厦门海岸地区150m高空台风风场特性实测研究

Research on measurements of typhoon wind field characteristics at 150m altitude in Xiamen coastal area

基于安装在厦门海岸地区超高层建筑顶部的测风基站(150m),对2010年前后四次台风历程的风场数据进行实测。基于实测数据,研究分析了表征台风特征的平均风速、平均风向角、湍流度、阵风因子、湍流积分尺度、功率谱等风场参数。结果表明:实测风场的湍流度及阵风因子随平均风速的增大平稳变化,湍流度及阵风因子随平均风速增大而减小;阵风因子随湍流度的增大而增大,并符合线性关系;拟合的湍流积分尺度均相对于规范值偏小;实测顺风向脉动风速功率谱均与Von Karman谱在低中频吻合较好,在高频处Von Karman谱偏小。

Based on the wind measurement base station(150 m) installed on the top of the super high-rise building in the Xiamen coastal area, the wind field data of the four typhoon history around 2010 was measured. From measured data, the wind field parameters such as the average wind speed, average wind direction angle, turbulence scale, gust factor, turbulence integral scale, power spectrum and other parameters that characterize the typhoon were analyzed. The results show that the measured turbulence scale and gust factor of the wind field change smoothly with the increase of the average wind speed, and the turbulence scale and gust factor decrease with the increase of the average wind speed. The gust factor increases with the increase of the turbulence scale, and is in a linear relationship. The fitted turbulence integral scale is smaller than the normative value. The measured longitudinal power spectrum of pulsating wind speed along the downwind direction is consistency with the Von Karman spectrum within low and intermediate frequencies, and the Von Karman spectrum is relatively small within high frequencies.