Modelling of sediment movement in the surf and swash zones
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摘要: Under the action of marine currents, non-cohesive sediments evolve by bed-load, by saltation or suspension depending on their granulometry. Several authors have considered that the movement of sediment is bidimensional and modelized the effects of swell by a constant velocitynear the seabed. Here we have studied the velocity profile of fluctuating currents near the seabed and studied the movement of sediment in 3D. The results show that in the areas of study (surf and swash) the movement of sediment occurs in a volume, and the evolution of sediment varies from an areato another. The obtained theoretical profiles of the position and velocity vectors confirm the observations of several authors.Abstract: Under the action of marine currents, non-cohesive sediments evolve by bed-load, by saltation or suspension depending on their granulometry. Several authors have considered that the movement of sediment is bidimensional and modelized the effects of swell by a constant velocitynear the seabed. Here we have studied the velocity profile of fluctuating currents near the seabed and studied the movement of sediment in 3D. The results show that in the areas of study (surf and swash) the movement of sediment occurs in a volume, and the evolution of sediment varies from an areato another. The obtained theoretical profiles of the position and velocity vectors confirm the observations of several authors.
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Key words:
- non-cohesive sediments /
- sediment dynamics /
- swell /
- trajectory of sediment /
- velocity drive
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Auffret G A. 1983. Dynamique sédimentaire de la Marge Continentale Celtique [dissertation]. France: Université de Bordeaux Ancey C. 2013. Hydraulique à surface libre crues, vagues, et ruptures de barrage Phénomènes de propagation, outils de simulations, applications. Note de Cours au Laboratoire Hydraulique Enviro-nnementale. Ecole Polytechnique Fédérale de Lausanne Blanchard V, Abdel A M. 2007. Mécanisme de transport des sédimen-ts: Erosion et dépôt, application au littoral nord-pas de Calais. Promotion 2007. Ecole des mines de DOUAI Bijker E W. 1992. Mechanics of sediment transport by the combinati-on of waves and current. 23rd Int. Conf. on Coastal Engineering, 147-173 Catherine V. 2004. Modélisation du transport littoral. VIIIème Journées Nationales Génie Civil-Génie Côtier, Compiègne, 7-9 transport equations for coarse-grained beaches. Coastal Engineering, 40(3): 243-275 Déborah I, Emmanuel R, Rodrigo P. 2008. Influences relatives desage-nts hydrodynamiques sur la mobilité des sédiments non-cohésifs des Pertuis Charentais. Xème Journées Nationales Génie Côtier-Génie Civil, 14-16 Ehrhold A, Guillou S, Auffret J P, et al. 2003. Bed load transport model isation in a bay characterized by a macrotidal environment: exa-mple of the Mont-Saint-Michel Bay (Manche, France). Oceanol-ogica Acta, 26: 443-455 Gargani J. 2004. Contribution à l'étude de la vitesse critique d'érosion des sols cohésifs. Comptes Rendus Geoscience, 336(6): 561-566 Komar P D, Inman D L. 1970. Long shore sand transport on beaches. Journal of Geophysical Research, 75(30): 5914-5927 Longo S, Marco P, Losada I J. 2002. Turbulence in the Swash and Surf zones: a review. Coastal Engineering, 45(3): 129-147 Pye K. 1994. Sediment Transport and Depositional Processes. Blackw-ell Scintific Publications, 397 Sylvain O, Janvier. 2011. Cours: Dynamique Sédimentaire. Université Abomey Calavi, Faculté des Sciences et Techniques, Cotonou, Bénin Thanh H S, Temperville A. 1991. Etude Hydrodynamique et sédimen-taire de la couche limite turbulente oscillatoire sur le fond Marin. Troisièmes Journées de l'Hydrodynamique, Oceanologica Acta (Elsevier), 26: 443-455
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