Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation
International audience 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, Univers...
Published in: | Permafrost and Periglacial Processes |
---|---|
Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.science/hal-00358737 https://doi.org/10.1002/ppp.630 |
id |
ftnormandieuniv:oai:HAL:hal-00358737v1 |
---|---|
record_format |
openpolar |
spelling |
ftnormandieuniv:oai:HAL:hal-00358737v1 2024-04-14T08:12:54+00:00 Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation Harris, C. Kem-Luetschg, M. Murton, J. Font, Marianne Davies, M., E. Smith, F. School of Earth and Ocean Sciences Cardiff Cardiff University Department of Geography Brighton University of Sussex Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) Faculty of Engineering University of Engineering School of Engineering University of Dundee 2008-11-27 https://hal.science/hal-00358737 https://doi.org/10.1002/ppp.630 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/ppp.630 hal-00358737 https://hal.science/hal-00358737 doi:10.1002/ppp.630 ISSN: 1045-6740 EISSN: 1099-1530 Permafrost and Periglacial Processes https://hal.science/hal-00358737 Permafrost and Periglacial Processes, 2008, 19 (4), pp.359-378. ⟨10.1002/ppp.630⟩ solifluction • physical modelling • permafrost • seasonally frozen ground [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2008 ftnormandieuniv https://doi.org/10.1002/ppp.630 2024-03-21T16:40:21Z International audience 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, Université 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. Copyright © 2008 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice permafrost Permafrost and Periglacial Processes Normandie Université: HAL Permafrost and Periglacial Processes 19 4 359 378 |
institution |
Open Polar |
collection |
Normandie Université: HAL |
op_collection_id |
ftnormandieuniv |
language |
English |
topic |
solifluction • physical modelling • permafrost • seasonally frozen ground [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
solifluction • physical modelling • permafrost • seasonally frozen ground [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Harris, C. Kem-Luetschg, M. Murton, J. Font, Marianne Davies, M., E. Smith, F. Solifluction processes on permafrost and non-permafrost slopes: results of a large-scale laboratory simulation |
topic_facet |
solifluction • physical modelling • permafrost • seasonally frozen ground [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience 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, Université 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. Copyright © 2008 John Wiley & Sons, Ltd. |
author2 |
School of Earth and Ocean Sciences Cardiff Cardiff University Department of Geography Brighton University of Sussex Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) Faculty of Engineering University of Engineering School of Engineering University of Dundee |
format |
Article in Journal/Newspaper |
author |
Harris, C. Kem-Luetschg, M. Murton, J. Font, Marianne Davies, M., E. Smith, F. |
author_facet |
Harris, C. Kem-Luetschg, M. Murton, J. Font, Marianne Davies, M., E. Smith, F. |
author_sort |
Harris, C. |
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 |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00358737 https://doi.org/10.1002/ppp.630 |
genre |
Ice permafrost Permafrost and Periglacial Processes |
genre_facet |
Ice permafrost Permafrost and Periglacial Processes |
op_source |
ISSN: 1045-6740 EISSN: 1099-1530 Permafrost and Periglacial Processes https://hal.science/hal-00358737 Permafrost and Periglacial Processes, 2008, 19 (4), pp.359-378. ⟨10.1002/ppp.630⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/ppp.630 hal-00358737 https://hal.science/hal-00358737 doi:10.1002/ppp.630 |
op_doi |
https://doi.org/10.1002/ppp.630 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
19 |
container_issue |
4 |
container_start_page |
359 |
op_container_end_page |
378 |
_version_ |
1796310741536473088 |