广西钦州湾台风“启德”风场特征实测研究-气象研究与应用

文章信息/Info

Title:: Measurement on Wind-Field Characteristics of Typhoon “Kaitak” in Qinzhou Bay of Guangxi

作者:: 何如¹; 2; 周绍毅¹; 2; 苏志¹; 2; 李强¹; 2; 1. 广西气象服务中心, 南宁 530022;
2. 广西气候中心, 南宁 530022

Author(s):: HE Ru¹; 2; ZHOU Shaoyi¹; 2; SU Zhi¹; 2; LI Qiang¹; 2; 1. Guangxi Meteorological Service Center, Nanning 530022, China;
2. Guangxi Climate Center, Nanning 530022, China

Keywords:: Typhoon Kai-tak; measurement; fluctuating wind field; turbulence intensity

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。

Abstract:: 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?nd 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 313m, 224m and 163m 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.