An Examination of Tropical and Extratropical Gust Factors and the Associated Wind Speed HistogramsSource: Journal of Applied Meteorology:;2005:;volume( 044 ):;issue: 002::page 270DOI: 10.1175/JAM2199.1Publisher: American Meteorological Society
Abstract: A gust factor, defined as the ratio between a peak wind gust and mean wind speed over a period of time, can be used along with other statistics to examine the structure of the wind. Gust factors are heavily dependent on upstream terrain conditions (roughness), but are also affected by transitional flow regimes (specifically, changes in terrain and the distance from the upstream terrain change to the measuring device), anemometer height, stability of the boundary layer, and, potentially, the presence of deep convection. Previous studies have yielded conflicting results regarding differences in gust factors that might exist between winds generated by tropical cyclones and those generated by extratropical systems. Using high-resolution wind speed data collected from both landfalling tropical cyclones and extratropical systems, two databases of wind characteristics were developed. Gust factors from tropical cyclone and extratropical winds were examined, summarized, and compared. Further analysis was conducted to examine and compare the characteristics of the associated tropical and extratropical wind speed histograms. As expected, the mean gust factor was found to increase with increasing upstream surface roughness. Some differences were observed between data from the tropical environment and the extratropical environment. Mean gust factors from the tropical regime were found to be higher than mean gust factors from the extratropical environment within each roughness regime and the wind speed histograms generated from data from the two environments indicated some differences.
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contributor author | Paulsen, B. M. | |
contributor author | Schroeder, J. L. | |
date accessioned | 2017-06-09T16:47:26Z | |
date available | 2017-06-09T16:47:26Z | |
date copyright | 2005/02/01 | |
date issued | 2005 | |
identifier issn | 0894-8763 | |
identifier other | ams-74135.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4216327 | |
description abstract | A gust factor, defined as the ratio between a peak wind gust and mean wind speed over a period of time, can be used along with other statistics to examine the structure of the wind. Gust factors are heavily dependent on upstream terrain conditions (roughness), but are also affected by transitional flow regimes (specifically, changes in terrain and the distance from the upstream terrain change to the measuring device), anemometer height, stability of the boundary layer, and, potentially, the presence of deep convection. Previous studies have yielded conflicting results regarding differences in gust factors that might exist between winds generated by tropical cyclones and those generated by extratropical systems. Using high-resolution wind speed data collected from both landfalling tropical cyclones and extratropical systems, two databases of wind characteristics were developed. Gust factors from tropical cyclone and extratropical winds were examined, summarized, and compared. Further analysis was conducted to examine and compare the characteristics of the associated tropical and extratropical wind speed histograms. As expected, the mean gust factor was found to increase with increasing upstream surface roughness. Some differences were observed between data from the tropical environment and the extratropical environment. Mean gust factors from the tropical regime were found to be higher than mean gust factors from the extratropical environment within each roughness regime and the wind speed histograms generated from data from the two environments indicated some differences. | |
publisher | American Meteorological Society | |
title | An Examination of Tropical and Extratropical Gust Factors and the Associated Wind Speed Histograms | |
type | Journal Paper | |
journal volume | 44 | |
journal issue | 2 | |
journal title | Journal of Applied Meteorology | |
identifier doi | 10.1175/JAM2199.1 | |
journal fristpage | 270 | |
journal lastpage | 280 | |
tree | Journal of Applied Meteorology:;2005:;volume( 044 ):;issue: 002 | |
contenttype | Fulltext |