International audienceIn the wetlands of the Danube delta floodplain, flooding is a major natural risk. Since 2000, the coastal wetland has been seriously impacted by floods in 2002, 2005, 2006 and 2010. Using hydrological and satellite observations acquired in 2009 and during the summer of 2010, this paper tackles the issue of forecasting risk based on land cover information and observations. A major objective of this methodological work consists in exploring several types of data from the Japanese ALOS satellite. These data are used to illustrate a multitemporal radar data processing methodology based on temporal entropy analysis enabling change detection in the floodable areas of the Danube delta.Dans le delta du Danube, le risque d'inon...