Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps
Abstract Active and inactive rock glaciers differ from relict rock glaciers in the presence of subsurface permafrost, as indicated by high seismic velocity, high DC resistivity and low bottom temperature of the winter snow cover. The lack of vegetation on the frontal slope and negative mean annual s...
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crwiley:10.1002/ppp.413 2024-09-15T18:11:26+00:00 Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps Ikeda, Atsushi Matsuoka, Norikazu 2002 http://dx.doi.org/10.1002/ppp.413 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.413 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.413 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 13, issue 2, page 145-161 ISSN 1045-6740 1099-1530 journal-article 2002 crwiley https://doi.org/10.1002/ppp.413 2024-08-22T04:17:47Z Abstract Active and inactive rock glaciers differ from relict rock glaciers in the presence of subsurface permafrost, as indicated by high seismic velocity, high DC resistivity and low bottom temperature of the winter snow cover. The lack of vegetation on the frontal slope and negative mean annual surface temperatures (MAST) distinguish active rock glaciers from inactive rock glaciers. Increasing MAST induces melting of ice‐rich permafrost, which is followed by the subsidence of rock glaciers. As a result, convex‐up transverse profiles are replaced by flat or depressed profiles. Permafrost degradation inactivates rock glaciers by decreasing shear stress, within or at the base of the deforming ice/rock mixture, causing stabilization and declination of the frontal slope. Relict rock glaciers are usually associated with soil development over the surficial clasts, which is responsible for further declination of the frontal slope and a more rounded topography. Copyright © 2002 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice permafrost Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 13 2 145 161 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Active and inactive rock glaciers differ from relict rock glaciers in the presence of subsurface permafrost, as indicated by high seismic velocity, high DC resistivity and low bottom temperature of the winter snow cover. The lack of vegetation on the frontal slope and negative mean annual surface temperatures (MAST) distinguish active rock glaciers from inactive rock glaciers. Increasing MAST induces melting of ice‐rich permafrost, which is followed by the subsidence of rock glaciers. As a result, convex‐up transverse profiles are replaced by flat or depressed profiles. Permafrost degradation inactivates rock glaciers by decreasing shear stress, within or at the base of the deforming ice/rock mixture, causing stabilization and declination of the frontal slope. Relict rock glaciers are usually associated with soil development over the surficial clasts, which is responsible for further declination of the frontal slope and a more rounded topography. Copyright © 2002 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Ikeda, Atsushi Matsuoka, Norikazu |
spellingShingle |
Ikeda, Atsushi Matsuoka, Norikazu Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps |
author_facet |
Ikeda, Atsushi Matsuoka, Norikazu |
author_sort |
Ikeda, Atsushi |
title |
Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps |
title_short |
Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps |
title_full |
Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps |
title_fullStr |
Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps |
title_full_unstemmed |
Degradation of talus‐derived rock glaciers in the Upper Engadin, Swiss Alps |
title_sort |
degradation of talus‐derived rock glaciers in the upper engadin, swiss alps |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1002/ppp.413 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.413 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.413 |
genre |
Ice permafrost Permafrost and Periglacial Processes |
genre_facet |
Ice permafrost Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 13, issue 2, page 145-161 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.413 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
13 |
container_issue |
2 |
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145 |
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161 |
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1810449034517676032 |