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dc.contributor.authorLi, Xianxiang
dc.contributor.authorBritter, Rex E
dc.contributor.authorNorford, Leslie Keith
dc.date.accessioned2020-03-24T19:10:13Z
dc.date.available2020-03-24T19:10:13Z
dc.date.issued2016-08
dc.date.submitted2016-08
dc.identifier.issn1352-2310
dc.identifier.urihttps://hdl.handle.net/1721.1/124291
dc.description.abstractThis study employs a validated large-eddy simulation (LES) code with high tempo-spatial resolution to investigate the effect of a stably stratified roughness sublayer (RSL) on scalar transport within an urban street canyon. The major effect of stable stratification on the flow and turbulence inside the street canyon is that the flow slows down in both streamwise and vertical directions, a stagnant area near the street level emerges, and the vertical transport of momentum is weakened. Consequently, the transfer of heat between the street canyon and overlying atmosphere also gets weaker. The pollutant emitted from the street level ‘pools’ within the lower street canyon, and more pollutant accumulates within the street canyon with increasing stability. Under stable stratification, the dominant mechanism for pollutant transport within the street canyon has changed from ejections (flow carries high-concentration pollutant upward) to unorganized motions (flow carries high-concentration pollutant downward), which is responsible for the much lower dispersion efficiency under stable stratifications. Keywords: Large-eddy simulation (LES); Urban street canyon; Pollutant dispersion; Stable stratificationen_US
dc.description.sponsorshipNational Research Foundation Singaporeen_US
dc.language.isoen
dc.publisherElsevier BVen_US
dc.relation.isversionof10.1016/J.ATMOSENV.2016.08.069en_US
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs Licenseen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.sourceMIT web domainen_US
dc.titleEffect of stable stratification on dispersion within urban street canyons: A large-eddy simulationen_US
dc.typeArticleen_US
dc.identifier.citationLi, Xianxiang, et al. "Effect of stable stratification on dispersion within urban street canyons: A large-eddy simulation." Atmospheric Environment 144 (November 2016): 47-59 © 2016 Elsevier Ltden_US
dc.contributor.departmentSingapore-MIT Alliance in Research and Technology (SMART)en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Urban Studies and Planningen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Architectureen_US
dc.relation.journalAtmospheric Environmenten_US
dc.eprint.versionOriginal manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/NonPeerRevieweden_US
dc.date.updated2019-08-07T15:20:52Z
dspace.date.submission2019-08-07T15:20:54Z
mit.journal.volume144en_US


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