An analysis of instabilities and limit cycles in glacier-dammed reservoirs
Glacier lake outburst floods are common glacial hazards around the world. How big such floods can become (either in terms of peak discharge or in terms of total volume released) depends on how they are initiated: what causes the runaway enlargement of a subglacial or other conduit to start the flood...
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00053169 2023-05-15T18:32:33+02:00 An analysis of instabilities and limit cycles in glacier-dammed reservoirs Schoof, Christian 2020-09 electronic https://doi.org/10.5194/tc-14-3175-2020 https://noa.gwlb.de/receive/cop_mods_00053169 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052822/tc-14-3175-2020.pdf https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-3175-2020 https://noa.gwlb.de/receive/cop_mods_00053169 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052822/tc-14-3175-2020.pdf https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/tc-14-3175-2020 2022-02-08T22:35:36Z Glacier lake outburst floods are common glacial hazards around the world. How big such floods can become (either in terms of peak discharge or in terms of total volume released) depends on how they are initiated: what causes the runaway enlargement of a subglacial or other conduit to start the flood, and how big can the lake get before that point is reached? Here we investigate how the spontaneous channelization of a linked-cavity drainage system can control the onset of floods. In agreement with previous work, we show that floods only occur in a band of water throughput rates in which steady reservoir drainage is unstable, and we identify stabilizing mechanisms that allow steady drainage of an ice-dammed reservoir. We also show how stable limit cycle solutions emerge from the instability and identify parameter regimes in which the resulting floods cause flotation of the ice dam. These floods are likely to be initiated by flotation rather than the unstable enlargement of a distributed drainage system. Article in Journal/Newspaper The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 14 9 3175 3194 |
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English |
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article Verlagsveröffentlichung Schoof, Christian An analysis of instabilities and limit cycles in glacier-dammed reservoirs |
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article Verlagsveröffentlichung |
description |
Glacier lake outburst floods are common glacial hazards around the world. How big such floods can become (either in terms of peak discharge or in terms of total volume released) depends on how they are initiated: what causes the runaway enlargement of a subglacial or other conduit to start the flood, and how big can the lake get before that point is reached? Here we investigate how the spontaneous channelization of a linked-cavity drainage system can control the onset of floods. In agreement with previous work, we show that floods only occur in a band of water throughput rates in which steady reservoir drainage is unstable, and we identify stabilizing mechanisms that allow steady drainage of an ice-dammed reservoir. We also show how stable limit cycle solutions emerge from the instability and identify parameter regimes in which the resulting floods cause flotation of the ice dam. These floods are likely to be initiated by flotation rather than the unstable enlargement of a distributed drainage system. |
format |
Article in Journal/Newspaper |
author |
Schoof, Christian |
author_facet |
Schoof, Christian |
author_sort |
Schoof, Christian |
title |
An analysis of instabilities and limit cycles in glacier-dammed reservoirs |
title_short |
An analysis of instabilities and limit cycles in glacier-dammed reservoirs |
title_full |
An analysis of instabilities and limit cycles in glacier-dammed reservoirs |
title_fullStr |
An analysis of instabilities and limit cycles in glacier-dammed reservoirs |
title_full_unstemmed |
An analysis of instabilities and limit cycles in glacier-dammed reservoirs |
title_sort |
analysis of instabilities and limit cycles in glacier-dammed reservoirs |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-3175-2020 https://noa.gwlb.de/receive/cop_mods_00053169 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052822/tc-14-3175-2020.pdf https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-3175-2020 https://noa.gwlb.de/receive/cop_mods_00053169 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052822/tc-14-3175-2020.pdf https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-14-3175-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
9 |
container_start_page |
3175 |
op_container_end_page |
3194 |
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1766216741363384320 |