Field measurement study on typhoon wind characteristics during strong wind periods

Based on the wind records of seven typhoons observed from 356-m-high Shenzhen Meteorological Gradient Tower (SZMGT) between 2017 and 2023, the differences and similarities of wind characteristics during strong wind periods for these typhoons are explored. The wind parameters, involving mean wind profile, turbulence intensity, turbulence integral scale, as well as gust and peak factors are presented and discussed. Moreover, Gaussianity, vertical coherence, and power spectral density are investigated. The results indicate that the strongest 10-min wind profiles for seven typhoons generally align with those recommended in codes and standards for suburban terrain at SZMGT, while the observed turbulence intensities during typhoons are markedly larger than those given for suburban terrain. The dispersion of turbulence integral scales for different typhoon events is more pronounced than that of turbulence intensity, however, a good consistency is observed in gust factors for seven typhoons. Compared with the Solari spectrum, the von Kármán spectrum can better describe the observed power spectra of longitudinal/lateral/vertical fluctuating wind speeds during strong wind periods. Furthermore, the fluctuating wind speeds overall show reasonable agreement with the Gaussian distribution. The outcome of this study is expected to provide a useful reference for wind-resistant design of building structures in typhoon regions.