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Analysisontheevolutionanddrivingmechanism oflowflow
regimefrom 1956to2022inPoyangLake ,China
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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
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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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