The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland
Abstract. As consequence of ongoing climate change, permafrost degradation is thought to be increasingly affecting slope stability in periglacial environments. This is of growing concern in Iceland, where in the last decade permafrost degradation has been identified among the triggering factors of l...
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ftloughboroughun:oai:figshare.com:article/14345726 2023-05-15T16:36:46+02:00 The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland C Morino SJ Conway MR Balme JK Helgason Þ Sæmundsson C Jordan John Hillier T Argles 2021-05-04T00:00:00Z https://figshare.com/articles/journal_contribution/The_impact_of_ground-ice_thaw_on_landslide_geomorphology_and_dynamics_two_case_studies_in_northern_Iceland/14345726 unknown 2134/14345726.v1 https://figshare.com/articles/journal_contribution/The_impact_of_ground-ice_thaw_on_landslide_geomorphology_and_dynamics_two_case_studies_in_northern_Iceland/14345726 CC BY 4.0 CC-BY Uncategorized Strategic Defence & Security Studies Physical Geography and Environmental Geoscience Civil Engineering risk Iceland ground ice permafrost Landslides Text Journal contribution 2021 ftloughboroughun 2022-01-01T19:07:57Z Abstract. As consequence of ongoing climate change, permafrost degradation is thought to be increasingly affecting slope stability in periglacial environments. This is of growing concern in Iceland, where in the last decade permafrost degradation has been identified among the triggering factors of landslides. The role of ground ice in conditioning the morphology and dynamics of landslides involving loose deposits is poorly understood. We show the geomorphological impact of the Móafellshyrna and Árnesfjall landslides that recently occurred in ice-cemented talus deposits in northern Iceland. Using field and aerial remote sensing measurements of the morphological and morphometric characteristics of the landslides, we assess the influence of thawing ground ice on their propagation style and dynamics. The two mass movements are complex and are similar to rock- and debris-ice avalanches, changing trajectory and exhibiting evidence of transitioning their style of motion from a dry granular mass to a debris flow-like movement via multiple pulses. We infer that the thawing of ground ice together with the entrainment of saturated material provided the extra fluid causing this change in dynamics. The hazardous 2 consequences of permafrost degradation will increasingly affect mountain regions in the future, and ground-ice thaw in steep terrain is a particularly hazardous phenomenon, as it may induce unexpected long-runout failures and can cause slope instability to continue even after the landslide event. Our study expands our knowledge of how landslides develop in unstable ice-cemented deposits, and will aid assessment and mitigation of the hazard that they pose in Iceland and other mountainous periglacial areas. Other Non-Article Part of Journal/Newspaper Ice Iceland permafrost Loughborough University: Figshare Árnesfjall ENVELOPE(-21.576,-21.576,66.002,66.002) |
institution |
Open Polar |
collection |
Loughborough University: Figshare |
op_collection_id |
ftloughboroughun |
language |
unknown |
topic |
Uncategorized Strategic Defence & Security Studies Physical Geography and Environmental Geoscience Civil Engineering risk Iceland ground ice permafrost Landslides |
spellingShingle |
Uncategorized Strategic Defence & Security Studies Physical Geography and Environmental Geoscience Civil Engineering risk Iceland ground ice permafrost Landslides C Morino SJ Conway MR Balme JK Helgason Þ Sæmundsson C Jordan John Hillier T Argles The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland |
topic_facet |
Uncategorized Strategic Defence & Security Studies Physical Geography and Environmental Geoscience Civil Engineering risk Iceland ground ice permafrost Landslides |
description |
Abstract. As consequence of ongoing climate change, permafrost degradation is thought to be increasingly affecting slope stability in periglacial environments. This is of growing concern in Iceland, where in the last decade permafrost degradation has been identified among the triggering factors of landslides. The role of ground ice in conditioning the morphology and dynamics of landslides involving loose deposits is poorly understood. We show the geomorphological impact of the Móafellshyrna and Árnesfjall landslides that recently occurred in ice-cemented talus deposits in northern Iceland. Using field and aerial remote sensing measurements of the morphological and morphometric characteristics of the landslides, we assess the influence of thawing ground ice on their propagation style and dynamics. The two mass movements are complex and are similar to rock- and debris-ice avalanches, changing trajectory and exhibiting evidence of transitioning their style of motion from a dry granular mass to a debris flow-like movement via multiple pulses. We infer that the thawing of ground ice together with the entrainment of saturated material provided the extra fluid causing this change in dynamics. The hazardous 2 consequences of permafrost degradation will increasingly affect mountain regions in the future, and ground-ice thaw in steep terrain is a particularly hazardous phenomenon, as it may induce unexpected long-runout failures and can cause slope instability to continue even after the landslide event. Our study expands our knowledge of how landslides develop in unstable ice-cemented deposits, and will aid assessment and mitigation of the hazard that they pose in Iceland and other mountainous periglacial areas. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
C Morino SJ Conway MR Balme JK Helgason Þ Sæmundsson C Jordan John Hillier T Argles |
author_facet |
C Morino SJ Conway MR Balme JK Helgason Þ Sæmundsson C Jordan John Hillier T Argles |
author_sort |
C Morino |
title |
The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland |
title_short |
The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland |
title_full |
The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland |
title_fullStr |
The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland |
title_full_unstemmed |
The impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern Iceland |
title_sort |
impact of ground-ice thaw on landslide geomorphology and dynamics: two case studies in northern iceland |
publishDate |
2021 |
url |
https://figshare.com/articles/journal_contribution/The_impact_of_ground-ice_thaw_on_landslide_geomorphology_and_dynamics_two_case_studies_in_northern_Iceland/14345726 |
long_lat |
ENVELOPE(-21.576,-21.576,66.002,66.002) |
geographic |
Árnesfjall |
geographic_facet |
Árnesfjall |
genre |
Ice Iceland permafrost |
genre_facet |
Ice Iceland permafrost |
op_relation |
2134/14345726.v1 https://figshare.com/articles/journal_contribution/The_impact_of_ground-ice_thaw_on_landslide_geomorphology_and_dynamics_two_case_studies_in_northern_Iceland/14345726 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
_version_ |
1766027086595620864 |