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Article: Distributed entrainment sink approach for modeling mixing and transport in the intermediate field

TitleDistributed entrainment sink approach for modeling mixing and transport in the intermediate field
Authors
KeywordsAsia
Coupling
Environmental impacts
Fish management
Plumes
Urban areas
Issue Date2007
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/hy.html
Citation
Journal of Hydraulic Engineering, 2007, v. 133 n. 7, p. 804-815 How to Cite?
AbstractIn densely populated coastal cities in Asia, wastewater outfalls are often located not far from sensitive areas such as beaches or shellfisheries. The impact and risk assessment of effluent discharges poses particular technical challenges, as pollutant concentration needs to be accurately predicted both in the near field and intermediate field. The active mixing close to the discharge can be modeled by proven plume models, while the fate and transport far beyond the mixing zone can be well-predicted by three-dimensional (3D) circulation models based on the hydrostatic pressure approximation. These models are usually applied separately with essentially one-way coupling; the action of the plume mixing on the external flow is neglected. Important phenomena such as surface buoyant spread or source-induced changes in ambient stratification cannot be satisfactorily addressed by such an approach. A Distributed Entrainment Sink Approach is proposed to model effluent mixing and transport in the intermediate field by dynamic coupling of a 3D far field shallow water circulation model with a Lagrangian near-field plume model. The action of the plume on the surrounding flow is modeled by a distribution of sinks along the plume trajectory and an equivalent diluted source flow at the predicted terminal height of rise. In this way, a two-way dynamic link can be established at grid cell level between the near and far-field models. The method is demonstrated for a number of complex flows including the interaction of a confined rising plume with ambient stratification, and the mixing of a line plume in cross flow. Numerical predictions are in excellent agreement with basic laboratory data. The general method can be readily incorporated in existing circulation models to yield accurate predictions of mixing and transport in the intermediate/far field. © 2007 ASCE.
Persistent Identifierhttp://hdl.handle.net/10722/150417
ISSN
2015 Impact Factor: 1.284
2015 SCImago Journal Rankings: 0.908
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChoi, DKWen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2012-06-26T06:04:34Z-
dc.date.available2012-06-26T06:04:34Z-
dc.date.issued2007en_HK
dc.identifier.citationJournal of Hydraulic Engineering, 2007, v. 133 n. 7, p. 804-815en_HK
dc.identifier.issn0733-9429en_HK
dc.identifier.urihttp://hdl.handle.net/10722/150417-
dc.description.abstractIn densely populated coastal cities in Asia, wastewater outfalls are often located not far from sensitive areas such as beaches or shellfisheries. The impact and risk assessment of effluent discharges poses particular technical challenges, as pollutant concentration needs to be accurately predicted both in the near field and intermediate field. The active mixing close to the discharge can be modeled by proven plume models, while the fate and transport far beyond the mixing zone can be well-predicted by three-dimensional (3D) circulation models based on the hydrostatic pressure approximation. These models are usually applied separately with essentially one-way coupling; the action of the plume mixing on the external flow is neglected. Important phenomena such as surface buoyant spread or source-induced changes in ambient stratification cannot be satisfactorily addressed by such an approach. A Distributed Entrainment Sink Approach is proposed to model effluent mixing and transport in the intermediate field by dynamic coupling of a 3D far field shallow water circulation model with a Lagrangian near-field plume model. The action of the plume on the surrounding flow is modeled by a distribution of sinks along the plume trajectory and an equivalent diluted source flow at the predicted terminal height of rise. In this way, a two-way dynamic link can be established at grid cell level between the near and far-field models. The method is demonstrated for a number of complex flows including the interaction of a confined rising plume with ambient stratification, and the mixing of a line plume in cross flow. Numerical predictions are in excellent agreement with basic laboratory data. The general method can be readily incorporated in existing circulation models to yield accurate predictions of mixing and transport in the intermediate/far field. © 2007 ASCE.en_HK
dc.languageengen_US
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/hy.htmlen_HK
dc.relation.ispartofJournal of Hydraulic Engineeringen_HK
dc.rightsJournal of Hydraulic Engineering. Copyright © American Society of Civil Engineers.-
dc.subjectAsiaen_HK
dc.subjectCouplingen_HK
dc.subjectEnvironmental impactsen_HK
dc.subjectFish managementen_HK
dc.subjectPlumesen_HK
dc.subjectUrban areasen_HK
dc.titleDistributed entrainment sink approach for modeling mixing and transport in the intermediate fielden_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9429&volume=133&issue=7&spage=804&epage=815&date=2007&atitle=Distributed+entrainment+sink+approach+for+modelling+mixing+and+transport+in+intermediate+field-
dc.identifier.emailChoi, DKW: choidkw@hkucc.hku.hken_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityChoi, KW=rp00107en_HK
dc.identifier.authorityLee, JW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1061/(ASCE)0733-9429(2007)133:7(804)en_HK
dc.identifier.scopuseid_2-s2.0-34347212170en_HK
dc.identifier.hkuros132237-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34347212170&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume133en_HK
dc.identifier.issue7en_HK
dc.identifier.spage804en_HK
dc.identifier.epage815en_HK
dc.identifier.isiWOS:000247388600008-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridChoi, KW=25627214800en_HK
dc.identifier.scopusauthoridLee, JW=36078318900en_HK

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