Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Ocean-modelling"”.
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Data-driven Ocean Modelling
… and assessing data-driven models of the ocean. Specifically we develop data-driven emulators of an idealised configuration of a physics-based ocean simulator, MITgcm. While work focuses on idealised cases, these simplified configurations nevertheless capture important aspects of the …
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High order hybrid discontinuous Galerkin regional ocean modelling
… physical and biogeochemical dynamics in coastal ocean regions is required for multiple scientific and societal applications, covering a wide range of time and space scales. However, in light of the strong nonlinearities observed in coastal regions and in biological processes, such modeling is …
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Modelling wind-driven inter-ocean exchange in the greater Agulhas with the regional ocean modelling system
Two Regional Ocean Modelling System configurations, AGIO and ARC112, are developed to investigate (1) the structure of the Agulhas leakage, (2) the dynamical link between the leakage and the Agulhas Current, and (3) the sensitivity of this link to changes in the regional wind field. Both …
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Environmental requirements for optimal naval operational efficiency
In this thesis the applicability of ocean environment modelling as a part of optimal naval operational efficiency, and thus military oceanography, is evaluated. To be able to do this, the principles of knowledge-based warfare and the ability to make rapid environmental assessments, are introduced. …
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Equilibrium dynamics of the Benguela system : a numerical modelling approach
The Regional Ocean Modelling System (ROMS) is used to systematically investigate equilibrium conditions and seasonal variations of the Benguela system, including both the large-scale flow regime as well as the coastal upswelling regime. A shelf-edge poleward flow exists in the northern Benguela …
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Stable and high order accurate finite difference method for the incompressible laminar boundary layer equations
… ranges from the large-scale fluid's flow modelling such as aerodynamics [1], atmospheric-ocean modelling [2] to a simple pipe flows in the petroleum industry [3]. This study is devoted to develop a provably stable and high order approximation for the incompressible laminar boundary layer …
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The variability of retention in St Helena Bay
… using seasonal climatologies of the Regional Ocean Modelling System (ROMS). While retention has been studied biologically, the seasonality of the hydrodynamics contributing to the retention have received less attention. In this study we explore how the sea temperature, atmospheric forcing and …
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A numerical investigation of the influence of monsoonal wind reversals over the East African coastal ocean
… the variability in the East African coastal ocean (Somali basin) due to the monsoon transition is investigated. The monsoon is characterized by wind reversals and seasonality in the precipitation of a region. The surface circulation of the western Indian Ocean during the summer (JAS) and …
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Is our evidence contaminated? Tracing the ways in which proof is validated in the context of Cape Town's marine effluent outfalls
… discovered that the outfall was polluting the ocean and then considers the evidence utilised by the CoCT in their responses to these concerns and in their permit application. The study finds that the CoCT's commissioned CSIR report and the use of tourism-orientated Blue Flag criteria are not …
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Simulation of annual cycles of phytoplankton, zooplankton and nutrients using a mixed layer model coupled with a biological model
In oceanography, the mixed layer refers to the near surface part of the water column where physical and biological variables are distributed quasi homogeneously. Its depth depends on conditions at the air-sea interface (heat and freshwater fluxes, wind stress) and on the characteristics of the flow …
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Annual cycle of the Benguela Jet
… sensed and model output data (from the Regional Ocean Modelling System). Two altimeter tracks were identified as best suited to study the Benguela Jet: the Topex-A / Jason-1A Track number 209 which crosses the Benguela Jet current in its northern region off the Cape Columbine and the Topex-B / …
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Explaining marine debris on New Zealand beaches: Empirical beach litter data and an evaluation of waste management practices
… waste management factors in generalized linear modelling resulted in a better fit. Models specified the following significant waste management predictors: 1) the presence of a regional coordinating waste management document (less AMD), 2) the presence of rubbish bins on the beach (more AMD), and …
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High Resolution Circulation of the Hawkesbury Shelf Region, SE Australia: Mean, Variability and Transport Pathways
The exchange between the open ocean and coastal waters within continental shelf systems is driven by complex circulation processes making it hard to measure and observe. They are highly productive regions, sustaining marine ecosystems and are often nursery areas for many organisms, providing the …
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Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean
… being the root cause. Using the Regional Ocean Modelling System and an individual-based model for the western Indian Ocean, this thesis explored the general circulation patterns (both large and mesoscale) important to dispersal and connectivity of broadcast corals while identifying regions …
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Numerical modelling of the coastal ocean off Tanzania
In this model study of the coastal ocean off Tanzania, the Regional Ocean Modelling System (ROMS) was employed to model the coastal ocean off Tanzania over the domain of 5°N-15°S and 38-55°E. It was integrated for ten years with monthly mean Comprehensive Ocean and Atmosphere Data Sets (COADS) …
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Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system
… physical-biogeochemical models namely, (Regional Ocean Modelling System and Biogeochemical of Eastern Boundary Upwelling Systems) ROMS-BioEBUS (3D) and (Nucleus for European Modelling of the Ocean and Biogeochemical Flux Model) NEMO-BFM (1D) are applied in the Benguela upwelling system to …
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Upper ocean variability and tropical cyclones in the South West Indian Ocean
… (BLT). Similar to cyclones in other tropical ocean basins, tropical cyclones in the South West Indian Ocean also cause significant social and economic damage in southeastern Africa and Madagascar. To forecast TC intensity more accurately, monitoring upper ocean conditions in the South Indian …