the particle trajectory model was used to study the importance of including active swimming characteristic when studying the fate of juvenile turtles. It was found that including active swimming resulted in a change in the distribution of juvenile turtles and, therefore, needs to be included to provide a proper understanding of the fate of juvenile turtles in the ocean. With further development and refinement of the particle trajectory model, Lagrangian ocean analysis has the potential to provide valuable information towards improving our understanding of physical and biological ocean processes at a range of spatial and temporal scales with potential operational oceanography applications.
- Full Text:
- Date Issued: 2019
- Authors: Hart-Davis, Michael Geofrey , Backeberg, Björn C
- Date: 2019
- Subjects: Ocean currents , Ocean currents -- Measurement Oceanography Oceanography -- Research -- South Atlantic Ocean
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/42308 , vital:36644
- Description: Lagrangian ocean analysis is a powerful way to study ocean processes from in-situ observations and numerical model simulations. As numerical modelling capabilities develop and physical mechanisms of the ocean are better understood, the importance of particle trajectory modelling continues to increase. Therefore, developing cross-disciplinary particle trajectory model applications for the Greater Agulhas System is highly relevant due to its potential contribution to scientific studies and operational applications. This thesis presents the results of developing particle trajectory model applications in the Greater Agulhas System towards better understanding the physical mechanisms that drive ocean processes in the region. The model is used in three applications that demonstrate their cross-disciplinary potential. These applications include a search and rescue scenario, the study of ocean dynamics and the study of the fate of juvenile turtles. Introducing spatially and temporally varying stochastic motion to account for the processes not resolved in the ocean surface current products, as well as including more appropriate boundary conditions, were shown to improve the accuracy of virtual drifters in representing the trajectory of a real surface drifter. Next, implementing the spatially and temporally varying stochastic motion in the particle trajectory model and applying it to a search and rescue scenario of a capsized catamaran revealed that including both winds and surface ocean currents in the particle trajectory model allowed for an improved prediction of the capsized vessel’s trajectory. By comparing a pair of real surface drifters with the particle trajectory model and analysing high resolution sea surface temperature (SST) fields it was shown that the formation of an eddy on the Agulhas Plateau combined with the weakening of the core current velocity resulted in enhanced eddycurrent interactions facilitating the separation of the real surface drifter-pair as they passed through this region. Lastly, the particle trajectory model was used to study the importance of including active swimming characteristic when studying the fate of juvenile turtles. It was found that including active swimming resulted in a change in the distribution of juvenile turtles and, therefore, needs to be included to provide a proper understanding of the fate of juvenile turtles in the ocean. With further development and refinement of the particle trajectory model, Lagrangian ocean analysis has the potential to provide valuable information towards improving our understanding of physical and biological ocean processes at a range of spatial and temporal scales with potential operational oceanography applications.
- Full Text:
- Date Issued: 2019
Management of street traders to boost the local economy in King William's Town (Buffalo City Municipality)
- Authors: Hlope, Sithabiso Patrick
- Date: 2016
- Subjects: Economic policy King William's Town (South Africa) -- Economic policy , Street vendors -- South Africa -- King William's Town
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/13049 , vital:27147
- Description: This study deals with the management of street traders to boost the local economy of King William‟s Town. The purpose of the study is to conduct the research on how street traders can be managed to boost the local economy of King William‟s Town. The intention is to research the challenges they have and how to improve them. To be able to conduct the study, the researcher deemed it necessary to study existing literature on Local Economic Development. The way street traders are managed presently has been investigated and analysed in order to develop recommendations for solving the challenges facing street trading in King William‟s Town. The researcher conducted interviews in the form of face-to-face discussions and scheduled interviews with street traders, municipal authorities, and the iQonce Small Business Association. The literature review and interviews enabled the researcher to develop recommendations to solve the challenges. These recommendations will be helpful to the King William‟s Town municipality. The findings of this study reveal that there are challenges in the manner in which street trading is managed in King William‟s Town. Some of the challenges are a lack of a LED policy, poor infrastructure, failure to implement decisions, lack of financial support for street traders, and underutilisation of the budget. The researcher has made some recommendations in terms of support and assistance for street traders, the formulation of a LED policy, and plans and systems needed to be put in place for the management of street trading in King William‟s Town. The researcher summarises the study by claiming that if the proposed recommendations can be thoroughly implemented, there will be some improvement in the manner in which the street traders are managed.
