Influence of avenue trees on traffic pollutant dispersion in asymmetric street canyons: Numerical modeling with empirical analysis |
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| Institution: | 1. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. China Institute of Urban Governance, Shanghai Jiao Tong University, Shanghai 200240, China;3. Center for ITS and UAV Applications Research, Shanghai Jiao Tong University, Shanghai 200240, China;1. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, China;2. China Institute of Urban Governance, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, China;3. Shanghai Urban Construction Design & Research Institute (Group) Co., Ltd, No. 3447 Dongfang Road, Pu-Dong New District, Shanghai 200215, China;4. Department of Urban and Regional Planning, University of Hawaii, Manoa, No. 2424 Maile Way, Honolulu, HI 96822, United States;1. Department of Physics and Astronomy, University of Leicester, Leicester, UK;2. Bluesky International Limited, Old Toy Factory, Jackson Street, Coalville, UK;3. Department of Engineering, University of Leicester, Leicester, UK;4. Department of Chemistry, University of Leicester, Leicester, UK;1. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Logistics Research Center, Shanghai Maritime University, Shanghai 200135, China;3. Department of Urban and Regional Planning, University of Florida, PO Box 115706, Gainesville, FL 32611-5706, USA;1. Department of Physics and Astronomy, University of Leicester, Leicester, UK;2. Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, University of Salento, S.P. 6 Lecce-Monteroni, 73100 Lecce, Italy;3. Bluesky International Limited, Old Toy Factory, Jackson Street, Coalville, UK;4. Department of Chemistry, University of Leicester, Leicester, UK;1. Atmospheric Pollution Division, Environmental Department, CIEMAT, Av. Complutense 40, 28040, Madrid, Spain;2. Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, University of Salento, S.P. 6 Lecce-Monteroni, 73100, Lecce, Italy;3. LICA, Department of Chemistry, University of Navarra, Irularrea s/n, 31008, Pamplona, Spain |
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| Abstract: | The dispersion of traffic-related pollutants in urban street canyons is of importance for the health and quality of lives. To reveal the inherent principle, researchers have performed a lot of investigations; many dispersion phenomena have also been assessed during recent years. However, the presence of avenue trees in street canyons and their capacity for pollutant dispersion remains partly addressed. In this study, we investigated the effects of avenue trees in urban street canyons on traffic pollutant dispersion. The dispersion of CO concentration in asymmetric street canyons was simulated under varied situations. The computational results showed a good agreement with the experimental data, and the numerical model was validated to be adequate for investigating the pollutant dispersion in street canyons. Then, the numerical simulations were extended to explore the impacts of the effects of avenue trees on CO dispersion; the results indicated that avenue trees generally increase CO concentrations in asymmetric street canyons. When the wind direction is perpendicular to the street axis, a terraced building raises pollutant concentrations at the windward wall and reduces concentration at the leeward wall on the pedestrian levels. Findings of this study are expected to provide significant insight into urban road design and strategy making for avenue tree planting, particularly under the existing worldwide sustainable low-carbon urban development. |
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| Keywords: | Urban traffic Low-carbon transportation Traffic pollutant Street canyons Computational Fluid Dynamics (CFD) simulation |
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