Page 67 - 《水资源与水工程学报》2025年第1期
P. 67

!36 "!1 #                         & ' ( ) & * + , -                               Vol.36No.1
               2025 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2025

            DOI:10.11705/j.issn.1672-643X.2025.01.08


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                 BC<DE:P333.1   FGHIJ:A    FKLE:1672643X(2025)01006314
                   RunoffevolutionintheXihanRiverBasinanditsattributionanalysis

             GAOGuoyan,SUNDongyuan,CUIYanqiang,WANGXingfan,WULanzhen,MAYali,SHUHeping
                  (CollegeofWaterConservancyandHydropowerEngineering,GansuAgriculturalUniversity,Lanzhou730070,China)

                 Abstract:Thestudyofrunoffevolutioncharacteristicsandtheirattributionanalysisiscrucialforpromo
                 tingtheefficientuseofregionalwaterresources.ThisstudyutilizesmonthlyrunoffdataoftheXihanRiv
                 erBasinfrom1960to2022 ,andvarioushydrologicalstatisticalmethodsfortheanalysis.Thesemethods
                 includetheGinicoefficient ,Lorenzasymmetrycoefficient,innovativetrendapproach(ITA),andPettitt
                 testmethod.Theanalysisfocusesonannualdistributioncharacteristics,interannualtrends,abruptchan
                 ges ,persistence,periodicity,andthecontributionratesofclimatechangeandhumanactivitiestorunoff
                 variations.TheresultsindicatethatrunoffdistributionwithintheyearintheXihanRiverBasinisune
                 ven ,withapproximately2/3ofannualrunoffoccurringduringthefloodseason.Inaddition,theaverage
                 concentrationperiodofmultiyearrunoffoccursinJuly ,showingatrendofearlieroccurrencealongside
                                               6
                                                  3
                 anaveragedeclinerateof59.7×10 m /10ainmultiyearrunoff.Basedonpersistenceanalysisresults,
                 runoffisexpectedtocontinuethedecliningtrendinthecomingyears.Itispresumedthattheprimaryab
                 ruptchangepointinrunofflikelyoccurredin1993,showingadistinctalternatingcycleoffloodand
                 drought.Thedominantperiodicityofrunoffintheupstream,downstream,andtributariesisconsistent,
                 rangingfrom41to47a,whilethemidstreamshowsaperiodicityof28a.Accordingtothecumulative
                 slopevariationrateanddoublecumulativecurvemethod,thecontributionrateofclimatechangetorunoff
                 reductioninthebasinare12.68% and19.75%;whilethatofhumanactivitiestorunoffreductionare
                87.32% and80.25%,respectively.Therefore,theprimaryfactorinfluencingtheannualdecreasein

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