Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada
Dozens of fresh active‐layer detachments were observed on the Fosheim Peninsula in late‐summer 2005 following one week of high air temperatures and nearly continuous bright sunshine. One of these shallow translational landslides started as a minor movement on an upper, steeper slope segment but over...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.578 |
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ftrepec:oai:RePEc:wly:perpro:v:18:y:2007:i:1:p:89-103 2023-05-15T16:05:56+02:00 Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada Antoni G. Lewkowicz https://doi.org/10.1002/ppp.578 unknown https://doi.org/10.1002/ppp.578 article ftrepec https://doi.org/10.1002/ppp.578 2020-12-04T13:31:03Z Dozens of fresh active‐layer detachments were observed on the Fosheim Peninsula in late‐summer 2005 following one week of high air temperatures and nearly continuous bright sunshine. One of these shallow translational landslides started as a minor movement on an upper, steeper slope segment but over several days its front propagated 250 m downslope at velocities of 2–9 m h−1. A second, smaller active‐layer detachment developed within less than 2 hours and subsequent movement was limited. Effective stress analyses can explain the initiation of these landslides on moderate gradients. Movements across extremely low‐angled slope segments, however, likely require both dynamic loading from the moving mass and very low basal undrained shear strengths produced by high porewater pressures. The lengthy development of the large active‐layer detachment helps explain stratigraphic and morphologic features previously observed in these slope failures. Copyright © 2007 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ellesmere Island Fosheim Peninsula Nunavut RePEc (Research Papers in Economics) Canada Ellesmere Island Fosheim Peninsula ENVELOPE(-83.749,-83.749,79.669,79.669) Nunavut Permafrost and Periglacial Processes 18 1 89 103 |
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Open Polar |
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RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
Dozens of fresh active‐layer detachments were observed on the Fosheim Peninsula in late‐summer 2005 following one week of high air temperatures and nearly continuous bright sunshine. One of these shallow translational landslides started as a minor movement on an upper, steeper slope segment but over several days its front propagated 250 m downslope at velocities of 2–9 m h−1. A second, smaller active‐layer detachment developed within less than 2 hours and subsequent movement was limited. Effective stress analyses can explain the initiation of these landslides on moderate gradients. Movements across extremely low‐angled slope segments, however, likely require both dynamic loading from the moving mass and very low basal undrained shear strengths produced by high porewater pressures. The lengthy development of the large active‐layer detachment helps explain stratigraphic and morphologic features previously observed in these slope failures. Copyright © 2007 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Antoni G. Lewkowicz |
spellingShingle |
Antoni G. Lewkowicz Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
author_facet |
Antoni G. Lewkowicz |
author_sort |
Antoni G. Lewkowicz |
title |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_short |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_full |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_fullStr |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_full_unstemmed |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_sort |
dynamics of active‐layer detachment failures, fosheim peninsula, ellesmere island, nunavut, canada |
url |
https://doi.org/10.1002/ppp.578 |
long_lat |
ENVELOPE(-83.749,-83.749,79.669,79.669) |
geographic |
Canada Ellesmere Island Fosheim Peninsula Nunavut |
geographic_facet |
Canada Ellesmere Island Fosheim Peninsula Nunavut |
genre |
Ellesmere Island Fosheim Peninsula Nunavut |
genre_facet |
Ellesmere Island Fosheim Peninsula Nunavut |
op_relation |
https://doi.org/10.1002/ppp.578 |
op_doi |
https://doi.org/10.1002/ppp.578 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
18 |
container_issue |
1 |
container_start_page |
89 |
op_container_end_page |
103 |
_version_ |
1766401855019024384 |