Page 57 - 《水资源与水工程学报》2024年第5期
P. 57
!35 "!5 # & ' ( ) & * + , - Vol.35No.5
2024 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2024
DOI:10.11705/j.issn.1672-643X.2024.05.07
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MNFOP:TV121;P426.61 QRSTU:A QVWP:1672643X(2024)05005309
Responseofrunofftometeorologicalandlargescaleclimatic
factorsintheGanjiangRiverBasin
1,2
1
DINGYinglong ,WANGHong
(1.KeyLaboratoryofWaterCycleandRelatedLandSurfaceProcesses,InstituteofGeographicSciencesand
NaturalResourcesResearch,ChineseAcademyofSciences,Beijing100101,China;2.CollegeofResources
andEnvironment,UniversityofChineseAcademyofSciences,Beijing100049,China)
Abstract:Undertheimpactofglobalclimatechange,theongoingalterationsinmeteorologicalandlarge
scaleclimaticfactorswhichdrivehydrologicalprocessespresentsignificantchallengestowaterresources
managementandallocation.AsthelargestwatershedofPoyangLake,theGanjiangRiverBasinplaysa
crucialroleinthefrequentoccurrencesofdroughtsandfloodsinPoyangLakeinrecentyears.Thisstudy
analyzestherunofftrendsintheGanjiangRiverBasinusingdailymeteorologicaldataanddailyrunoffda
tafromtheWaizhouHydrologicalStationlocatedatthebasin ’soutlet,coveringtheperiodfrom1966to
2020.EmployingtheMann-Kendalltrendtest,Geodetector,andwaveletanalysis,weinvestigatethe
trendsinrunoff,theexplanatorypowerofmeteorologicalfactorsonrunoff,andthevariabilityandtele
connectionsbetweenthemonthlyaverageflowoftheGanjiangRiverBasin,theAtlanticmultidecadalos
cillation(AMO)andElNio-southernoscillation(ENSO).Theresultsrevealthattherunoffinthis
basinexhibitsaninsignificantupwardtrend,likelyduetotheinteractionsbetweenthenonsignificantin
creaseinprecipitationandothermeteorologicalfactors.Precipitationemergesasthedominantfactorin
fluencingrunoff ,withanexplanatorypowerofupto0.827ontheannualscale.Theinteractionofmulti
plefactorsprovidesamoresignificantexplanatorypowerthanthesimplesumofanytwoindividualfac
tors.Theinfluenceof AMOonrunoffismainlyobservedinthe4yearcycle,whileENSOshowsabetter
correspondencewithapproximate2yearcycles.
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