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Complementaryandequivalentrelationshipbetweenthereservoirfloodpreventionstorages
ofcascadereservoirsintheDownstream JinshaRiverandThreeGorges
1
2
3
1
1,2
XIEYuzuo,XIONGFeng,GUOShenglian,WANGJun ,LIShuai,HUTing 3
(1.StateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience,WuhanUniversity,Wuhan 430072,China;
2.BureauofHydrology,ChangjiangWaterResourcesCommission,Wuhan 430010,China;
3.OperationandAdministrationCenterforRiverBasinHydroComplex,ChinaThreeGorgesCorporation,Yichang 443133,China)
Abstract:ThecascadereservoirsinthedownstreamJinshaRiverandtheThreeGorgesReservoir(TGR)arere
sponsibleforthetaskoffloodcontrolinthemiddleandlowerreachesoftheYangtzeRiver ,andtheirfloodpreven
tionstoragesintheupperYangtzeRiveriscomplementaryandequivalenttosomeextent.Thetypicalyearandmost
likelyregionalcompositionmethodswereadoptedinthispapertoanalyzethefloodregionalcompositionofTGR.
Basedontheprincipleofmaintainingtheoriginalfloodpreventionstandards ,thecomplementaryandequivalentre
lationshipbetweenthefloodpreventionstoragesintheupperYangtzeRiverwerederivedbyconsideringtheimpact
offivetypicalyearfloodhydrographsandthreedesignfloodfrequencies,andthecoefficientswerequantified.The
resultsrevealthat :(1)thefivetypicalyearscanrepresentfloodregionalcompositionofTGR,andthefloodpre
ventionstoragecomplementaryandequivalentrelationshipofcascadereservoirsandTGRisapproximatelylinearre
lationship.(2)Thecomplementaryandequivalentcoefficientsofthecascadereservoirsunderthesametypicalyear
anddesignfrequencyarealmostthesame.WhenthepredictedfloodmainlyoriginatesfromtheJinshaRiver (inter
valsection ),thecoefficientistakenas0.8(0.5).(3)BydynamicallyadjustingthefloodcontrolcapacityofTGR
throughfloodforecastingandthederivedrelationships ,TGRcanincreaseatleast4.14billionkW·h( + 9.86%)
hydropowergenerationduringthefloodseasononaveragewithoutincreasingfloodcontrolrisks.
Keywords:cascadereservoirs;floodpreventionstorage;floodregionalcomposition;complementaryandequiva
lentrelationship;downstreamJinshaRiver;ThreeGorgesReservoir
(责任编辑:耿庆斋)
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