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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                        Responseofrunofftometeorologicalandlargescaleclimatic

                                       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)andElNio-southernoscillation(ENSO).Theresultsrevealthattherunoffinthis
                 basinexhibitsaninsignificantupwardtrend,likelyduetotheinteractionsbetweenthenonsignificantin
                 creaseinprecipitationandothermeteorologicalfactors.Precipitationemergesasthedominantfactorin
                 fluencingrunoff ,withanexplanatorypowerofupto0.827ontheannualscale.Theinteractionofmulti
                 plefactorsprovidesamoresignificantexplanatorypowerthanthesimplesumofanytwoindividualfac
                 tors.Theinfluenceof AMOonrunoffismainlyobservedinthe4yearcycle,whileENSOshowsabetter
                 correspondencewithapproximate2yearcycles.

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