The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland
Gornergletscher, Switzerland, is located adjacent to the marginal lake Gornersee, which periodically drains. We measured glacier ice-flow velocities during two drainage events of the lake, in 2004 and 2006. The common feature of these events was that, during both, Gornersee filled to its maximum lev...
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Online Access: | http://hdl.handle.net/2115/49862 https://doi.org/10.3189/002214310791968575 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/49862 2023-05-15T16:57:25+02:00 The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland Riesen, Patrick Sugiyama, Shin Funk, Martin http://hdl.handle.net/2115/49862 https://doi.org/10.3189/002214310791968575 eng eng International Glaciological Society http://www.igsoc.org/ http://hdl.handle.net/2115/49862 Journal of Glaciology, 56(196): 278-286 http://dx.doi.org/10.3189/002214310791968575 © 2010 International Glaciological Society 452 article fthokunivhus https://doi.org/10.3189/002214310791968575 2022-11-18T01:02:28Z Gornergletscher, Switzerland, is located adjacent to the marginal lake Gornersee, which periodically drains. We measured glacier ice-flow velocities during two drainage events of the lake, in 2004 and 2006. The common feature of these events was that, during both, Gornersee filled to its maximum level and then overflowed. The events differed in that in 2004 Gornersee rapidly drained via a sudden subglacial connection, whereas in 2006 the lake water continued to overflow and slowly discharged into a nearby moulin. We analysed the changes in ice-flow velocities in the vicinity of Gornersee during the two drainage events, using a three-dimensional ice-flow model which is able to (1) simulate locally variable enhanced basal motion of the ice and (2) account for the load and release of water pressure exerted on the ice margin. We demonstrate that the key features of the observed flow changes can be reproduced adequately in the numerical model by considering these two effects as the main mechanisms. We interpret the 2006 flow changes to be dominated by the release of lake water pressure acting on the ice during the lake drainage. The 2004 ice-flow changes can be explained by enhanced basal motion, and the impact of the lake water pressure provides certain clues to some observations insufficiently explained by enhanced basal motion. Article in Journal/Newspaper Journal of Glaciology Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Marginal Lake ENVELOPE(163.500,163.500,-74.600,-74.600) Journal of Glaciology 56 196 278 286 |
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Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
452 |
spellingShingle |
452 Riesen, Patrick Sugiyama, Shin Funk, Martin The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland |
topic_facet |
452 |
description |
Gornergletscher, Switzerland, is located adjacent to the marginal lake Gornersee, which periodically drains. We measured glacier ice-flow velocities during two drainage events of the lake, in 2004 and 2006. The common feature of these events was that, during both, Gornersee filled to its maximum level and then overflowed. The events differed in that in 2004 Gornersee rapidly drained via a sudden subglacial connection, whereas in 2006 the lake water continued to overflow and slowly discharged into a nearby moulin. We analysed the changes in ice-flow velocities in the vicinity of Gornersee during the two drainage events, using a three-dimensional ice-flow model which is able to (1) simulate locally variable enhanced basal motion of the ice and (2) account for the load and release of water pressure exerted on the ice margin. We demonstrate that the key features of the observed flow changes can be reproduced adequately in the numerical model by considering these two effects as the main mechanisms. We interpret the 2006 flow changes to be dominated by the release of lake water pressure acting on the ice during the lake drainage. The 2004 ice-flow changes can be explained by enhanced basal motion, and the impact of the lake water pressure provides certain clues to some observations insufficiently explained by enhanced basal motion. |
format |
Article in Journal/Newspaper |
author |
Riesen, Patrick Sugiyama, Shin Funk, Martin |
author_facet |
Riesen, Patrick Sugiyama, Shin Funk, Martin |
author_sort |
Riesen, Patrick |
title |
The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland |
title_short |
The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland |
title_full |
The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland |
title_fullStr |
The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland |
title_full_unstemmed |
The influence of the presence and drainage of an ice-marginal lake on the flow of Gornergletscher, Switzerland |
title_sort |
influence of the presence and drainage of an ice-marginal lake on the flow of gornergletscher, switzerland |
publisher |
International Glaciological Society |
url |
http://hdl.handle.net/2115/49862 https://doi.org/10.3189/002214310791968575 |
long_lat |
ENVELOPE(163.500,163.500,-74.600,-74.600) |
geographic |
Marginal Lake |
geographic_facet |
Marginal Lake |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_relation |
http://www.igsoc.org/ http://hdl.handle.net/2115/49862 Journal of Glaciology, 56(196): 278-286 http://dx.doi.org/10.3189/002214310791968575 |
op_rights |
© 2010 International Glaciological Society |
op_doi |
https://doi.org/10.3189/002214310791968575 |
container_title |
Journal of Glaciology |
container_volume |
56 |
container_issue |
196 |
container_start_page |
278 |
op_container_end_page |
286 |
_version_ |
1766048964838162432 |