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Conference Paper: Reactive plume dispersion model over idealized urban roughness in the urban atmospheric boundary layer
Title | Reactive plume dispersion model over idealized urban roughness in the urban atmospheric boundary layer |
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Authors | |
Issue Date | 2017 |
Citation | American Meteorological Society 97th Annual Meeting (AMS 2017), Seattle, USA, 22-26 January 2017 How to Cite? |
Abstract | Gaussian plume dispersion model is commonly adopted to represent the pollutant concentration distribution after a continuous emission. However, most air pollutants are chemically reactive that evolve to their secondary counterparts in the atmospheric boundary layer (ABL). The conventional Gaussian plume model, which assumes inert pollutants, should be used with caution. In this study, the plume dispersion of a representative, irreversible chemical reaction, oxidation of nitric oxide (NO) to nitrogen dioxide (NO2) by ozone (O3) titration, is examined by large-eddy simulation (LES). The reactive plume dispersion over an idealized urban surface is employed to elucidate the coupled processes of turbulent transport and chemical reactions. A surface-depletion model, which is derived from the Gaussian plume model, is adopted to handle the chemical reactions. It reduces the emission strength as a function of downstream distance according to the chemical reactions (depletion of the source). Six different scenarios with different initial O3 concentrations (1 ppb, 10 ppb, 50 ppb, 100 ppb, 200 ppb and 500 ppb) are studied to investigate the plume dispersion of chemically reactive pollutant. The current LES data are validated by wind tunnel measurements. The accuracy of the depletion model is tested by the LES data as well. |
Description | 13th Symposium of the Urban Environment: Poster Session 1 Urban Canopy and Roughness Sublayers - Posters: no. 267 |
Persistent Identifier | http://hdl.handle.net/10722/247854 |
DC Field | Value | Language |
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dc.contributor.author | Wu, Z | - |
dc.contributor.author | Liu, CH | - |
dc.date.accessioned | 2017-10-18T08:33:43Z | - |
dc.date.available | 2017-10-18T08:33:43Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | American Meteorological Society 97th Annual Meeting (AMS 2017), Seattle, USA, 22-26 January 2017 | - |
dc.identifier.uri | http://hdl.handle.net/10722/247854 | - |
dc.description | 13th Symposium of the Urban Environment: Poster Session 1 Urban Canopy and Roughness Sublayers - Posters: no. 267 | - |
dc.description.abstract | Gaussian plume dispersion model is commonly adopted to represent the pollutant concentration distribution after a continuous emission. However, most air pollutants are chemically reactive that evolve to their secondary counterparts in the atmospheric boundary layer (ABL). The conventional Gaussian plume model, which assumes inert pollutants, should be used with caution. In this study, the plume dispersion of a representative, irreversible chemical reaction, oxidation of nitric oxide (NO) to nitrogen dioxide (NO2) by ozone (O3) titration, is examined by large-eddy simulation (LES). The reactive plume dispersion over an idealized urban surface is employed to elucidate the coupled processes of turbulent transport and chemical reactions. A surface-depletion model, which is derived from the Gaussian plume model, is adopted to handle the chemical reactions. It reduces the emission strength as a function of downstream distance according to the chemical reactions (depletion of the source). Six different scenarios with different initial O3 concentrations (1 ppb, 10 ppb, 50 ppb, 100 ppb, 200 ppb and 500 ppb) are studied to investigate the plume dispersion of chemically reactive pollutant. The current LES data are validated by wind tunnel measurements. The accuracy of the depletion model is tested by the LES data as well. | - |
dc.language | eng | - |
dc.relation.ispartof | Annual Meeting of the American Meteorological Society, AMS 2017 | - |
dc.title | Reactive plume dispersion model over idealized urban roughness in the urban atmospheric boundary layer | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Liu, CH: chliu@hkucc.hku.hk | - |
dc.identifier.authority | Liu, CH=rp00152 | - |
dc.identifier.hkuros | 281401 | - |