Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls
International audience The increased rockfall activity in high Alpine ranges observed during the last two decades is commonly attributed to permafrost degradation associated with atmospheric warming. Although the connection between mountain permafrost warming and rockfall initiation is intuitive and...
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ftunivsavoie:oai:HAL:hal-03886203v1 2024-02-11T10:04:40+01:00 Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls Ben-Asher, Matan Magnin, Florence Bock, Josué Josnin, Jean-Yves Westermann, Sebastian Ravanel, Ludovic Deline, Philip Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) University of Oslo (UiO) 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) Flatrock, United States 2022-06-20 https://hal.science/hal-03886203 https://hal.science/hal-03886203/document https://hal.science/hal-03886203/file/PRF2022_poster_BenAsher.pdf en eng HAL CCSD hal-03886203 https://hal.science/hal-03886203 https://hal.science/hal-03886203/document https://hal.science/hal-03886203/file/PRF2022_poster_BenAsher.pdf http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess PRF2022 https://hal.science/hal-03886203 PRF2022, Jun 2022, Flatrock, United States. https://www.prf2022.org/ [SDE.ES]Environmental Sciences/Environment and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/conferenceObject Conference poster 2022 ftunivsavoie 2024-01-23T23:36:01Z International audience The increased rockfall activity in high Alpine ranges observed during the last two decades is commonly attributed to permafrost degradation associated with atmospheric warming. Although the connection between mountain permafrost warming and rockfall initiation is intuitive and supported by field and lab observations, the physical processes behind it are still poorly understood. In this study, we focus on the role of hydrologic and thermo-mechanical processes acting in fractures of steep alpine bedrock permafrost. Key challenges of the model scheme are related to the quantification of snow meltwater available for infiltration at different time scales. We combine field observations from a high elevation Alpine site in the Mont-Blanc massif (the Aiguille du Midi, 3842 m a.s.l) with numerical models of surface heat balance and mass transport. We were able to simulate snowmelt between 1959-2020 using the SAFRAN S2M dataset and show that annual snowmelt vary between 0.1-0.4 m/year and that its infiltration potential is limited by the accumulation of an ice crust in the rock-snow interface. Progress on these issues will help us decipher the governing processes in the degradation of high mountain permafrost and its link with rockfall occurrence. Conference Object Ice permafrost Université Savoie Mont Blanc: HAL Flatrock ENVELOPE(-120.283,-120.283,56.267,56.267) Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
English |
topic |
[SDE.ES]Environmental Sciences/Environment and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.ES]Environmental Sciences/Environment and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes Ben-Asher, Matan Magnin, Florence Bock, Josué Josnin, Jean-Yves Westermann, Sebastian Ravanel, Ludovic Deline, Philip Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls |
topic_facet |
[SDE.ES]Environmental Sciences/Environment and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The increased rockfall activity in high Alpine ranges observed during the last two decades is commonly attributed to permafrost degradation associated with atmospheric warming. Although the connection between mountain permafrost warming and rockfall initiation is intuitive and supported by field and lab observations, the physical processes behind it are still poorly understood. In this study, we focus on the role of hydrologic and thermo-mechanical processes acting in fractures of steep alpine bedrock permafrost. Key challenges of the model scheme are related to the quantification of snow meltwater available for infiltration at different time scales. We combine field observations from a high elevation Alpine site in the Mont-Blanc massif (the Aiguille du Midi, 3842 m a.s.l) with numerical models of surface heat balance and mass transport. We were able to simulate snowmelt between 1959-2020 using the SAFRAN S2M dataset and show that annual snowmelt vary between 0.1-0.4 m/year and that its infiltration potential is limited by the accumulation of an ice crust in the rock-snow interface. Progress on these issues will help us decipher the governing processes in the degradation of high mountain permafrost and its link with rockfall occurrence. |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) University of Oslo (UiO) 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 |
author |
Ben-Asher, Matan Magnin, Florence Bock, Josué Josnin, Jean-Yves Westermann, Sebastian Ravanel, Ludovic Deline, Philip |
author_facet |
Ben-Asher, Matan Magnin, Florence Bock, Josué Josnin, Jean-Yves Westermann, Sebastian Ravanel, Ludovic Deline, Philip |
author_sort |
Ben-Asher, Matan |
title |
Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls |
title_short |
Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls |
title_full |
Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls |
title_fullStr |
Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls |
title_full_unstemmed |
Hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls |
title_sort |
hydrological processes and thermal dynamics in high mountain permafrost-affected rock walls |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03886203 https://hal.science/hal-03886203/document https://hal.science/hal-03886203/file/PRF2022_poster_BenAsher.pdf |
op_coverage |
Flatrock, United States |
long_lat |
ENVELOPE(-120.283,-120.283,56.267,56.267) ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Flatrock Mont Blanc |
geographic_facet |
Flatrock Mont Blanc |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
PRF2022 https://hal.science/hal-03886203 PRF2022, Jun 2022, Flatrock, United States. https://www.prf2022.org/ |
op_relation |
hal-03886203 https://hal.science/hal-03886203 https://hal.science/hal-03886203/document https://hal.science/hal-03886203/file/PRF2022_poster_BenAsher.pdf |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
_version_ |
1790601354931077120 |