摘要
基于2017年台风"海棠"和台风"纳沙"登陆近海山地时的实测数据,选取10 min平均风速≥10 m/s的强风样本,研究了平均风速、湍流度、阵风因子和地面粗糙度指数的变化规律,并分析了不同风速区间的风剖面和湍流剖面的变化规律。结果表明:台风登陆过程中风速时程呈双"M"型四峰分布,平均风向发生了260°的转变,10 m高度处湍流强度在0.15~0.34波动,并随地貌粗度指数增大有增大的趋势。实测得到风剖面和湍流剖面与规范GB 50009-2012进行了对比,不同高度处的平均风速变化符合指数率的变化趋势;两个测风塔实测得到台风风场的风剖面指数α均值为0.15和0.14大于季风风场的风剖面指数,接近GB 50009-2012中B类地貌规定值,但台风风场中的湍流强度剖面参数要大于GB 50009-2012中B类地貌规定参数值,该文结果可为近海山区工程结构抗台风设计提供参考。
Based on the field measured data during Typhoon "Haitang" and "Nesat" in 2017, the variation of mean wind speeds, turbulence intensities, and surface roughness exponents in coastal mountains were studied in the case of strong wind samples(10 min mean wind speed ≥10 m/s). And the variations of wind profile and turbulence profile in different wind speed intervals were also analyzed. The results show that the time history of wind speed during the two typhoons appears a double "M" type with four peaks. The time history of the mean wind directions changes about 260° during the two typhoons. Turbulence intensity fluctuates from 0.15 to 0.34 at the height of 10 m, which increases with the increasing of surface roughness exponents. The wind profile and turbulence profile during typhoons accord with the power law of Standard GB 50009-2012. Meanwhile, the power laws of wind profile measured by the two wind towers during typhoons are 0.15 and 0.14, respectively,which are close to the value of the exposure category B specified in Standard GB 50009-2012. The power laws of wind profile during typhoons are higher than the results during monsoon. And, the power laws of the turbulence intensity profiles during typhoons are larger than those stipulated in Standard GB 50009-2012. The results of this paper can provide reference for the design of engineering structures during typhoons in offshore mountainous areas.
作者
陈伏彬
翁兰溪
肖雁
李秋胜
CHEN Fu-bin;WENG Lan-xi;XIAO Yan;LI Qiu-sheng(School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hu’nan 410114,China;Powerchina Fujian Electric Power Survey&Design Institute Co.Ltd,Fuzhou,Fujian 350000,China;Department of Architecture and Civil Engineering,City University of Hong Kong,Hong Kong 999077,China)
出处
《工程力学》
EI
CSCD
北大核心
2021年第8期33-41,共9页
Engineering Mechanics
基金
国家自然科学基金项目(51778072)
国网福建省电力有限公司科技项目(SGTYHT/16-JS-201)。
关键词
台风
湍流度
平均风剖面
湍流剖面
实测
typhoon
turbulence intensity
mean wind profile
turbulence profile
field measurement
