My scientic activity concerns the development of concepts and methods in relation with shallow water dynamics. I am attracted by the domain that extends from the inner continental shelf oshore (water depth of a few tens of metres) to coastal watersheds onshore. In practice, I focuss on hydro-morphodynamics of shorefaces, lagoons and continental shallow water basins in general. I use numerical simulation, basin/ume experimentation, geophysical monitoring and imagery, and classical eld works. One of my nal goal is to provide to Earth Sciences with relevant and innovative physical concepts and models relative to littoral dynamics. I am convinced that interactions between disciplines can be at the origin of attractive scientic developments. As a consequence, I devote a signicant part of my research activity to build bridges between distinct communities, more especially applied mathematics, coastal engineering and geology.