土木工程相关的台风近地风场实测研究

Field measurements of typhoons according to civil engineering research

采用三维超声风速仪现场观测了台风"珍珠"和"派比安"的登陆过程,分析了两次台风过程的平均风速、风向变化历程以及台风脉动风速的概率密度分布,进一步研究了台风湍流强度、湍流积分尺度与阵风因子.结果表明:在低风速情况下,台风脉动风速接近正态分布,湍流强度与阵风因子存在近似线性关系,可用相关经验公式进行拟合。两次台风过程实测风速谱均可与某种理论谱模型较好吻合,通过拟合可以降低实测谱与理论谱的偏差。

Time series of wind speed and wind direction data were full recorded by two kinds of 3-D anemometers installed on the observation tower during the passages of typhoon Chanchu and Prapiroon.The measured wind data are analyzed to obtain the information on mean wind speed and direction,turbulence intensity,gust factor and probability distribution of fluctuating wind speed.The selected results are presented and show that： the probability density functions of fluctuating wind speeds approximately follow the normal distribution under lower wind velocity;The gust factor is found to be linear with the longitudinal turbulence intensity.