Effect of traffic tidal flow on pollutant dispersion in various street canyons and corresponding mitigation strategies

Zhengtong Li, Tianhao Shi, Yongjia Wu, Hao Zhang, Yu-Hsuan Juan, Tingzhen Ming, Nan Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Increasing traffic emission presents a high risk of exposure to residents in near-road buildings. Traffic tidal flow (TTF) has gradually become one of the most important components of urban traffic congestion. By computational fluid dynamics simulation, the present study examines the airflow, spatial distribution of pollutant concentration, and personal intake fraction (IF_p) of CO in five street canyon structures (shallow, regular, deep, step-up, and step-down street canyons), with non-uniform TTF-induced traffic emission considered. Optimal urban design devices (wind catchers) are subsequently introduced to reduce IF_p. The results suggest that leeward IF_p is far higher in concentration than the windward wall in the shallow, regular, step-up, and step-down street canyons but lower than the windward side in the deep street canyon under different TTF conditions. Moreover, the TTF condition SL (leeward source)/SW (windward source)=3/1 leads to a higher leeward IF_p in the shallow, regular, deep, and step-up street canyons, compared with SL/SW=1/3; however, no significant difference in windward IF_p is found under the different TTF conditions. The highest IF_p and lowest IF_p for both TTF configurations occur in the step-down and shallow street canyons, respectively. Finally, the effect of wind catchers (WCs) varies between the street canyon structures under different TTF conditions. WCs can lead to at least 30.6% reduction in leeward overall average IF_p () in the shallow, regular, step-up, and step-down street canyons, as well as 12.8%–78.4% decrease in windward 〈IF_p〉 owing to the WCs in the regular, deep, step-up, and step-down street canyons.
Original languageOthers/Unknown
Pages (from-to)242-253
Number of pages12
JournalEnergy and Built Environment
Volume1
Issue number3
DOIs
Publication statusPublished - 2020

Keywords

  • Street canyon
  • Intake fraction
  • Computational fluid dynamics (CFD)
  • Wind catchers

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