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1、萬方數(shù)據(jù)SurfaceSedimentGrainSizeAndTransportoftheBeibu6uIflnSouthChinaSeaAbstractTheBeibuGulfofSouthChinaSeaiSlocatedattheiunctionofChinaandVietnam，surroundedbytheVietnamcoastline，GuangxicoastlineandHainanIslandc02Lsfline，whichisaspecialgeographicalposition．NumerousriverbringterrigenousclastintotheBeibu
2、Gulf，Offshorematerialscarriedbytidecurrentsanderodedmaterialsproducedbywavesalsodeopsitedinit，theprovenancesalediverse．inaddition，thesouthoftheBeibuGulfiscoveredbyHainanIsland，oceanwaterflowingintothebaythroughtheopeningandthenorthisinterlinkedbytheQiongzhouStrait。Complicatehydrodynamicforcescreatev
3、ariesseabedtopography．Tidalsandridgesdistributedintheestuaryalongthenorthshore，westexitoftheQiongzhouStraitandthewestsideofHainanIsland．Therefore，exploringthecharacteristicsandtransporttrendofthebottomsedimentinBeibuGulfwouldcontributedirectlytounderstandtheprovenance，hydrodynamicforce，topographyoft
4、heregionandmakeafoundationfortheflLrtherresearch．Inthispaper,typesofsurfacesediment，distributionofthegrainsizeandparameteralestudiedbasedon96segmentsamples．Usingflemmingtrianglegraphicmethodtoconductedadepositiondynamicpartition，andGao—Collinsmethodtodescribethetransporttrendofsurfacesediment．MoreoV
5、er，bathymetricdata，chartdata，observedcurrentdataareapplietosimulatetidalflows，waveanderosion—depositionoftheresearchareasbyMIKE21software．Thesimulationresultsaleverifiedbydepthcomparison．Combinedsurfacesedimentparticlesizeanalysis，simulationresultsandthecharacteristicsoftopography，wemakeasystematics
6、tudyaboutthedeposition-erosionenvironmentanditsimpactontheformationoftopographyinthestudyaleBs，themainresultsaleasfollows．(1)thesurfacesedimenttypesinthestudyareasincludesandysilt，silt，sandy萬方數(shù)據(jù)clay,mud，muddysand，siltysand，gravellymuddysand，gravellysand，pebblysandandsandysiltaccountforthemajority．(2
7、)surfacesedimentsinthenorthshorearecoarser，becauselandmaterialsarecardedintotheseabyriversandrebuiltbywavesandtidalcurrent．ThewestopeningofQiongzhouStraitandwestsideofHainanIslandthetidalsandridgearea
