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1、GEOPHYSICALRESEARCHLETTERS,VOL.36,L11403,doi:10.1029/2008GL036906,2009ClickHereforFullArticleNaturalfreeconvectioninporousmedia:Firstfielddocumentationingroundwater1211RemkeL.VanDam,CraigT.Simmons,DavidW.Hyndman,andWarrenW.WoodReceived8December2008;revised24April2009;accepted1May2009;pub
2、lished9June2009.[1]Naturalfreeconvectionisaprocessofgreat[3]Thetheoryofunstableconvectivemotioninporousimportanceindisciplinesfromhydrologytometeorology,mediaiswellunderstood.Largecontrastsinfluiddensity,oceanography,planetarysciences,andeconomicgeology,duetodifferencesinsoluteconcentrat
3、ionsandtemper-andforapplicationsincarbonsequestrationandnuclearatures,cancausefingeringinstabilitiesassociatedwithwastedisposal.Ithasbeenstudiedforoveracentury–butunstablefreeconvection.Inthesesimplesettings,whenalmostexclusivelyintheoreticalandlaboratorysettings.thecriticalconditionfort
4、heonsetoffreeconvectionisDespiteitsimportance,conclusiveprimaryevidenceoffreeexceeded,theorypredictsthatnearlysquarecirculationsconvectioninporousmediadoesnotcurrentlyexistinawilldevelopwithasteadystatefingeringwavelengthequalnaturalfieldsetting.Here,wepresentrecentelectricaltotwicetheth
5、icknessofthelayerinwhichconvectionresistivitymeasurementsfromasabkhaaquifernearAbuoccurs[DierschandKolditz,2002].Dhabi,UnitedArabEmirates,wherelargedensity[4]Themassivebodyoftheoreticalworkandknowledgeinversionsexist.Thegeophysicalimagesfromthissitecompletelyeclipsestheverylimitedunderst
6、andingoffreeprovide,forthefirsttime,compellingfieldevidenceofconvectionprocessesinnaturalenvironmentsand,infact,fingeringassociatedwithnaturalfreeconvectioninpresupposestheexistenceofthesephenomenainthefield.groundwater.Citation:VanDam,R.L.,C.T.Simmons,D.Theoreticalknowledgeoffreeconvect
7、ivephenomenacon-W.Hyndman,andW.W.Wood(2009),Naturalfreeconvectionintinuestogrowintheabsenceofevenasinglereportedstudyporousmedia:Firstfielddocumentationingroundwater,Geophys.thatdirectlydemonstratestheexistenceoftheseprocessesinRes.Lett.,36,L11403,doi:10.1029/2008GL036906
