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                      RelationshipbetweensedimenttransportcapacityofthePoyangLakechanneland
                                          sedimentoutofthelakeandadjustment

                                       FANGChunming,GUANJianzhao,SHIHongling
                                (ChinaInstituteofWaterResourcesandHydropowerResearch,Bejing 100048,China)

                  Abstract:PoyangLakeisanimportantpartoftheecosystemoftheYangtzeRiverBasin.Inrecentyears,thelow
                  waterlevelofPoyangLakeanditslowwatertimehaveshownregularandtrendchanges,whichhavecausedexten
                  siveresearch.AsalinkbetweentheYangtzeRiverandthelake,thePoyangLakechannelplaysanimportantrole
                  intheevolutionoftheriver - lakerelationship.Especiallysince2001 , therehasbeenadistinctandcomplex
                  processofchangesandthereasonsforthisareobviouslycontroversial.Basedonhydrologicalandsedimentobserva
                  tionsandmechanismstudies ,therelationshipbetweenthesedimentchangesflowintoandoutofPoyangLakeand
                  thesedimentcarryingcapacityofthechannelwasanalyzed.Researchindicates:Themonthlyflowvelocityofthe
                  representativesectionofthechannelisproportionaltothemonthlysedimentconcentrationoutofthelake.Thesedi
                  mentvolumeoutofthelakeisdirectlyrelatedtothesedimenttransportcapacityofthechannel.Theeffectofthe
                  inflowsedimentontheevolutionofthechannelwasslow.FromApriltoJune ,whentheinflowsedimentwascon
                  centrated ,thereductionamountandratiooftheoutflowsedimentweresmallerthanthereductionamountandratio
                  oftheinflowsediment,andwerelargerthanthereductionratioofthesedimenttransportcapacityineachmonth
                  around1985.Comparedwith1955 - 1998 ,thechangeratioofmonthlysedimentconcentrationoutofthelakehada
                  goodrelationshipwiththechangeratioofthemonthlysediment - carryingcapacityofthechannel.Fromtherelation
                  shipbetweenthesedimentconcentrationoutofthelakeandthevelocityoftherepresentativesection ,thesediment
                  concentrationfrom1999to2010wasgenerallylowerthanthecorrelationlinefrom1955to1998withoutconsidering
                  thechangeofthesection ,andwashigherthanthecorrelationlinefrom1955to1998afterconsideringtheexpan
                  sionofthesection.Theresultsindicatethattheincreaseofsedimentconcentrationandtheexpansionofchannel
                  sectionfrom1999to2010aretheresultoferosionandsandmining.Duetotheexpansionofthecross - section ,the
                  sedimentcarryingcapacityhadreduced ,thesedimentconcentrationoftherepresentativesectionofthelowerreach
                  channelfrom2011to2020wasbasicallyconsistentwiththerelationshiplineof1955to1998atthesamevelocity ,
                  whiletherelationshiplineoftheupperrepresentativesectionwassignificantlylowerthanthatof1955to1998.This
                  indicatesthatthelowersectionofthechannelhastendedtobestableandtheuppersectionwillstillhaveacertain
                  scouringadjustment,andthelakedrywaterlevelmaycontinuetodecline.Theresultsofthisstudyareofgreatsig
                  nificanceforclarifyingthescouringandsedimentationofthechannel ,theinteractionbetweentheYangtzeRiver
                  andthePoyangLake,andforguidingtheprotectionandmanagementofthelake.
                  Keywords:thechannelofthePoyangLakelinkingtotheYangtzeRiver;sedimentvolumeintothelake;sedi
                  ment - carryingcapacity;sedimentvolumeoutofthelake;sedimenterosionanddeposition


                                                                                    (责任编辑:李福田)










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