Réponse de la nappe d'eau sous forçage infra-gravitaire sur la plage du Truc Vert

As part of ECORS program, which is a qualification campaign for sandy beach morphodynamics model, an instrumental field study has been conducted on the Truc Vert beach in Aquitaine, France. A key-point of the understanding of sandy beaches dynamics is the knowledge of the interactions between surface and groundwater hydrodynamics, in particular between swash and beach watertable and their impact on accretion and erosion processes above the still water level. This study shows the infragravity energy predominance in the vicinity of the swash zone and its transfer inside the aquifer, especially by pressure waves.