摘要
利用ENVI-met微气候软件,针对城市主导风向及城区绿化灌木高度、排列数、连续性存在的差异,对街道峡谷内气流组织形式及污染物浓度分布进行了仿真计算.结果表明:主导风向使街道峡谷背风侧污染程度加剧;在浅街道峡谷,污染物浓度因灌木的存在而增加,且灌木高度和排列数的相互作用会进一步加剧空气污染程度,灌木越高、排数越多,污染程度越严重;灌木高度为2.25 m、临街两排植被布局工况与无植被工况相比,建筑背风侧污染物浓度增加程度最大为78.4%;灌木的不连续性排列会降低浅街道峡谷背风侧的污染物浓度,但会加剧迎风侧的污染程度.当街道峡谷类型为浅街道峡谷时,配置灌木作为缓解空气污染的方法并不适合.
Urban vehicle exhaust pollutants were closely related to the health of pedestrians,and the influence of green vegetation on the diffusion of pollutants can not be ignored.The Envi-met microclimate software was used to simulate and calculate the air distribution and pollutant concentration distribution in the street canyon under the conditions of the dominant urban wind direction,different heights,different arrangement numbers and continuous shrub distribution.The results show that the dominant wind direction will aggravate the pollution in the leeward side of the street canyon.In the shallow street canyon,the concentration of pollutants increased due to the presence of shrubs,and the interaction between shrub height and the number of shrubs further worsened the air pollution degree.The higher the height of shrubs,the more the number of rows,the higher the pollution degree.When the height of shrub was 2.25 m and the two rows of vegetation were located on the street,the pollutant concentration in the leeward side of the building increases to the maximum of 78.4%compared with that in the condition without vegetation.The discontinuous arrangement of shrubs decreases the concentration of pollutants on the leeward side of the shallow street canyon,but increases the degree of pollution on the windward side.Therefore,shrubs were not suitable for air pollution mitigation when the type of street canyon was shallow.
作者
徐沛巍
李晓莉
吕广
张帅
李进
战乃岩
XU Pei-wei;LI Xiao-li;LYU Guang;ZHANG Shuai;LI Jin;ZHAN Nai-yan(Department of Information Technology,Jilin Province Education College,Changchun 130022,China;Urban Construction College,Changchun University of Architecture,Changchun 130600,China;School of Emergency Science and Engineering,Jilin Jianzhu University,Changchun 130118,China)
出处
《东北师大学报（自然科学版）》
CAS
北大核心
2022年第4期129-135,共7页
Journal of Northeast Normal University(Natural Science Edition)
基金
国家重点研发计划项目(2017YFC0212100)
吉林省自然科学基金资助项目(20180101320JC)
关键词
机动车尾气
街道峡谷
灌木
污染物浓度
仿真计算
vehicle exhaust pollutants
street canyon
shrubs
pollutant concentration
numerical simulation
