Page 24 - 《水资源与水工程学报》2022年第3期
P. 24
!33 " ! 3 # & ' ( ) & * + , - Vol.33No.3
2022 $ 6 % JournalofWaterResources&WaterEngineering Jun.,2022
DOI:10.11705/j.issn.1672-643X.2022.03.03
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8IBJK:TV122. 3 LMNOP:A LQRK:1672643X(2022)03002007
NonstationarydesignfloodanalysisoftheQiujinHydrologicalStationin
theXiuheRiverBasin,PoyangLake
WUShaofei,LUOWen,XIONGFandi,OUYANGFen,HUANGBinbin
(National&ProvincialJointEngineeringLaboratoryfortheHydraulicEngineeringSafety&EfficientUtilizationofWater
ResourcesofPoyangLakeBasin ,NanchangInstituteofTechnology,Nanchang330099,China)
Abstract:Thedeterminationofthenonstationarydesignfloodisanintegralpartoftheplanningandde
signingofwaterconservancyprojects,aswellasthedecisionmakingoffloodcontrol.Aimingatthedis
advantagesoflimitedapplicationoftheannualnonstationaryvalueobtainedbytheconventionaltimevar
yingmomentmethod ,weemployedtheexpectednumberofexceedances(ENE)ofreturnperiodtoinves
tigatethenonstationarydesignfloodoftheQiujinHydrologicalStationintheXiuheRiverBasinwiththe
considerationofmeteorologicalfactorsofprecipitationandairtemperaturederivedfrom thedownscaled
generalcirculationmodel (GCM).Thefloodseriesofannualmaximum1day,annualmaximumconsec
utive3day,7day,15dayandannualmaximum1monthoftheQiujinHydrologicalStationfrom1956to
2014wereanalysedtoobtainthenonstationarydesignfloodofmultipletimescales ,whichwerethen
comparedwiththoseoftheconventionalmethod.Resultsshowedthatthelocationparameterofallthea
bovefiveseriessufferedfromsignificantnonstationarity;thedesignfloodvalueswereofgreatdifference
betweenthestationarymodelsandthenonstationarymodelswithprecipitationandtemperatureascovari
ates.Particularly ,atthereturnperiodsof20aand50aofeachtimescale,thenonstationarydesign
valuesreducedbyabout13.5% -32.6% (about26.4% average)and15.3% -39.1% (about31.
0% average )underthescenariosofRCP4.5andRCP8.5,comparedwiththestationaryones.Thisre
searchmayprovideacontributiontotheregionalflooddisasterpreventionandthereuseoffloodre
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