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                        StudyoncalculationofflowresistanceandriverbedslopeoftheYellowRiver
                                                               1
                                              1
                                                                         1
                                                                                  2
                                       HOULin,ZHANGHongwu,LILinqi,LIXiji
                          (1.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing 100084,China;
                                   2.ShandongWeifangPumpedStorageCo.,Ltd.,Weifang 262600,China)
                  Abstract:Thestudyofflowbedresistanceinalluvialriverhasasignificantimpactonfloodevolutionandriverbed
                  deformation.Therefore,thisarticlefirstanalyzesthecorrelationbetweenmultiplesinglehydraulicfactors,dimen
                  sionlesshydraulicparametersandroughnesscoefficientsusingthefieldtestdatafrom thelowerreachesofthe
                  YellowRiver.Itconcludesthattheprimaryhydraulicfactorsinfluencingroughnessarewaterdepth,slope,sedi
                  mentconcentration ,andlongitudinalstabilitycoefficientoftheriverchannel.Subsequently,basedonthegeneral
                  expressionofZhang’sflowvelocityandprinciplesofriverdynamics,thestudydeterminesindicesforwaterdepth
                  andslope ,whichreflecttheeffectsofphysicalcharacteristicssuchasvelocitygradients,riverbedstability,and
                  sedimenttransportintensityonhydraulicresistance.Then ,aformulaforcalculatingriverbedslopeandhydraulic
                  energyslopeisproposed ,whichavoidsusingsurfaceslopevalueswithsignificantobservationerrorstodirectlysub
                  stitutethehydraulicgradient , therebyenhancingtheaccuracyofroughnesscalculations.Finally, aformula
                  suitablefortheYellowRiverwasestablished ,whichcanbeusedtocalculatetheflowresistancewithonlyafew
                  measuredparameters.Verifiedby3188setsofmeasureddatafrom themainandtributariesoftheYellowRiver ,
                  theroughnesscalculatedusingthismethodisquitesimilartothemeasuredvalues,withacorrelationcoefficientof
                  0.894andarelativeerrorofonly16.5%.Themethodinthispapercanprovidetheoreticalsupportforthecalcula
                  tionofwaterflowresistanceintheYellowRiver.
                  Keywords:flowresistance;riverbedslope;theYellowRiver;roughness;longitudinalstabilitycoefficientofriver
                  bed


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