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MULTI-TECHNIQUE PERMANENT MONITORING OF A SLOW-MOVING COASTAL LANDSLIDE IN NORMANDY (2010)

The ‘Cirque des Graves’ and the ’Fosses du Macre’ landslides in Normandy (France) are slow- moving rotational and translational coastal landslides characterized by surface displacement of a few cm per year. The permanent landslide activity generates important economical and physical damages (building perturbations and destruction) in this area where the land pressure associated to coastal tourism is increasing. For these reasons, the landslides have been progressively monitored since 1984. Previous researches have demonstrated the efficiency of traditional instrumentation and the use of Global Positioning System (GPS) techniques to detect very low amplitude movements. Surface displacements correlated with rainfall and groundwater level analysis allowed to identify hydro-climatic thresholds initiating seasonal movements. A continuous monitoring at several points on the landslide allows specifying: 1) the slope kinematics, 2) the relationship between rainfall, groundwater level and velocity, 3) the temporal evolution of the different landslide sectors/areas. To establish a near real-time warning system, the monitoring network is based on the combination of data collection on the triggering factors and on the slope response in terms of kinematic. The state of the recent monitoring network is detailed and some preliminary results on the kinematics and on the triggering factors are presented. 

Reference:
PROCEEDINGS OF THE ‘MOUNTAIN RISKS’ INTERNATIONAL CONFERENCE / FIRENZE, ITALY, 24-26 NOVEMBER 2010
Organization:
UMR 6554 CNRS, LETG-Geophen, University of Caen-Basse-Normandie, Caen, France
France
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