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 27 for “"Model Resolution"”.
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The Effect of Digital Elevation Model Resolution on Wave Propagation Predictions at 24Ghz
Digital Elevation Models (DEMs) are computer-generated representations of the earth's surface. These surfaces can be used to predicted Line-of-Sight (LOS) radio propagation. DEM resolution can affect the results of this prediction. This study examines the effect of DEM resolution on accuracy by …
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Constraining black carbon emission inventories with observations
… and comprehensive emission information for modeling studies. This work develops a method to constrain the historical BC emission inventory for the U.S. from 1960 to 2000 based top-down constraints (ambient observations) and bottom-up constraints (emission measurements). Measurements of BC …
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Application of the Weather Research and Forecasting (WRF) Model to Simulate a Squall Line: Implications of Choosing Parameterization Scheme Combinations and Model Initialization Data Sets
… forecasting for public safety. Mesoscale Modeling plays an important role in any forecast of a potential squall line. The focus of this study was to examine the performance of several parameterization scheme combinations in the Weather Research and Forecasting Model version three (WRF) as …
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Simulating and quantifying land-surface biogeochemical, hydrological, and biogeophysical processes using the Community Land Model version 4
… and decomposition. Terrestrial biogeochemistry models typically require hundreds to thousands of years for carbon and nitrogen in various pools to reach steady-state solutions, which are generally a function of soil temperature and soil water. Hydrological processes such as the root …
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Synoptische, diagnostische und numerische Untersuchungen der Intensitätsänderungen von tropischen Wirbelstürmen und Monsuntiefs
… analyses, diagnostic studies, and numerical model calculations. The analyses are based on gridded data from the Australian Bureau of Meteorology’s (BMRC’s) Tropical Analysis System, the European Centre for Medium-Range Weather Forecasts (ECMWF) data archive, and the 1990 Tropical Cyclone …
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The role of demand uncertainty in materials selection : a case study on aluminum recycling
… this study. The two stage recourse optimization model presented in this thesis aims to provide batch planners with a tool to effectively manage raw materials in an uncertain demand environment. This model enhances existing research by increasing the number of demand scenarios considered by an …
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Temporal and Geographical Variation in Martian Surface Dust Lifting Processes
… investigated using a Martian Global Circulation Model. The geographical representation of Martian dust lifting by wind stress was used to explore the experimental impact of changes in model resolution. It was found that increasing the resolution improved the model's geographical representation of …
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A study of impact breakage of single rock specimen using discrete element method
… Numerical techniques such as the Bonded Particle Model-Discrete Element Method (BPMDEM) have been developed as a means of investigating in isolation, the effects of different factors on ore breakage behaviour under closely controlled breakage conditions using synthetic rock specimens. This study …
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Strong wind events across Greenland’s coast and their influence on the ice sheet, sea ice and ocean
… the atmospheric Weather Research and Forecast Model show that mountain wave dynamics contribute to the acceleration of the downslope flow. In order to capture these dynamics, a high model resolution with a detailed topography is needed. The effects of using a different resolution locally in the …
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COHERENT DETECTION OF SCATTERED LIGHT BY SUBMICROMETER AEROSOLS.
… An optical inspection region is given by the resolution limited blur spot diameter and depth of focus of the gathering lens. Particles scattering outside this zone will not contribute to measured phase signals. Calculations show that COPS can count in concentrations of 10('9) particles per …
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Modeling nighttime chemistry with WRF/chem: sensitivity to vertical resolution and boundary layer parameterization
… of nighttime chemistry and poses an important modeling challenge. In this work we explore the sensitivity of the model results for N2O5 and aerosol nitrate to different existing planetary boundary layer parameterizations within the WRF-Chem model, as well as the sensitivity to model resolution …
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North American monsoon precipitation and its precursors: processes at the seasonal and diurnal scale
The Weather Research and Forecasting (WRF) model was run at 100~km, 25~km, and 10~km resolution for the 2000 and 2004 monsoon seasons (July-September), a dry year and a wet year. These years were chosen to represent contrasting precipitation outcomes to assure that results were robust across …
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Near and far field models of external fluid mechanics of Ocean Thermal Energy Conversion (OTEC) power plants
… so far primarily physical and analytical models have been developed. In this study numerical models are developed to model OTEC operating plants: integral models for the near and intermediate field and a large-scale ocean general circulation model. Two strategies in modeling OTEC plant …
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Strong wind events across Greenland's coast and their influence on the ice sheet, sea ice and ocean
… the atmospheric Weather Research and Forecast Model show that mountain wave dynamics contribute to the acceleration of the downslope flow. In order to capture these dynamics, a high model resolution with a detailed topography is needed. The effects of using a different resolution locally in the …
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Sea Spray-Mediated Fluxes at Extreme Wind Speeds
… systems that are challenging to forecast and model. Since tropical cyclones are powered by the warm ocean surface, the accuracy of intensity forecasts depends heavily on the air-sea interaction scheme. However, at extreme wind speeds the air-sea transition layer becomes replete with sea spray …
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The Decorrelation Length and Time Scale - Diagnostic Tools to Visualize Spatial and Temporal Variability in Geophysical Fields
Atmospheric reanalyses and model data are becoming more commonly used. However, most reanalyses and global climate models have resolutions of ~50 km or lower --- scales too coarse to capture many topographic and coastal effects within various geophysical fields such as precipitation and wind speed. …
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Use of Lidar Data to Investigate the Influence of Bottom Friction Coefficients for Storm Surge Modeling of Hurricane Michael in the Florida Panhandle
<p>Current storm surge modeling typically uses local land use land cover (LULC) maps coupled with lookup tables to parameterize surface roughness because the process is defensible and easily automated at the regional scale. However, this is not a truly accurate method since LULC data is generalized …
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Spatial and temporal estimation of pumping and recharge in groundwater system analysis
… supplied by the Chicot aquifer. Numerical flow models are useful for managing and optimizing groundwater systems. However, many important model parameters are difficult to quantify, exhibit a certain degree of uncertainty, and may vary both spatially and temporally. Two of the most important and …
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An analysis of geothermal viability in Pecos County, Permian Basin, West Texas
… are used to construct a Pecos County heat flow model and four temperature-at-depth models (3.5, 5.0, 6.5, and 10.0 km depths), using 947 data points available in Pecos County. Wells are distributed throughout the county, with higher well densities occurring in the north, northeast, and …
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