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DOI	10.1016/j.apr.2020.01.009
	The influence of a viaduct on PM dispersion in a typical street: Field experiment and numerical simulations
	Zhi H.; Qiu Z.; Wang W.; Wang G.; Hao Y.; Liu Y.
发表日期	2020
ISSN	13091042
英文摘要	To investigate the effects of a viaduct on particle diffusion below the viaduct, field measurements for particulate matter (PM) concentration along roadsides with and without viaducts were conducted in this study. Air flow and particle (PM2.5) distribution around a viaduct were simulated by Computational Fluid Dynamic (CFD) equipped with the Discrete Phase Model in a Lagrange coordinate system. Experimental results of this case study indicate that the average mass concentrations of PM10 (156.7 μg m−3), PM2.5 (77.3 μg m−3) and PM1 (56.5 μg m−3) on an elevated highway exceeded those on the ground–level expressway by 15%, 10% and 12%, respectively. Simulation found that two main vortices as well as two or three secondary vortices are generated in the canyon when both a viaduct and a barrier are added, while there was only one main vortex in the street canyon without a viaduct. A viaduct causes the particulate matter to be distributed unevenly, and the concentration on the leeward side near the ground is the highest. The vortex center is elevated as the value of ΔT (ground–level air temperature) increases, but the concentrations are basically maintained. We concluded that a viaduct increases the concentration of particulate matter in the street canyons and greatly affects the airflow field. Both ΔT and a sound barrier on a viaduct reduce the PM concentrations, but the effects are limited. © 2020 Turkish National Committee for Air Pollution Research and Control
英文关键词	CFD modeling; Field experiments; Particle dispersion; RANS; Viaduct setting
语种	英语
来源期刊	Atmospheric Pollution Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120657
作者单位	School of Automobile, Chang'an University, Chang'an Road, Xi'an, Shaanxi 710064, China
推荐引用方式 GB/T 7714	Zhi H.,Qiu Z.,Wang W.,et al. The influence of a viaduct on PM dispersion in a typical street: Field experiment and numerical simulations[J],2020.
APA	Zhi H.,Qiu Z.,Wang W.,Wang G.,Hao Y.,&Liu Y..(2020).The influence of a viaduct on PM dispersion in a typical street: Field experiment and numerical simulations.Atmospheric Pollution Research.
MLA	Zhi H.,et al."The influence of a viaduct on PM dispersion in a typical street: Field experiment and numerical simulations".Atmospheric Pollution Research (2020).