ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 47 Issue 2 > 2021,47(2):143-156. DOI:10.7519/j.issn.1000-0526.2021.02.002 Prev Next
Analysis on Severe Wind Characteristics During Typhoon Rammasun Landing Process Based on the Observation at Wind Tower
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Abstract:
Based on the representative observation data obtained by the 90 m wind tower in Xilian Town, Xuwen County, Guangdong Province during the landfall of No.1409 Super Typhoon Rammasun, and the observation data of 100 m wind tower in Bohe Town, Maoming City, Guangdong Province, which is located in the periphery of the typhoon, the characteristics of the severe winds near surface layer are analyzed. The results of Xilian Tower show that time variations of the wind speed present clear “M” pattern. The wind direction counterclockwise deflects about 170° as the typhoon center passes through the tower. The wind speed increases with the increase of height, and the wind speed profile fits well with the laws of logarithm and power index. Wind shear index and roughness length decrease first and then gradually increase during the typhoon passing period. The wind shear index and roughness length on rough land underlying surface are large. The turbulence intensity and gust coefficient are larger in the front or back outer-vortex, but smaller in the front or back eye-wall. The turbulence intensity and gust coefficient decrease with the increase of height, which basically accords with the power law with negative exponent. The turbulence intensity and the gust coefficient are amplified under the influence of the rough underlying surface. The variation of the 10 min wind direction is more stable in the outer-vortex and eye-wall compared with that in wind eye in which it is rather intense. The maximum amplitude of the 10 min wind direction occurred when the wind speed reaches the minimum in the typhoon eye. The results of the Bohe Tower show that the situation is similar to that of the Xilian Tower when it is located in the front outer-vortex and the front eye-wall of the typhoon.
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P458，P412
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