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                  EvolutionlawofwatersurfaceareaintheBeijing - Tianjin - Hebeiplainfrom 1985to2020

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                                  1
                    WANGQingming,ZHANGYue,DOUPeng,ZHAOYong,LIEnchong,MAMengyang
                               (1.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China;
                  2.GeneralInstituteofWaterResourcesandHydropowerPlanningandDesign,MinistryofWaterResources,Beijing 100120,China;
                                    3.BeijingWaterScienceandTechnologyInstitute,Beijing 100048,China)
                  Abstract:Undertherequirementofthenationalrecoveryoftheecologicalenvironmentofriversandlakes,the
                  analysisofthehistoricallongseriesofwatersurfaceareachangesintheBeijing - Tianjin - HebeiPlainareaandthe
                  causesofchangesishelpfulforscientificformulationofregionalecologicalwaterrechargeandpredictionofwater
                  rechargeeffect.Inthisstudy ,thewaterareaoftheBeijing - Tianjin - Hebeiplainwasdeterminedbythreeperiods
                  oflandusedatafusion.ThewatersurfaceareaoftheBeijing - Tianjin - Hebeiplainfrom1985to2020wasextracted
                  basedonGEE(GoogleEarthEngine)cloudplatform,andthefillingrateofwaterareaandthereasonfortheevo
                  lutionofwatersurfaceareawereanalyzed.TheresultsshowthatthewatersurfaceareaoftheBeijing - Tianjin -
                  HebeiPlainhasbeenincreasingsince1985 ,andthefillingrateofthewaterareahasincreasedfrom1985to2020.
                  Ecologicalwaterrefillisthemainreasonfortheincreaseofthewatersurfaceareaoftheriverandlake.In2020,
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                  thewatersurfaceareaofthecentralplainhasincreasedby176km comparedwith2001.Thecontributionoflocal
                  andexternalecologicalwaterreplenishmentaccountedfor84%.Aimingattherecoveryofriversandlakes ,differ
                  entscenariosweresetupfromtheperspectiveofwaterareafillingrate ,andtheecologicalwaterrequirementsofriv
                  ersandlakesunderdifferentscenarioswereestimatedrespectively.Theresearchresultssystematicallyanalyzedthe
                  watersurfacestatusandtheeffectofecologicalwaterreplenishmentintheBeijing - Tianjin - HebeiPlain ,whichisof
                  greatsignificanceforcarryingoutreasonableriverandlakerecoverymeasuresintheBeijing - Tianjin - HebeiPlain.
                  Keywords:waterbodiesspace;watersurfacearea;GEEcloudplatform;fillingrate;ecologicalwaterdemand


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