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Article: Numerical determination of flushing time for stratified water bodies

TitleNumerical determination of flushing time for stratified water bodies
Authors
KeywordsDensity stratification
Flushing time
Numerical model
Three-dimensional modelling
Tidal flushing
Tracer experiment
Water quality
Issue Date2004
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jmarsys
Citation
Journal Of Marine Systems, 2004, v. 50 n. 3-4, p. 263-281 How to Cite?
AbstractIt is often advantageous to model a semi-enclosed estuarine or coastal embayment (e.g. fish farms or tidal inlets, or typhoon shelters) as a separate system within a larger water body connected to the outer sea. The water quality of the system depends crucially on its flushing time - the average time of a particle in the system. The flushing time is governed by the barotropic and baroclinic tidal exchanges between the system and the outer sea. We describe herein a general method to determine systematically the flushing time of a stratified water body via a numerical tracer experiment. Numerical solution of the 3D flow and mass transport equations for many practical problems show that the tracer mass removal process depends on the physical topography and bathymetry, tidal range and the degree of stratification in the outer sea. Field application suggests that the tracer mass variation can be well approximated by a double-exponential decay curve that can be described by three flushing coefficients. Using a simple analytical two-segment model, the flushing coefficients can be given a clear physical interpretation, and the flushing time can be easily determined in terms of the coefficients. The method is illustrated by application to a number of tidal inlets in Hong Kong, in both the dry and wet season. The connection between the numerically determined flushing time and the traditional bulk flushing time obtained from salt-balance methods is established. © 2004 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/48539
ISSN
2015 Impact Factor: 2.174
2015 SCImago Journal Rankings: 1.092
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChoi, KWen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2008-05-22T04:16:37Z-
dc.date.available2008-05-22T04:16:37Z-
dc.date.issued2004en_HK
dc.identifier.citationJournal Of Marine Systems, 2004, v. 50 n. 3-4, p. 263-281en_HK
dc.identifier.issn0924-7963en_HK
dc.identifier.urihttp://hdl.handle.net/10722/48539-
dc.description.abstractIt is often advantageous to model a semi-enclosed estuarine or coastal embayment (e.g. fish farms or tidal inlets, or typhoon shelters) as a separate system within a larger water body connected to the outer sea. The water quality of the system depends crucially on its flushing time - the average time of a particle in the system. The flushing time is governed by the barotropic and baroclinic tidal exchanges between the system and the outer sea. We describe herein a general method to determine systematically the flushing time of a stratified water body via a numerical tracer experiment. Numerical solution of the 3D flow and mass transport equations for many practical problems show that the tracer mass removal process depends on the physical topography and bathymetry, tidal range and the degree of stratification in the outer sea. Field application suggests that the tracer mass variation can be well approximated by a double-exponential decay curve that can be described by three flushing coefficients. Using a simple analytical two-segment model, the flushing coefficients can be given a clear physical interpretation, and the flushing time can be easily determined in terms of the coefficients. The method is illustrated by application to a number of tidal inlets in Hong Kong, in both the dry and wet season. The connection between the numerically determined flushing time and the traditional bulk flushing time obtained from salt-balance methods is established. © 2004 Elsevier B.V. All rights reserved.en_HK
dc.format.extent1097918 bytes-
dc.format.extent425172 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jmarsysen_HK
dc.relation.ispartofJournal of Marine Systemsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsJournal of Marine Systems. Copyright © Elsevier BV.en_HK
dc.subjectDensity stratificationen_HK
dc.subjectFlushing timeen_HK
dc.subjectNumerical modelen_HK
dc.subjectThree-dimensional modellingen_HK
dc.subjectTidal flushingen_HK
dc.subjectTracer experimenten_HK
dc.subjectWater qualityen_HK
dc.titleNumerical determination of flushing time for stratified water bodiesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0924-7963&volume=50&issue=3-4&spage=263&epage=281&date=2004&atitle=Numerical+determination+of+flushing+time+for+stratified+waterbodiesen_HK
dc.identifier.emailChoi, KW: choidkw@hkucc.hku.hken_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityChoi, KW=rp00107en_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturepostprinten_HK
dc.identifier.doi10.1016/j.jmarsys.2004.04.005en_HK
dc.identifier.scopuseid_2-s2.0-5144229932en_HK
dc.identifier.hkuros90866-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-5144229932&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume50en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage263en_HK
dc.identifier.epage281en_HK
dc.identifier.isiWOS:000224842900007-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridChoi, KW=25627214800en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK

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