The morpholgy and hydrodynamics of the macrotidal beach of Dune d’Amont, in northern France, characterised by intertidal bars, were surveyed during storm conditions. The absence of clear cross-shore bar migration in spite of the energetic context was due to weak cross-shore currents, although significant storm wave heights attained up to 1.5 m. However, tide-induced longshore flows considerably strengthened by wind forcing during the storms was responsible for the longshore migration pattern shown by the bar-trough systems. These longshore flows also account for the longshore variations in cross-shore profile volumes.
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