Influence of avenue trees on traffic pollutant dispersion in asymmetric street canyons: Numerical modeling with empirical analysis

2018 ◽  
Vol 65 ◽  
pp. 784-795 ◽  
Author(s):  
Daniel(Jian) Sun ◽  
Ying Zhang
Keyword(s):  
Numerical Modeling ◽  
Empirical Analysis ◽  
Pollutant Dispersion ◽  
Street Canyons

Large-Eddy Simulation of Reactive Pollutant Dispersion Over Street Canyons of Different Aspect Ratios

2014 ◽  
Author(s):  
T. Z. Du ◽  
Chun-Ho Liu ◽  
Y. B. Zhao
Keyword(s):  
Aspect Ratio ◽  
Large Eddy Simulation ◽  
Chemical Reactions ◽  
Pollutant Dispersion ◽  
Pollutant Removal ◽  
Street Canyons ◽  
Eddy Simulation ◽  
Aspect Ratios ◽  
Large Eddy ◽  
Reactive Pollutant

In urban areas, pollutants are emitted from vehicles then disperse from the ground level to the downstream urban canopy layer (UCL) under the effect of the prevailing wind. For a hypothetical urban area in the form of idealized street canyons, the building-height-to-street-width (aspect) ratio (AR) changes the ground roughness which in turn leads to different turbulent airflow features. Turbulence is considered an important factor for the removal of reactive pollutants by means of dispersion/dilution and chemical reactions. Three values of aspect ratio, covering most flow scenarios of urban street canyons, are employed in this study. The pollutant dispersion and reaction are calculated using large-eddy simulation (LES) with chemical reactions. Turbulence timescale and reaction timescale at every single point of the UCL domain are calculated to examine the pollutant removal. The characteristic mechanism of reactive pollutant dispersion over street canyons will be reported in the conference.

scholarly journals Effect of traffic tidal flow on pollutant dispersion in various street canyons and corresponding mitigation strategies

2020 ◽  
Vol 1 (3) ◽  
pp. 242-253 ◽  
Author(s):  
Zhengtong Li ◽  
Tianhao Shi ◽  
Yongjia Wu ◽  
Hao Zhang ◽  
Yu-Hsuan Juan ◽  
...  
Keyword(s):  
Tidal Flow ◽  
Pollutant Dispersion ◽  
Mitigation Strategies ◽  
Street Canyons

The effect of exhaust emissions from a group of moving vehicles on pollutant dispersion in the street canyons

2020 ◽  
Vol 181 ◽  
pp. 107120 ◽  
Author(s):  
Tianhao Shi ◽  
Tingzhen Ming ◽  
Yongjia Wu ◽  
Chong Peng ◽  
Yueping Fang ◽  
...  
Keyword(s):  
Pollutant Dispersion ◽  
Exhaust Emissions ◽  
Street Canyons ◽  
Moving Vehicles

Pollutant dispersion and thermal effects in urban street canyons

1996 ◽  
Vol 30 (15) ◽  
pp. 2659-2677 ◽  
Author(s):  
Jean-François Sini ◽  
Sandrine Anquetin ◽  
Patrice G. Mestayer
Keyword(s):  
Thermal Effects ◽  
Pollutant Dispersion ◽  
Street Canyons ◽  
Urban Street ◽  
Urban Street Canyons
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