A coupled model for simulating surface water and groundwater interactions in coastal wetlands

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1、HYDROLOGICALPROCESSESHydrol.Process.25,35333546(2011)Publishedonline25April2011inWileyOnlineLibrary(wileyonlinelibrary.com)DOI:10.1002/hyp.8079AcoupledmodelforsimulatingsurfacewaterandgroundwaterinteractionsincoastalwetlandsLi-RongYuan,1,2PeiXin,1,3*JunKong,3LingLi1,3

2、andDavidLockington11NationalCentreforGroundwaterResearchandTraining,SchoolofCivilEngineering,TheUniversityofQueensland,Brisbane,Queensland,Australia2SchoolofEngineering,TheUniversityofSunYat-Sen,GuangZhou,China3StateKeyLaboratoryofHydrology-WaterResourcesandHydraulicE

3、ngineering,HohaiUniversity,Nanjing,ChinaAbstract:Coastalwetlandsarecharacterizedbystrong,dynamicinteractionsbetweensurfacewaterandgroundwater.Thispaperpresentsacoupledmodelthatsimulatesinteractingsurfacewaterandgroundwaterflowandsolutetransportprocessesinthesewetlands.

4、Thecoupledmodelisbasedontwoexisting(sub)modelsforsurfacewaterandgroundwater,respectively:ELCIRC(athree-dimensional(3-D)finite-volume/finite-differencemodelforsimulatingshallowwaterflowandsolutetransportinrivers,estuariesandcoastalseas)andSUTRA(a3-Dfinite-element/finite-dif

5、ferencemodelforsimulatingvariablysaturated,variable-densityfluidflowandsolutetransportinporousmedia).Bothsubmodels,usingcompatibleunstructuredmeshes,arecoupledspatiallyatthecommoninterfacebetweenthesurfacewaterandgroundwaterbodies.Thesurfacewaterlevelandsoluteconcentrat

6、ionscomputedbytheELCIRCmodelareusedtodeterminetheboundaryconditionsoftheSUTRA-basedgroundwatermodelattheinterface.Inturn,thegroundwatermodelprovideswaterandsolutefluxesasinputsforthecontinuityequationsofsurfacewaterflowandsolutetransporttoaccountforthemassexchangeacross

7、theinterface.Additionally,fluxfromtheseepagefacewasroutedinstantaneouslytothenearestsurfacewatercellaccordingtothelocalsedimentsurfaceslope.Withanexternalcouplingapproach,thesetwosubmodelsruninparallelusingtimestepsofdifferentsizes.Thetimestep(tg)forthegroundwatermode

8、lissettobelargerthanthat(ts)usedbythesurfacewatermodelforcomputationalefficiency:tgDMðtswhereMisanintegergreaterthan1.Data