杭州城市下垫面变化对污染物扩散影响的研究  

Study of the Effects of Urban Underlying Surface Changing on the Air Pollution Diffusion in Hangzhou

作　　者：何曦[1] 叶贤满[1] 马万里[2] 王成刚[2] 

机构地区：[1]杭州市环境监测中心站,杭州310007 [2]杭州市气象局,杭州310051

出　　处：《科学技术与工程》2017年第11期122-130,共9页Science Technology and Engineering

基　　金：杭环保科技2011001;中国气象局气候变化专项(CCSF201618)资助

摘　　要：利用中尺度化学模式WRF-CHEM,及2000—2010年土地利用类型资料、污染物浓度资料、气象场资料,对比分析了杭州城市下垫面变化对空气污染扩散的影响。(1)对比2000年及2010年杭州城市下垫面的变化可见,不同风向条件下市区的整体风速都有明显减弱趋势,其中主城区、萧山、滨江三个区域风速减小程度最大,而且受水平扩散能力的减弱,NO_x浓度的高值区范围有所增加,强中心的污染程度加大;(2)不同类型下垫面对污染物扩散的影响程度有显著差异。模式中原有的下垫面替换为水体后,大气扩散能力显著增强,整个区域的污染物浓度降至最低。在森林下垫面的模拟结果中,由于风速相对较小,扩散能力较弱,浓度大值区主要分布在上城区、下城区、滨江区及萧山区。Using the mesoscale model WRF-CHEM, the data of urban underlying surface in 2000 and 2010, the data of pollutant concentration and the data of meteorology, the influence of the changing of urban underlying surface on the air pollution diffusion was compared and analyzed. （T） The comparison study of urban underlying surface in 2000 and 2010 showed that the city^s averaged wind speed had obviously weakened, in different wind direction. The wind speed in downtown Xiaoshan and Binjiang had the largest reduce. Influenced by the reduction in diffusion ability, NO% concentration range of high value area increased and the peak of pollution increased. @ The influence by different urban underlying surface have significant differences. When the urban underlying surface was replaced by water, the capability of atmospheric diffusion enhanced and the whole area of pollutants concentration reached to a minimum. When it was replaced by water, owing to the wind speed is relatively small, the diffusion ability was weak, the concentration of big value areas were mainly distributed in Shangcheng, Xiacheng, Binjiang, and Xiaoshan.

关 键 词：城市下垫面 WRF-CHEM 污染物扩散 

分 类 号：X51[环境科学与工程—环境工程]