Abstract

We investigate a 15.6 km2 landslide-prone catchment in the Apennine Mountains (southern Italy). The catchment is traversed by an 11 km long mid-slope road, which has been damaged by a large number of predominantly shallow landslides. Laboratory tests showed that slope materials, derived predominantly from clay-rich flysch units, have poor geotechnical properties (effective residual friction median values around 11°, effective residual cohesion close to zero). Slope stability analyses were first conducted of representative failed slopes traversed by the road, and for which geotechnical parameters were directly available from the laboratory tests. Site-specific slope stability modelling was carried out following a limit equilibrium method for the determination of a factor of safety. Parametric analysis revealed that the stability of slopes is critically dependent on the groundwater conditions. This is consistent with recurrent episodes of landslide reactivation during particularly wet seasons characterized by periods of high groundwater levels, as documented by in situ monitoring. The evaluation of the site-specific models has enabled extending the slope stability analysis to the full hillslope and wider catchment scales. This was done by exploiting PESERA-L, a freeware software developed to assist in shallow landslide hazard assessment in watersheds. The produced landslide probability maps, fine-tuned and tested using, respectively, the 2006 and 2011 landslide inventories, improve our understanding of differences in susceptibility to slope failure throughout the catchment.

Autore Pugliese

• Casarano Domenico , Wasowski Janusz , Limoni Pier Paolo

Tutti gli autori

• M. Dipalma Lagreca; J. Wasowski; L. Borselli; T. Dijkstra; D. Casarano; P. P. Limoni

Titolo volume/Rivista

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Anno di pubblicazione

2015

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