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                                   Researchonthechangeofhydrologicalregimeinthe
                                    YarlungZanboRiverBasinbasedonERHIsmethod

                                      1,2
                                                                             1
                                                                                            6
                                                 3,4,5
                                                                  1
                            YANGJing ,LINZiqi ,ZHAOQingxu,XIEJing,LIAOWeihong
                          (1.HuanengTibetHydropowerSafetyEngineeringTechnologyResearchCenter,Chengdu 610093,China;
                              2.CollegeofWaterResource&HydropowerofSichuanUniversity,Chengdu 610065,China;
                     3.SchoolofCivilandHydraulicEngineeringofHuazhongUniversityofScienceandTechnology,Wuhan 430072,China;
                              4.ChangjiangInstituteofSurvey,Planning,DesignandResearch,Wuhan 430010,China;
                        5.KeyLaboratoryofWaterGridProjectandRegulationofMinistryofWaterResources,Wuhan 430010,China;
                                  6.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,
                                 ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China)

                  Abstract:InordertoexplorethechangesofenvironmentalflowcomponentsandhydrologicalregimeintheYarlung
                  ZanboRiverBasinunderchangingenvironment,ERHIs(ThemostEcologicallyRelevantHydrologicIndicators)
                  andRVA(RangeofVariabilityApproach) methodswereadopted toquantitativelyanalyzethechangeof
                  hydrologicalregimeunderdifferentenvironmentalcomponentsatdifferentstagesduring1965 —2018,andfivemu
                  tationtestmethodswerecombinedtoverifytheindicators.Theresultsshowthatitisfeasibletointerpolatethedata
                  withEasyDHM model ,andtheNashcoefficientafterparameteroptimizationis0.97atthemaximum and0.67at
                  theminimum ,bothofwhicharewithinthereasonablerange.Accordingtothecalculationresultsofthechangede
                  greeofstrongvariationindexinthetwosections ,thehydrologicchangedegreesofthemiddleandlowerreachesof
                  theYarlungZangboRiverBasinarebothhighlychanged.Intermsofindexselection ,theIHA(Indicatorsof
                  HydrologicAlteration )indicesarehighlycorrelated,andtheredundancyproblemamongindicatorsisverypromi
                  nent.ERHIsindexhasacertaindegreeofreasonableness ,whichnotonlyeffectivelyreducestheredundancyprob
                  lemofIHA,butalsohelpstochoosethekeyecologicalandhydrologicalvariables.Ithasimportantreferencevalue
                  andsignificancefortheresearchonecologicalhydrology ,basinwaterresourcesmanagementandecologicalprotec
                  tion ,andprovidesreferencesforecologicalevaluationinareaslackinghydrologicaldata.
                  Keywords:hydrologicalchangedegree;hydrologicalregime;theYarlungZanboRiverBasin;themostecologi
                  callyrelevanthydrologicindicators ;EasyDHM model


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