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.
Results
Showing 1 to 20 of 77 for “"Wind shear"”.
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Radar turbulence estimates : effects of wind shear and reflectivity factor gradients
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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Radar-derived Thermodynamic Structure of a Major Hurricane in Vertical Wind Shear
… pressure and temperature fields along with the wind and precipitation structure of Hurricane Rita emphasize the impact of vertical wind shear on the azimuthal location of convection in the eyewall and show the dynamic and thermodynamic processes that act to balance the vortex tilt. Analysis of …
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Wind shear and differential upwelling along the South Western tip of Africa
… (30-35° S, 17-20° E) topographic irregularities shear the wind stress field giving rise to coastal upwelling with an alongshore variability. The relationship between wind shear and differential upwelling is established using a blend of oceanographic and meteorological investigations. Mesoscale …
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The Numerical Simulation of Thunderstorm Outflow Dynamics (Gust Front, Kelvin-Helmholtz Instability, Wind Shear, Microbursts)
Two high-resolution, two-dimensional numerical models are developed and used to investigate the dynamics of thunderstorm outflows. The first model employs the set of unapproximated, inviscid, fully compressible hydrodynamical equations, while the second, more economical model is based on a …
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An examination of the large-scale drivers of North Atlantic vertical wind shear and seasonal tropical cyclone variability
… tropical North Atlantic deep-layer vertical wind shear (VWS). VWS is a key variable for the seasonal prediction of tropical cyclone (TC) activity and can be used to assess sources of predictability within a given season. Part 1 of the dissertation examines tropical versus subtropical impacts …
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The Association of Strong Near-Surface Wind Shear Profiles with Enhanced Probabilities of Significant Severe Weather and Tornado Events.
… near surface (< 1 km AGL) speed and directional shear has been noted in pre-tornadic vertical wind profiles. This combination consists of intense speed shear followed by intense directional shear between the surface and 1 km AGL, which appears as a sickle-shape on a hodograph. A composite …
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Sea Surface Temperatures and Vertical Wind Shear as Precursors to Tropical Cyclone Activity in the Caribbean and an Expanding Main Developing Region
<p>Sea surface temperatures and vertical wind shear are essential to tropical cyclone formation. TCs need warm SSTs and low shear for genesis. Increasing SSTs and VWS changes influence storm development. This work analyzes SST and VWS trends for the Caribbean, surrounding region, and the Atlantic …
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Impacts of cold pool strength on tornado production in quasi-linear convective systems
… particularly with instability and vertical wind shear. However, such studies have been limited to cases from field projects and thus exhibit a small domain and sample size. To bridge this gap, this study investigates cold pool strength and pre-convective line vertical wind shear for 94 …
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Development and Deployment of a Dynamic Soaring Capable UAV using Reinforcement Learning
… be gained by flying through regions of vertical wind gradient such as the wind shear layer. With reinforcement learning (RL), a fixed wing unmanned aerial vehicle (UAV) can be trained to perform DS maneuvers optimally for a variety of wind shear conditions. To accomplish this task, a 6-degreesof- …
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The effects of entrainment in the developing and rotating stages of supercell thunderstorms
… cumuli in environments with minimal vertical wind shear. Little attention has been given to investigating the entrainment into developing thunderstorms growing in environments with strong vertical wind shear, or to how rotating updrafts in some thunderstorms (i.e. supercells; produced in …
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Effects of environmental shear and buoyancy on simulated supercell interactions
… examines the role that buoyancy and vertical wind shear play in modulating the relationship between storm interactions and storm severity. Using an idealized numerical model, 240 supercell interactions are simulated under systematically varied amounts of buoyancy and vertical wind shear. Small …
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The Role of Environmental Moisture on Tropical Cyclone Size and Structure
… of TC impacts and is influenced by environmental wind shear and the overall moisture environment. Since initial TC size is related to future TC size, research focused on understanding the influences of TC size away from land can lead to a more complete understanding of the extent of coastal …
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Design and Flight-Path Simulation of a Dynamic-Soaring UAV
… designed to include the effects of atmospheric wind conditions. A simple flight control system aids in the development of the dynamic soaring maneuver. A modular design paradigm is adopted for the aircraft dynamics model, which makes it conducive to use the same environment to simulate other …
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Quantifying entrainment and dilution in numerical simulations of developing thunderstorms
… that in environments with significant vertical wind shear, the down-shear circulation is stronger. It has been hypothesized that greater entrainment (and thus dilution) occurs in stronger shear environments, but this relationship has not been suitably demonstrated with direct calculations of …
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THE APPLICATION OF THE MARSUPIAL AND ROTATING CONVECTION PARADIGMS TO UNDERSTANDING THE TROPICAL CYCLOGENESIS AND INTENSIFICATION OF HURRICANE MICHAEL (2018)
… conditions, including strong vertical wind shear and the absence of classic Cape Verde–type characteristics. Data from the NOAA Global Forecast System (GFS), NOAA satellite imagery, and upper-air soundings are analyzed to investigate precursors to the storm’s formation. Results suggest …
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A theory of the mesoscale organization of moist convection and the associated vertical momentum transport
… between the updraft and the environmental wind. The orientation, aspect ratio, phase speed and size of the organized convection are determined. These quantities depend on the vertical wind-shear and the stratification. GATE, ARM, EMEX, SCSMEX, and TOGA COARE data are used to test the …
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A Dynamical Study of Gravity Waves and Instabilities in the Mesopause Region at Maui, Hawaii
… double-layer structure of large N2/strong wind shear. It is found, using the GROGRAT model, that tidal modulation has two effects on the wave propagation: (1) wave breaking levels descend at a tidal phase. (2) breaking levels for oppositely-propagating waves are separated by ∼10 km. The …
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Modeling Of Atmospheric Refraction Effects On Traffic Noise Propagation
… for predicting atmospheric refraction shows that wind direction is a significant parameter and should be included in future modeling for atmospheric refraction. To accomplish this, the model includes a "wind shear" and "lapse rate" terms instead of wind speed and temperature as previously needed …
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Effects of atmospheric profiles on local infrasound propagation
… focuses on simplified vertical temperature and wind profiles up to 20 km altitude and their effect on an infrasonic signal emanating from an arbitrary point source. A wide-angle, finite-element infrasound propagation model that correctly handles discontinuities in wavenumber is used for …
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