The Role of Measure of Deep-Seated Displacements in the Monitoring Networks on Large-Scale Landslide

The aim of this research is to obtain a hydro-geomorphological and geotechnical model of the Arzeno and Prato di Reppia large scale landslide for the geo-hydrological risk management. Arzeno and Reppia are typical rural villages built in historical times at about 600 m a.s.l. near the main watershed, in the Entella river catchment (Ligurian Apennine): this is a very common situation in the Ligurian hinterland, where large landslides represent about 15% of the territory. For decades, there have been reports of slope instability phenomena in the villages of Arzeno and Prato di Reppia, which are outlined by several indirect kinematic indicators (mainly damage on buildings and infrastructures). In order to improve the comprehension of the landslide kinematic and the consequences on buildings and infrastructures, in 2017, a drill survey was carried out: one inclinometer case with robotized system and one piezometer with pressure transducer for continuous measurement have been installed in Arzeno. One inclinometer case and one piezometer case have been installed in Prato di Reppia village. The monitoring activities show a complex situation for the studied large-scale landslide: an evolution of the slope instabilities in several compartments with different kinematics and hydrogeological set-up is recognized, as well as a good convergence between satellite, GPS and inclinometric monitoring data.