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Article: Stormwater overflow in stepped channel

TitleStormwater overflow in stepped channel
Authors
KeywordsAerated flow
Channel bend
Physical model
Stepped channel
Supercritical flow
Trash rack
Urban drainage
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711617/description#description
Citation
Journal Of Hydro-Environment Research, 2008, v. 2 n. 2, p. 119-128 How to Cite?
AbstractSharp bends in drainage channels are sometimes engineered to suit local topography, especially in densely populated cities where land is limited. A hydraulic model study of a steep urban drainage channel is carried out to investigate the causes of an overflow incident in Hong Kong urban area, and to develop the drainage improvement measures to prevent flooding. The stepped drainage channel has a sharp bend in the middle and several trash racks are located along the channel. Experiments are performed on a 1:16 Froude scale model. In the first phase, experiments on a purposely built straight channel model are performed to study the bottom roughness of the stepped channel flow isolating the effect of the bend. After the straight channel experiments, four trash rack scenarios are tested in the exact model with detailed channel features. The flow in the drainage channel is supercritical and highly aerated. Based on the theory of skimming flow in stepped channels, a hydraulic assessment suggests that the bend and trash racks may be dominant causes of the overflow. The experiments show that sharp bend causes a spiral flow leading to significant lateral overflow. The trash racks are observed to generate a serious ski-jump type overshooting flow. It is found that the stormwater overshoot and flooding can be prevented by the repositioning of appropriately sized trash racks and the containment of the spiral flow. The proposed channel improvement design has been implemented on site and found to work successfully in heavy rainstorms after installation. The present study offers novel insights into the design of urban drainage works. © 2008.
Persistent Identifierhttp://hdl.handle.net/10722/58567
ISSN
2015 Impact Factor: 1.971
2015 SCImago Journal Rankings: 0.641
ISI Accession Number ID
Funding AgencyGrant Number
Drainage Service Department of Hong Kong Special Administrative Region, China
Funding Information:

The support of Drainage Service Department of Hong Kong Special Administrative Region, China, is acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorYu, Den_HK
dc.contributor.authorLee, JHWen_HK
dc.contributor.authorWong, CKCen_HK
dc.date.accessioned2010-05-31T03:32:38Z-
dc.date.available2010-05-31T03:32:38Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Hydro-Environment Research, 2008, v. 2 n. 2, p. 119-128en_HK
dc.identifier.issn1570-6443en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58567-
dc.description.abstractSharp bends in drainage channels are sometimes engineered to suit local topography, especially in densely populated cities where land is limited. A hydraulic model study of a steep urban drainage channel is carried out to investigate the causes of an overflow incident in Hong Kong urban area, and to develop the drainage improvement measures to prevent flooding. The stepped drainage channel has a sharp bend in the middle and several trash racks are located along the channel. Experiments are performed on a 1:16 Froude scale model. In the first phase, experiments on a purposely built straight channel model are performed to study the bottom roughness of the stepped channel flow isolating the effect of the bend. After the straight channel experiments, four trash rack scenarios are tested in the exact model with detailed channel features. The flow in the drainage channel is supercritical and highly aerated. Based on the theory of skimming flow in stepped channels, a hydraulic assessment suggests that the bend and trash racks may be dominant causes of the overflow. The experiments show that sharp bend causes a spiral flow leading to significant lateral overflow. The trash racks are observed to generate a serious ski-jump type overshooting flow. It is found that the stormwater overshoot and flooding can be prevented by the repositioning of appropriately sized trash racks and the containment of the spiral flow. The proposed channel improvement design has been implemented on site and found to work successfully in heavy rainstorms after installation. The present study offers novel insights into the design of urban drainage works. © 2008.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711617/description#descriptionen_HK
dc.relation.ispartofJournal of Hydro-Environment Researchen_HK
dc.subjectAerated flowen_HK
dc.subjectChannel benden_HK
dc.subjectPhysical modelen_HK
dc.subjectStepped channelen_HK
dc.subjectSupercritical flowen_HK
dc.subjectTrash racken_HK
dc.subjectUrban drainageen_HK
dc.titleStormwater overflow in stepped channelen_HK
dc.typeArticleen_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jher.2008.05.004en_HK
dc.identifier.scopuseid_2-s2.0-53149132377en_HK
dc.identifier.hkuros154912en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-53149132377&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume2en_HK
dc.identifier.issue2en_HK
dc.identifier.spage119en_HK
dc.identifier.epage128en_HK
dc.identifier.isiWOS:000207652500006-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridYu, D=55481575200en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK
dc.identifier.scopusauthoridWong, CKC=24475830600en_HK

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