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2014 | OriginalPaper | Chapter

https://static-content.springer.com/image/chp%3A10.1007%2F978-3-319-05050-8_39/MediaObjects/319773_1_En_39_Figa_HTML.gif Long-and Short-term Controls on the Spriana Rockslide (Central Alps, Italy)

Authors : Federico Agliardi, Giovanni B. Crosta

Published in: Landslide Science for a Safer Geoenvironment

Publisher: Springer International Publishing

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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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Literature
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Metadata
Title
Long-and Short-term Controls on the Spriana Rockslide (Central Alps, Italy)
Authors
Federico Agliardi
Giovanni B. Crosta
Copyright Year
2014
DOI
https://doi.org/10.1007/978-3-319-05050-8_39