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Article Dans Une Revue Journal of Coastal Research Année : 2014

Growth of cuspate spits

Frederic Bouchette
Miguel Manna
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Pablo Montalvo
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  • PersonId : 932451
Alexis Nutz
Mathieu Schuster

Résumé

The present work concerns cuspate spits: slightly symmetrical geomorphic features growing along the shoreline in shallow waters. We develop a new formulation for the dynamics of cuspate spits. Our approach relies on classical paradigms such as a conservation law to the shoreface scale and an explicit formula for alongshore sediment transport. We derive a non-linear diffusion equation and a fully explicit solution for the growth of cuspate spits. From this general expression, we found interesting applications to quantify shoreline dynamics in the presence of cuspate spits. In particular, we point out a simple method for the datation of a cuspate spit given a limited number of input parameters. Furthermore, we develop a method to quantify the mean alongshore diffusivity along a shoreline perturbed by well-defined cuspate spits of known sizes. Finally, we introduce a formal relationship between the geometric characteristics (amplitude, length) of cuspate spits, which reproduce the self-similarity of these geomorphic features.
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Dates et versions

hal-01234952 , version 1 (27-11-2015)

Identifiants

Citer

Frederic Bouchette, Miguel Manna, Pablo Montalvo, Alexis Nutz, Mathieu Schuster, et al.. Growth of cuspate spits. Journal of Coastal Research, 2014, pp.47-52. ⟨10.2112/SI70-009.1⟩. ⟨hal-01234952⟩
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