CHARACTERISTIC ANALYSIS OF THE PLUNGING OF TURBIDITY CURRENTS

(整期优先)网络出版时间:2010-02-12
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Turbiditycurrentsareflowsdrivenbysuspendedsedimentofflood-inducedturbidriverwaterwithexcessdensity.Suchcurrentsareoftenthegoverningfactorinreservoirsedimentationbytransportingfinematerialsoverlongdistancesanddeliveringthemajorityofdeposition,whichthusreducesthestoragecapacity.Therefore,thedesignandoperationofareservoirrequiresanaccuratepredictionofitsoccurrenceconditionandplungingposition,whichistheobjectiveofthepresentstudy.Thisarticlepresentsaverifiedalgebraicslipmixturemodelincludingmomentum,continuityandalgebraicvelocityexpressionstosimulate2-Dturbiditycurrents.Testexperimentsinamultiphaseflumewerecarriedout.Reynoldsnumber,sedimentconcentrationanddensimetricFroudenumberwereusedasparametersintheoccurrenceconditionanalysis.Theplungingofturbiditycurrentsmayproducerefluxandbackflowduetothepingflowatthesurfaceoftheclearwater.ThesimilarexperimentalresultswerealsoobtainedbyPIVmeasurements