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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
(责任编辑:耿庆斋)
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