Page 95 - 《水资源与水工程学报》2022年第4期
P. 95
!33 " ! 4 # & ' ( ) & * + , - Vol.33No.4
2022 $ 8 % JournalofWaterResources&WaterEngineering Aug.,2022
DOI:10.11705/j.issn.1672-643X.2022.04.13
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FGHIJ:TV122 .3 KLMNO:A KPQJ:1672643X(2022)04009106
Nonstationaryfloodfrequencyanalysisoftheupperreachesof
MekongRiverbasedontimevaryingmomentmodel
2
3
1
1
LONGYunshu,YEChangqing,LIYungang,XIONGHeyong,ZHAOChengyuan 3
(1.YunnanKeyLaboratoryofInternationalRiversandTransboundaryEcosecurity,YunnanUniversity,Kunming650504,China;
2.CollegeofEcologyandEnvironment,HainanUniversity,Haikou570228,China;
3.HuanengLancangRiverHydropowerInc.,Kunming650214,China)
Abstract:Thisstudypresentedaframeworktoselectasuitabletimevaryingmoment(TVM)modelfor
nonstationaryfloodfrequencyanalysisbasedonthedailyflowobservationdataatChiangSaenStation ,
MekongRiverfrom1960to2019,theimpactsofcascadereservoirconstructiononthefloodfrequency
werefurtherexplored.TheresultsshowedthattheannualmaximumdailyflowseriesofChiangSaenSta
tionexhibitedasignificantdecreasingtrend (p<0.01);thecombinationofgeneralizedlogisticdistribu
tion(GLO)andtheALlineartrendmodelcouldobtaintheoptimalfitting;comparedwiththeconven
tionalfrequencyanalysis ,thedesignflowof100aobtainedbytheTVMmodeldecreasedwithtime,but
thereturnperiodshowedanupwardtrend.Theupstream cascadereservoirshadanobviousregulation
effectonthepeakflowof100afloodatChiangSaenStationespeciallyaftertheoperationofNuozhadu
Reservoir ,whichhadapositiveeffectonthedownstreamfloodcontrol.
Keywords:hydrologicalfrequencyanalysis;nonstationary;timevaryingmomentmodel;probability
distributionfunction;theupperreachesofMekongRiver
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