Impact of viaduct on flow reversion and pollutant dispersion in 2D urban street canyon with different roof shapes - Numerical simulation and wind tunnel experiment

被引：47

作者：

Ding, Shuo ^{[1
,2
]}

Huang, Yuandong ^{[2
]}

Cui, Pengyi ^{[2
]}

Wu, Jian ^{[3
]}

Li, Mengzhen ^{[2
]}

Liu, Dantong ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Atmospher Sci, Sch Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China

[2] Univ Shanghai Sci & Technol, Sch Environm & Architecture, Shanghai 200093, Peoples R China

[3] China Univ Geosci, Sch Environm Studies, Dept Environm Sci & Technol, Wuhan 430074, Hubei, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2019年 / 671卷

基金：

美国国家科学基金会;

关键词：

Numerical simulation; Street canyon; Viaduct; Flow field reversion; Pollutant dispersion; PERSONAL INTAKE FRACTION; AIR-POLLUTION; BUILDING ROOF; HUMAN HEALTH; ASPECT RATIOS; EXPOSURE; QUALITY; VALIDATION; SETTINGS; HEIGHT;

D O I：

10.1016/j.scitotenv.2019.03.391

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A numerical simulation and a wind tunnel experiment are performed to investigate the flow field and pollutant dispersion in a two dimensional (2-D) ideal urban street canyon with roofs installed in a viaduct at different heights. Two typical roof shapes are taken into consideration: double flat (DF) and double triangular (DT). The simulation results show that when the height of the viaduct is at 0.875H-0.98H for DF and at 0.71H-0.988H for DT, the main flow field in the canyon will be reversed compared to initial flow field. This reversing phenomenon will aggravate pollution for DF and significantly mitigate pollution for DT compared to levels without a viaduct. The wind tunnel experiment is qualitatively consistent with the numerical simulation results which indicates that this reversing phenomenon is not just theoretical. A mechanism is proposed whereby the viaduct obstructing airflow is the key reason for the flow field reversion. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：976 / 991

页数：16

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