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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

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