Evolution de la pointe de la Coubre de 1973 à 1977

Pointe de la Coubre spit, located to the N of the Gironde estuary, is rapidly evoluting under particularly efficient wave and wind actions. Morphological evolution between 1973 an 1977 is described : the ultimate state of evolution is going to be reached : longshore bars and channels system is extending, diminishing upper beach slopes. The distal part of the spit is notably accreting, a beach barrier is forming, both tending to obturate Bonne Anse channel. In Bonne Anse lagoon, mud deposition processes, more efficient than transport and suspension ones, are enhanced by sand accumulation on spit neighbouring. Dunes seem to be stable, although vegetation tends to trap sands especially on distal part.