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:1672643X(2022)04009106
                      Nonstationaryfloodfrequencyanalysisoftheupperreachesof

                             MekongRiverbasedontimevaryingmomentmodel

                                                  2
                                                                                3
                                                               1
                                  1
                     LONGYunshu,YEChangqing,LIYungang,XIONGHeyong,ZHAOChengyuan                     3
              (1.YunnanKeyLaboratoryofInternationalRiversandTransboundaryEcosecurity,YunnanUniversity,Kunming650504,China;
                              2.CollegeofEcologyandEnvironment,HainanUniversity,Haikou570228,China;
                                   3.HuanengLancangRiverHydropowerInc.,Kunming650214,China)
                 Abstract:Thisstudypresentedaframeworktoselectasuitabletimevaryingmoment(TVM)modelfor
                 nonstationaryfloodfrequencyanalysisbasedonthedailyflowobservationdataatChiangSaenStation ,
                 MekongRiverfrom1960to2019,theimpactsofcascadereservoirconstructiononthefloodfrequency
                 werefurtherexplored.TheresultsshowedthattheannualmaximumdailyflowseriesofChiangSaenSta
                 tionexhibitedasignificantdecreasingtrend (p<0.01);thecombinationofgeneralizedlogisticdistribu
                 tion(GLO)andtheALlineartrendmodelcouldobtaintheoptimalfitting;comparedwiththeconven
                 tionalfrequencyanalysis ,thedesignflowof100aobtainedbytheTVMmodeldecreasedwithtime,but
                 thereturnperiodshowedanupwardtrend.Theupstream cascadereservoirshadanobviousregulation
                 effectonthepeakflowof100afloodatChiangSaenStationespeciallyaftertheoperationofNuozhadu
                 Reservoir ,whichhadapositiveeffectonthedownstreamfloodcontrol.
                 Keywords:hydrologicalfrequencyanalysis;nonstationary;timevaryingmomentmodel;probability
                 distributionfunction;theupperreachesofMekongRiver

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