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...
Published in: | The Cryosphere |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2020
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-14-3175-2020 https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf https://doaj.org/article/7725c016e338437180eff580a21a7d7b |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:7725c016e338437180eff580a21a7d7b |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:7725c016e338437180eff580a21a7d7b 2023-05-15T18:32:19+02:00 An analysis of instabilities and limit cycles in glacier-dammed reservoirs C. Schoof 2020-09-01 https://doi.org/10.5194/tc-14-3175-2020 https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf https://doaj.org/article/7725c016e338437180eff580a21a7d7b en eng Copernicus Publications doi:10.5194/tc-14-3175-2020 1994-0416 1994-0424 https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf https://doaj.org/article/7725c016e338437180eff580a21a7d7b undefined The Cryosphere, Vol 14, Pp 3175-3194 (2020) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/10.5194/tc-14-3175-2020 2023-01-22T19:27:19Z 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 Unknown The Cryosphere 14 9 3175 3194 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir C. Schoof An analysis of instabilities and limit cycles in glacier-dammed reservoirs |
topic_facet |
geo envir |
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 |
C. Schoof |
author_facet |
C. Schoof |
author_sort |
C. Schoof |
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://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf https://doaj.org/article/7725c016e338437180eff580a21a7d7b |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 14, Pp 3175-3194 (2020) |
op_relation |
doi:10.5194/tc-14-3175-2020 1994-0416 1994-0424 https://tc.copernicus.org/articles/14/3175/2020/tc-14-3175-2020.pdf https://doaj.org/article/7725c016e338437180eff580a21a7d7b |
op_rights |
undefined |
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 |
_version_ |
1766216420123738112 |