Physical Modeling of Localized Scour for the Yangtze Estuary Waterway Improvement Project, Phase-中国Betway体育网页登陆

摘要 Inordertoexaminetheeffectivenessofengineeringprotectionagainstlocalizedscourinfrontofthesouthgroin-groupoftheYangtzeEstuaryWaterwayImprovementProject,PhaseI,anundistort-edphysicalmodelonageometricscaleof1:250isbuiltinthisstudy,coveringtwogroinsandtheiradacentestuarineareas.Byuseofrinsingfix-bedmodelaswellaslocalizedmobile-bedmodel,theexperimentisundertakenunderbi-directionalsteadyflow.Accordingtotheexperimentalresults,waterwaydredgingleadstotheincreaseinsteramvelocity,theincreasebeinglargerduringtheebbthanduringtheflood.Con-structionoftheupstreamgroinhassomeinfluenceontheflowpatternsnearthedownstreamgroin.Local-izedscourinfrontofthegroin-headsiscontrolledmainlybyebbflow.Inthecaseofariverbedcomposedentirelyofsilt,thedepthsoflocalizedscourinfrontofthetwogroin-headsare27mand29m,respectively.Inreality,theunderneathsedimentoftheprototyperiverbedisclaywhosethresholdve

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Physical Modeling of Localized Scour for the Yangtze Estuary Waterway Improvement Project, Phase

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