基于阵列风速仪实测的台风“苏迪罗”近地风场空间相关性研究  

Research on spatial correlation of near-ground wind field of typhoon"Sudiro"based on array anemometer measurements

作　　者：张建国[1] 刘哲瑄 雷鹰[1] ZHANG Jianguo;LIU Zhexuan;LEI Ying(School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学建筑与土木工程学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2024年第3期504-511,共8页Journal of Xiamen University：Natural Science

基　　金：福建省自然科学基金(2018J01085)。

摘　　要：[目的]针对沿海区域近地台风风场的空间相关性问题进行研究.[方法]根据阵列风速仪实测的台风“苏迪罗”风速风向数据,选取4个稳定时段的288个风速样本,对台风近地风场的空间相关性进行详细的分析.首先定性研究平均风速和风向角对顺、横风向、垂直方向脉动风速的竖向和水平互相关系数的影响,然后分析平均风速和风向角对3种脉动风速竖向和水平相干函数的影响,最后对顺风向竖向相干函数、顺风向水平相干函数和横风向水平相干函数进行公式拟合,获得相关参数的取值.[结果]平均风速对顺、横风向的竖向和水平互相关系数及相干函数有一定影响,平均风速越大,相应的互相关系数和相干函数也随之增大;风向角对3种脉动风速的竖向相关性影响不大,但对顺、横风向的水平互相关系数和相干函数影响较大;各种相干函数在零频率处(f=0 Hz)的数值大都小于1.0,零频率处的数值随距离与平均风速的比值呈指数衰减规律;顺风向竖向相干函数、顺风向水平相干函数和横风向水平相干函数随距离与平均风速比值的衰减系数分别为9.3 f+0.38,3.1 f+0.18,3.2 f+0.16.[结论]基于阵列风速仪实测的近地台风数据,分析得到了台风风场的空间相关性特性,竖向和水平的互相关系数和相干函数,给出的拟合公式可用于大跨度空间结构和桥梁结构的动态响应分析计算,可有效评估工程结构的抗风安全性.[Objective]Characteristics of spatial correlation of near-ground typhoon constitute important parameters to calculate wind-induced dynamic response of engineering structures,such as long-span roofs and bridges.Based on wind field measurements with matrix-layout anemometers during the landfall of typhoon"Sudiro",the spatial correlation of typhoon wind fields near coastal areas is investigated.[Methods]Based on the measured wind speed and direction data of typhoon"Sudiro"using array anemometers,288 wind-speed samples from four stable periods were selected to conduct a detailed analysis of the spatial correlation of the typhoon s near-ground wind field.First,the influence of average wind speed and wind direction angle on the vertical and horizontal cross-correlation coefficients of fluctuating wind speed in the clockwise,crosswind,and vertical directions was qualitatively studied.Then,the influence of average wind speed and wind direction angle on vertical and horizontal coherence functions of three types of fluctuating wind speeds was analyzed.Finally,formulae were fitted for the vertical coherence function in the clockwise direction,the horizontal coherence function in the clockwise direction,and the horizontal coherence function in the crosswind direction,and values of relevant parameters were given.[Results]The average wind speed exerts a certain influence on vertical and horizontal cross-correlation coefficients and coherence functions in clockwise and crosswind directions.The higher the average wind speed reaches,the greater the corresponding cross-correlation coefficients and coherence functions become.The wind direction angle exerts little effect on the vertical correlation of three types of fluctuating wind speeds,but executes a greater impact on the horizontal cross-correlation coefficient and coherence function in clockwise and crosswind directions.Values of various coherence functions at zero frequency(f=0 Hz)are mostly less than 1.0,and those at the zero frequency exhibit an exponential decay with the r

关 键 词：台风实测 阵列布置 风速仪 互相关系数 相干函数 

分 类 号：TU317.2[建筑科学—结构工程]