| 基于北京中心城区实测的城市边界层风场特性 |
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| 引用本文： | 张鑫鑫,李波,张石,杨庆山,田玉基.基于北京中心城区实测的城市边界层风场特性[J].建筑结构学报,2022,43(3):109-117. |
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| 作者姓名： | 张鑫鑫 李波 张石 杨庆山 田玉基 |
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| 作者单位： | 1. 北京交通大学 土木建筑工程学院， 北京 100044； 2. 北京交通大学 结构风工程与城市风环境北京市重点实验室， 北京 100044； 3. 北京建筑大学 土木与交通工程学院， 北京 100044； 4. 重庆大学 土木工程学院， 重庆 400044 |
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| 基金项目： | 国家自然科学基金项目(51878041)；;高等学校学科创新引智计划资助项目(B13002)； |
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| 摘 要： | 为了对城市边界层的特殊风场特性进行研究,利用位于北京中心城区325 m气象观测塔,在9个不同高度布置超声风速仪,得到了2013-2017年间风速、温度连续观测的实测数据.统计分析表明:北京城区以良态风为主,盛行北风、西北风及南风,但强风主要来自西北向;除昼夜温度变化外,城市边界层的热量交换很大程度受到下垫面逆辐射影响....
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| 关 键 词： | 城市边界层 风场特性 实测 分层结构 平均风 脉动风 |
Characteristics of wind field in urban boundary layer based
on measured data in central Beijing |
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| ZHANG Xinxin,LI Bo,ZHANG Shi,YANG Qingshan,TIAN Yuji.Characteristics of wind field in urban boundary layer based
on measured data in central Beijing[J].Journal of Building Structures,2022,43(3):109-117. |
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| Authors: | ZHANG Xinxin LI Bo ZHANG Shi YANG Qingshan TIAN Yuji |
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| Affiliation: | 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China； 2. Beijing’s Key Laboratory
of Structural Wind Engineering and Urban Wind Environment, Beijing Jiaotong University, Beijing 100044, China；
3. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing
100044, China; 4. School of Civil Engineering, Chongqing University, Chongqing 400044, China; |
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| Abstract: | In order to study the special wind field characteristics of the urban boundary layer, nine ultrasonic anemometers were arranged at different heights of the 325 m meteorological observation tower located in the central urban area of Beijing, and the measured data of wind speeds and temperature from 2013 to 2017 have been recorded continuously. The statistical analyses show that it presents the normal wind climate in Beijing prevailing the north, northwest and south winds, of which the strongest winds are mainly from northwest. In addition to the diurnal temperature variations, the heat exchange in the urban boundary layer (UBL) is greatly affected by the back radiation of the underlying surface. The air flow mechanism of the UBL is different from that from the flat and open landform, which appears an obvious atmospheric stratification. Considering the strong wind records, the neutral stratification in the roughness sub-layer (RSL) accounts for 97%. The inertial sub-layer (ISL) is dominated by the unstable stratification, the mixed layer (ML) is dominated by the stable stratification, and the proportions of the neutral stratification are 40% and 25%, respectively. The analyses of the strong wind samples selected show that the mean wind speed profiles below and above 100 m are slightly different due to the stratification structure of the UBL. Overall, the wind speed profiles conform to the exponential model, while the geomorphic parameters recommended in the code appear to be more conservative. The longitudinal turbulence intensity fluctuates greatly in the RSL (47m) and the ISL (140m), but less in the ML (280m), and the power spectral densities of fluctuating wind speeds in different sublayers are consistent with the von Karman spectrum. The proportion of the horizontal and vertical scales of the vortex in the ML is significantly larger than that in the RSL and ISL. |
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| Keywords: | urban boundary layer wind field characteristic field measurement stratification structure mean wind fluctuating wind |
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