Effects of rock avalanches on glacier behaviour and moraine formation
Although large rock avalanches are infrequent, sediment production in active orogens is dominated by such events, which may strongly influence geomorphic processes. Where rock avalanches fall onto glaciers, they may affect glacier behaviour and moraine formation. We outline the processes of rock ava...
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Format: | Article in Journal/Newspaper |
Language: | English |
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2011
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Online Access: | https://espace.library.uq.edu.au/view/UQ:247025 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:247025 2023-05-15T16:22:27+02:00 Effects of rock avalanches on glacier behaviour and moraine formation Reznichenko, Natalya V. Davies, Tim R. H. Alexander, David J. 2011-09-15 https://espace.library.uq.edu.au/view/UQ:247025 eng eng Elsevier doi:10.1016/j.geomorph.2011.05.019 issn:0169-555X issn:1872-695X Rock avalanches Supraglacial debris Ice-surface ablation Glacier advances Terminal moraines Paleoclimatology and hazards Central Southern Alps New-Zealand Debris layer Karakoram Himalaya Climate-change Catastrophic landslides Balance model Denali fault Earthquake Canada 1904 Earth-Surface Processes Journal Article 2011 ftunivqespace https://doi.org/10.1016/j.geomorph.2011.05.019 2020-10-27T01:02:17Z Although large rock avalanches are infrequent, sediment production in active orogens is dominated by such events, which may strongly influence geomorphic processes. Where rock avalanches fall onto glaciers, they may affect glacier behaviour and moraine formation. We outline the processes of rock avalanche initiation and motion, and show that supraglacial deposits of rock avalanche debris have distinct sedimentological and thermal properties. Laboratory experiments on the effects of such debris on ice ablation are supplemented by field data from two rock avalanches in the Southern Alps, New Zealand. Their effects are compared with those of the thinner supraglacial debris that results from small rockfalls and melt-out of englacial debris. Implications of rock-avalanche debris cover for glacier behaviour are explored using a mass-balance model of the Franz Josef Glacier in New Zealand, demonstrating a likely supraglacial rock avalanche origin for the Waiho Loop moraine, and considering the potential hazard of a large rock avalanche onto the present-day glacier. Article in Journal/Newspaper glacier* The University of Queensland: UQ eSpace Canada New Zealand Geomorphology 132 3-4 327 338 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Rock avalanches Supraglacial debris Ice-surface ablation Glacier advances Terminal moraines Paleoclimatology and hazards Central Southern Alps New-Zealand Debris layer Karakoram Himalaya Climate-change Catastrophic landslides Balance model Denali fault Earthquake Canada 1904 Earth-Surface Processes |
spellingShingle |
Rock avalanches Supraglacial debris Ice-surface ablation Glacier advances Terminal moraines Paleoclimatology and hazards Central Southern Alps New-Zealand Debris layer Karakoram Himalaya Climate-change Catastrophic landslides Balance model Denali fault Earthquake Canada 1904 Earth-Surface Processes Reznichenko, Natalya V. Davies, Tim R. H. Alexander, David J. Effects of rock avalanches on glacier behaviour and moraine formation |
topic_facet |
Rock avalanches Supraglacial debris Ice-surface ablation Glacier advances Terminal moraines Paleoclimatology and hazards Central Southern Alps New-Zealand Debris layer Karakoram Himalaya Climate-change Catastrophic landslides Balance model Denali fault Earthquake Canada 1904 Earth-Surface Processes |
description |
Although large rock avalanches are infrequent, sediment production in active orogens is dominated by such events, which may strongly influence geomorphic processes. Where rock avalanches fall onto glaciers, they may affect glacier behaviour and moraine formation. We outline the processes of rock avalanche initiation and motion, and show that supraglacial deposits of rock avalanche debris have distinct sedimentological and thermal properties. Laboratory experiments on the effects of such debris on ice ablation are supplemented by field data from two rock avalanches in the Southern Alps, New Zealand. Their effects are compared with those of the thinner supraglacial debris that results from small rockfalls and melt-out of englacial debris. Implications of rock-avalanche debris cover for glacier behaviour are explored using a mass-balance model of the Franz Josef Glacier in New Zealand, demonstrating a likely supraglacial rock avalanche origin for the Waiho Loop moraine, and considering the potential hazard of a large rock avalanche onto the present-day glacier. |
format |
Article in Journal/Newspaper |
author |
Reznichenko, Natalya V. Davies, Tim R. H. Alexander, David J. |
author_facet |
Reznichenko, Natalya V. Davies, Tim R. H. Alexander, David J. |
author_sort |
Reznichenko, Natalya V. |
title |
Effects of rock avalanches on glacier behaviour and moraine formation |
title_short |
Effects of rock avalanches on glacier behaviour and moraine formation |
title_full |
Effects of rock avalanches on glacier behaviour and moraine formation |
title_fullStr |
Effects of rock avalanches on glacier behaviour and moraine formation |
title_full_unstemmed |
Effects of rock avalanches on glacier behaviour and moraine formation |
title_sort |
effects of rock avalanches on glacier behaviour and moraine formation |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://espace.library.uq.edu.au/view/UQ:247025 |
geographic |
Canada New Zealand |
geographic_facet |
Canada New Zealand |
genre |
glacier* |
genre_facet |
glacier* |
op_relation |
doi:10.1016/j.geomorph.2011.05.019 issn:0169-555X issn:1872-695X |
op_doi |
https://doi.org/10.1016/j.geomorph.2011.05.019 |
container_title |
Geomorphology |
container_volume |
132 |
container_issue |
3-4 |
container_start_page |
327 |
op_container_end_page |
338 |
_version_ |
1766010433533116416 |