上海陆家嘴地区近500m高空台风“梅花”脉动风幅值特性研究

Turbulence characteristics analysis of typhoon 'Muifa' near 500m above ground in Lujiazui district of Shanghai

上海环球金融中心高492m,在大厦顶部安装有2个超声风速仪,在近500m高度处的台风特性进行现场实测对华东地区风特性的研究有重要意义。对台风"梅花"影响下上海环球金融中心顶部的风速进行全程记录,分析湍流度、阵风因子和峰值因子等脉动风参数,纵向、横向和竖向湍流度均值分别为0.14、0.13和0.09;纵向、横向和竖向阵风因子均值分别为1.28、0.31和0.22;峰值因子均值为2.11。分析表明:湍流度、阵风因子和峰值因子随10min平均风速增大保持定值;阵风因子随湍流度的增大而增大,两者近似服从线性的关系;湍流度、阵风因子和峰值因子均随阵风持续时间的增加而减小,且减小速率逐渐减缓;台风登录时的湍流度和阵风因子的均值大于登录前的值,较高风速时段的横向湍流度和横向阵风因子的均值大于较低风速时段相的值。

Field measurement of typhoon near 500m above ground is significantly valuable to the research of wind characteristics in eastern China. During the passage of typhoon ＇ Muifa＇ , the wind speed data were recorded by the monitoring system assembled atop the Shanghai World Financial Center （SWFC）. In this paper, the characteristics of typhoon-generated wind including turbulence intensities, gust factors and peak factors are analyzed in detail. In the longitudinal, lateral and vertical directions, the mean value of turbulence intensities are 0.14, 0.13 and 0.09, respectively ; and the gust factors are 1.28, 0.31 and 0.22, respectively. The mean value of peak factor is 2.11. It is found that the turbulence intensities, gust factors and peak factors remain almost constant with the increase of mean wind speed. The gust factors increase with the turbulence intensities with an approximately linear pattern. The turbulence intensities, gust factors and peak factors decrease with the gust duration, and the rate of decrease exhibits a gradual decline. In addition, the turbulence intensities and gust factors during the landfall of the typhoon are greater than those before the landfall. The turbulence intensities and gust factors during high wind periods are greater than those during low wind periods in the lateral direction.