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Etude de l'instabilité d'une interface fluide-granulaire : Application à la morphodynamique des rides de plage

Abstract : Since a few years, physicists try to understand how a fluid such as water or air transports sand grains and how a structure like a sand dune can be formed by the retroaction between the fluid flow and the deformation of the fluid-granular interface. In this Thesis manuscript, we present laboratory experiments which consist in reproducing familiar structures such as beach ripples. These patterns are formed by water waves on the beach shore. We examine the initial wavelength selection as well as the coalescence process of the so-called rolling-grain ripples before their transition to the so-called vortex ripples which correspond to the saturated state of the interface. Thanks to the construction of a new experimental setup, we show for the first time with PIV measurements the flow structure associated to the rolling-grain ripples that is a transient vortex which appears at the ambient flow reversal. Moreover, we demonstrate the existence of a segregation in volume for the vortex ripples which is the consequence of the distribution of shear stress on the surface of the ripple.
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https://tel.archives-ouvertes.fr/tel-00006563
Contributor : Germain Rousseaux <>
Submitted on : Thursday, July 22, 2004 - 10:58:37 AM
Last modification on : Thursday, December 10, 2020 - 12:30:55 PM

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  • HAL Id : tel-00006563, version 1

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Germain Rousseaux. Etude de l'instabilité d'une interface fluide-granulaire : Application à la morphodynamique des rides de plage. Dynamique des Fluides [physics.flu-dyn]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00006563⟩

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