DOI: 10.1016/j.atmosenv.2015.08.034
Scopus记录号: 2-s2.0-84939634281
论文题名: Numerical simulation of diurnally varying thermal environment in a street canyon under haze-fog conditions
作者: Tan Z ; , Dong J ; , Xiao Y ; , Tu J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 119 起始页码: 95
结束页码: 106
语种: 英语
英文关键词: CFD
; Diurnal variation
; Flow pattern
; Haze-fog
; Street canyon
; Thermal environment
Scopus关键词: Atmospheric temperature
; Flow patterns
; Fog
; Light extinction
; Numerical models
; Pollution
; Surface properties
; Thermal comfort
; Diurnal variation
; Light extinction coefficients
; Pollutant dispersions
; Street canyon
; Surface temperatures
; Temperature differences
; Thermal environment
; Vehicular emission
; Computational fluid dynamics
; diurnal variation
; flow pattern
; fog
; haze
; numerical model
; street canyon
; surface temperature
; temperature effect
; wind-driven circulation
; absorption
; air temperature
; ambient air
; Article
; circadian rhythm
; dispersion
; fog
; heating
; pollutant
; priority journal
; simulation
; solar radiation
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 impact of haze-fog on surface temperature, flow pattern, pollutant dispersion and pedestrian thermal comfort are investigated using computational fluid dynamics (CFD) approach based on a three-dimensional street canyon model under different haze-fog conditions. In this study, light extinction coefficient (Kex) is adopted to represent haze-fog pollution level. Numerical simulations are performed for different Kex values at four representative time events (1000 LST, 1300 LST, 1600 LST and 2000 LST). The numerical results suggest that the surface temperature is strongly affected by the haze-fog condition. Surface heating induced by the solar radiation is enhanced by haze-fog, as higher surface temperature is observed under thicker haze-fog condition. Moreover, the temperature difference between sunlit and shadow surfaces is reduced, while that for the two shadow surfaces is slightly increased. Therefore, the surface temperature among street canyon facets becomes more evenly distributed under heavy haze-fog conditions. In addition, flow patterns are considerably altered by different haze-fog conditions, especially for the afternoon (1600 LST) case, in which thermal-driven flow has opposite direction as that of the wind-driven flow direction. Consequently, pollutants such as vehicular emissions will accumulate at pedestrian level, and pedestrian thermal comfort may lower under thicker haze-fog condition. © 2015 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81557
Appears in Collections: 气候变化事实与影响
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作者单位: College of Urban Construction and Environmental Engineering, Chongqing University, China; School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Australia
Recommended Citation:
Tan Z,, Dong J,, Xiao Y,et al. Numerical simulation of diurnally varying thermal environment in a street canyon under haze-fog conditions[J]. Atmospheric Environment,2015-01-01,119