Surface layer wind field characteristics during a severe typhoon 'Hagupit' landfalling

Based on field measurements of wind effects on a low-rise building, during typhoon Hagupit, the paper presented selected field measured data. The characteristics of wind speed, wind direction, gust factor, turbulence intensity, turbulence scale and spectra were discussed in detail. The measurement arrangements for the wind pressures on the low rise building were also introduced in the paper. The results show that, the instantaneous maximum wind speed was 56.7 m/s, 10-minitues mean wind speed 40.2 m/s. The higher was the wind speed, the lower values were the turbulence intensity and the gust factor. Before Typhoon 'Hagupit' landfalling, the wind speed and wind direction were fluctuated remarkably. After 'Hagupit' landfalling, the turbulence intensity, the gust factor and the turbulence integral length scale became smaller obviously; and the measured wind speed spectra were in good agreement with von Karman spectrum. The outputs of this study are very useful for further understanding of the characteristics of wind field during severe typhoon, it is also expected that the results presented in this paper should be valuable for wind-resistant design of low-rise buildings.