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Conference Paper: Large-eddy simulation of pollutant dispersion over urban street canyons: local turbulence and local reactions
Title | Large-eddy simulation of pollutant dispersion over urban street canyons: local turbulence and local reactions |
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Authors | |
Issue Date | 2014 |
Publisher | American Meteorological Society. |
Citation | The 11th Symposium on the Urban Environment and 94th Annual Meeting of the American Meteorological Society, Atlanta, GA., 2-6 February 2014. How to Cite? |
Abstract | Pollutant dispersion in urban areas is a complicated process with the interaction between rough ground and chemical reactions. While the upper part of the pollutant plume dispersion from a line/point source resembles the Gaussian shape, its lower part is far from the traditional analytical solution because of the bottom surface roughness.
In this study, large-eddy simulation (LES) is employed to calculate the pollutant dispersion with bisubstrate chemical reactions in and over an array of idealized street canyon models. The flow is driven by a constant pressure gradient that is perpendicular to the streets. Thirty-six identical street canyons of unity aspect ratio are used as the roughness elements to initiate the turbulent flows. Reactant A is a kind of vehicular pollutant which is emitted from the ground surface of the first street canyon. Another reactant B, which is doped in the inlet of the boundary layer over the street canyons, reacts with reactant A producing reactant C. The chemical reactions are irreversible whose reaction rates are assumed to be constant. The velocity, turbulence and concentration data are collected downstream over the street canyons.
Local time scales of turbulence and chemical reaction are examined at every grid point to study the mechanism of pollutant dispersion with chemistry over urban areas. Turbulence intensity at the boundary of the pollutant plume is found to be important for the pollutant dilution and removal. |
Description | Session 2 - New-generation mesoscale to urban scale modeling capabilities for air pollution research and prediction (II): paper no. J2.1 |
Persistent Identifier | http://hdl.handle.net/10722/204223 |
DC Field | Value | Language |
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dc.contributor.author | Du, T | en_US |
dc.contributor.author | Liu, CH | en_US |
dc.contributor.author | Zhao, YB | en_US |
dc.date.accessioned | 2014-09-19T21:25:20Z | - |
dc.date.available | 2014-09-19T21:25:20Z | - |
dc.date.issued | 2014 | en_US |
dc.identifier.citation | The 11th Symposium on the Urban Environment and 94th Annual Meeting of the American Meteorological Society, Atlanta, GA., 2-6 February 2014. | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/204223 | - |
dc.description | Session 2 - New-generation mesoscale to urban scale modeling capabilities for air pollution research and prediction (II): paper no. J2.1 | - |
dc.description.abstract | Pollutant dispersion in urban areas is a complicated process with the interaction between rough ground and chemical reactions. While the upper part of the pollutant plume dispersion from a line/point source resembles the Gaussian shape, its lower part is far from the traditional analytical solution because of the bottom surface roughness. In this study, large-eddy simulation (LES) is employed to calculate the pollutant dispersion with bisubstrate chemical reactions in and over an array of idealized street canyon models. The flow is driven by a constant pressure gradient that is perpendicular to the streets. Thirty-six identical street canyons of unity aspect ratio are used as the roughness elements to initiate the turbulent flows. Reactant A is a kind of vehicular pollutant which is emitted from the ground surface of the first street canyon. Another reactant B, which is doped in the inlet of the boundary layer over the street canyons, reacts with reactant A producing reactant C. The chemical reactions are irreversible whose reaction rates are assumed to be constant. The velocity, turbulence and concentration data are collected downstream over the street canyons. Local time scales of turbulence and chemical reaction are examined at every grid point to study the mechanism of pollutant dispersion with chemistry over urban areas. Turbulence intensity at the boundary of the pollutant plume is found to be important for the pollutant dilution and removal. | - |
dc.language | eng | en_US |
dc.publisher | American Meteorological Society. | - |
dc.relation.ispartof | 11th Symposium on the Urban Environment and 94th AMS Annual Meeting 2014 | en_US |
dc.rights | 11th Symposium on the Urban Environment and 94th AMS Annual Meeting 2014. Copyright © American Meteorological Society. | - |
dc.rights | © Copyright 2014 American Meteorological Society (AMS). | - |
dc.title | Large-eddy simulation of pollutant dispersion over urban street canyons: local turbulence and local reactions | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Liu, CH: chliu@hkucc.hku.hk | en_US |
dc.identifier.authority | Liu, CH=rp00152 | en_US |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.hkuros | 238778 | en_US |
dc.publisher.place | United States | - |