Nonstationary wind characteristics of typhoon Mangkhut
DUAN Jing1, ZHANG Li2, XIE Zhuangning1, LIU Muguang1
1.State Key Lab of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China;
2.Shenzhen National Climate Observatory, Shenzhen 518040, China
Abstract：On the basis of the wind speed records of the 356-m-high Shenzhen Meteorological Gradient Tower during typhoon Mangkhut passing, the time-varying average wind speed component is extracted with discrete wavelet transform (DWT) and 恩ensemble empirical mode decomposition (EEMD). The mean speed profile as well as the fluctuation characteristics such as turbulence intensity, gust factor, turbulence integral scale and fluctuating wind spectrum are analyzed, which are compared with those of stationary model(SMM). The results indicate that the measured mean wind speed profile of typhoon is slightly affected by stationarity, the terrain roughness exponent of strong wind period calculated by different methods approximate 0.22 stipulated in terrain category C of the Chinese Code. The fluctuating wind field parameters calculated by the involved methods are different. Turbulence intensity, gust factor, and turbulence integral scale are relatively smaller than those of SMM when non-stationarity considered，and the difference of turbulence integral scale is particularly significant. Turbulence intensity of SMM approximates the value stipulated in terrain category D of the Chinese Code. Turbulence integral scale of SMM is consistent with values of AIJ-2004, but is significantly smaller when non-stationarity considered. The fluctuating wind spectra calculated by SMM and EEMD is consistent with the Karman spectrum, while that of DWT is smaller at low frequencies. The EEMD method is relatively more reasonable than the DWT method in non-stationary analysis.
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