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Article: Numerical and experimental study of unsteady salt water purging in Hong Kong sea outfall model

TitleNumerical and experimental study of unsteady salt water purging in Hong Kong sea outfall model
Authors
Issue Date2001
PublisherInternational Association of Hydraulic Engineering and Research.
Citation
Journal Of Hydraulic Research, 2001, v. 39 n. 1, p. 83-91 How to Cite?
AbstractBased on experiments on the 1:20 Hong Kong model diffuser, a numerical model for simulating seawater intrusion and purging process in an invertconnected outfall is developed. An extension of the theory of Guo and Sharp (1996), this is essentially a one dimensional unsteady flow model with locally 2D techniques to account for stratification and density changes at riser-tunnel junctions. Numerical predictions of purging flow and times are in good agreement with measurements; key features of the purging sequence are also well-supported by the synoptic observed riser flows. Both experiments and calculations demonstrate that, unlike a soffit-connected outfall, the seawater at the bottom of the tunnel is initially purged, and the mixing between effluent and seawater is much stronger. The purging sequence in invert-connected situation is usually from seaward end to landward end for unsteady and quasi-steady purging; however for steady purging the sequence is from landward end to seaward end as in soffit-connected outfalls. The presence of an effluent layer at the top of the tunnel (due to e.g. pump shutdown) results in a persistent circulation in the system. The numerical model also shows that shortening the outfall tunnel length by an artificial bend has an effect on the purging sequence and time, but not the purging flow. Two-layer purging occurs in steady purging process and can help reduce purging discharge rate, especially with a large number of risers. Salt-assisted purging is effective only if the duration of the process is sufficiently long; however, the effluent volume required can be larger than that in the pure effluent purging process.
Persistent Identifierhttp://hdl.handle.net/10722/71821
ISSN
2015 Impact Factor: 1.471
2015 SCImago Journal Rankings: 1.022
References

 

DC FieldValueLanguage
dc.contributor.authorLee, JHWen_HK
dc.contributor.authorGuo, ZRen_HK
dc.contributor.authorYau, TWCen_HK
dc.date.accessioned2010-09-06T06:35:28Z-
dc.date.available2010-09-06T06:35:28Z-
dc.date.issued2001en_HK
dc.identifier.citationJournal Of Hydraulic Research, 2001, v. 39 n. 1, p. 83-91en_HK
dc.identifier.issn0022-1686en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71821-
dc.description.abstractBased on experiments on the 1:20 Hong Kong model diffuser, a numerical model for simulating seawater intrusion and purging process in an invertconnected outfall is developed. An extension of the theory of Guo and Sharp (1996), this is essentially a one dimensional unsteady flow model with locally 2D techniques to account for stratification and density changes at riser-tunnel junctions. Numerical predictions of purging flow and times are in good agreement with measurements; key features of the purging sequence are also well-supported by the synoptic observed riser flows. Both experiments and calculations demonstrate that, unlike a soffit-connected outfall, the seawater at the bottom of the tunnel is initially purged, and the mixing between effluent and seawater is much stronger. The purging sequence in invert-connected situation is usually from seaward end to landward end for unsteady and quasi-steady purging; however for steady purging the sequence is from landward end to seaward end as in soffit-connected outfalls. The presence of an effluent layer at the top of the tunnel (due to e.g. pump shutdown) results in a persistent circulation in the system. The numerical model also shows that shortening the outfall tunnel length by an artificial bend has an effect on the purging sequence and time, but not the purging flow. Two-layer purging occurs in steady purging process and can help reduce purging discharge rate, especially with a large number of risers. Salt-assisted purging is effective only if the duration of the process is sufficiently long; however, the effluent volume required can be larger than that in the pure effluent purging process.en_HK
dc.languageengen_HK
dc.publisherInternational Association of Hydraulic Engineering and Research.en_HK
dc.relation.ispartofJournal of Hydraulic Researchen_HK
dc.titleNumerical and experimental study of unsteady salt water purging in Hong Kong sea outfall modelen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-1686&volume=39 &issue=1&spage=83 &epage= 91&date=2001&atitle=Numerical+and+experimental+study+of+unsteady+salt+water+purging+in+Hong+Kong+Sea+Outfall+Modelen_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0035057213en_HK
dc.identifier.hkuros59817en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035057213&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume39en_HK
dc.identifier.issue1en_HK
dc.identifier.spage83en_HK
dc.identifier.epage91en_HK
dc.publisher.placeSpainen_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK
dc.identifier.scopusauthoridGuo, ZR=7404657974en_HK
dc.identifier.scopusauthoridYau, TWC=37004093800en_HK

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