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 170 for “"Parameterizations"”.
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On Motion Parameterizations in Image Sequences from Fixed Viewpoints
This dissertation addresses the problem of parameterizing object motion within a set of images taken with a stationary camera. We develop data-driven methods across all image scales: characterizing motion observed at the scale of individual pixels, along extended structures such as roads, and whole …
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Assessment of mesoscale eddy parameterizations for coarse resolution ocean models
… climatological properties, the success of the parameterizations in representing the mesoscale eddies has not been investigated in detail. This thesis examines the role of eddies in a 105-years long basin scale eddy resolving simulation with the MIT General Circulation Model (GCM) forced by …
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Assessment of mesoscale eddy parameterizations for coarse resolution ocean models
… climatological properties, the success of the parameterizations in representing the mesoscale eddies has not been investigated in detail. This thesis examines the role of eddies in a 105-years long basin scale eddy resolving simulation with the MIT General Circulation Model (GCM) forced by …
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Exploring sensitivities of latent heat parameterizations using a coupled, integrated hydrologic model
… or in the atmosphere. Hydrologic models use parameterizations to represent the physical and physiological processes of evaporation and transpiration, respectively. These parameterizations assume some mathematical structure and require that values of certain parameters be assigned; however, …
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Effects of Microphysical Parameterizations and Drop Breakup on Supercells and Supercell Cold Pools.
… (Morrison and Milbrandt-Yau) microphysical parameterizations affect the supercell cold pool and the evolution of storm structure. Using in-situ data gathered by StickNet probes, the simulated cold pool can be objectively verified against the observations. This verification is done over the …
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Integrable symmetric fields in computational design : from stable woven shells to seamless parameterizations
Many problems in science and specifically in computer graphics, particularly in areas like geometry processing and computational fabrication, leverage a general toolkit that can be conceptualized as leveraging energy driven pattern formation to solve inverse problems. A large class of such problems …
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Mixing in stably stratified turbulent flows: improved parameterizations of diapycnal mixing in oceanic flows
… on this topic. This research focuses on improved parameterizations of diapycnal mixing through an integration of theoretical knowledge with observational and high resolution numerical simulation data. The main objectives are: (1) to provide a better assessment of field microstructure data and …
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An investigation of momentum exchange parameterizations and atmospheric forcing for the Coastal Mixing and Optics Program
… estimates, modifications to the traditional flux parameterizations are explored. Modification to the bulk aerodynamic method involves incorporating sea state dependence into the roughness length calculation. For the inertial dissipation method, a new parameterization for the dimensionless …
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Oceanic response observations due to passing tropical cyclones: an assessment of drag and sea spray parameterizations
… downwelling using 14 total forcing parameterizations, including seven different legacy or modern drag coefficients, with and without spray stress. A combination of qualitative and statistical analyses illustrated downwelling was present in Hurricane Ignacio and every other storm by a …
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An investigation of momentum exchange parameterizations and atmospheric forcing for the Coastal Mixing and Optics Program
… estimates, modifications to the traditional flux parameterizations are explored. Modification to the bulk aerodynamic method involves incorporating sea state dependence into the roughness length calculation. For the inertial dissipation method, a new parameterization for the dimensionless …
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Oceanic response observations due to passing tropical cyclones : an assessment of drag and sea spray parameterizations
Most traditional theories regarding upper oceanic response due to passing tropical cyclones involve an initial and predominant upwelling based on storms' strong cyclonic flow and resulting positive wind stress curl imparted on the sea surface. In August 2015, Air-Launched Autonomous Micro Observer …
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Evaluations of microphysical parameterizations in retrieval algorithms for snowfall particle size distributions from dual frequency radar measurements
… evaluate the effects of improved microphysical parameterizations on simulations and retrievals of microphysical properties from particle size distributions and radar measurements, respectively. It is seen that only mass-diameter relationships with varying densities are able to recreate measured …
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Data-driven ocean modeling using neural diferential equations
… unresolved scales via surrogate models known as parameterizations. However, these parameterizations have limited fdelity and can exhibit structural defciencies. In this thesis, we attempt to develop new data-driven parameterizations of oceanic turbulence with better predictive skill than the …
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Parametric Coordination in Hierarchical Computation of Decentralized Controls
… decentralized gains based on infimal problem parameterizations. Several parameterizations are presented and illustrated with numerical examples. The algorithm and the parameterization lead to simpler supremal problems and significant reduction in computational requirements as compared with …
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Gravity Wave/large-Scale Flow Interactions: A Comparison of Model Predication and Observation
… predicted by three commonly used gravity-wave parameterizations: critical level filtering, linear saturation filtering, and diffusive filtering. A one-dimensional, time-independent model filters various gravity-wave spectra using the criteria for each of these parameterizations. Background wind …
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Analysis of Net Primary Production Models and Observations in the Tropical Pacific Ocean and Their Relationship with Fisheries Yield
… Ocean, and how uncertainties in physiology parameterizations and in field primary production measurements used in the models’ formulations limit model skill. I find that primary production model choice has an effect on designating sustainable fisheries levels, that model parameterizations …
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Constrained parameterization with applications to graphics and image processing.
… always result in triangle flipping in parameterizations (also called foldovers). Additionally, distortion is inevitable in parameterizations. Thus the rigid constraint is always taken into account. In general, the constraints are application-dependent. This thesis thus focuses on the …
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Experimental and numerical investigation of turbulence in Stable Boundary Layer flows
… number, but usually overlooked in turbulence parameterizations. For this purpose, an experimental dataset previously collected over an Alpine glacier is used, with a focus on the anisotropy of the Reynolds stress tensor, as the scientific community has recently shown improvements in the …
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Quantitative Stratigraphic Inversion
… need for several different diffusion-coefficient parameterizations to emulate different erosional and depositional processes. The excellent result of the piecewise inversion, which used different parameterizations for different time intervals, demonstrate the need for development or incorporation …
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