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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Online Access: | https://hal.science/hal-03065348 https://hal.science/hal-03065348v2/document https://hal.science/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf https://doi.org/10.1029/2020GL091070 |
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ftanrparis:oai:HAL:hal-03065348v2 2023-06-11T04:09:28+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) ANR-17-MPGA-0014,PEGS,PErmafrost and Greenhouse gas dynamics in Siberia(2017) 2021 https://hal.science/hal-03065348 https://hal.science/hal-03065348v2/document https://hal.science/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf https://doi.org/10.1029/2020GL091070 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL091070 hal-03065348 https://hal.science/hal-03065348 https://hal.science/hal-03065348v2/document https://hal.science/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf doi:10.1029/2020GL091070 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-03065348 Geophysical Research Letters, 2021, 48 (1), ⟨10.1029/2020GL091070⟩ [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2021 ftanrparis https://doi.org/10.1029/2020GL091070 2023-05-28T21:55:25Z 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* Portail HAL-ANR (Agence Nationale de la Recherche) Arctic Geophysical Research Letters 48 1 |
institution |
Open Polar |
collection |
Portail HAL-ANR (Agence Nationale de la Recherche) |
op_collection_id |
ftanrparis |
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) ANR-17-MPGA-0014,PEGS,PErmafrost and Greenhouse gas dynamics in Siberia(2017) |
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.science/hal-03065348 https://hal.science/hal-03065348v2/document https://hal.science/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf https://doi.org/10.1029/2020GL091070 |
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.science/hal-03065348 Geophysical Research Letters, 2021, 48 (1), ⟨10.1029/2020GL091070⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL091070 hal-03065348 https://hal.science/hal-03065348 https://hal.science/hal-03065348v2/document https://hal.science/hal-03065348v2/file/Costard%20GRL2020%20%281%29.pdf doi:10.1029/2020GL091070 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2020GL091070 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
1 |
_version_ |
1768383363399286784 |