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 20 of 34 for “"Ocean Modeling"”.
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Data-driven ocean modeling using neural diferential equations
… cloud in the atmosphere or eddying swirl in the ocean. However, collectively these small-scale turbulent processes play a key role in setting Earth’s climate. Climate models attempt to represent unresolved scales via surrogate models known as parameterizations. However, these parameterizations …
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Mimetic Coastal Ocean Modeling In General Coordinates And Using Machine Learning Based Predictions
… accurately. The General Curvilinear Coastal Ocean Model (GCCOM) was validated, serial and parallel versions for a set of experiments showcasing stratified and non-hydrostatic flow phenomena. Still, the 3D curvilinear capability has proven to be elusive. We apply cutting-edge numerical methods …
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Intelligent Planning and Assimilation of AUV-Obtained Measurements Within a ROMS-Based Ocean Modeling System
Efforts to learn more about the oceans that surround us have increased dramatically as the technological ability to do so grows. Autonomous Underwater Vehicles (AUVs) are one such technological advance. They allow for rapid deployment and can gather data quickly in places and ways that traditional …
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High-order Discontinuous Galerkin Methods and Deep Reinforcement Learning with Application to Multiscale Ocean Modeling
… availability of computational power, numerical modeling plays an increasingly pivotal role in the field of oceanography, enabling scientists to explore and understand ocean processes which are otherwise inaccessible or challenging to observe directly. It provides a crucial tool for investigating …
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Zooplankton population variability in a warming ocean: Modeling spatiotemporal patterns and drivers within a dynamic shelf ecosystem
… in the subarctic North Atlantic. First, spatial modeling of C. finmarchicus synchrony reveals that populations in the well-connected NES ecosystem are highly variable and predominantly driven by local habitat heterogeneity rather than region-wide environmental conditions. Notably, populations …
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Time-Optimal Path Planning in the Portugal-Azores-Madeira Ocean Region
For intelligent ocean exploration and sustainable ocean utilization, the need for smart autonomous underwater vehicles (AUVs), surface craft, and small aircrafts is rapidly increasing. The challenge of creating an optimal navigation route between departure and destination points for these vehicles …
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Descriptive analysis of a virtual transect through the Benguela Upwelling System
… the limitations of in situ observations of the ocean, numerical modeling of the ocean can easily provide clues to the structures and processes that lie therein. This project is an example of the examination of numerical model output. In this case, the area of interest is an area of ocean off …
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Reachability prediction and optimal path planning for autonomous ocean vehicles
For intelligent ocean exploration and sustainable ocean utilization, the need for smart autonomous underwater vehicles (AUVs), surface craft, and small aircraft is rapidly increasing. Creating time-optimal navigation routes for these vehicles has wide-ranging applications, including ocean data …
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Interannual variability of air-sea fluxes of carbon dioxide and oxygen
… CO2 into the terrestrial biota and the ocean. Year-to-year changes in the CO2 growth rate that exceed variations in the fossil fuel source indicate a significant variability in these global CO2 sinks. However, the enormous complexity of the terrestrial and oceanic biogeochemical systems …
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Modeling flow encountering abrupt topography using hybridizable discontinuous Galerkin projection methods
… projection methods are further developed for ocean dynamics and geophysical fluid predictions. We investigate the effects of the HDG stabilization parameter for both the momentum equation as well as tracer diffusion. We also make a correction to our singularity treatment algorithm for nailing …
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Modeling the Effects of Low-Pressure Atmospheric Fronts on Sediment Transport through Mississippi Sound Barrier Island Inlets
… <p>A high-resolution application of the Regional Ocean Modeling System with the Community Sediment Transport Modeling System was developed to simulate tidal circulation, wind-driven currents, and sediment dynamics. Waves were excluded from the simulations. Model runs spanned 22 days per event, …
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3-D Modeling of Nearshore Circulation Using ROMS-SWAN: Model Upgrades and Evaluation
<p>Regional Ocean Modeling System (ROMS v 3.0), a three dimensional numerical model, was recently modified for shallow water applications by including wave induced radiation stresses provided through coupling with a wave propagation model (e.g., SWAN, REF/DIF). The coupled model has been applied to …
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Influence of the Indian Ocean Subtropical Dipole on the Agulhas current
… SIOD climatology was developed using a Regional Ocean Modeling System (ROMS) configured with GFDL-CORE v.2b reanalysis winds and heat fluxes for the 1958-2007 period. This configuration allows for a relatively accurate spatial and temporal account of the Sea Surface Temperature (SST) and Sea …
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High order hybrid discontinuous Galerkin regional ocean modelling
Accurate modeling of 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, …
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Representative Environments for Reduced Estimation Time of Wide Area Acoustic Performance
Advances in ocean modeling (Barron et al., 2006) have improved such that ocean forecasts and even ensembles (e.g., Coelho et al., 2009) representing ocean uncertainty are becoming more widely available. This facilitates nowcasts (current time ocean fields / analyses) and forecasts (predicted ocean …
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Time-optimal multi-waypoint mission planning in dynamic flow fields
… visits a number of locations in a given dynamic ocean current field. The missions demonstrated begin and end in the same location and visit a finite number of locations or waypoints in the minimal time; this problem bears close resemblance to that of the classic "traveling salesman," albeit with …
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The Impact of Stratified Ambient Water On Freshwater Transport In A River Plume
… freshwater transport in the plume. The Regional Ocean Modeling System (ROMS) is applied to conduct a parameter study, where the inflow freshwater flux, inflow salinity anomaly, ambient stratification and the bottom slope are varied systematically. Ambient water is thermally stratified. The …
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Fishery Interaction Modeling of Cetacean Bycatch in the California Drift Gillnet Fishery to Inform a Dynamic Ocean Management Tool
… Using 25 years (1990-2014) of National Oceanic and Atmospheric Administration fisheries’ observer data from the California drift gillnet fishery, we model the relative probability of bycatch (presence–absence) of four cetacean species in the California Current System (short-beaked common …
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Environmental influences on banana shrimps of the Sofala Bank, Mozambique Channel
… A high-resolution, nested, coastal, Regional Ocean Modeling System (ROMS) of the Sofala Bank is developed. In general, the model agrees well with available observations and literature. The ROMS outputs and self-organizing map analysis indicate that the shelf circulation, structure and river …
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Circulation of the Western Antarctic Peninsula: Implications for Biological Production
… This study focused on understanding the role of ocean circulation in providing retention/connectivity of wAP Antarctic krill populations and in maintaining biological hot spot regions. Numerical Lagrangian particle tracking simulations obtained from the Regional Ocean Modeling System (ROMS) …
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