In this paper, the wind characteristics of typhoon ‘Muifa’ such as wind speed, wind direction, variations of gust factors with gust averaging time, probability distribution of fluctuating wind speed, auto-correlation curves and cross-correlation coefficients between the wind speed fluctuation components are discussed on the basis of long time measured data which is recorded respectively at the height of 10m, 20m, 30m and 40m above the ground in Pudong Shanghai. Firstly，for low-wind-speed regime(U<12m/s), observed values of longitudinal gust factor for different gust averaging time are consistent with that obtained by Durst, but agree well with that proposed by Krayer-Marshall for high-wind-speed regime(U>12m/s). It is shown that estimated values of gust factors for lateral and vertical fluctuation components at observation height of 10m are significantly larger than those at observation height of 20m and 40m when the gust averaging time is less than 100s and 10s, respectively. Next, the probability density function of fluctuation wind speed of this typhoon follows a Gaussian distribution. Finally, it can be found that decay rate of auto-correlation curves for longitudinal and lateral fluctuation components decrease with the increase of observation heights, and the empirical formulas are also obtained using least-square fitting technique. Cross-correlation coefficients stay almost constant when wind speed becomes high
WANG Xu HUANG Peng GU Ming.
Field measurement of typhoon characteristics near ground in Shanghai district[J]. Journal of Vibration and Shock, 2012, 31(20): 84-89
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