Bank failureisanimportantphenomenoningeomorphicprocesses.Inthepresenceofriverbanksor steep bedforms,collapsemechanismsinducedbythewater-levelrisedeeplyaffectthebedevolution along withthesediment-transportprocesses.Inthispaperanalgorithmcapableofsimulatingsuch mechanisms inatwo-dimensionaltwo-phasemorphodynamicmodelispresented.AmixedCell- CenteredandNode-CenteredFinite-Volumediscretization,whichmakesuseofanunstructuredtrian- gular meshandallowstheslopeineachcelltobeunivocallydefined, isproposed.Thegeo-failure operatorguaranteesthatwheninthecellthebedslopeexceedsacriticalangle,thecorrespondingbed material andporewaterwillbecomepartofthebedtransportandwillthenfollowthedynamic equationsofthetwo-phase flow.Thealgorithmeffectivenessisshownbythenumericalreproductionof some experimentaltestsfromtheliterature.
A New Algorithm for Bank-Failure Mechanisms in 2D Morphodynamic Models with Unstructured Grids
IERVOLINO, Michele;VACCA, Andrea
2015
Abstract
Bank failureisanimportantphenomenoningeomorphicprocesses.Inthepresenceofriverbanksor steep bedforms,collapsemechanismsinducedbythewater-levelrisedeeplyaffectthebedevolution along withthesediment-transportprocesses.Inthispaperanalgorithmcapableofsimulatingsuch mechanisms inatwo-dimensionaltwo-phasemorphodynamicmodelispresented.AmixedCell- CenteredandNode-CenteredFinite-Volumediscretization,whichmakesuseofanunstructuredtrian- gular meshandallowstheslopeineachcelltobeunivocallydefined, isproposed.Thegeo-failure operatorguaranteesthatwheninthecellthebedslopeexceedsacriticalangle,thecorrespondingbed material andporewaterwillbecomepartofthebedtransportandwillthenfollowthedynamic equationsofthetwo-phase flow.Thealgorithmeffectivenessisshownbythenumericalreproductionof some experimentaltestsfromtheliterature.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
