Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation
International audience In the ice-rich permafrost of the Arctic regions, thermokarst erosion on slopes induces the formation of large-scale retrogressive thaw slumps (RTS). They have significant geomorphological, hydrological and biogeochemical impacts on the landscape. Further research is thus need...
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fttriple:oai:gotriple.eu:10670/1.a3fvt8 2023-05-15T15:04:21+02:00 Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation Costard, François Dupeyrat, L Séjourné, A Bouchard, F Fedorov, A Saint- Bézar, B Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2020-01-01 https://hal.archives-ouvertes.fr/hal-03065348/file/Costard%20et%20al%20REVISED_111620.pdf https://hal.archives-ouvertes.fr/hal-03065348 en eng HAL CCSD American Geophysical Union hal-03065348 10670/1.a3fvt8 https://hal.archives-ouvertes.fr/hal-03065348/file/Costard%20et%20al%20REVISED_111620.pdf https://hal.archives-ouvertes.fr/hal-03065348 other Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters Geophysical Research Letters, American Geophysical Union, In press geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple 2023-01-22T17:06:19Z International audience In the ice-rich permafrost of the Arctic regions, thermokarst erosion on slopes induces the formation of large-scale retrogressive thaw slumps (RTS). They have significant geomorphological, hydrological and biogeochemical impacts on the landscape. Further research is thus needed to better understand the respective effect of ice content and permafrost heterogeneities on the dynamics of these erosional features. Here we present results of a full-scale physical modelling of RTS development in a cold room. The experimental setup was designed to simulate and compare two ground-ice settings (ice wedges, icy layers) with the thawing of icepoor permafrost (i.e.,reference model). Our results show that the melting of the icy layers induces a loss of decohesion of the overlapping frozen soil. The heterogeneous frozen soil with ice wedges needs a longer time until degradation, but undergoes a stronger and faster decohesion of its structure during the thawing phase. Article in Journal/Newspaper Arctic Ice permafrost Thermokarst wedge* Unknown Arctic |
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geo envir Costard, François Dupeyrat, L Séjourné, A Bouchard, F Fedorov, A Saint- Bézar, B Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation |
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geo envir |
description |
International audience In the ice-rich permafrost of the Arctic regions, thermokarst erosion on slopes induces the formation of large-scale retrogressive thaw slumps (RTS). They have significant geomorphological, hydrological and biogeochemical impacts on the landscape. Further research is thus needed to better understand the respective effect of ice content and permafrost heterogeneities on the dynamics of these erosional features. Here we present results of a full-scale physical modelling of RTS development in a cold room. The experimental setup was designed to simulate and compare two ground-ice settings (ice wedges, icy layers) with the thawing of icepoor permafrost (i.e.,reference model). Our results show that the melting of the icy layers induces a loss of decohesion of the overlapping frozen soil. The heterogeneous frozen soil with ice wedges needs a longer time until degradation, but undergoes a stronger and faster decohesion of its structure during the thawing phase. |
author2 |
Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Costard, François Dupeyrat, L Séjourné, A Bouchard, F Fedorov, A Saint- Bézar, B |
author_facet |
Costard, François Dupeyrat, L Séjourné, A Bouchard, F Fedorov, A Saint- Bézar, B |
author_sort |
Costard, François |
title |
Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation |
title_short |
Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation |
title_full |
Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation |
title_fullStr |
Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation |
title_full_unstemmed |
Retrogressive thaw slumps on ice-rich permafrost under degradation: Results from a large-scale laboratory simulation |
title_sort |
retrogressive thaw slumps on ice-rich permafrost under degradation: results from a large-scale laboratory simulation |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-03065348/file/Costard%20et%20al%20REVISED_111620.pdf https://hal.archives-ouvertes.fr/hal-03065348 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst wedge* |
genre_facet |
Arctic Ice permafrost Thermokarst wedge* |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters Geophysical Research Letters, American Geophysical Union, In press |
op_relation |
hal-03065348 10670/1.a3fvt8 https://hal.archives-ouvertes.fr/hal-03065348/file/Costard%20et%20al%20REVISED_111620.pdf https://hal.archives-ouvertes.fr/hal-03065348 |
op_rights |
other |
_version_ |
1766336142896005120 |