内陆良态风与沿海台风风特性实测对比研究

Comparative Study on Field Measurement of Wind Characteristics Between Inland Normal Wind and Coastal Typhoon Wind

为了考察内陆良态风和沿海台风风速特性的不同,分别对武汉国际证劵大厦(总高331m)和广州利通广场大厦(总高303m)进行了建筑顶部风速现场实测。通过对典型风速的风速时程、湍流强度、阵风因子、风速功率谱、概率密度分布特性等方面的对比分析发现:内陆良态风风速波动情况表现为长周期小幅脉动,而沿海台风为短周期大幅脉动;内陆风湍流度和阵风因子与沿海台风基本一致;内陆风功率谱高频段能量相对偏低;沿海台风概率密度曲线与正态分布形状比较类似,但在均值附近密度曲线高而尖,峰度系数大于正态分布,而内陆风均值附近密度曲线则宽而低,峰度系数也大于正态分布。台风本身与良态风的风特性差别的原因与宏观地貌有很大关系。

To study the difference of wind characteristics between inland normal wind and coastal typhoon,field measurement of wind characteristics on the top of two tall buildings,namely,Wuhan International Securities Building and Guangzhou Litong Plaza Building,were conducted,by which the comparative analysis of wind speed time-history,turbulence intensity,gust factor,wind speed spectrum as well as probability density distribution were carried out.It was found that inland normal wind speed fluctuated around mean speed with long period and small magnitude,while wind speed of coastal typhoon fluctuated with short period and big magnitude;the turbulence intensity and gust factor of normal wind and typhoon was very close.The wind speed spectrum of typhoon was consistent with von Karman spectrum very well,but the energy in the high frequency section of inland normal wind speed spectrum is lower than Karman spectrum.The wind speed distribution near mean wind speed of typhoon is very high,displaying a narrower and higher peak,which is similar to normal gaussian distribution,but inland normal wind shows the opposite pattern.The kurtosis coefficients of inland normal wind and coastal typhoon are bigger than that of normal gaussian distribution.So it was concluded that difference of wind characteristics between inland normal wind and coastal typhoon is highly related to the macro landform.