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:1672643X(2025)01006314
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
concentrationperiodofmultiyearrunoffoccursinJuly ,showingatrendofearlieroccurrencealongside
6
3
anaveragedeclinerateof59.7×10 m /10ainmultiyearrunoff.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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