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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ftccsdartic:oai:HAL:hal-03065348v2 2023-05-15T15:04:20+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) Melnikov Permafrost Institut Russian Academy of Sciences Moscow (RAS) 2021 https://hal.archives-ouvertes.fr/hal-03065348 https://hal.archives-ouvertes.fr/hal-03065348v2/document https://hal.archives-ouvertes.fr/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf en eng HAL CCSD American Geophysical Union hal-03065348 https://hal.archives-ouvertes.fr/hal-03065348 https://hal.archives-ouvertes.fr/hal-03065348v2/document https://hal.archives-ouvertes.fr/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03065348 Geophysical Research Letters, American Geophysical Union, 2021 [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2021 ftccsdartic 2022-01-09T00:04:15Z 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* Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.MCG]Environmental Sciences/Global Changes 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 |
topic_facet |
[SDE.MCG]Environmental Sciences/Global Changes |
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) Melnikov Permafrost Institut Russian Academy of Sciences Moscow (RAS) |
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 |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03065348 https://hal.archives-ouvertes.fr/hal-03065348v2/document https://hal.archives-ouvertes.fr/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst wedge* |
genre_facet |
Arctic Ice permafrost Thermokarst wedge* |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03065348 Geophysical Research Letters, American Geophysical Union, 2021 |
op_relation |
hal-03065348 https://hal.archives-ouvertes.fr/hal-03065348 https://hal.archives-ouvertes.fr/hal-03065348v2/document https://hal.archives-ouvertes.fr/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766336123390394368 |