Recent advances in rock wall permafrost modelling to understand bedrock failure

International audience A recent increase in the rate of failure in periglacial rick walls has been attributed to permafrost degradation. To validate this hypothesis, we applied a simple transient thermal model to hundreds of observed rockfalls in the Mont Blanc massif and determine the statistical r...

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Bibliographic Details
Main Authors: Magnin, Florence, Josnin, J-Y, Legay, A, Ravanel, Ludovic, Deline, P, Duvillard, P
Other Authors: Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS), ANR-19-CE01-0018,WISPER,Processus thermo-mécaniques liés à l'eau et à la glace dans les fractures des parois alpines à permafrost(2019)
Format: Conference Object
Language:English
Published: HAL CCSD 2021
Subjects:
[SDE.ES]Environmental Sciences/Environmental and Society
[SDE]Environmental Sciences
[SDE.MCG]Environmental Sciences/Global Changes
Mont Blanc
permafrost
Online Access:https://hal.archives-ouvertes.fr/hal-03260747
https://hal.archives-ouvertes.fr/hal-03260747/document
Description
Summary:International audience A recent increase in the rate of failure in periglacial rick walls has been attributed to permafrost degradation. To validate this hypothesis, we applied a simple transient thermal model to hundreds of observed rockfalls in the Mont Blanc massif and determine the statistical relationship between rock wall temperature dynamics and failure occurrence. This is a first step towards prediction of rockfall probability. To improve our understanding of the processes leading to failure, we made a first attempt to cpuple thermal and hydrological models.The role of water flowing through bedrock fractures enhances the rate of permafrost degradation and affects the pressure field distribution.

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