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                            Parameteranalysisandcalculationmethodofmovingbedresistance

                                                                                   2
                                                                        1
                                                             1
                                            1
                                      LILinqi,ZHANGHongwu,HOULin,LIHaobo
                          (1.DepartmentofHydraulicsandHydropowerEngineering,TsinghuaUniversity,Beijing 100084,China;
                   2.SchoolofScience(Geospatial),RoyalMelbourneInstituteofTechnology(RMIT)University,Melbourne,VIC 3001,Australia)
                  Abstract:Thecalculationmethodofmovablebedresistanceisveryimportanttothestudyofriverdynamicsand
                  thesolutionofengineeringproblems.Sincethemiddleofthe20thcentury ,methodsforcalculatingtheresistance
                  haveappearedoneafteranother.Inthispaper,theexistingresearchresultsaredescribed,andtheclassicalEin
                  steinandQianNing (N.Chien)resistancecalculationmethodsareanalyzedindetail.Itisfoundthatthecalculation
                  methodofmovablebedresistancebasedonhydraulicradiussplithypothesisisnotsuitableforthebedformwhichis
                  mainlydetermined by suspended load sedimenttransportintensity.Therefore , this paper firstly selects
                  representativephysicalquantitiesandcarriesoutcorrelationanalysiswithmeasuredroughnessvaluestodetermine
                  themainparameters.Theindexesofwaterdepthandenergyslopearedeterminedbydataanalysis.Theenergyslope
                  ismainlycomposedofriverbedgradientandlocalheadloss ,thegradientofriverbediscalculatedbyusingthefor
                  mulaofmediansizeofbedloadunderdominantdischarge.Theintroductionofvorticesparametercanreflectthein
                  fluenceofsedimentcontentonmovablebedresistance.Inconclusion ,anewmethodforcalculatingtheresistance
                  ofmovablebedisestablished.Verificationresultsofalargenumberofmeasureddatashowthattheformulainthis
                  paperhashighcalculationaccuracyandstrongapplicability.
                  Keywords:movablebedresistance;roughness;alluvialriver;YellowRiver;energyslope

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