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1、Estuarine,CoastalandShelfScience61(2004)477–490www.elsevier.com/locate/ECSSModelinghydrodynamicsandsalttransportintheAlafiaRiverestuary,FloridaduringMay1999–December2001XinJianChenResourceConservation&DevelopmentDepartment,SouthwestFloridaWaterManagementDistrict,7601Highway301North
2、,Tampa,FL33637,USAReceived26September2003;accepted15June2004AbstractHydrodynamicsandsalttransportprocessesintheAlafiaRiver,atributarytoTampaBayinsouthwestFlorida,werestudiedusinganefficientlaterallyaveragedmodelthatisunconditionallystablewithrespecttogravitywaves,bottomandwallfrictio
3、ns,andtheverticaleddyviscosityterm.Thesimulationdomainisthedownstream24kmoftheriverthatcontainstheentiretidalreachandaportionoftheupstreamslopingchannelwheretheriverbedishigherthanthetidalwaterelevations.Boundaryconditionsattheupstreamboundaryarespecifiedwithmeasuredfreshwaterinflow
4、,whilethoseatthedownstreamboundaryarespecifiedwithmeasuredreal-timedataofsurfaceelevationandsalinityprofile.ThemodelwascalibratedandverifiedwithwatersurfaceelevationsandsalinitiesmeasuredatthreestationswithinthesimulationdomainfortheperiodbetweenMay1999andDecember2001.Themeasurements
5、tationattheupstreamboundarygaugesabout79%oftheAlafiaRiverwatershed.Theremaining21%ofthewatershedisnotgaugedduetothetidalinfluence.ThisstudyusedtheHydrologicalSimulationProgram-Fortran(HSPF)[Bicknelletal.,1997.HydrologicalSimulationProgram-Fortran,User’sManualforVersion11.EPA/600/SR-
6、97/080.U.S.EnvironmentalProtectionAgency,NationalExposureResearchLaboratory,ResearchTrianglePark,NC27711.]modeltoestimatefreshwaterrunofffromthedownstream21%ofthewatershed.Modelsimulationsshowthatrunofffromtheun-gaugedportionoftheAlafiaRiverwatershedisanimportantfactorcontrollingthes
7、alinitydistributionintheAlafiaRivereventhoughthemajorityoftheAlafiaRiverwatershedisgauged.Basedonmodelresults,anempiricalrelationshipthatrelatesthelocationofthefreshwater–saltwaterinterfaceatthesurfacelayerwiththetotaldailyfreshwaterinflowisobtained.Theempiricalrelationshipsuggeststh
8、atthelocationofthefreshwater–salt
