期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 671, 期 -, 页码 976-991出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2019.03.391
关键词
Numerical simulation; Street canyon; Viaduct; Flow field reversion; Pollutant dispersion
资金
- National Science Foundation of China [51536006]
- Shanghai Sailing Program [18YF1417600]
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.
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