Landslide Consequences and Post Crisis Management Along the Coastal Slopes of Normandy, France

摘要

The coastal slopes of the Pays d’Auge plateau (Calvados, Normandy, France) are regularly affected by landslides mainly triggered by rainfall. The study area between Trouville and Honfleur has been subject to slow continuous displacements (5–10 cm.year~(-1)) for several centuries, punctually disturbed by episodes of acceleration with metric displacements. The landslides are located along a very touristic coastal area where increasing land pressure is evident. Because of the potential for crisis and the seasonal landslide activity, direct or indirect, immediate and delayed impact have been identified. Since the first reactivation of the largest landslide in 1982, direct damages to infrastructures (roads, buildings. . .) and indirect damages to the economy have been observed. The objective of this work is to present the risk assessment carried along the Normandy coasts through the: (1) evaluation of the long-term landslide consequences, (2) identification and value of the actual elements at risk including potential consequences and (3) analysis of the policy responses during the past 30 years.