上海环球金融中心顶部台风“灿鸿”风速实测

Field Measurement of Wind Characteristics of Typhoon Chanhom on Shanghai World Financial Center

摘要:

基于上海环球金融中心顶部(494 m)采集到的台风“灿鸿”风速数据，对平均风速、湍流强度、阵风因子和峰值因子进行了分析.用广义风速谱拟合的方法计算湍流积分尺度，运用拟合参数将风速谱与Von Karman谱进行对比.研究结果表明：10 min最大平均风速与1 h平均风速，3 s最大平均风速与10 min平均风速均有较好的线性关系；顺风向和横风向阵风因子与湍流强度之间都满足线性关系；顺风向和横风向湍流积分尺度随10 min平均风速的增加而增加；本次实测得到的风速谱与Von Karman谱有一定差距.

关键词:台风“灿鸿”; 现场实测; 湍流积分尺度; 风速谱拟合

Abstract:

Based on the measured data of typhoon Chanhom recorded atop Shanghai World Financial Center (494 m), the wind characteristics, such as mean wind speed, turbulence intensities, gust factors, and peak factors were analyzed. Turbulence integral scales were calculated by fitting a general spectral form to the measured wind velocity data. Wind speed spectra were compared with Von Karman spectra by using fitting parameters. It is shown that the correlation between the maximum 10 min mean wind speeds within 1 hr and the 1 hr mean wind speed, as well as that between the maximum 3 s mean wind speeds within 10 min and the 10 min mean wind speeds, both have a good linear relationship; the longitudinal and lateral gust factors are both linear with the turbulence intensities; the longitudinal and lateral turbulence integral scales increase as the mean wind speeds increase; and there exist some differences between the measured wind speed spectra and the Von Karman spectra.

Key words:typhoon Chanhom; field measurement; integral length scale; fitting wind speed spectrum