(A) Satellite image of the study area, from Bing Maps. The study area is a part of the intertidal zone of Berck-Plage (North France) orientated in N-S axis on the English Channel side; red rectangle: location of the ortho-images (see Fig. 2) achieved on the area, covering an area of ca. 0.58 km². (B) Part of the intertidal zone of Berck-Plage at low tide displaying a ridge and runnel morphology. (C) Cross-shore profile of the intertidal zone showing the ridge and runnel morphology.