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On the use of linear stability model to characterize the morphological behaviour of a double bar system. Application to Truc Vert Beach (France).

Abstract : Sandy barred beaches are often characterized by the presence of rhythmic patterns such as crescentic bars. In this paper, a linear stability analysis (LSA) model is used to characterize the morphological behaviour of the double bar system of Truc Vert beach. Using a limited number of combination of representative bathymetries, wave classes and water levels, the morphodynamic response of the system is analysed, focussing on the geometrical characteristics of 3D patterns generated with the model. These characteristics are described and then compared with available observations. The shapes and the wavelengths of the instabilities predicted by the model compare well with field observations. Thus, the use of linear stability model, with representative hydrodynamic conditions and bathymetries of the considered site, allows a characterization of the global morphodynamic behaviour of a double-barred system.
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Soumis le : lundi 9 juillet 2012 - 14:26:57
Dernière modification le : vendredi 18 septembre 2020 - 14:34:09
Archivage à long terme le : : mercredi 10 octobre 2012 - 02:50:24

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Olivier Brivois, Déborah Idier, Jérôme Thiebot, Bruno Castelle, Gonéri Le Cozannet, et al.. On the use of linear stability model to characterize the morphological behaviour of a double bar system. Application to Truc Vert Beach (France).. Comptes Rendus Géoscience, Elsevier Masson, 2012, 344 (5), pp.277-287. ⟨10.1016/j.crte.2012.02.004⟩. ⟨hal-00715885⟩

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