摘要
为了研究与风载荷密切相关的城市大气边界层湍流的垂直分布特征,利用北京325m气象铁塔的不同高度一年四季的湍流观测数据进行统计分析,重点对比分析了湍流强度剖面实测值和推算值。结果表明:采用《建筑结构荷载规范》(GB 50009-2012)推荐的10m湍流强度和风廓线幂指数得到的湍流强度剖面推算值明显小于考虑了小风情况的实测值,荷载规范推荐参数不适用于发达城市边界层湍流强度剖面推算;采用实测风廓线幂指数和城市冠层内8m湍流强度实测值得到的湍流强度剖面推算值与实测值的相对误差达20%以上;采用实测风廓线幂指数和城市冠层之上的47m湍流强度实测值得到的湍流强度剖面推算值与实测值的相对误差小于9%。因此,以城市冠层之上的湍流强度实测值和实测风廓线幂指数为基础推算湍流强度剖面的方法能够得到比较接近于实测值的结果,此推算方法具有可行性与可靠性。
In order to study the vertical distribution characteristics of urban atmospheric boundary layer turbulence which is closely related to wind load,the statistical analysis was performed on the turbulence observation data at different heights of Beijing 325m Meteorological Tower throughout the four seasons.The measured and extrapolated value of turbulence intensity profile were compared and analyzed.The results show that the extrapolated results of the turbulence intensity profile obtained by using the 10m turbulence intensity and wind profile power exponent recommended by Load code for the design of building structures(GB 50009-2012)are obviously less than the measured values considering light wind conditions.The recommended parameters are not suitable for the extrapolation of the turbulence intensity profile in developed urban boundary layer.The relative error between the measured values and the extrapolated values of turbulence intensity profile using the measured wind profile power exponent and the measured value of turbulence intensity at 8m(within the urban canopy)is more than 20%.The relative error between the measured values and the extrapolated values of turbulence intensity profile using the measured wind profile power exponent and the measured value of turbulence intensity at 47m(above the urban canopy)is less than 9%.Therefore,the method of extrapolating the turbulence intensity profile based on the measured values of turbulence intensity above the urban canopy and the measured wind profile power exponent can obtain results that are relatively close to the measured values.This calculation method is feasible and reliable.
作者
丁伟宸
师宇
刘磊
胡非
DING Weichen;SHI Yu;LIU Lei;HU Fei(State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《建筑结构》
北大核心
2024年第13期71-80,共10页
Building Structure
基金
国家自然科学基金青年项目(42105093),国家自然科学基金面上项目(42175101)。
关键词
湍流强度
风廓线
高塔
城市边界层
turbulence intensity
wind profile
meteorological tower
urban boundary layer
作者简介
第一作者:丁伟宸,博士,主要从事大气边界层物理和大气湍流研究,Email:dingweichen@mail.iap.ac.cn;通信作者:胡非,博士,研究员,主要从事大气边界层物理和大气湍流研究,Email:hufei@mail.iap.ac.cn。
