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                          Constructionofnon - stationaryhydrologicaldroughtassessmentmethods
                                     basedontime - varyingparametersandthresholds



                                                                                          3
                                                                           1,3
                                            1
                              WANGMenghao,JIANGShanhu      1,2,3 ,RENLiliang ,YANGXiaoli,
                                                           3
                                                                         2
                                               FANGXiuqin,YANDenghua
                          (1.TheNationalKeyLaboratoryofWaterDisasterPrevention,HohaiUniversity,Nanjing 210098,China;
                            2.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteof
                                       WaterResourcesandHydropowerResearch ,Beijing100038,China;
                               3.CollegeofHydrologyandWaterResources,HohaiUniversity,Nanjing 210098,China)

                  Abstract:Inachangingenvironment,thejointimpactsofclimatechangeandhumanactivitiesleadtonon - sta
                  tionarycharacteristicsofstreamflowprocesses ,whichurgentlyrequirethedevelopmentofnon - stationaryhydrologi
                  caldroughtassessmentmethods.TheWeiheRiverbasininChinawasselectedasthestudyarea ,andthenon - sta
                  tionarycharacteristicsofitsstreamflowprocesseswereanalyzedbasedonthestationaritytest ,change - pointtest,
                  andtrendanalysismethods.Thegeneralizedadditivemodelforlocation,scale,andshape(GAMLSS)modeland
                  thecompleteensembleempiricalmodedecompositionwithadaptivenoise (CEEMDAN)methodwereusedtocon
                  structthetime - varyingStandardizedStreamflowIndex (SSI )andthetime - varyingThresholdLevelseries(TL var )
                                                              var
                  consideringthenon - stationarycharacteristicsofthestreamflowtocarryoutthenon - stationaryhydrologicaldrought
                  assessment.Then,standardizedprecipitationindex(SPI)andhistoricalrecordsofdroughteventswereselectedto
                  validatetherationalityofthetwoproposednon - stationaryassessmentmethods.Theresultsshowedthatthetimeof
                  thechangepointfortheannualstreamflowseriesintheWeiheRiverbasinwasconcentratedaroundtheyear1990.
                  Thestreamflowserieshadasignificant( α <0.05)upwardtrendduringtheperiodafterthechangepoint(from1991to
                  2020 ).ComparisonresultsbetweendifferentdesignschemesshowedthattheSSI andTL var weremorerobustthan
                                                                              var
                  thetraditionalstandardizedstreamflowindexorthresholdlevelmethods ,andcanreasonablycapturethedrought
                  andflooddynamicsofthestreamflowprocess.Thevalidationresultsshowedthatdroughtandfloodprocesseschar
                  acterizedbytheproposedtwonon - stationaryassessmentmethodswereinhighagreementwiththosecharacterized
                  bytheSPIseriesandhistoricalrecordsofdroughtevents ,revealingthatthesetwonon - stationarymethodsaremore
                  suitableforthenon - stationaryhydrologicaldroughtassessmentinachangingenvironment.
                  Keywords:changingenvironment;hydrologicaldrought;time - varyingstandardizedstreamflowindex;time - var
                  yingthresholdlevelmethod ;WeiheRiverbasin


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