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                        EvolutionlawanddrivingfactorsofthreeoutletsalongJingjiangRiverafter
                                           operationofThreeGorgesReservoir

                                    ZHAOWei,MAOJixin,GUANJianzhao,WANGDayu
                            (ChinaInstituteofWaterResourcesandHydropowerResearch,StateKeyLaboratoryofSimulationand
                                         RegulationofWaterCycleinRiverBasin,Beijing 100048)

                  Abstract:ThethreeoutletsalongJingjiangriverarethecoreofthechangeofriver - lakerelationship,andthe
                  changeofdiversionlawwillaffecttheriver - lakerelationshipinthedownstream oftheThreeGorgesDam.There
                  fore ,itisnecessarytoquantitativelystudythechanginglawanddrivingfactorsofthethreeoutletsalongJingjiang
                  river.Basedonthemeasureddatafrom 1991to2020,throughregressionanalysisandartificialneuralnetwork
                  (ANN)modelbasedonTensorflow,thispaperexplorestheinfluenceofdrivingfactorssuchastheregulationand
                  storageoftheThreeGorgesReservoirandtheupstreamreservoirgroup ,andthemismatchscourbetweenthethree
                  channelsofJingnanoutletsandthemainstreamonthevariationlawofthethreeoutlets.Theresultsshowthatbe
                  foreandaftertheimpoundmentoftheThreeGorgesReservoirin2003 ,thediversionvolumeofthethreeoutletsa
                  longJingjiangriverhaschangedgreatly ,andtheaverageannualdischargefrom2003to2020isreducedbyabout
                                                                              3
                  20% comparedwiththatfrom1991to2002 ,withadifferenceof12.44billionm .Furtherexplorethedrivingfac
                  torsoftheevolutionofthethreeoutletsdiversionsalongJingjiangriver ,theinfluenceofmismatchscourbetween
                                                                                                 3
                  thethreechannelsofJingnanoutletsandthemainstreamisthemainfactor ,whichisabout7.57billionm ?a;The
                                                                                   3
                  secondistheinfluenceoftheThreeGorgesReservoirregulation ,about2.86billionm ?a;theinfluenceofrunoff
                  changeandstorageofcascadereservoirsintheupperreachesoftheThreeGorgesonthediversionofthethreeout
                                      3
                  letsisabout2.01billionm ?a.AftertheimpoundmentoftheThreeGorgesReservoirin2003,theregulatingrunoff
                  andunequalerosionofthereservoirdominatedthedrivingfactorsofthediversioncapacityofthethreeoutlets.The
                  jointoperationoftheThreeGorgesReservoiranditsupstreamcascadereservoirsshouldbecontinuouslyoptimized ,
                  andmeasuressuchasdredgingandexcavationshouldbetakentoincreasethediversioncapacityofthethreeoutlets
                  tomaintaintherelationshipbetweenriversandlakes.
                  Keywords:thethreeoutletsalongJingjiangRiver;flowdiversion;artificialneuralnetwork;Tensorflow
                                                                                    (责任编辑:韩 昆)

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