The present study is focused on complex rotational-translationnal landslides occurring along the coastal slopes of Calvados. The landslides kinematics is characterized by slow and permanent activity ranging from a few millimeters to a few centimeters per year. The slow velocity can be affected by major accelerations explained by combined triggering factors, as prolonged rainfall. The complexity of these phenomena is linked to their temporal and spatial heterogeneity dynamics. Furthermore, their location in urban coastal environment induces high socio-economic issues. For better understanding of these complex landslides processes, the study focused on: * (1) the internal structure characterization, with the help of geophysical, geotechnical and geomorphological data; * (2) the hydrological and hydrogeological specificities of the slope with hydrodynamics characterization; * (3) the kinematics of the landslides measurement from monitoring network, to put in forward the spatial and temporal heterogeneities; * (4) the identification of critical piezometric and rainfall thresholds inducing acceleration; * (5) the assessment of consequences and the risk management linked to several acceleration crisis. And finally the research focused on the actual element at risk and landslide extension possibilities.
