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                            Inversionofheterogeneousparameterfieldandextractionamountof
                           groundwaternumericalmodelbasedonMCMCandES - MDAmethods

                        LIUYongda,CHENXi,GAOMan,MENGXiangbo,LIUWeihan,HUANGRichao
                     (InstituteofSurface - EarthSystemScience,SchoolofEarthSystemScience,TianjinUniversity,Tianjin 300072,China)

                  Abstract:MarkovchainMonteCarlo(MCMC)methodandEnsembleSmootherMultipleDataAssimilation(ES -
                  MDA )methodshavebeenwidelyusedingroundwaterparameterinversioninrecentyears,buttheaccuracyandcom
                  putationalefficiencyofthree - dimensionalmulti - layerheterogeneousaquiferparameterinversionarestilllackingcom
                  parativeanalysis.Tothisend ,weconstructacasestudyofunderwaterandmultilayerconfinedwateraquiferswith
                  heterogeneousparameterfieldsbasedonKarhunen - Loeveexpansion,andestablishanumericalgroundwatermodel
                  andanalternativemodelbasedonKrigingmethodtosimulatethevariationofwaterheadinlayersofaquifers.The
                  permeabilitycoefficientandrecoveryofaquiferobtainedfrom theMCMCbasedonthealternativemodel,thetwo -
                  stageMCMCbasedonthecombinationofthealternativemodelandthenumericalmodel,andtheES - MDAmethod
                  arediscussed.Theresultsshowthatthetwo - stageMCMCinversionparameterhasthehighestaccuracyandtheES -
                  MDAmethodhasthehighestcomputationalefficiencyintheinversionofheterogeneousparametersandminingquanti
                  ty.Thisstudyprovidesreferencefortheselectionofparameterinversionmethodofgroundwaternumericalmodel.
                  Keywords:MCMCalgorithm;ES - MDAalgorithm;Surrogatemodel;groundwaterparameters;numericalsimu
                  lationofgroundwater

                                                                                    (责任编辑:耿庆斋)

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