The aim of this thesis is to characterise the wave climate and the longshoredynamics in the area around Beaduc’s gulf and spit in the coast of the RhoneDelta.Departing from a wave data record at an intermediate location nearBeaduc’s spit, the wave climates offshore, nearshore and at the breaker zone havebeen determined. A general methodology for the obtention of such data in anyother situation has been established, involving the use of SWAN and “shoaling +refraction” propagation methods.The effects of the waves on the coast’s longshoreevolution have been studied by applying CERC and Kamphuis formulations inpoints along the shore fed with the wave climate data previously acquired.Kamphuis formulation has only partially been applied with a varying grain size.