温州地区近地强风特性实测研究

为研究我国沿海地区的近地强风特性，基于设置在温州大学的风场观测点(离地约30m高)，对台风“海鸥”影响温州时的风场状况进行了监测，获取了台风期间近地风场的实测数据。通过对台风影响过程的风速和风向、湍流度、阵风因子、湍流积分尺度、脉动风速功率谱密度函数和空间相干性等参数的分析，研究了台风“海鸥”影响温州时的近地风场特性。结果表明：台风“海鸥”的湍流度和阵风因子较大，顺风向和横风向湍流度接近；顺风向与横风向湍流积分尺度的均值分别为70.4m和66.6m；实测风速谱与von Karman谱基本符合；实测两点的脉动风速空间相干系数在零频率处与Shiotami经验公式计算结果一致。

Field measurements of strong wind characteristics near ground in Wenzhou district

Based on the field measurement of wind characteristics on the wind observation point(placed at the height of 30m) in Wenzhou University during the passages of Typhoon Kalmaegi, this paper presented selected measured datum. Detailed analysis of the field datum was conducted to investigate the boundary layer wind characteristics, such as wind speed and direction, turbulence intensity, gust factor, turbulence integral length scale, power spectral density of fluctuating wind speed and spatial coherence of measured wind data. The results clearly demonstrate that the turbulence intensity and gust factor of Typhoon Kalmaegi are larger than normal, and the longitudinal turbulence intensity is very close to the lateral turbulence intensity. The longitudinal and lateral turbulence integral length scale are 70.4m and 66.6m respectively, and the power spectral densities of measured wind speed roughly fit with von Karman spectra. The measured spatial coherence is consistent in the zero frequency point with the Shiotami empirical formula computed result.