简介：Theflowthroughabreastwallspillwayisgreatlyaffectedbythecentripetalforceduetoadownstreamcurvedprofile.Therefore,themeanverticalpressuredistributionattheoutletsectionisnotconsistentwiththehydrostaticpressurelaw.Thisdistributioninturnaffectsthedischargecapacityofthebreastwallspillway.Thispaperexperimentallystudiestheeffectofaconvexdownstreamprofileonthemeanpressurevariationandthedischargeofabreastwallspillwaywithoutgates.Itisindicatedthattheeffectofthecurvilinearstreamlineonthemeanverticalpressurevariationissignificant.TheregressionanalysismethodisusedtodeterminethewaterheadeffectZooftheorificeopeningthroughthemeanpressurevariation.Adischargepredictionformulaofthebreastwallspillwayisobtainedunderthelimitedconditionsofalaboratoryflume.Thepredicteddischargeiscomparedtothemeasureddischarge.Agoodagreementisevidencedforthefreeorificeflowwitherrorswithin?5%,whileabigerror(20%orevenmore)isobtainedifthehydrostaticpressurelawisusedforthedeterminationofZo.

简介：

简介：

简介：Channelconfluencesareuniversallypresentinnature.Theycanbedividedintotwotypes:asymmetricalriverconfluencesandsymmetricriverconfluences.ThelatterisalsocalledastheY-shapedconfluences.Mostofpreviousworkhaspaidmoreattentiontotheasymmetricalriverconfluences,butfewstudieshavebeenconductedontheY-shapedconfluences.Inthisarticle,theeffectsofbeddiscordanceontheflowpatternsat'Y'shapedopen-channelconfluenceswerestudiedbyusinga3-Dnumericalsimulation.Itisprovedthatthemodelcanundertakequantitativeassessmentoftheflowatconfluences.TheresultsindicatethattherearealotofdifferencesbetweentheY-shapedconfluenceandasymmetricalconfluence.ThediscordantbedheightplaysanimportantroleattheY-shapedjunction.