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Conference Paper: Pollutant removal, dispersion, and entrainment over two-dimensional idealized street canyons

TitlePollutant removal, dispersion, and entrainment over two-dimensional idealized street canyons
Authors
Issue Date2011
Citation
The 13th International Conference on Wind Engineering (ICWE13), Amsterdam, The Netherlands, 10-15 July 2011. How to Cite?
AbstractIdealized two-dimensional (2D) street canyon models of unity building-height-to-street-width (aspect) ratio are employed to examine the pollutant transport over hypothetical urban areas. The results show that the pollutant removal is mainly governed by atmospheric turbulence when pollutant sources exist in the street canyons. Numerous decelerating, uprising air masses are located at the roof level, implying that the pollutant is removed from the street canyons to the urban boundary layer (UBL) by ejections. For the street canyons without pollutant source, the removal by ejections is limited leading to insignificant turbulent pollutant removal. The roof-level turbulent kinetic energy (TKE) distribution demonstrates that its production is not governed by local wind shear but the descending TKE from the UBL. In the UBL, the pollutant disperses rapidly over the buildings, exhibiting a Gaussian-plume shape. The vertical pollutant profiles illustrate a self-similarity behavior in the downstream region. Future studies will be focused on the characteristic plume shape over 2D idealized street canyons of different aspect ratios.
Persistent Identifierhttp://hdl.handle.net/10722/140371

 

DC FieldValueLanguage
dc.contributor.authorWong, CCCen_US
dc.contributor.authorLiu, CHen_US
dc.date.accessioned2011-09-23T06:10:42Z-
dc.date.available2011-09-23T06:10:42Z-
dc.date.issued2011en_US
dc.identifier.citationThe 13th International Conference on Wind Engineering (ICWE13), Amsterdam, The Netherlands, 10-15 July 2011.en_US
dc.identifier.urihttp://hdl.handle.net/10722/140371-
dc.description.abstractIdealized two-dimensional (2D) street canyon models of unity building-height-to-street-width (aspect) ratio are employed to examine the pollutant transport over hypothetical urban areas. The results show that the pollutant removal is mainly governed by atmospheric turbulence when pollutant sources exist in the street canyons. Numerous decelerating, uprising air masses are located at the roof level, implying that the pollutant is removed from the street canyons to the urban boundary layer (UBL) by ejections. For the street canyons without pollutant source, the removal by ejections is limited leading to insignificant turbulent pollutant removal. The roof-level turbulent kinetic energy (TKE) distribution demonstrates that its production is not governed by local wind shear but the descending TKE from the UBL. In the UBL, the pollutant disperses rapidly over the buildings, exhibiting a Gaussian-plume shape. The vertical pollutant profiles illustrate a self-similarity behavior in the downstream region. Future studies will be focused on the characteristic plume shape over 2D idealized street canyons of different aspect ratios.-
dc.languageengen_US
dc.relation.ispartofInternational Conference on Wind Engineeringen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titlePollutant removal, dispersion, and entrainment over two-dimensional idealized street canyonsen_US
dc.typeConference_Paperen_US
dc.identifier.emailLiu, CH: chliu@hkucc.hku.hken_US
dc.identifier.authorityLiu, CH=rp00152en_US
dc.description.naturepostprint-
dc.identifier.hkuros195816en_US
dc.description.otherThe 13th International Conference on Wind Engineering (ICWE13), Amsterdam, The Netherlands, 10-15 July 2011.-

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