摘要
利用在广西钦州湾设立的一座55m高测风塔上的超声风观测仪器,收集到台风"启德"影响过程的脉动风数据,对湍流脉动风场特征参数进行了分析研究,结果表明:(1)台风"启德"影响期间观测到的最大风速为26.0m·s-1,过程风向由北风转向东北风、东风,过程转向幅度最大为157°,风攻角绝大部分在±3°范围内;(2)三维方向的湍流强度平均值比值为1:0.73:0.50,湍流积分尺度分别为313m、224m、163m,表现为均匀平稳的湍流变化过程;(3)湍流功率谱在惯性副区内基本满足-5/3律,其斜率随着风速的增大有减小的趋势。
Based on the field measurements, which is measured by the observation instruments of ultrasonic anemometer on a 55m-height wind tower in Qinzhou Bay of Guangxi, of the fluctuating wind field of Typhoon Kai-tak, the characteristics were analyzed. The results show that：（ 1） the maximum observed wind speed is 26.0 m·s^-1; the wind direction turned from N to EN and then to E with the maximum turning range of 157°and most of the wind attacking angel within ±3°.（2） The average ratio of turbulence versus in 3 D direction is 1：0.73：0.50, the turbulence integral scales are 313 m, 224 m and163m respectively with even and stable turbulence variation.（ 3） The turbulence power spectrum obeys the well-know-5/3 power law in inertial subrange, the slope of which appears a decreasing trend with the increasing the wind speed.
出处
《气象研究与应用》
2015年第4期34-37,I0002,共5页
Journal of Meteorological Research and Application
基金
广西自然科学基金青年基金项目(2015GXNSFBA139189)
关键词
台风“启德”
现场实测
脉动风场
湍流强度
Typhoon Kai-tak
measurement
fluctuating wind field
turbulence intensity
