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Influence of virtual changes in building configurations of a real street canyon on the dispersion of PM10

Garcia, J, Cerdeira, R, Tavares, N, Coelho, LMR, Kumar, P and Carvalho, MG (2013) Influence of virtual changes in building configurations of a real street canyon on the dispersion of PM10 Urban Climate, 5. pp. 68-81.

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Four geometrical configurations of a real street canyon in Barreiro city (Portugal) are considered to study their influence on the dispersion of PM. These configurations include actual architectural layout of the street (Option 1), and three virtual cases (Options 1-3). Option 2 includes the modification of real geometry by including 4 m gaps between the buildings situated on the southern part of the street canyon. Option 3 considers 6 m gaps between buildings as opposed to 4 m gaps in Option 2. Option 4 assumes the same height for all buildings on the southern part of the street canyon, with no gaps between buildings. Computational fluid dynamics code (CFD), FLUENT, is used to simulate the detailed flow and turbulence characteristics in three-dimensional domain of chosen street canyon, together with the PM dispersion for both the summer and winter seasons. The modelled PM concentrations were then compared with the measured data at seven different locations in the street canyon. Our results indicate up to 23% lower PM concentrations at 1.5 m above the road level during the along-canyon wind direction due to the channelling of flow, compared with those observed during the cross-canyon wind direction. Detailed inspection of the results obtained from the Options 1-3 indicated that the spacing between the buildings tend to increase particle dilution during the cross-canyon winds, resulting in up to 20, and 22% reduced concentrations for options 2, and 3 respectively, compared with the actual configuration (Option 1). The largest improvement (∼7%) in the PM concentrations was given by Option 2, while other options showed modest changes. Possible reasons for these changes under varying meteorological conditions are explained in the context of changing building configurations and their implications in city planning. © 2013 Elsevier Ltd. All rights reserved.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Date : 1 October 2013
Identification Number : 10.1016/j.uclim.2013.08.002
Uncontrolled Keywords : PM10 dispersion; CFD code FLUENT; Barreiro street canyon; Real and virtual building configurations; Traffic emissions
Related URLs :
Additional Information : NOTICE: this is the author’s version of a work that was accepted for publication in Urban Climate. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Urban Climate, 5, October 2013, DOI 10.1016/j.uclim.2013.08.002
Depositing User : Symplectic Elements
Date Deposited : 04 Nov 2013 16:18
Last Modified : 09 Jun 2014 13:37

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