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1、WATERRESOURCESRESEARCH,VOL.48,W02502,doi:10.1029/2011WR010678,2012Tidalinfluenceonseawaterintrusioninunconfinedcoastalaquifers1,231451,3WoeiKeongKuan,GuangqiuJin,PeiXin,ClareRobinson,BadinGibbes,andLingLiReceived16March2011;revised21November2011;accepted
2、6December2011;published2February2012.[1]Studiesofseawaterintrusioninunconfinedcoastalaquiferstypicallyneglectoceanicoscillationssuchastidesandassumeastaticseawardboundaryconditiondefinedbythemeansealevel.Laboratoryexperimentsandnumericalsimulationswerecond
3、uctedtoinvestigatetheinfluenceoftidaloscillationsonthebehaviorofthesaltwaterwedge.Fortheconditionsexamined,theexperimentsshowedthatanuppersalineplumeformedintheintertidalzoneduetotide-inducedseawatercirculation.Thepresenceoftheuppersalineplumeshiftedthefr
4、eshgroundwaterdischargezoneseawardtothelow-tidemarkandrestrictedtheintrusionofthesaltwaterwedge.Theoverallseawaterintrusionextent,asindicatedbythewedgetoelocation,wasreducedsignificantlycomparedwiththenontidal(static)case.Resultsfromthenumericalmodelmatch
5、edtheseexperimentalobservationsandfurtherdemonstratedthesimilartypeoftidalinfluenceonthesaltwaterwedgeinafield-scaleaquifersystem.TheGlover(1959)solutionforpredictingthesaltwaterwedgewasmodifiedtoaccountforthetidaleffectbyincludingthetide-inducedcirculation
6、asa‘‘recharge’’totheaquifer.Thefindingshighlightthesignificantimpactofthetideinmodulatingthegroundwaterbehaviorandsalt-freshwaterdynamics,notonlywithinbutalsolandwardoftheintertidalzone.Citation:Kuan,W.K.,G.Jin,P.Xin,C.Robinson,B.Gibbes,andL.Li(2012),Tidal
7、influenceonseawaterintrusioninunconfinedcoastalaquifers,WaterResour.Res.,48,W02502,doi:10.1029/2011WR010678.1.Introductiontheseprocessesreducethehydraulicgradientthatdrivesfreshgroundwaterdischargetotheocean[Wernerand[2]Coastalaquifersareoftenanimportant
8、sourceofSimmons,2009;Changetal.,2011].Variousapproaches,freshwatersupplyincoastalregions.Excessiveground-includinganalyticalandnumericalmodels,havebeenwaterextractionhasledtoseawaterintrusionandwaterdevelopedtoexploreandqu
