Analysis of Hydro-meteorological Monitoring Data Collected in Different Contexts Prone to Shallow Landslides of the Oltrepò Pavese (Northern Italy)

This work presents the results of the continuous monitoring of two slopes of the Oltrepò Pavese (northern Apennines, north-western Italy), representative of different contexts usually affected by shallow landslides. The first monitored site is representative of high gradient slopes with silty soils. The second one represents slopes with low-medium slope gradient and clayey soils. Hydrological monitoring allowed to identify the responses of the soils to different rainy or dry periods, focusing in particular on the conditions which could predispose landslides triggering. As demonstrated by monitoring and by slope stability analyses through a simplified physically-based model, increase in pore water pressure during most intense rainfalls in wet periods, sometimes with development of perched water table, can promote slope instability.