期刊
ENVIRONMENTAL POLLUTION
卷 208, 期 -, 页码 161-169出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.09.004
关键词
CFD; Urban system; Vehicle turbulence; Street canyon; Traffic flow; Urban air quality; Public health; Wellbeing
We investigated the effect of different urban traffic-flow patterns on pollutant dispersion in different winds in a real asymmetric street canyon. Free-flow traffic causes more turbulence in the canyon facilitating more dispersion and a reduction in pedestrian level concentration. The comparison of with and without a vehicle-induced-turbulence revealed that when winds were perpendicular, the free-flow traffic reduced the concentration by 73% on the windward side with a minor increase of 17% on the leeward side, whereas for parallel winds, it reduced the concentration by 51% and 29%. The congested-flow traffic increased the concentrations on the leeward side by 47% when winds were perpendicular posing a higher risk to health, whereas reduced it by 17-42% for parallel winds. The urban air quality and public health can, therefore, be improved by improving the traffic-flow patterns in street canyons as vehicle-induced turbulence has been shown to contribute significantly to dispersion. (C) 2015 Elsevier Ltd. All rights reserved.
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