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Poster De Conférence Année : 2022

Assessing the sensitivity of steep rock slope permafrost to water infiltration under various fracture geometries: a numerical approach

Résumé

Water infiltration and circulation in frozen bedrock fractures may enhance heat transport from the surface to the permafrost body and play a role in rock slope failure. However, such processes occurring in steep rock slope permafrost are difficult to investigate because of their non-linearity and anisotropy. In this communication, we will present recent developments conducted in the frame of the WISPER project (“Water and Ice related thermo-mechanical processes in the fractures of Steep alpine bedrock Permafrost”, funded by the French National Agency for Research). The FeFlow® (DHI-WASY) software is used to model and study the coupled heat and mass transfer in a simple alpine geometry that typically represents steep rock slope affected by permafrost and seasonal freeze and thaw cycles at c.a.3500 m a.s.l. Using a synthetic annual forcing for rock surface temperature, several case studies are implemented to investigate the sensitivity of permafrost degradation to various fracture networks features: width and density, orientation, angle, shape, amount and seasonality of the input water flux. The thermal and hydrogeological variables (notably temperature fields, and hydrostatic pressures), are compared to a base case without any fracture, in order to assess their sensitivity to the studied parameters. The comparison between these theoretical simulations and field measurements is considered through a number of diagnostic variables of the infiltrating water. The prospective framework to carry out field measurements and compare with the simulations will be presented.
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Dates et versions

hal-04032881 , version 1 (30-03-2023)

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  • HAL Id : hal-04032881 , version 1

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Josué Bock, Florence Magnin, Jean-Yves Josnin, Matan Ben-Asher. Assessing the sensitivity of steep rock slope permafrost to water infiltration under various fracture geometries: a numerical approach. International Mountain Conference, Sep 2022, Innsbruck, Austria. , 2021. ⟨hal-04032881⟩
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