| The coast stretching from the Nez of Jobourg and the Cape of Carteret, exposed to western marine fluxes, is characterized by a succession of rocky headlands and of bays bordered by recessing sand dunes. The intertidal zone is mostly sandy whereas the infralittoral zone consists of coarse sediments and pebbles, all this in relation to strong tidal currents. These tidal currents, avatars of the 1.2 knots drift of the Channel waters towards the North Sea, are conditioned by the filling up and emptying of the Breton-Norman Gulf where currents are among the strongest worldwide. Their anti-clockwise gyration becomes alternative and violent in tight passages (Raz Blanchard) The resulting bravage explains the good homogeneity of the water masses whose seasonal... |
