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                                Analysisontheevolutionanddrivingmechanism oflowflow
                                     regimefrom 1956to2022inPoyangLake ,China

                                                                                          4
                                                                          3
                            1,2
                                                                                                      5
                                              1
                                                            2
                  XIONGBin ,ZHUOYunqiang,XUChongyu,XIONGLihua,CHENZeqiang,TIANYifei
                               (1.SchoolofInfrastructureEngineering,NanchangUniversity,Nanchang 33003,China;
                                    2.DepartmentofGeosciences,UniversityofOslo,Oslo N - 0316,Norway;
                      3.StateKeyLaboratoryofWaterResourcesEngineeringandManagement,WuhanUniversity,Wuhan 430072,China;
                  4.NationalEngineeringResearchCenterofGeographicInformationSystem,ChinaUniversityofGeosciences,Wuhan 430074,China;
                              5.BureauofHydrology,ChangJiangWaterResourcesCommission,Wuhan 430010,China)
                  Abstract:ChangesinthelowflowregimeofPoyangLakewillgreatlyaffectthesecurityandstabilityofregional
                  waterresources,waterenvironmentandwaterecology.Theanalysisofthecausesofextremehydrologicaleventsin
                  PoyangLakeandtheearlywarningofdisastersundercomplexconditionsarecurrentlydifficultproblemsthatneed
                  tobebrokenthrough.Thispaper ,basedontheanalysisofthehydrologicalprocessofannualwaterreplenishment
                  andwaterwithdrawalinthelakearea,explorestheevolutionlawanddrivingmechanismofthelowflowregimein
                  thelakeareabyusingthemethodssuchasthestaginganalysisof “river - lakerelationship”.Theresultsshowthat:
                  ( 1)duringthepost - ThreeGorgesperiod,thedryregimeinthelakeareawassignificantlyintensified,theannual
                  minimum waterlevelatXingzistationdroppedby5.7% onaverage ,andthelowwaterintensityandlowwaterdays
                  increasedby36.9% and26.6% onaverage ,respectively;(2)inthesinglefactoranalysis,thenumberoflow -
                  waterdaysinthelakeareaismoreaffectedbytheflowconditionsoftheYangtzeRiverthanthelow - waterintensity
                  andminimumwaterlevel ;inthemulti - factoranalysis,sixexplanatoryfactorscomprehensivelyexplainedtheevo
                                                                               2
                  lutionofthethreeabove - mentionedlowflowvariablesinthelakearea ,andtheR valuesobtainedbythethreere
                  gressionmodelswere0.83 ,0.83,and0.70,respectively;(3)contributionanalysisshowsthattheoverallaggra
                  vationofthedryinthepast20yearsismainlyduetothecomprehensiveimpactofchangesintheYangtzeRiverwa
                  terflowconditions ;takingthedecreaseintheannualminimumwaterlevelinthelakeareaasanexample,thevar
                  iationinthewaterlevelandflowrelationshipofriversandlakescontributes138.0%,Hankourunoffreductioncon
                  tributes8.4%,andHankourunoffincrease(mitigation)duringthereplenishmentperiodoftheThreeGorgesReser
                  voircontributes - 34.2%.Thisstudywillprovideareferenceforthedecouplingofthedrivingmechanismofthelow
                  flowregimeinPoyangLakeandthestudyofdroughtearlywarning.
                  Keywords:PoyangLake;lowflow;drought;ThreeGorgesReservoir;contributionanalysis

                                                                                    (责任编辑:耿庆斋)

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