简介：

简介：ObservationoftheoperationoftheSanmenxiaReservoirontheYellowRiverhasledtotheconclusionthattopreserveacertaineffectivestoragevolumeforreservoirsbuiltonheavilysilt-ladenriversisfeasibleifthereservoirisoperatedaccordingtotheprincipleknownas"storingtheclearwateranddischargingthemuddyflow".Therelativestabilityofthebedelevationattheendofthebackwaterandthereservoir'serosionanddepositionequilibriumdependonthecompatibilityofthepoollevelmaintainedinnon-floodseasonswiththeconditionsofflowandsedimentloadduringfloodseasons.OperatingthereservoirtoregulatethefloodandsedimentloadduringfloodseasonscanreducetherateofaggradationintheLowerYellowRiver.Thebasicconditionforapplyingtheoperationmodeof"storingtheclearwateranddischargingthemuddyflow"isthatasufficientamountofwatershouldbeusedfordischargingsedimentduringfloodseasons.Undertheconditionofextremelylowflowyears,reservoirsedimentationcannotbeavoidedevenifthisoperationmodeisadopted.

简介：

简介：Thepaperpresentsthe3DfiniteelementsimulationoftidalflowandSedimenttransportintheestuarineregionoftheHaiheriver.Theproposedmodeladoptssigma-transformationofthehydrodynamicandsedimenttransportequations.Thehydrodynamicandsedimenttransportmodelsareverifiedincaseofasimpletestproblemforwhichanalyticalsolutionsareavailable.FinallythemodelsareappliedtomuddyHaiheriverestuaryofNorthChinaanditisclaimedthathydrodynamicandsedimenttransportmodelsgiveareliablecomparisonwiththeobservedfielddata.However,therearecertaindiscrepancies,andsomereasonablequestionsregardingthepresentstate-of-art,inthemodelingofthree-dimensionalmultilevelhydrodynamicsandsedimenttransport,whichareprovidedbelowforanswer.