| 建筑动力学作用对近地面短历时点源污染扩散的影响 |
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| 引用本文： | 李磊,李书严,轩春怡,郭文利,黄顺祥,刘峰.建筑动力学作用对近地面短历时点源污染扩散的影响[J].城市环境与城市生态,2008(5). |
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| 作者姓名： | 李磊 李书严 轩春怡 郭文利 黄顺祥 刘峰 |
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| 作者单位： | 北京市气象局北京市气候中心;防化指挥工程学院; |
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| 基金项目： | 国家自然科学基金(40652001,40775015); 北京市财政局项目“污染扩散数值模式开发”; 国家十一五科技支撑计划项目(2006BAK01A14) |
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| 摘 要： | 利用一次示踪剂扩散外场实验获得的数据,对城市小区尺度模式USSM在模拟短历时点源方面的能力进行了验证,结果表明USSM能较为合理地描述城区短历时点源的扩散特征。利用USSM进行了3个案例的情景模拟分析,得出结论:1)街区内建筑群的平均高度越高,建筑群之间的流场越紊乱,并且越容易形成涡旋型环流,同时建筑群之间的风速会变得越来越小。除此之外,随着建筑群平均高度的增加,受建筑群影响风场出现扰动现象的范围越大。2)建筑群平均高度的增高会显著降低街区内的扩散能力,并且这种影响可能是非线性的,当街区由小高层建筑为主变为高层建筑为主时,污染物输送扩散效率会急剧下降。
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| 关 键 词： | 城市建筑群 污染物 扩散 数值模拟 |
Influence of Dynamical Effect of Urban Buildings on Diffusion Process of Pollutants Released from Short-Duration Point Source near Ground |
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| LI Lei,LI Shu-yan,XUAN Chun-yi,GUO Wen-li,HUANG Shun-xiang,LIU Feng.Influence of Dynamical Effect of Urban Buildings on Diffusion Process of Pollutants Released from Short-Duration Point Source near Ground[J].Urban Environment & Urban Ecology,2008(5). |
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| Authors: | LI Lei LI Shu-yan XUAN Chun-yi GUO Wen-li HUANG Shun-xiang LIU Feng |
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| Affiliation: | LI Lei1,LI Shu-yan1,XUAN Chun-yi1,GUO Wen-li1,HUANG Shun-xiang2,LIU Feng2(1.Beijing Meteorological Bureau,Beijing Regional Climate Center,Beijing 100089,China,2.Institute of Chemical Defense,Beijing 102205,China) |
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| Abstract: | By using an observation data collected from a smog tracer diffusion experinment,it was validated that a micro-scale model,namely Urban Sub-domain Scale Model(USSM),can simulate a short duration point source.The comparison between the observed and simulated data showed that USSM could reasonably describe the diffusion process of the pollutant released from a short-duration point source in urban streets.Three numerical tests were performed by using USSM,and some conclusions were drawn from these tests: 1) Alo... |
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| Keywords: | urban buildings pollutant diffusion numerical simulation |
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