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.