Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 28, Issue 12, Pages 15537-15550Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-11512-6
Keywords
Street canyons; Numerical simulation; Euler– Lagrangian method; Roof angle; Flow field; Pollutant diffusion
Categories
Funding
- National Natural Science Foundation of China [U1933131, 51906055]
- Fundamental Research Funds for the Central Universities [PA2020GDKC0017]
- China Postdoctoral Science Foundation [2018M640582]
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The Euler-Lagrangian method was used to simulate the dispersion of gaseous pollutants and particulate matter in isolated street canyons, with a detailed analysis of the flow structures and pollutant distributions under different roof angles. Results show that different flow structures lead to varying concentrations of pollutants, and a small roof incline angle is generally recommended to reduce pollutant concentrations in the canyons.
The Euler-Lagrangian method is adopted to simulate the dispersion of gaseous pollutants and particulate matter (PM) in isolated street canyons, and the influences of the roof angle on the flow structures and distributions of gaseous pollutants and PM are analyzed in detail. Numerical simulation results indicate that gaseous pollutants and PM in the canyons present three typical single main clockwise vortex, transition vortex, and double vortex structures, which are identified at increasing roof slopes. Gaseous pollutants and PM demonstrate the lowest concentration of pollutants when a single vortex structure exists. The concentration of gaseous pollutants and PM reaches the highest value in pedestrian-level areas when the flow field is in a transitional vortex structure. Unlike gaseous pollutants, the concentration of PM does not always decrease with increasing altitude, and higher PM concentrations sometimes occur in the mid-level areas of the canyon. A small roof incline angle is generally recommended for discharging gaseous pollutants and PM.
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