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Erosion and sedimentation of a bump in fluvial flow

✍ Scribed by Pierre-Yves Lagrée

Book ID
104446177
Publisher
Elsevier Science
Year
2000
Tongue
French
Weight
174 KB
Volume
328
Category
Article
ISSN
1620-7742

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✦ Synopsis

The 2D laminar quasistationary interacting boundary layer flow with mass transport of a suspended sediment is solved over an erodable bump (or dune) in the case of a fluvial régime. It is assumed that if the skin friction goes over a threshold value, the bump is eroded, then, the concentration of sediment in suspension is convected but falls at a constant settling velocity. This changes the shape of the dune, exemples of displacement toward final equilibrium states are presented. © 2000 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS

interacting boundary layer / sedimentation / erosion / asymptotic methods

Érosion et sédimentation d'une dune en régime fluvial

Résumé.

Nous étudions un écoulement 2D stationnaire laminaire en régime fluvial avec le point de vue de la couche limite interactive. Les équations dynamiques et l'équation de la masse sont résolues simultanément. La forme de la dune évolue de par l'arrachement qui se produit lorsque le frottement pariétal dépasse une certaine valeur seuil et de par la sédimentation qui se produit à vitesse constante. Des exemples de déformations de dunes sont présentés.

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