The «Loire» research project is firmly based on an interdisciplinary approach of the fluvial environments. We study alluvial archaeological sites and floodplain geomorphology and palaeoecology. The Loire Valley floodplain is influenced by both physical and human activity. In the Middle Ages, especially from the XVth century onwards, societies tried to build their own space in the floodplain, erected «levées» and tried to force the adjacent river Indre and Cher to their junction with the Loire river.Le programme de recherche sur la Loire associe, dans un travail interdisciplinaire, l'ensemble des chercheurs travaillant sur le bassin versant. Les études sont fondées sur des fenêtres d'observation où se situent des sites archéologiques à chron...