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Article: A concentration correction scheme for Lagrangian particle model and its application in street canyon air dispersion modelling

TitleA concentration correction scheme for Lagrangian particle model and its application in street canyon air dispersion modelling
Authors
KeywordsMicro-Scale
Numerical Simulation
Particle Trajectories
Pollutant Dispersion
Issue Date2001
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenv
Citation
Atmospheric Environment, 2001, v. 35 n. 33, p. 5779-5788 How to Cite?
AbstractPollutant dispersion in street canyons with various configurations was simulated by discharging a large number of particles into the computation domain after developing a time-dependent wind field. Trajectory of the released particles was predicted using a Lagrangian particle model developed in an earlier study. A concentration correction scheme, based on the concept of 'visibility', was adopted for the Lagrangian particle model to correct the calculated pollutant concentration field in street canyons. The corrected concentrations compared favourably with those from wind tunnel experiments and a linear relationship between the computed concentrations and wind tunnel data were found. The developed model was then applied to four simulations to test for the suitability of the correction scheme and to study pollutant distribution in street canyons with different configurations. For those cases with obstacles presence in the computation domain, the correction scheme gives more reasonable results compared with the one without using it. Different flow regimes are observed in the street canyons, which depend on building configurations. A counter-clockwise rotating vortex may appear in a two-building case with wind flow from left to right, causing lower pollutant concentration at the leeward side of upstream building and higher concentration at the windward side of downstream building. On the other hand, a stable clockwise rotating vortex is formed in the street canyon with multiple identical buildings, resulting in poor natural ventilation in the street canyon. Moreover, particles emitted in the downstream canyon formed by buildings with large height-to-width ratios will be transported to upstream canyons. Copyright © 2001 Elsevier Science Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/156568
ISSN
2015 Impact Factor: 3.459
2015 SCImago Journal Rankings: 1.999
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXia, Jen_US
dc.contributor.authorLeung, DYCen_US
dc.date.accessioned2012-08-08T08:43:00Z-
dc.date.available2012-08-08T08:43:00Z-
dc.date.issued2001en_US
dc.identifier.citationAtmospheric Environment, 2001, v. 35 n. 33, p. 5779-5788en_US
dc.identifier.issn1352-2310en_US
dc.identifier.urihttp://hdl.handle.net/10722/156568-
dc.description.abstractPollutant dispersion in street canyons with various configurations was simulated by discharging a large number of particles into the computation domain after developing a time-dependent wind field. Trajectory of the released particles was predicted using a Lagrangian particle model developed in an earlier study. A concentration correction scheme, based on the concept of 'visibility', was adopted for the Lagrangian particle model to correct the calculated pollutant concentration field in street canyons. The corrected concentrations compared favourably with those from wind tunnel experiments and a linear relationship between the computed concentrations and wind tunnel data were found. The developed model was then applied to four simulations to test for the suitability of the correction scheme and to study pollutant distribution in street canyons with different configurations. For those cases with obstacles presence in the computation domain, the correction scheme gives more reasonable results compared with the one without using it. Different flow regimes are observed in the street canyons, which depend on building configurations. A counter-clockwise rotating vortex may appear in a two-building case with wind flow from left to right, causing lower pollutant concentration at the leeward side of upstream building and higher concentration at the windward side of downstream building. On the other hand, a stable clockwise rotating vortex is formed in the street canyon with multiple identical buildings, resulting in poor natural ventilation in the street canyon. Moreover, particles emitted in the downstream canyon formed by buildings with large height-to-width ratios will be transported to upstream canyons. Copyright © 2001 Elsevier Science Ltd.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.subjectMicro-Scaleen_US
dc.subjectNumerical Simulationen_US
dc.subjectParticle Trajectoriesen_US
dc.subjectPollutant Dispersionen_US
dc.titleA concentration correction scheme for Lagrangian particle model and its application in street canyon air dispersion modellingen_US
dc.typeArticleen_US
dc.identifier.emailLeung, DYC: ycleung@hku.hken_US
dc.identifier.authorityLeung, DYC=rp00149en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S1352-2310(01)00358-2en_US
dc.identifier.scopuseid_2-s2.0-0034764607en_US
dc.identifier.hkuros67290-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034764607&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume35en_US
dc.identifier.issue33en_US
dc.identifier.spage5779en_US
dc.identifier.epage5788en_US
dc.identifier.isiWOS:000172354900009-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridXia, J=7402327322en_US
dc.identifier.scopusauthoridLeung, DYC=7203002484en_US

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