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Sediment bypassing mechanisms at river mouths : examples in the mediterranean.

Abstract : River mouths along sandy coastlines are influenced by alongshore transport of littoral sands. Here, we study the mechanisms of alongshore sediment bypassing at two river mouths along the French Mediterranean coast. Both river mouths are exposed to the same wave energy, and have similar hydraulic behaviors. We find that bypassing rates are strongly dependent on river discharge and wave energy. When the river mouths are closed, longshore transport occurs as on an open beach for both sites excepted when the shoals are located upstream inducing a discontinuity with adjacent shorelines. The main difference is observed during the most important floods. At the natural Têt river mouth, bypass is mainly associated with spit platform breaching, while at the Agly river, the presence of jetties induced an export of sediment in the nearshore, then transport by waves to the downdrift coast.
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https://hal-brgm.archives-ouvertes.fr/hal-02083147
Contributeur : Yann Balouin <>
Soumis le : jeudi 28 mars 2019 - 17:23:24
Dernière modification le : mardi 31 mars 2020 - 17:04:04

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  • HAL Id : hal-02083147, version 1

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Yann Balouin, Eric Palvadeau, François Bourrin. Sediment bypassing mechanisms at river mouths : examples in the mediterranean.. Proceedings Coastal Sediments, 2019, Proceedings Coastal Sediments 2019. ⟨hal-02083147⟩

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