Page 95 - 《水资源与水工程学报》2024年第5期
P. 95

! 5#            ÜÝÞ, :: ßàáâhŒŸh&ãäåæçFJwKLMN                                                9 1

                  3
                 m afterthediversion;themeanannualrunoffofLangxinshantoEastJuyanLakesectionamountedto617
                     6
                       3
                 ×10 m(representingtheavailablewaterresourcesintheoasis),whichconcentratedmainlyinperiods
                 ofApril-MayandSeptember-October.Spatially,theareaofpermanentwaterbodiesprogressivelyin
                 creasedafterthediversion ,andpredominantlyclusteredaroundtheEastJuyanLake.In2004,aperma
                 nentwaterbodyappearedinEastJuyanLake,whileWestJuyanLakedidnotseetheemergenceofper
                 manentwaterbodies.ThehighestwaterbodyfrequencywasobservedinthevicinityoftheShaomaying-
                 Langxinshansection ,followedbyEastJuyanLakeanditsperiphery,whiletheEastRiver,WestRiver,
                 andWestJuyanLakeexhibitedlowerlevels.BeforeEWD,riveroverflowwasprimarilyanaturalprocess
                 heavilyinfluencedbyhumanactivitiesinthemiddlereaches;however,itshowedasignificantpositive
                 correlationwithecologicalwatervolumes(P<0.01)afterEWD.Inaddition,downstreamannualevapo
                 rationandhumanactivitieswerebothsignificantlyandnegativelycorrelatedwithriveroverflowprocesses
                 (P<0.01).Itisrecommendedtoconstructandrehabilitateecologicalhydraulicengineeringprojectsin
                 thelowerreachesoftheHeiheRivertoimprovespatialandtemporalimbalanceofriveroverflow,and
                 thenensurethehealthandsafetyofdownstreamecosystems.
                 Keywords:riveroverflow;GoogleEarthEngine;waterbodyfrequency;ecologicalwaterdiversion
                 (EWD);thelowerreachesoftheHeiheRiver

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