Abstract
Deep-seated rockslides in alpine valleys involve huge volumes and evolve over a long time under the action of multiple triggers. Scenario assessment and early warning systems based on monitoring activities are often the only effective ways to mitigate related risks, and require a sound understanding of complex interacting controls. We discuss the Spriana rockslide, affecting the left-hand flank of Val Malenco (Italian Central Alps). Documented rockslide activity dates back to 1912, with major acceleration stages in 1960 and 1977–1978 and later minor reactivations. The rockslide is a compound slide involving up to 50 Mm3 of slope debris and fractured rock, with a basal failure zone up to 90 m deep and two main scarps. Rock mass characterisation based on laboratory and field analyses provided inputs to 2D Finite-Element modelling of long-term slope evolution. The results allowed re-evaluation of the mechanisms of the Spriana rockslide, accounting for both long-term controls related to valley deglaciation and the short-term complexity of groundwater response to rainfall inputs. We suggest that modelling long-term slope evolution may be required to correctly understand large rockslides in changing geomorphic systems.
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Acknowledgments
We thank G. Mannucci and L. Dei Cas (ARPA Lombardia) for data and support, and M. Laini for field and laboratory work. Research was partly supported by PRIN 2010–11 program (2010E89BPY_007).
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Agliardi, F., Crosta, G.B. (2014). Long-and Short-term Controls on the Spriana Rockslide (Central Alps, Italy). In: Sassa, K., Canuti, P., Yin, Y. (eds) Landslide Science for a Safer Geoenvironment. Springer, Cham. https://doi.org/10.1007/978-3-319-05050-8_39
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DOI: https://doi.org/10.1007/978-3-319-05050-8_39
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