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The sediment volume time evolution of the Anglet's underwater beaches has been analysed using a bathymetric data set covering the last 25 years. The sand volume appears to be more or less stable from 1979 to 1990 but decreases strongly after that period. It is shown that this behaviour is related to the artificial nourishment performed each year with dredging materials. We show that the underwater beaches have been continuously eroded over the last 25 years. During the first half period, the effects of this erosion are balanced by the large amount of dredging materials brought to the system. However, in the second half period the sudden diminishing of the quantity involved in this renourishment explains the strong sediment stock decrease. In a last part, numerical simulations show the frequent occurrence of a wave induced current which could explain the system erosion as well as the rivermouth recurrent sedimentation problems. Mots-cles:Volumes sedimentaires, erosion, dragages et rejets de sediment, houle, courants induits, embouchure de l'Adour.

Analyse de l’évolution du volume sédimentaire des plages subtidales d’Anglet