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INSTABILITES DES INTERFACES ECOULEMENT / FOND ERODABLE : APPROCHES ASYMPTOTIQUES

Abstract : The sand dunes in the desert and the ripples on the beach are problems of interaction between a flow (of water and/or wind) and a sand heap. We make the assumption that the disturbances remain confined in a thin viscous layer close to the bottom of the flow. Then we obtain analytical and numerical results of the stability of the long-term ripples on an erodable soil. These results are compared favourably with some experimental studies. Finally, we study the evolution of a single bump on a non erodable soil. In this case, we show that with the only length of saturation or the threshold of Shield number, it is possible to connect final configurations of dunes of different sizes, under different shearing, using self-similar transformations.
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https://tel.archives-ouvertes.fr/tel-00011485
Contributor : Jacques Kouamé Kan Kouakou <>
Submitted on : Saturday, January 28, 2006 - 12:02:37 PM
Last modification on : Friday, May 29, 2020 - 3:57:38 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:56:42 PM

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  • HAL Id : tel-00011485, version 1

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Jacques Kouamé Kan Kouakou. INSTABILITES DES INTERFACES ECOULEMENT / FOND ERODABLE : APPROCHES ASYMPTOTIQUES. Dynamique des Fluides [physics.flu-dyn]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011485⟩

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