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Article: Transport mechanism of urban plume dispersion
Title | Transport mechanism of urban plume dispersion |
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Authors | |
Keywords | Aerodynamic resistance Plume dispersion Tracer flux Urban area Wind tunnel experiment |
Issue Date | 2019 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv |
Citation | Building and Environment, 2019, v. 161, p. article no. 106239 How to Cite? |
Abstract | Winds (advection) and turbulence (diffusion) are the driving forces for urban plume dispersion whose partitioning is complicated by urban morphology and the conditions of atmospheric surface layer (ASL). Wind tunnel parametric tests are conducted to examine the plume behavior in the turbulent boundary layers (TBLs) over hypothetical buildings (roughness elements of ribs and bricks) with drag coefficient Cd (= 2uτ 2/U∞ 2; where uτ and U∞ are, respectively, the friction velocity and the freestream velocity) varying from 4.7 × 10−3 to 10 × 10−3. Vehicular emission is modeled by atomizing water vapor via a ground-level line source in crossflows. The laboratory measurements show that the mean tracer concentrations ψ‾ exhibit the theoretical Gaussian form, supporting the classic plume dispersion framework. The horizontal advection tracer flux u‾ψ‾ dominates the transport processes compared with the vertical turbulent tracer flux w''ψ''‾. Increasing Cd leads to a decrease in u‾ψ‾ and an increase in w''ψ''‾ simultaneously, and vice versa. The changes in partitioning of transport processes in response to urban morphology imply that the conventional parameterization of dispersion coefficient σz (determined by atmospheric stability only) should be applied cautiously for urban setting. A new simple scheme of σz parameterization, which specifically accounts for the influence from urban roughness on the plume dispersion, is proposed. © 2019 Elsevier Ltd |
Persistent Identifier | http://hdl.handle.net/10722/297222 |
ISSN | 2021 Impact Factor: 7.093 2020 SCImago Journal Rankings: 1.736 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | MO, Z | - |
dc.contributor.author | Liu, CH | - |
dc.date.accessioned | 2021-03-08T07:15:54Z | - |
dc.date.available | 2021-03-08T07:15:54Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Building and Environment, 2019, v. 161, p. article no. 106239 | - |
dc.identifier.issn | 0360-1323 | - |
dc.identifier.uri | http://hdl.handle.net/10722/297222 | - |
dc.description.abstract | Winds (advection) and turbulence (diffusion) are the driving forces for urban plume dispersion whose partitioning is complicated by urban morphology and the conditions of atmospheric surface layer (ASL). Wind tunnel parametric tests are conducted to examine the plume behavior in the turbulent boundary layers (TBLs) over hypothetical buildings (roughness elements of ribs and bricks) with drag coefficient Cd (= 2uτ 2/U∞ 2; where uτ and U∞ are, respectively, the friction velocity and the freestream velocity) varying from 4.7 × 10−3 to 10 × 10−3. Vehicular emission is modeled by atomizing water vapor via a ground-level line source in crossflows. The laboratory measurements show that the mean tracer concentrations ψ‾ exhibit the theoretical Gaussian form, supporting the classic plume dispersion framework. The horizontal advection tracer flux u‾ψ‾ dominates the transport processes compared with the vertical turbulent tracer flux w''ψ''‾. Increasing Cd leads to a decrease in u‾ψ‾ and an increase in w''ψ''‾ simultaneously, and vice versa. The changes in partitioning of transport processes in response to urban morphology imply that the conventional parameterization of dispersion coefficient σz (determined by atmospheric stability only) should be applied cautiously for urban setting. A new simple scheme of σz parameterization, which specifically accounts for the influence from urban roughness on the plume dispersion, is proposed. © 2019 Elsevier Ltd | - |
dc.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv | - |
dc.relation.ispartof | Building and Environment | - |
dc.subject | Aerodynamic resistance | - |
dc.subject | Plume dispersion | - |
dc.subject | Tracer flux | - |
dc.subject | Urban area | - |
dc.subject | Wind tunnel experiment | - |
dc.title | Transport mechanism of urban plume dispersion | - |
dc.type | Article | - |
dc.identifier.email | Liu, CH: chliu@hkucc.hku.hk | - |
dc.identifier.authority | Liu, CH=rp00152 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.buildenv.2019.106239 | - |
dc.identifier.scopus | eid_2-s2.0-85068517092 | - |
dc.identifier.hkuros | 321531 | - |
dc.identifier.volume | 161 | - |
dc.identifier.spage | article no. 106239 | - |
dc.identifier.epage | article no. 106239 | - |
dc.identifier.isi | WOS:000476711100026 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0360-1323 | - |