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Article: Numerical investigation of pollutant transport characteristics inside deep urban street canyons

TitleNumerical investigation of pollutant transport characteristics inside deep urban street canyons
Authors
KeywordsDeep Street Canyon
Large-Eddy Simulation (Les)
Pollutant Dispersion
Turbulent Diffusion
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenv
Citation
Atmospheric Environment, 2009, v. 43 n. 15, p. 2410-2418 How to Cite?
AbstractA validated LES model was employed to simulate the street canyons of aspect ratio (AR) 3, 5, and 10. Three, five, and eight vertically aligned primary recirculations were found for the three cases, respectively, which showed decreasing strength with decreasing height. The ground-level wind speeds were found to be very small, making it extremely difficult for the ground-level pollutants to disperse. Local maxima of turbulence intensities were found at the interfaces between the primary recirculations and the shear layer. The pollutant trajectory followed the primary recirculations. High pollutant concentration and variance were found near the buildings where wind flowed upward. Large gradients of pollutant concentration and variance were also observed at the interfaces between the primary recirculations and the shear layer. Detailed analyses of concentration budget showed that the advection terms were responsible for pollutant redistribution within primary recirculations, while the turbulent transport terms were responsible for pollutant penetration between primary recirculations as well as pollutant removal from the street canyon. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156998
ISSN
2015 Impact Factor: 3.459
2015 SCImago Journal Rankings: 1.999
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grant CouncilHKU 7196/03E
7111/04E
Computer Centre of The University of Hong Kong
Funding Information:

The authors wish to acknowledge the Hong Kong Research Grant Council for supporting this project under grants HKU 7196/03E and 7111/04E. The computational Support from Computer Centre of The University of Hong Kong is also acknowledged. The first author would like to thank Prof Rex Britter for his helpful discussion during his visit to Singapore. The valuable comments by two anonymous reviewers are appreciated.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorLi, XXen_US
dc.contributor.authorLiu, CHen_US
dc.contributor.authorLeung, DYCen_US
dc.date.accessioned2012-08-08T08:44:53Z-
dc.date.available2012-08-08T08:44:53Z-
dc.date.issued2009en_US
dc.identifier.citationAtmospheric Environment, 2009, v. 43 n. 15, p. 2410-2418en_US
dc.identifier.issn1352-2310en_US
dc.identifier.urihttp://hdl.handle.net/10722/156998-
dc.description.abstractA validated LES model was employed to simulate the street canyons of aspect ratio (AR) 3, 5, and 10. Three, five, and eight vertically aligned primary recirculations were found for the three cases, respectively, which showed decreasing strength with decreasing height. The ground-level wind speeds were found to be very small, making it extremely difficult for the ground-level pollutants to disperse. Local maxima of turbulence intensities were found at the interfaces between the primary recirculations and the shear layer. The pollutant trajectory followed the primary recirculations. High pollutant concentration and variance were found near the buildings where wind flowed upward. Large gradients of pollutant concentration and variance were also observed at the interfaces between the primary recirculations and the shear layer. Detailed analyses of concentration budget showed that the advection terms were responsible for pollutant redistribution within primary recirculations, while the turbulent transport terms were responsible for pollutant penetration between primary recirculations as well as pollutant removal from the street canyon. © 2009 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenven_US
dc.relation.ispartofAtmospheric Environmenten_US
dc.subjectDeep Street Canyonen_US
dc.subjectLarge-Eddy Simulation (Les)en_US
dc.subjectPollutant Dispersionen_US
dc.subjectTurbulent Diffusionen_US
dc.titleNumerical investigation of pollutant transport characteristics inside deep urban street canyonsen_US
dc.typeArticleen_US
dc.identifier.emailLiu, CH:chliu@hkucc.hku.hken_US
dc.identifier.emailLeung, DYC:ycleung@hku.hken_US
dc.identifier.authorityLiu, CH=rp00152en_US
dc.identifier.authorityLeung, DYC=rp00149en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.atmosenv.2009.02.022en_US
dc.identifier.scopuseid_2-s2.0-63249117607en_US
dc.identifier.hkuros157265-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-63249117607&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume43en_US
dc.identifier.issue15en_US
dc.identifier.spage2410en_US
dc.identifier.epage2418en_US
dc.identifier.isiWOS:000266016600004-
dc.publisher.placeUnited Kingdomen_US
dc.relation.projectDevelopment of a three-dimensional numerical model for air pollution study in urban street canyons-
dc.identifier.scopusauthoridLi, XX=8091988100en_US
dc.identifier.scopusauthoridLiu, CH=36065161300en_US
dc.identifier.scopusauthoridLeung, DYC=7203002484en_US
dc.identifier.citeulike4193674-

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