This research axis deals with the operation and mutations of fluvial and coastal systems. Their hydrology, geomorphology and variability are studied using field sampling and measurements, remote sensing and numerical modeling. We aim at characterizing the sources and dynamics of natural and anthropic forcings and processes. The time scale ranges from Holocene to present considering engineering and planning at the watershed and littoral scales. Some key points are the sedimentary supply from sources to deltaic and estuary sinks, natural hazards like flooding, tsunamis, storms as well as vulnerability.