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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