Page 94 - 《水资源与水工程学报》2024年第5期
P. 94

!35 "!5 #                         & ' ( ) & * + , -                               Vol.35No.5
               2024 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2024

            DOI:10.11705/j.issn.1672-643X.2024.05.11


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                 JKL: 5Aϱ;GoogleEarthEngine; A¿gû; =j¢A; Æ5iÏ
                 MNFOP:P333;TV213.4   QRSTU:A    QVWP:1672643X(2024)05009010
                    Spatialandtemporalevolutionofriveroverflowanditsinfluencing
                     factorsofthelowerreachesoftheHeiheRiverinGansuProvince

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                 CHENJunpeng,YUTengfei ,WANGZhijun,YINYidan,CHENXiaoling,WANGYu                        1
                (1.CollegeofEnergyandPowerEngineering,LanzhouUniversityofTechnology,Lanzhou730050,China;2.KeyLaboratory
                  ofEcologicalSafetyandSustainableDevelopmentinAridLands,NorthwestInstituteofEcoenvironmentandResources,
                  ChineseAcademyofSciences,Lanzhou730000,China;3.AlaxDesertEcohydrologicalExperimentalResearchStation,
                     NorthwestInstituteofEcoenvironmentandResources,ChineseAcademyofSciences,Lanzhou730000,China;
                                  4.ForestryandGrasslandBureauofEjinaBanner,Alax737300,China)
                 Abstract:Ecologicalwaterdiversion(EWD)isaprimarymeasureforrehabilitatingdegradedecosystems
                 ininlandriverbasinsofaridregions;andtheriverwateroverflowinducedbyEWDprojectdirectlyim
                 pactstheefficacyofoasisvegetationrestoration.IntegratingtheGlobalSurfaceWaterDatasetspanning
                 from1987to2021aswellasnaturalenvironmentandhumanactivitydatawithinthebasin,thisstudy
                 delvesintothespatialandtemporalshiftsintheriveroverflowprocessanditsinfluencingfactorsbefore
                 andafterEWDinthelowerreachesoftheHeiheRiver.Thisisachievedbytheconstructionofwater
                 bodyfrequencybasedonGoogleEarthEngineplatform ,whichdenotestheratioofobservedinstancesofa
                 particularpixeltothetotalobservedinstanceswithinaspecifictime.Thefindingsrevealedthatbeforethe
                 diversion ,themeanannualrunoffatZhengyixia,ShaomayingandLangxinshanstationstoodat886×
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