Field measurement study on wind structure characteristics of specific topography under typhoon Maria
(2.Department of Physics, Zhejiang University, China, Hangzhou, Zhejiang Province, China 310000)
(3.Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan University, China, Changsha, Hunan Province, China 410082)
【Abstract】Based on the measured wind speed data of a Doppler sodar in the observation point A and an anemometer at the top of the lab building B in Wenzhou, Zhejiang Province, China under typhoon Maria in 2018, according to logarithmic law, exponential law, D-H model theory, and hypothesis testing methods in statistics, we studied the variations of the horizontal and vertical wind profile curves and came to the following conclusion. Firstly, the linear regression analysis of mean wind speed on two measured points at same height with a distance of 6.21 km under different landscape achieved highly correlation. Faster wind speed and shorter periods led to higher correlations. Secondly, the fitting curve of the horizontal wind profile was quite close to the exponential law model in the influence period and tended to be the D-H model in the stable period. The fitting roughness index of wind profile decreased significantly with the growth of the horizontal mean wind speed. Thirdly, the mean value of the boundary layer height obtained from the calculation of the wind profile sample was 1,421 m, which was 3.06 times more than the standard value and 1.78 times more than the calculation value of normal wind. Lastly, the vertical mean speed varied intensely compared to that in the horizontal direction. The fitting roughness index of wind profile increased with the growth of the vertical mean speed.
【Keywords】 typhoon; wind profile; boundary layer height; exponential law; correlation;
(Translated by WEN JX)
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