Nearshore crescentic bars are observed all year long along the French Aquitanian Coast. Their shape can vary from a typical crescentic shape to a strongly dissymmetric shape, and their dynamic is still poorly understood. Nonlinear nearshore model and field survey are used to investigate Aquitanian Coast crescentic bar formation development and particularly their dissymmetric behaviour. Results show that circulation eddies are a key component of nearshore crescentic bar morphodynamic and that long periods of oblique swell can result in a dissymmetric crescent shape. This study leads to a conceptual model which is in agreement with field observations.
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