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Article: Hydraulic jet control for river junction design of Yuen Long Bypass Floodway, Hong Kong

TitleHydraulic jet control for river junction design of Yuen Long Bypass Floodway, Hong Kong
Authors
KeywordsFloods
Hong Kong
Hydraulic jump
Numerical models
Rivers
Issue Date2008
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, 2008, v. 134 n. 1, p. 23-33 How to Cite?
AbstractThe Yuen Long Bypass Floodway (YLBF) was designed to collect flows from the Sham Chung River (SCR) and the San Hui Nullah (SHN) and to serve as a diversion channel of the Yuen Long Main Nullah (YLMN). Under a 200-year return period design condition, the floodway was designed (1) to divert a flow of approximately 38 m3s from the supercritical YLMN flow and (2) to convey a total combined flow of 278 m3/s to downstream within acceptable flood levels. The success of the design depends critically on complicated junction flow interactions that cannot be resolved by 1D unsteady flow models. These features include the supercritical-subcritical flow transition at the San Hui-Floodway (SHN-YLBF) junction and the diversion of part of the supercritical flow from the Main Nullah (YLMN). A laboratory Froude scale physical model was constructed to study water stages and flow characteristics in the floodway and to investigate optimal design arrangements at channel junctions and transitions. This paper summarizes the main features of the unique river junction network, in particular the use of the hydraulic jet principle at the SHN-YLBF junction to lower flood levels. In addition, a numerical flow model is employed to study flow details at the river junctions. The model is based on the general 2D shallow water equations in strong conservation form. The equations are discretized using the total variation diminishing finite-volume method which captures the discontinuity in hydraulic jumps. The numerical model predictions are well supported by the laboratory data, and the theoretical and experimental results offer useful insights for the design of urban flood control schemes under tight space constraints. © ASCE 2008.
Persistent Identifierhttp://hdl.handle.net/10722/71115
ISSN
2015 Impact Factor: 1.284
2015 SCImago Journal Rankings: 0.908
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorArega, Fen_HK
dc.contributor.authorLee, JHWen_HK
dc.contributor.authorTang, HWen_HK
dc.date.accessioned2010-09-06T06:29:02Z-
dc.date.available2010-09-06T06:29:02Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Hydraulic Engineering, 2008, v. 134 n. 1, p. 23-33en_HK
dc.identifier.issn0733-9429en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71115-
dc.description.abstractThe Yuen Long Bypass Floodway (YLBF) was designed to collect flows from the Sham Chung River (SCR) and the San Hui Nullah (SHN) and to serve as a diversion channel of the Yuen Long Main Nullah (YLMN). Under a 200-year return period design condition, the floodway was designed (1) to divert a flow of approximately 38 m3s from the supercritical YLMN flow and (2) to convey a total combined flow of 278 m3/s to downstream within acceptable flood levels. The success of the design depends critically on complicated junction flow interactions that cannot be resolved by 1D unsteady flow models. These features include the supercritical-subcritical flow transition at the San Hui-Floodway (SHN-YLBF) junction and the diversion of part of the supercritical flow from the Main Nullah (YLMN). A laboratory Froude scale physical model was constructed to study water stages and flow characteristics in the floodway and to investigate optimal design arrangements at channel junctions and transitions. This paper summarizes the main features of the unique river junction network, in particular the use of the hydraulic jet principle at the SHN-YLBF junction to lower flood levels. In addition, a numerical flow model is employed to study flow details at the river junctions. The model is based on the general 2D shallow water equations in strong conservation form. The equations are discretized using the total variation diminishing finite-volume method which captures the discontinuity in hydraulic jumps. The numerical model predictions are well supported by the laboratory data, and the theoretical and experimental results offer useful insights for the design of urban flood control schemes under tight space constraints. © ASCE 2008.en_HK
dc.languageengen_HK
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.en_HK
dc.subjectFloodsen_HK
dc.subjectHong Kongen_HK
dc.subjectHydraulic jumpen_HK
dc.subjectNumerical modelsen_HK
dc.subjectRiversen_HK
dc.titleHydraulic jet control for river junction design of Yuen Long Bypass Floodway, Hong Kongen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9429&volume=134&issue=1&spage=23&epage=33&date=2008&atitle=Hydraulic+jet+control+for+river+junction+design+of+Yuen+Long+Bypass+Floodway,+Hong+Kongen_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1061/(ASCE)0733-9429(2008)134:1(23)en_HK
dc.identifier.scopuseid_2-s2.0-37549017312en_HK
dc.identifier.hkuros154837en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-37549017312&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume134en_HK
dc.identifier.issue1en_HK
dc.identifier.spage23en_HK
dc.identifier.epage33en_HK
dc.identifier.isiWOS:000252435500003-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridArega, F=6506075469en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK
dc.identifier.scopusauthoridTang, HW=8709032000en_HK

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