简介：Transversemixingcharacteristicsofsoluteintheopenchannelflowcanprovideusefulinformationforriverenvironmentalmanagement.Thelateralmixingcoefficientisacrucialparameterforreproducingthetransversemixingeitherbynumericalsimulationorbyanalyticalprediction.Sincethesolutemixingcanbegreatlyaffectedbythelateralvariationsinwaterdepth,mixingcoefficientshouldbedeterminedineachsub-section(i.e.,themainchannel,sideslopeandfloodplain)separately.Inthisarticle,thetransversemixinginasymmetrictrapezoidalcompoundchannelwasstudiedbasedonlaboratorymeasurementoflongitudinalandtransversevelocitycomponentsandlateraldistributionofsoluteconcentration.ThelateralmixingcoefficientwasestimatedbyadoptingdifferentSchmidtnumbersindifferentsub-sectionsdividedaccordingtothedevelopingtrendoftheeddyviscosity,andfinallyapiecewiselinearprofileofmixingcoefficientwasadoptedtoanalyticallypredictthetransversesoluteconcentration.Thecomparisonbetweentheanalyticallypredicteddataandthemeasuringsoluteconcentrationprovedthatthisisaneffectivewaytoestimatethelateralmixingintheopenchannelflowwithlateralvariationsinwaterdepth.

简介：Experimentalresultswerecomparedwiththecomputedresultsobtainedfromtheninemostwell-knownmethodsforcomputationofdischargeinacompoundchannel.Theresultsdemonstrateahighaccuracyofthedividedchannelmethodwiththehorizontaldivisionlines,whilethelengthofdivisionlineisincludedwithinthecalculationofthewettedperimeter.Inaddition,asrelativedepthincreases,theresultsoftheallmethodsconvergetoeachotherandalsoincaseofsteeperslopesinlowerrelativedepths,moreagreementsbetweendifferentcalculatedmethodsandexperimentalresultswereobserved.Furthermore,theresultsshowtheeffectsofthemaximummomentumtransferonthehorizontalinterfacebetweenthemainchannelandfloodplains,whilefurtherangulardistancefromthehorizontalinterfacetowardtheverticalinterfacebetweenmainchannelandfloodplainscausesgradualdecreaseofmomentumtransfereffects.

简介：Thispaperaddressestheproblemoftherenormalizationgroupkturbulencemodelingofavegetatedmulti-stagecompoundchannel.ResultsfromMicroacousticDopplervelocimeter(ADV)testsareusedwithtimeandspatialaveraging(doubleaveragingmethod)intheanalysisoftheflowfieldandthecharacterization.Comparisonsofthemeanvelocity,theReynoldsstress,andtheturbulentenergydistributionshowthevalidityofthecomputationalmethod.Themeanvelocityprofileseesanobviousdecelerationintheterracesbecauseofvegetation.Secondaryflowexistsmainlyatthejunctionofthemainchannelandthevegetationregiononthefirstterrace.Thebedshearstressinthemainchannelismuchgreaterthanthatintheterraces.Thedifferenceofthebedshearstressbetweentwoterracesisinsignificant,andthepresenceofvegetationcaneffectivelyreducethebedshearstress.