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

详细信息	查看全文 | 推荐本文 |

• 作者：Olivier Brivois^a ; ^{o.brivois@brgm.fr} ; Dé ; borah Idier^a ; Jé ; r&ocirc ; me Thié ; bot^a ; Bruno Castelle^b ; Goné ; ri Le Cozannet^a ; Daniel Calvete^c
• 关键词：Modelling ; Linear stability model ; Morphodynamic ; Crescentic bar ; Truc Vert beach ; Aquitaine
• 刊名：Comptes Rendus Geoscience
• 出版年：2012
• 期刊代码：87_16310713
• 类别：ear
• 出版时间：May, 2012
• 卷：344
• 期：5
• 页码：277-287
• 文件大小：1185 K

摘要

Sandy barred beaches are often characterized by the presence of rhythmic patterns such as crescentic bars. In this article, 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 combinations 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 the 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.