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Article: Processes and mechanisms of dynamic channel adjustment to delta progradation: The case of the mouth channel of the Yellow River, China

TitleProcesses and mechanisms of dynamic channel adjustment to delta progradation: The case of the mouth channel of the Yellow River, China
Authors
KeywordsChannel adjustment
Delta progradation
Yellow River mouth
Issue Date2003
PublisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/2388
Citation
Earth Surface Processes And Landforms, 2003, v. 28 n. 6, p. 609-624 How to Cite?
AbstractThis paper analyses the processes and mechanisms of a three-stage channel adjustment over a cycle of the Yellow River mouth channel extension based on data comprising hydrologic measurements and channel geometric surveys. Rapid siltation in the mouth channel takes place in the young stage when the channel is being built by deposits and in the old stage when the channel cannot further adjust itself to keep sediment transport in equilibrium. It is disclosed that the bankfull width-depth ratio, bed material size and slope decrease in the young and mature stages but do not change in the old stage. The reduction of bankfull width-depth ratio and bed material size during the young and mature stages is found to be able to offset the effect of the slope reduction on sediment transport due to continuous mouth progradation. They reach their limits in old stage, and a constant slope is kept by unceasing sediment accumulation. The grain size composition of incoming sediment and the fining mechanism are responsible for the occurrence of lower limit of bed material size. The reason for the existence of a limit of bankfull cross-sectional shape is that the large flows can fully transport the sediment load they are carrying, and siltation in the channel in the old stage takes place mainly in the low flows. It is suggested that the bankfull discharge plays an important role in shaping the channel but that the entire channel form is the product of both the large and low flows plus the effects of interaction between them. Channel pattern change shows a process from a braided pattern in the young stage to a straight pattern in the mature and old stages, and the straight channel becomes gradually sinuous. The occurrence and transformation of the channel patterns are supported by two planform predictors, but are also facilitated by some other conditions. © 2003 John Wiley and Sons, Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/86395
ISSN
2015 Impact Factor: 3.505
2015 SCImago Journal Rankings: 1.574
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorShi, Cen_HK
dc.contributor.authorZhang, Den_HK
dc.date.accessioned2010-09-06T09:16:17Z-
dc.date.available2010-09-06T09:16:17Z-
dc.date.issued2003en_HK
dc.identifier.citationEarth Surface Processes And Landforms, 2003, v. 28 n. 6, p. 609-624en_HK
dc.identifier.issn0197-9337en_HK
dc.identifier.urihttp://hdl.handle.net/10722/86395-
dc.description.abstractThis paper analyses the processes and mechanisms of a three-stage channel adjustment over a cycle of the Yellow River mouth channel extension based on data comprising hydrologic measurements and channel geometric surveys. Rapid siltation in the mouth channel takes place in the young stage when the channel is being built by deposits and in the old stage when the channel cannot further adjust itself to keep sediment transport in equilibrium. It is disclosed that the bankfull width-depth ratio, bed material size and slope decrease in the young and mature stages but do not change in the old stage. The reduction of bankfull width-depth ratio and bed material size during the young and mature stages is found to be able to offset the effect of the slope reduction on sediment transport due to continuous mouth progradation. They reach their limits in old stage, and a constant slope is kept by unceasing sediment accumulation. The grain size composition of incoming sediment and the fining mechanism are responsible for the occurrence of lower limit of bed material size. The reason for the existence of a limit of bankfull cross-sectional shape is that the large flows can fully transport the sediment load they are carrying, and siltation in the channel in the old stage takes place mainly in the low flows. It is suggested that the bankfull discharge plays an important role in shaping the channel but that the entire channel form is the product of both the large and low flows plus the effects of interaction between them. Channel pattern change shows a process from a braided pattern in the young stage to a straight pattern in the mature and old stages, and the straight channel becomes gradually sinuous. The occurrence and transformation of the channel patterns are supported by two planform predictors, but are also facilitated by some other conditions. © 2003 John Wiley and Sons, Ltd.en_HK
dc.languageengen_HK
dc.publisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/2388en_HK
dc.relation.ispartofEarth Surface Processes and Landformsen_HK
dc.rightsEarth Surface processes and Landforms. Copyright © John Wiley & Sons Ltd.en_HK
dc.subjectChannel adjustmenten_HK
dc.subjectDelta progradationen_HK
dc.subjectYellow River mouthen_HK
dc.titleProcesses and mechanisms of dynamic channel adjustment to delta progradation: The case of the mouth channel of the Yellow River, Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0197-9337&volume=28&spage=609&epage=624&date=2003&atitle=Processes+and+mechanisms+of+dynamic+channel+adjustment+to+delta+progradation:+The+case+of+the+mouth+channel+of+the+Yellow+River,+Chinaen_HK
dc.identifier.emailZhang, D:zhangd@hkucc.hku.hken_HK
dc.identifier.authorityZhang, D=rp00649en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/esp.465en_HK
dc.identifier.scopuseid_2-s2.0-0041814469en_HK
dc.identifier.hkuros80920en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0041814469&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume28en_HK
dc.identifier.issue6en_HK
dc.identifier.spage609en_HK
dc.identifier.epage624en_HK
dc.identifier.isiWOS:000183970600003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridShi, C=7402120739en_HK
dc.identifier.scopusauthoridZhang, D=9732911600en_HK

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