DOI: 10.1016/j.atmosenv.2017.09.028
Scopus记录号: 2-s2.0-85030267112
论文题名: The influence of roadside solid and vegetation barriers on near-road air quality
作者: Ghasemian M ; , Amini S ; , Princevac M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 170 起始页码: 108
结束页码: 117
语种: 英语
英文关键词: Air pollution
; Computational fluid dynamics
; k−ε turbulence model
; Solid barriers
; Vegetation barriers
; Vehicle emission
Scopus关键词: Air
; Air pollution
; Air quality
; Computational fluid dynamics
; Flow patterns
; Gas emissions
; Landforms
; Navier Stokes equations
; Pollution
; Porosity
; Roads and streets
; Roadsides
; Transportation
; Turbulence models
; Wind
; Wind tunnels
; Forestry organizations
; Green infrastructure
; Numerical methodologies
; Pollutant concentration
; Reynolds-Averaged Navier-Stokes
; Scalar transport equation
; Turbulent Schmidt number
; Vehicle emission
; Vegetation
; air quality
; atmospheric pollution
; barrier (equipment)
; canopy
; computational fluid dynamics
; concentration (composition)
; flow pattern
; Navier-Stokes equations
; numerical method
; numerical model
; pollutant
; pollution monitoring
; Reynolds number
; roadside environment
; traffic emission
; turbulence
; vegetation structure
; air pollutant
; air quality
; Article
; canopy
; computational fluid dynamics
; density
; dispersion
; environmental parameters
; highway
; leaf area
; leaf area density
; methodology
; motion
; nonhuman
; plume
; porosity
; priority journal
; vegetation
; wind
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: The current study evaluates the influence of roadside solid and vegetation barriers on the near-road air quality. Reynolds Averaged Navier-Stokes (RANS) technique coupled with the k−ε realizable turbulence model is utilized to investigate the flow pattern and pollutant concentration. A scalar transport equation is solved for a tracer gas to represent the roadway pollutant emissions. In addition, a broad range of turbulent Schmidt numbers are tested to calibrate the scalar transport equation. Three main scenarios including flat terrain, solid barrier, and vegetative barrier are studied. To validate numerical methodology, predicted pollutant concentration is compared with published wind tunnel data. Results show that the solid barrier induces an updraft motion and lofts the vehicle emission plume. Therefore, the ground-level pollutant concentration decreases compared to the flat terrain. For the vegetation barrier, different sub-scenarios with different vegetation densities ranging from approximately flat terrain to nearly solid barrier are examined. Dense canopies act in a similar manner as a solid barrier and mitigate the pollutant concentration through vertical mixing. On the other hand, the high porosity vegetation barriers reduce the wind speed and lead to a higher pollutant concentration. As the vegetation density increases, i.e. the barrier porosity decreases, the recirculation zone behind the canopy becomes larger and moves toward the canopy. The dense plant canopy with LAD=3.33m−2m3 can improve the near-road air quality by 10% and high porosity canopy with LAD=1m−2m3 deteriorates near-road air quality by 15%. The results of this study can be implemented as green infrastructure design strategies by urban planners and forestry organizations. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82522
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Mechanical Engineering, University of California, Riverside, CA, United States
Recommended Citation:
Ghasemian M,, Amini S,, Princevac M. The influence of roadside solid and vegetation barriers on near-road air quality[J]. Atmospheric Environment,2017-01-01,170