DOI: 10.1016/j.atmosenv.2014.05.015
Scopus记录号: 2-s2.0-84900808860
论文题名: Effects of roadway configurations on near-road air quality and the implications on roadway designs
作者: Steffens J ; T ; , Heist D ; K ; , Perry S ; G ; , Isakov V ; , Baldauf R ; W ; , Zhang K ; M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 94 起始页码: 74
结束页码: 85
语种: 英语
英文关键词: CFD
; Emissions
; Sustainable communities
; Urban planning
Scopus关键词: Air quality
; Computational fluid dynamics
; Large eddy simulation
; Particulate emissions
; Roadsides
; Transportation
; Urban planning
; Air pollutant concentrations
; Concentration reduction
; Large-eddy simulation models
; Pollutant concentration
; Roadway configuration
; Sustainable communities
; Sustainable transportation systems
; Wind tunnel experiment
; Highway planning
; tracer
; air quality
; atmospheric pollution
; computational fluid dynamics
; exhaust emission
; large eddy simulation
; motorway
; roadside environment
; transportation system
; urban planning
; wind tunnel
; air pollutant
; air pollution
; air quality
; airflow
; article
; atmospheric dispersion
; controlled study
; experimental study
; gas
; height
; intermethod comparison
; Large Eddy Simulation model
; mathematical model
; pollution transport
; priority journal
; railway
; simulation
; traffic and transport
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: This paper presents an analysis of wind tunnel experiments of twelve different roadway configurations and modeling of these configurations using a Large-Eddy Simulation (LES) model, aiming at investigating how flow structures affect the impact of roadway features on near-road and on-road air quality. The presence of roadside barriers, elevated fill and depressed roadways, and combinations of these configurations all reduce ground-level air pollutant concentrations immediately downwind of roadways. However, all of these cases, except the elevated fill configuration, increase pollutant concentrations on the roadway itself. For a roadside barrier with finite length, higher concentrations than those without a barrier are present in a small region near the edge of the barrier, influenced by complex flow in that region which we term "Edge Effects". The inclusion of multiple roadway features often result in lower downwind pollutant concentrations than those with single roadway features; however, adding features typically offers diminishing returns in concentration reduction. Generally, the effects on concentration, both beneficial and adverse will damp out within 15 multiples of the characteristic height, be it the barrier height or the elevation/depression height of the roadway. Thus, evaluating the trade-off between the air pollutant reductions near the ground and the air pollutant increases on the roadway and elevated above the ground will be important in designing a sustainable transportation system. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80869
Appears in Collections: 气候变化事实与影响
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作者单位: Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, United States; US EPA, Office of Research and Development, National Exposure Research Laboratory, Research Triangle Park, NC, United States; US EPA, Office of Research and Development, National Risk Management Research Laboratory, Research Triangle Park, NC, United States; US EPA, Office of Air and Radiation, Office of Transportation and Air Quality, National Vehicle and Fuel Emissions Laboratory, Ann Arbor, MI, United States
Recommended Citation:
Steffens J,T,, Heist D,et al. Effects of roadway configurations on near-road air quality and the implications on roadway designs[J]. Atmospheric Environment,2014-01-01,94