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Researchondesignfloodestimationmethodduringoperationperiodfor
cascadereservoirsinthelowerJinshaRiver
XIEYuzuo,GUOShenglian,ZHONGSirui,WANGXiaoya,WANGJun
(StateKeyLaboratoryofWaterResourcesEngineeringandManagement,WuhanUniversity,Wuhan 430072,China)
Abstract:ThecascadereservoirsinthelowerJinshaRiverwereselectedascasestudy.Boththetime - varyingP -
Ⅲ curvefitting(Tv - P3?CF)methodandthemostlikelyfloodregionalcomposition(MLFRC)methodwereem
ployedtoestimatethedesignfloodduringthereservoiroperationperiod ,consideringtheregulationeffectsofup
streamreservoirsinimplicitandexplicitway,respectively.Thedesignfloodhydrographswereamplifiedbythe
samefrequencymethod,andthereservoirfloodcontrolwaterlevels(FCWLs)weredetermined.Theresultsindi
catethat:(1)Thedesignfloodsduringoperationperiodcalculatedbytwomethodsareconsistentlylowerthan
thoseduringtheconstructionperiod.TheTv - P3?CFmethodofferscovariatewithouttheneedtoconsiderthereser
voiroperationandrestoreflowdataseries ,whiletheMLFRCmethod,whichperformsstep - by - stepfloodrouting
from upstreamtodownstreamforeachreservoir ,ismuchcomplexinitscalculationprocessbutholdspracticalsig
nificance.(2)Theregulationeffectofupperreservoirssignificantlyreducesdownstream floods,1,000 - year
designfloodpeak,3 - day,7 - day,and15 - dayfloodvolumesestimatedbytheTv - P3?CF(MLFRC)method
havereducedabout37.30%(41.65%),35.96%(39.66%),36.82%(35.72%),and28.03%(26.76%)atthe
XiangjiabaReservoir , respectively.(3) Maintainingtheoriginalfloodpreventionstandardsunchanged, the
FCWLsderivedbyfloodregulatingfortheWudongde - Baihetan - Xiluodu - Xiangjiabacascadereservoirsare955.6 、
794.6、572.3and373.2m,respectively.Comparedtoreservoiroperationbasedontheflood - limitedwaterlevels,
theoperationofcascadereservoirsbasedonFCWLscangenerate2.76billionkW·hmorepower( + 2.6%)from
JunetoSeptemberannually,whichhassignificanteconomicbenefits.
Keywords:reservoiroperationperiod;designflood;floodregionalcomposition;non - stationaryfloodfrequencya
nalysis ;flood - limitedwaterlevel;floodcontrolwaterlevel;lowerJinshaRiver
(责任编辑:韩 昆)
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