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Large high-speed gravity rock slope movements: Contributions of field observations in order to understand propagation and deposition processes. Application to three alpine cases: La Madeleine (Savoie, France), Flims (Graubunden, Switzerland) and Köfels (Tyrol, Austria)

Nicolas Pollet
Abstract : Large high-speed rock slope movements are specific landslides of more than 10_6 m3 and with velocity exceeding 100 km.h-1. Slope is predisposed to break down by water and dynamic triggering factors. Excessive mobility of these rock masses remains misunderstood and required more field work. Three alpine rock slopes present exceptional outcropping conditions: the rockslide-avalanche of La Madeleine, the rockslide of Flims and the rockslide of Köfels. Description of structures fixed in the deposits, original or due to transport, is proposed. The structures are associated to granulometric reduction, producing fine grains. Source areas and deposits of the La Madeleine rockslide-avalanche were analysed to quantify this particle-size reduction with transport. A continuous deformation affects the rock mass that has to evolve from a rockslide to a rock-avalanche. This evolution is counteracted by deposition factors: topographic geometry, substratum properties and mechanical characteristics of the rock material.
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https://pastel.archives-ouvertes.fr/pastel-00000820
Contributor : Ecole Des Ponts Paristech <>
Submitted on : Wednesday, September 8, 2004 - 8:00:00 AM
Last modification on : Monday, October 19, 2020 - 11:00:06 AM
Long-term archiving on: : Monday, October 4, 2010 - 12:46:17 PM

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Nicolas Pollet. Large high-speed gravity rock slope movements: Contributions of field observations in order to understand propagation and deposition processes. Application to three alpine cases: La Madeleine (Savoie, France), Flims (Graubunden, Switzerland) and Köfels (Tyrol, Austria). Sciences of the Universe [physics]. Ecole des Ponts ParisTech, 2004. English. ⟨pastel-00000820⟩

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