【作者】 史文海； 李正农； 张传雄；

【Author】 Shi Wenhai~(1,2) Li Zhengnong~2 Zhang Chuanxiong~(1,2) (1.School of Architectural and Civil Engineering,Wenzhou University,Wenzhou 325035,China; 2.School of Civil Engineering,Hunan University,Changsha 410082,China)

【机构】 温州大学建筑与土木工程学院； 湖南大学土木工程学院；

【摘要】 2008年7月利用离地约30m高处的两台机械式风速仪,采集得到了台风"海鸥"的近地风场数据。详细分析了台风"海鸥"的阵风因子、湍流强度、湍流功率谱密度函数和空间相关性等湍流特性。结果表明台风"海鸥"的近地风场湍流度和阵风因子较大,实测脉动风的功率谱密度函数在顺风向与横风向与Von Karman谱基本符合。实测两点脉动风速空间相关系数小于Davenport经验公式的计算结果,但在零频率处与Shiotami经验公式计算结果基本一致。更多还原

【Abstract】 This paper presents field measurement results of boundary layer wind characteristics over typical open country during the passages of Typhoon Kalmaegi in July 2008.The field data were measured from two propeller anemometers placed at the height of 30m.The measured wind data are analyzed to obtain the information on turbulence intensity,gust factor,spectra of wind speed fluctuations and co-coherence of measured wind data.The results clearly demonstrate that the turbulence intensity and gust factor of strong wind are larger than normal,and the power spectral densities of fluctuating wind speed in longitudinal and lateral directions obtained from the measured wind speed data roughly fit with Von Karman spectra.The measured co-coherence is smaller than the exponential function calculated results recommended by Davenport,but is consistent in the zero frequency point with the Shiotami empirical formula computed result.更多还原