城市道路十字交叉口周围建筑高度对PM_(10)扩散的影响  

Influence of Different Orientation Building Heights on PM_(10) Diffusion around an Urban Intersection

作　　者：焦丽慧[1] 张鸿雁[1] 崔海航[1] 张瑶[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《城市环境与城市生态》2013年第1期9-12,15,共5页Urban Environment & Urban Ecology

基　　金：陕西省教育厅自然科学科研专项(2010JK658);国家教学质量工程(Zlgc0503)

摘　　要：采用Realizable k-ε湍流模型对十字交叉口处PM10扩散行为进行了数值模拟,比较街道两侧人行通道附近若干监测点的PM10浓度值,分析了不同方位建筑高度对PM10浓度分布的影响。数据分析表明,在特定主导风向与街道方向成一定夹角的条件下,上风向迎风建筑物高度的增加,导致不同街道上各监测点的PM10浓度在波动降低;下风向迎风建筑对上风向街道影响较小,但使得下风向街道的PM10浓度值急剧下降;而当与来流风向相互垂直建筑物的高度增加时,建筑物两侧两条街道的PM10浓度都有上升的趋势。在实际十字交叉口规划建设中,可根据城市主导风向调整不同方位建筑高度的布局,从而改善交叉口周围的环境质量。The PM10 features around an urban intersection was simulated with Realizable k-e turbulence model. And the PMlo concentrations of several sampling points around the sidewalk were compared among them to analyze the influences of the heights of different buildings. The numerical results showed that under a certain dominant wind, which had an angle with the reference direction of selected streets, the increase of height of upwind building at upstreaming would lead to the fluctuating decrease of PM10 concentrations of the sampling points. While the height of upwind building at upstreaming had little influence but made the PM10 concentrations of downwind streets decline sharply. Along with the increase of the height of the building that was vertical to the direction of inflow, the PM10 concentrations on both sides of the building would tend to increase. In the actual planning and construction of the cross intersection, the height distribution of the different orientation buildings could be adjusted according to the city dominant wind direction, so as to improve the environmental quality around the intersection.

关 键 词：可吸入颗粒物(PM10) 道路交叉口 建筑物高度 浓度分布 数值模拟 

分 类 号：X513[环境科学与工程—环境工程]