摘要
目的研究街谷内污染物质量浓度的日间变化规律和空间分布特征,温度和车流量与街谷内污染物质量浓度的关系,以便于分析城市绿化灌木对街谷内大气环境的影响.方法根据沈阳市典型街谷内的实测数据,采用ORIGIN软件分析沈阳市可吸入颗粒物的空间分布特征及其与风速、温度、车流量等要素的相关性.结果实测条件下街谷内的污染物分布受多种因素的影响,污染物质量浓度日变化呈现一定的规律性,峰谷值周期性出现;测量结果表明,在空间上,街谷内颗粒污染物质量浓度的垂直分布具有明显的分层特征,水平方向上则呈现近似对称分布的特点.结论微风条件下,街谷内颗粒污染物质量浓度主要受两个因素的影响:一个是背景质量浓度的变化;另一个是机动车排放物在街谷内的累积.街谷内污染物质量浓度的日间变化规律与背景质量浓度变化相似,与车流量并无直观的相关性.城市街谷内绿化树木对街谷内污染物分布与扩散的影响作用比较复杂.绿化树木对颗粒物有一定的吸附作用,但其也能阻碍污染物向街谷外扩散,从而引起街谷内污染物质量浓度的升高.
According to the measured data of Shenyang typical street valley,the spatial distribution characteristics of inhalableparticles in Shenyang and their correlation with wind speed,temperature and traffic floware analyzed by using the ORIGIN software. The daytime variation and spatial distribution characteristics of pollutant mass concentration in street valley,the relationship betweentemperature and vehicle flowand pollutant mass concentration in street valley,and the influence of urban greening shrubs on the atmospheric environment in street valley were obtained. Under the measured conditions,the distribution of pollutants in the street valley is affected by many factors,such as the diurnal variation of pollutant mass concentration shows certain regularity,and the peak and valley values appear periodically. The conditions in the street canyon particulate pollutant mass concentration is mainly influenced by two factors; one is the change of background mass concentration; the other is a cumulative emissions from motor vehicles in the street canyon. However,the diurnal variation of pollutant mass concentration in the street was similar to that of background mass concentration,and there was no visual correlation with traffic flow. The effect of greening trees on the distribution and diffusion of pollutants in the valley of urban street is more complex. The greening tress have certain adsorption effect on the particulate matter,but it can also prevent the pollutant from spreading outside the mass concentration of pollutants in the street valley.
作者
邹惠芬
李宗昆
殷梅梅
叶盛
李绥
ZOU Huifen;LI Zongkun;YIN Meimei;YE Sheng;LI Sui(School of Municipal and Environment Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Commerce,Shenyang Jianzhu University,Shenyang,China,110168;School of Architecture and Urban,Shenyang Jianzhu University,Shenyang,China,110168)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第4期750-758,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51208313)
关键词
城市街谷
大气环境
颗粒污染物
实测
绿化树木
urban canyon
atmospheric environment
particulates
actual measurement
afforestation trees
