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MorphologicaleffectsoftheoperationofXiaolangdiReservoironthe
LowerYellowRiverinrecentyears
1,2
1,2
1,2
1,2
1,2
WANGYuanjian ,WANGQiang ,LIUYanhui ,LIUGang ,JIANGEnhui
(1.KeyLaboratoryofYellowRiverSedimentoftheMinistryofWaterResources,YellowRiverInstituteof
HydraulicResearch ,Zhengzhou 450003,China;
2.HenanProvincialEngineeringResearchCenterofReservoir - LakeFunctionRestoringandMaintaining,Zhengzhou 450003,China)
Abstract:SinceitsoperationinOctober1999,theXiaolangdiReservoirhasprofoundlychangedtheprocessof
runoffandsedimententeringthelowerreachesoftheYellowRiverfor23years,leadingtothereconstructionofthe
riverbedinthelowerreaches.Thisstudyisbasedonmulti - sourcedatasuchaslong - term hydrologicalandsedi
ment,cross - sectionaltopography,andremotesensingimagesfrom1960to2022.Itelucidatestheimpactofthe
XiaolangdiReservoironthedownstreamriverchannelsinceitsoperationfromthreeaspects:runoffandsediment,
erosionandsedimentationevolution,andmorphologicaladjustment.Theresultsshowthat:(1)Thesedimentre
tentioneffectofthereservoirissignificant,withamoreuniformdistributionofdischargedwaterwithintheyearand
amoreconcentratedsedimentamounttowardsthefloodseason ; theseverityandfrequencyofextremefloods,
droughts,andhyperconcentrationeventshavesignificantlydecreased;theadjustmentofsuspendedsedimentisnot
significant ,andthecoarseningofbedsedimentissignificant.(2)Thetrendofcontinuoussedimentationinthe
lowerYellowRiverhasbeenreversed ,andtheadjustmentoferosionandsedimentationmainlyoccursinthewan
deringriversectionfromHuayuankoutoGaocun ;theerosionefficiencycontinuestodecrease,andtheflowcapaci
tyofthemainchannelhasbeensignificantlyrestored.(3)Thecross - sectionalmorphologyofthewanderingriver
sectionhasdevelopedtowardsnarrowanddeepdepths ,andthedevelopmentofsecondarysuspendedrivershas
beeneffectivelyalleviated.Theoverallriverregimeoftheriversectionisinastablestate.Theresearchresults
haveenrichedthescientificunderstandingoftheimpactofreservoirconstructionondownstreamriversinsandyriv
ers,andcanalsoprovidescientificsupportfortheoptimaloperationoftheXiaolangdiReservoir.
Keywords:runoffandsediment;evolutionoferosionanddeposition;morphologicalcharacteristics;wandering
riversections;lowerreachesoftheYellowRiver
(责任编辑:李福田)
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