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1、WATERRESOURCESRESEARCH,VOL.38,NO.7,1125,10.1029/2000WR000182,2002Controlsofmassrecoveryratesinsingle-wellinjection-withdrawaltracertestswithasingle-porosity,heterogeneousconceptualizationSusanJ.AltmanandLucyC.MeigsGeohydrologyDepartment,SandiaNationalLabor
2、atories,Albuquerque,NewMexico,USA1ToyaL.JonesDukeEngineeringandServices,Inc.,Austin,Texas,USASeanA.McKennaGeohydrologyDepartment,SandiaNationalLaboratories,Albuquerque,NewMexico,USAReceived2January2001;revised14December2001;accepted31January2002;published3
3、0July2002.[1]Asingle-wellinjection-withdrawal(SWIW)testisevaluatedasatooltoassessasingle-porosityconceptualizationforatransportsystem.WehaveshownthattherearecasesinwhichmatrixdiffusioncannotbeprovendefinitivelyfromtheresultsofSWIWtestsowingtouncertaintieso
4、faquiferproperties.Driftduringtherestingphaseofthetestcancarryaplumetoareaswherethefluxislowerduringthewithdrawalphase,leadingtodecreasedmassrecoveryrates.Resultsofsensitivitystudiesonmultiple,stochasticallygenerated,heterogeneoustransmissivityfieldsindica
5、tethatvarianceintransmissivityhasastrongeffectondriftandconsequentlymassrecoveryrates.Inadditiontoimpactingdriftdirectly,theregionalgradienthasthepotentialtoinfluencemassrecoveryratesbyinterferingwiththepumping-inducedfluxestowardthewellduringwithdrawal.Th
6、eKolmogorov-Smirnovtestisusedtoevaluatewhethersimulateddatausingasingle-porosityconceptualizationwithplumedriftsignificantlydifferfromSWIWtracertestdatafromafractureddolomiteunitattheWasteIsolationPilotPlant.Giventheuncertaintyinthevarianceoftransmissivity
7、,itisunlikelythatasingle-porosityconceptualizationcanmatchthefielddata.Matrixdiffusionisalikelyexplanationfortheobservedgradualmassrecoveryrates.INDEXTERMS:1829Hydrology:Groundwaterhydrology;1832Hydrology:Groundwatertransport;KEYWORDS:single-welltracertest
8、,transportmodeling,geostatisticalsimulation,matrixdiffusion,solutetransport,dolomite1.Introduction[3]Becausepredictivemodelingforcontaminanttrans-portshouldnotoverpredictretardation(andthusunder-[2]Matrixdiff
