Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation
We present results of full-scale physical modelling of solifluction in two thermally defined environments: (a) seasonal frost penetration but no permafrost, and (b) a seasonally thawed active layer above cold permafrost. Modelling was undertaken at the Laboratoire M2C, Universit de Caen-Basse Norman...
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ftunivsussexfig:oai:figshare.com:article/23321309 2023-06-18T03:41:05+02:00 Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation Charles Harris Martina Kern-Luetschg Julian Murton Marianne Font Michael Davies Fraser Smith 2008-10-01T00:00:00Z https://figshare.com/articles/journal_contribution/Solifluction_processes_on_permafrost_and_non-permafrost_slopes_results_of_a_large-scale_laboratory_simulation/23321309 unknown 10779/uos.23321309.v1 https://figshare.com/articles/journal_contribution/Solifluction_processes_on_permafrost_and_non-permafrost_slopes_results_of_a_large-scale_laboratory_simulation/23321309 Copyright not evaluated Uncategorised value Text Journal contribution 2008 ftunivsussexfig 2023-06-07T23:30:32Z We present results of full-scale physical modelling of solifluction in two thermally defined environments: (a) seasonal frost penetration but no permafrost, and (b) a seasonally thawed active layer above cold permafrost. Modelling was undertaken at the Laboratoire M2C, Universit de Caen-Basse Normandie, Centre National de la Recherche Scientifique, France. Two geometrically similar slope models were constructed using natural frost-susceptible test soil. In Model 1 water was supplied via a basal sand layer during freezing. In Model 2 the basal sand layer contained refrigerated copper tubing that maintained a permafrost table. Soil freezing was from the top down in Model 1 (one-sided freezing) but from the top down and bottom up (two-sided freezing) in Model 2. Thawing occurred from the top down as a result of positive air temperatures. Ice segregation in Model 1 decreased with depth, but in Model 2, simulated rainfall led to summer frost heave associated with ice segregation at the permafrost table, and subsequent two-sided freezing increased basal ice contents further. Thaw consolidation in Model 1 decreased with depth, but in Model 2 was greatest in the ice-rich basal layer. Soil shear strain occurred during thaw consolidation and was accompanied by raised pore water pressures. Displacement profiles showed decreasing movement rates with depth in Model 1 (one-sided freezing) but `plug-like displacements of the active layer over a shearing basal zone in Model 2 (two-sided active layer freezing). Volumetric transport rates were approximately 2.8 times higher for a given rate of surface movement in the permafrost model compared with the non-permafrost model. Article in Journal/Newspaper Ice permafrost University of Sussex: Figshare |
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University of Sussex: Figshare |
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Uncategorised value Charles Harris Martina Kern-Luetschg Julian Murton Marianne Font Michael Davies Fraser Smith Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
topic_facet |
Uncategorised value |
description |
We present results of full-scale physical modelling of solifluction in two thermally defined environments: (a) seasonal frost penetration but no permafrost, and (b) a seasonally thawed active layer above cold permafrost. Modelling was undertaken at the Laboratoire M2C, Universit de Caen-Basse Normandie, Centre National de la Recherche Scientifique, France. Two geometrically similar slope models were constructed using natural frost-susceptible test soil. In Model 1 water was supplied via a basal sand layer during freezing. In Model 2 the basal sand layer contained refrigerated copper tubing that maintained a permafrost table. Soil freezing was from the top down in Model 1 (one-sided freezing) but from the top down and bottom up (two-sided freezing) in Model 2. Thawing occurred from the top down as a result of positive air temperatures. Ice segregation in Model 1 decreased with depth, but in Model 2, simulated rainfall led to summer frost heave associated with ice segregation at the permafrost table, and subsequent two-sided freezing increased basal ice contents further. Thaw consolidation in Model 1 decreased with depth, but in Model 2 was greatest in the ice-rich basal layer. Soil shear strain occurred during thaw consolidation and was accompanied by raised pore water pressures. Displacement profiles showed decreasing movement rates with depth in Model 1 (one-sided freezing) but `plug-like displacements of the active layer over a shearing basal zone in Model 2 (two-sided active layer freezing). Volumetric transport rates were approximately 2.8 times higher for a given rate of surface movement in the permafrost model compared with the non-permafrost model. |
format |
Article in Journal/Newspaper |
author |
Charles Harris Martina Kern-Luetschg Julian Murton Marianne Font Michael Davies Fraser Smith |
author_facet |
Charles Harris Martina Kern-Luetschg Julian Murton Marianne Font Michael Davies Fraser Smith |
author_sort |
Charles Harris |
title |
Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
title_short |
Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
title_full |
Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
title_fullStr |
Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
title_full_unstemmed |
Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
title_sort |
solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
publishDate |
2008 |
url |
https://figshare.com/articles/journal_contribution/Solifluction_processes_on_permafrost_and_non-permafrost_slopes_results_of_a_large-scale_laboratory_simulation/23321309 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
10779/uos.23321309.v1 https://figshare.com/articles/journal_contribution/Solifluction_processes_on_permafrost_and_non-permafrost_slopes_results_of_a_large-scale_laboratory_simulation/23321309 |
op_rights |
Copyright not evaluated |
_version_ |
1769006506395566080 |