DOI: 10.1016/j.atmosenv.2017.06.031
Scopus记录号: 2-s2.0-85021343179
论文题名: Effects of canyon geometry on the distribution of traffic-related air pollution in a large urban area: Implications of a multi-canyon air pollution dispersion model
作者: Fu X ; , Liu J ; , Ban-Weiss G ; A ; , Zhang J ; , Huang X ; , Ouyang B ; , Popoola O ; , Tao S
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 165 起始页码: 111
结束页码: 121
语种: 英语
英文关键词: Canyon geometry
; Street canyon
; Traffic pollutant
; Urban air pollution
Scopus关键词: Computational fluid dynamics
; Computer integrated manufacturing
; Geometry
; Pollution
; Traffic control
; Urban planning
; Air pollutant dispersion
; Air pollution dispersion
; Computational fluid dynamics modeling
; Pollution concentration
; Street canyon
; Traffic pollutants
; Traffic-related air pollution
; Urban air pollution
; Air pollution
; atmospheric pollution
; computational fluid dynamics
; concentration (composition)
; dispersion
; geometry
; pedestrian
; pollution exposure
; pollution monitoring
; spatial distribution
; street canyon
; traffic emission
; urban design
; urban pollution
; urban population
; ventilation
; wind field
; air conditioning
; Article
; atmospheric dispersion
; building
; controlled study
; environmental exposure
; exhaust gas
; geometry
; height
; human
; inhalation
; pedestrian
; priority journal
; urban area
; urban population
; weather
; Beijing [China]
; China
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Street canyons are ubiquitous in urban areas. Traffic-related air pollutants in street canyons can adversely affect human health. In this study, an urban-scale traffic pollution dispersion model is developed considering street distribution, canyon geometry, background meteorology, traffic assignment, traffic emissions and air pollutant dispersion. In the model, vehicle exhausts generated from traffic flows first disperse inside street canyons along the micro-scale wind field generated by computational fluid dynamics (CFD) model. Then, pollutants leave the street canyon and further disperse over the urban area. On the basis of this model, the effects of canyon geometry on the distribution of NOx and CO from traffic emissions were studied over the center of Beijing. We found that an increase in building height leads to heavier pollution inside canyons and lower pollution outside canyons at pedestrian level, resulting in higher domain-averaged concentrations over the area. In addition, canyons with highly even or highly uneven building heights on each side of the street tend to lower the urban-scale air pollution concentrations at pedestrian level. Further, increasing street widths tends to lead to lower pollutant concentrations by reducing emissions and enhancing ventilation simultaneously. Our results indicate that canyon geometry strongly influences human exposure to traffic pollutants in the populated urban area. Carefully planning street layout and canyon geometry while considering traffic demand as well as local weather patterns may significantly reduce inhalation of unhealthy air by urban residents. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82580
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, China; Department of Civil and Environmental Engineering, University of Southern CaliforniaCA, United States; Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
Recommended Citation:
Fu X,, Liu J,, Ban-Weiss G,et al. Effects of canyon geometry on the distribution of traffic-related air pollution in a large urban area: Implications of a multi-canyon air pollution dispersion model[J]. Atmospheric Environment,2017-01-01,165