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Article: Rheological properties and incipient motion of cohesive sediment in the Haihe Estuary of China

TitleRheological properties and incipient motion of cohesive sediment in the Haihe Estuary of China
Authors
KeywordsCohesive sediment
Estuary and coast
Incipient motion
Rheological properties
Issue Date2002
PublisherHaiyang Chubanshe.
Citation
China Ocean Engineering, 2002, v. 16 n. 4, p. 483-498 How to Cite?
AbstractThe Haihe cohesive sediment, which is typical in China, is studied systematically for its basic physical and incipient motion properties. Following the requirements of dredging works in the Haihe Estuary, cohesive sediment samples were taken from three locations. Laboratory experiments were conducted to determine the rheological properties of these samples and to examine the incipient motion of the cohesive sediment. It is found that the cohesive sediment has an obvious yield stress τb, which increases with the mud density in a manner of an exponential function, and so does the viscosity parameter η. The cohesive sediment behaves like a Bingham fluid when its density is below 1.38 ∼ 1.40 g/cm3, and when denser than these values, it may become a power-law fluid. The incipient motion experiment also revealed that the incipient velocity of the cohesive sediment increases with the density in an exponential manner. Therefore, the incipient motion is primarily related to the density, which is different from the case for non-cohesive sediment in which the incipient motion is correlated with the diameter of sand particles instead. The incipient motion occurs in two different ways depending on the concentration of mud in the bottom. For sufficiently fine particles and a concentration lower than 1.20 g/cm3, the cohesive sediment appears as fluidized mud, and the incipient motion is in the form of instability of an internal wave. For a higher concentration, the cohesive sediment appears as general quasi-solid-mud, and the incipient motion can be described by a series of extended Shields curves each with a different porosity for newly deposited alluvial mud.
Persistent Identifierhttp://hdl.handle.net/10722/75729
ISSN
2015 Impact Factor: 0.435
2015 SCImago Journal Rankings: 0.422

 

DC FieldValueLanguage
dc.contributor.authorBai, YCen_HK
dc.contributor.authorNg, COen_HK
dc.contributor.authorShen, HTen_HK
dc.contributor.authorWang, SYen_HK
dc.date.accessioned2010-09-06T07:14:00Z-
dc.date.available2010-09-06T07:14:00Z-
dc.date.issued2002en_HK
dc.identifier.citationChina Ocean Engineering, 2002, v. 16 n. 4, p. 483-498en_HK
dc.identifier.issn0890-5487en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75729-
dc.description.abstractThe Haihe cohesive sediment, which is typical in China, is studied systematically for its basic physical and incipient motion properties. Following the requirements of dredging works in the Haihe Estuary, cohesive sediment samples were taken from three locations. Laboratory experiments were conducted to determine the rheological properties of these samples and to examine the incipient motion of the cohesive sediment. It is found that the cohesive sediment has an obvious yield stress τb, which increases with the mud density in a manner of an exponential function, and so does the viscosity parameter η. The cohesive sediment behaves like a Bingham fluid when its density is below 1.38 ∼ 1.40 g/cm3, and when denser than these values, it may become a power-law fluid. The incipient motion experiment also revealed that the incipient velocity of the cohesive sediment increases with the density in an exponential manner. Therefore, the incipient motion is primarily related to the density, which is different from the case for non-cohesive sediment in which the incipient motion is correlated with the diameter of sand particles instead. The incipient motion occurs in two different ways depending on the concentration of mud in the bottom. For sufficiently fine particles and a concentration lower than 1.20 g/cm3, the cohesive sediment appears as fluidized mud, and the incipient motion is in the form of instability of an internal wave. For a higher concentration, the cohesive sediment appears as general quasi-solid-mud, and the incipient motion can be described by a series of extended Shields curves each with a different porosity for newly deposited alluvial mud.en_HK
dc.languageengen_HK
dc.publisherHaiyang Chubanshe.en_HK
dc.relation.ispartofChina Ocean Engineeringen_HK
dc.subjectCohesive sedimenten_HK
dc.subjectEstuary and coasten_HK
dc.subjectIncipient motionen_HK
dc.subjectRheological propertiesen_HK
dc.titleRheological properties and incipient motion of cohesive sediment in the Haihe Estuary of Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0890-5487&volume=16&issue=4&spage=483&epage=498&date=2002&atitle=Rheological+properties+and+incipient+motion+of+cohesive+sediment+in+the+Haihe+Estuary+of+Chinaen_HK
dc.identifier.emailNg, CO:cong@hku.hken_HK
dc.identifier.authorityNg, CO=rp00224en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0036930064en_HK
dc.identifier.hkuros78466en_HK
dc.identifier.volume16en_HK
dc.identifier.issue4en_HK
dc.identifier.spage483en_HK
dc.identifier.epage498en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridBai, YC=7402572067en_HK
dc.identifier.scopusauthoridNg, CO=7401705594en_HK
dc.identifier.scopusauthoridShen, HT=8379460900en_HK
dc.identifier.scopusauthoridWang, SY=7410337320en_HK

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