Brittany is particularly exposed to storms and for the coastal systems extending from foreshores to dune ridges, they correspond to morphogenic episodes of short duration but of high intensity, with substantial consequences in terms of submersion of low-lying coastal areas and of the evolution dune, intertidal and foreshore accumulations. This was clearly demonstrated by the winter of 2013-2014, when many events of this type took place. These marine meteorological events are indeed the source of accelerated erosion of numerous coastal accumulations which occur in the contemporary context of limited sediment resources for all coastal accumulations, from foreshores to dune ridges. Therefore, knowledge about coastal sedimentary budgets, recycling and displacement of sediment bodies on the shelf and above all on foreshores is essential. On the one hand, it provides better understanding of changes in the shore line and the ensuing coastal hazards at various spatial and temporal scales. On the other hand, this knowledge is integral to defining any strategy for coastal sediment stock management, particularly those drawn up in the framework of national strategies for shore line management. Related project: ANR CEP and S programme and multidisciplinary PhD proposed at the Doctoral school of marine sciences (EDSM) of the European Institute for Marine Studies and hosted by the LETG-Brest Géomer (UMR 6534 CNRS) and Ocean domains (UMR 6538 CNRS) laboratories.