- Full Text:
- Date Issued: 2016
- Authors: Hlope, Sithabiso Patrick
- Date: 2016
- Subjects: Economic policy King William's Town (South Africa) -- Economic policy , Street vendors -- South Africa -- King William's Town
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/13049 , vital:27147
- Description: This study deals with the management of street traders to boost the local economy of King William‟s Town. The purpose of the study is to conduct the research on how street traders can be managed to boost the local economy of King William‟s Town. The intention is to research the challenges they have and how to improve them. To be able to conduct the study, the researcher deemed it necessary to study existing literature on Local Economic Development. The way street traders are managed presently has been investigated and analysed in order to develop recommendations for solving the challenges facing street trading in King William‟s Town. The researcher conducted interviews in the form of face-to-face discussions and scheduled interviews with street traders, municipal authorities, and the iQonce Small Business Association. The literature review and interviews enabled the researcher to develop recommendations to solve the challenges. These recommendations will be helpful to the King William‟s Town municipality. The findings of this study reveal that there are challenges in the manner in which street trading is managed in King William‟s Town. Some of the challenges are a lack of a LED policy, poor infrastructure, failure to implement decisions, lack of financial support for street traders, and underutilisation of the budget. The researcher has made some recommendations in terms of support and assistance for street traders, the formulation of a LED policy, and plans and systems needed to be put in place for the management of street trading in King William‟s Town. The researcher summarises the study by claiming that if the proposed recommendations can be thoroughly implemented, there will be some improvement in the manner in which the street traders are managed.
- Full Text:
- Date Issued: 2016
The effect of varied instructions on prison guard role behaviour expectations
- Authors: Githaiga, Sandra J N
- Date: 2008
- Subjects: Prison psychology -- Experiments , Role expectations , Imprisonment -- Experiments
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9908 , http://hdl.handle.net/10948/961 , Prison psychology -- Experiments , Role expectations , Imprisonment -- Experiments
- Description: The Stanford Prison Experiment (SPE) was conducted to determine the psychological and behavioural effects of adopting the roles of prisoners or prison guards. In various published research articles Zimbardo reported that he instructed the prison guards to maintain law and order (Haney, Banks, & Zimbardo, 1973). However, in the Quiet Rage video (Zimbardo, 1989), Zimbardo gave the prison guards additional detailed instructions. To examine the effects of these different instructions on expected prison guard role behaviour, first year Psychology students were requested to predict expected prison guard role behaviour under two different conditions. In the order condition, participants received the instructions used in published research articles. While in the fear condition, participants received the instructions from the Quiet Rage video (Zimbardo, 1989). Participants estimated the likelihood of 50 guard behaviours. Participants in the order condition predicted more pleasant behaviour, while participants in the fear condition predicted more unpleasant behaviours. This indicates that the different instructions influenced their intent to perform the different behaviours. There was no significant difference between the fear and order conditions, and the control behaviours. Participants in both the fear and order conditions rated the control items as expected prison guard role behaviour. Participants in both conditions indicated that they would behave in this manner. Gender had no significant influence on expected prison guard role behavior.
- Full Text:
- Date Issued: 2008
- Authors: Githaiga, Sandra J N
- Date: 2008
- Subjects: Prison psychology -- Experiments , Role expectations , Imprisonment -- Experiments
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9908 , http://hdl.handle.net/10948/961 , Prison psychology -- Experiments , Role expectations , Imprisonment -- Experiments
- Description: The Stanford Prison Experiment (SPE) was conducted to determine the psychological and behavioural effects of adopting the roles of prisoners or prison guards. In various published research articles Zimbardo reported that he instructed the prison guards to maintain law and order (Haney, Banks, & Zimbardo, 1973). However, in the Quiet Rage video (Zimbardo, 1989), Zimbardo gave the prison guards additional detailed instructions. To examine the effects of these different instructions on expected prison guard role behaviour, first year Psychology students were requested to predict expected prison guard role behaviour under two different conditions. In the order condition, participants received the instructions used in published research articles. While in the fear condition, participants received the instructions from the Quiet Rage video (Zimbardo, 1989). Participants estimated the likelihood of 50 guard behaviours. Participants in the order condition predicted more pleasant behaviour, while participants in the fear condition predicted more unpleasant behaviours. This indicates that the different instructions influenced their intent to perform the different behaviours. There was no significant difference between the fear and order conditions, and the control behaviours. Participants in both the fear and order conditions rated the control items as expected prison guard role behaviour. Participants in both conditions indicated that they would behave in this manner. Gender had no significant influence on expected prison guard role behavior.
- Full Text:
- Date Issued: 2008
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