Modeling rockwall permafrost to understand periglacial rock slope failures - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2021

Modeling rockwall permafrost to understand periglacial rock slope failures

Philip Deline
  • Fonction : Auteur
  • PersonId : 1107079
Pierre-Allain Duvillard
Jean-Yves Josnin
Alexandre Legay
  • Fonction : Auteur
Ludovic Ravanel

Résumé

Rock slope failures are increasingly affecting high mountain rock walls, notably during hot summers (e.g. Ravanel et al., 2017). The common presence of ice in rock fall scars evidences the likely role of permafrost (i.e. ground which temperature is permanently ≤ 0°C) in rock fall triggering. Laboratory tests and mechanical models suggest that several permafrost-related processes influence bedrock stability (e.g. Krautblatter et al., 2013). Alteration of ice in joints due to the conductive heat transfer from the surface to depth, and advective heat flux by water infiltration in the fractures are thought to be the dominant processes in permafrost degradation (i.e. warming and thawing) causing rock wall destabilization. Water infiltration could also provoke high hydrostatic pressures at perched water table formed by the permafrost body and ice-filled fractures. To assess high mountain rock wall stability, it is thus important to know how permafrost is distributed, evolves, and interacts with hydrological processes. We here present recent developments in modelling rock wall permafrost and how models can help understanding rock slope destabilization at various space and time scales.
RSS_Magnin_2021_Permafrost.pdf (3.12 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04055509 , version 1 (02-04-2023)

Identifiants

  • HAL Id : hal-04055509 , version 1

Citer

Florence Magnin, Philip Deline, Pierre-Allain Duvillard, Jean-Yves Josnin, Alexandre Legay, et al.. Modeling rockwall permafrost to understand periglacial rock slope failures. Symposium Rock Slope Stability 2021, Nov 2021, Chambéry, France. ⟨hal-04055509⟩
10 Consultations
6 Téléchargements

Partager

Gmail Facebook X LinkedIn More