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dc.contributor.author
Sugiyama, Shin
dc.contributor.author
Gudmundsson, Gudmundur H.
dc.date.accessioned
2022-02-17T10:32:37Z
dc.date.available
2017-06-09T10:10:14Z
dc.date.available
2019-11-14T11:46:48Z
dc.date.available
2022-02-17T10:32:37Z
dc.date.issued
2004
dc.identifier.issn
0022-1430
dc.identifier.issn
1727-5652
dc.identifier.other
10.3189/172756504781829846
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/32370
dc.description.abstract
Short-term variations in horizontal and vertical surface motion were studied with high temporal resolution during the ablation season in Lauteraargletscher, Bernese Alps, Switzerland. Horizontal surface flow speed oscillated diurnally, showing a correlation with the water level in a borehole. Flow speed increased as a function of the water level, with an asymptote at the ice overburden level. This observation implied that the flow variations were principally controlled by the local water pressure which enhanced basal motions. Detailed examination of the diurnal variations, however, showed that the speed was larger when the pressure was increasing than when it was decreasing. Greater speed with increasing pressure was interpreted by subglacial water-cavity opening and/or longitudinal stress coupling with the upper reaches of the glacier. Upward surface movements were observed when the glacier flow speed increased. Simultaneous measurement of internal vertical strain in a borehole showed that the uplift had two different sources: vertical straining of ice and volume increase of subglacial water cavities. The vertical surface movement was largely affected by the vertical strain, and the uplift events could not be simply attributed to cavity opening.
en_US
dc.language.iso
en
en_US
dc.publisher
International Glaciological Society
en_US
dc.title
Short-term variations in glacier flow controlled by subglacial water pressure at Lauteraargletscher, Bernese Alps, Switzerland
en_US
dc.type
Journal Article
ethz.journal.title
Journal of Glaciology
ethz.journal.volume
50
en_US
ethz.journal.issue
170
en_US
ethz.journal.abbreviated
J Glaciol
ethz.pages.start
353
en_US
ethz.pages.end
362
en_US
ethz.identifier.wos
ethz.publication.place
Cambridge
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
03504 - Minor, Hans-Erwin
en_US
ethz.leitzahl.certified
03504 - Minor, Hans-Erwin
ethz.date.deposited
2017-06-09T10:10:17Z
ethz.source
ECIT
ethz.identifier.importid
imp59364dd37d44c39018
ethz.ecitpid
pub:52921
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2017-07-26T14:48:18Z
ethz.rosetta.lastUpdated
2022-03-29T18:56:06Z
ethz.rosetta.versionExported
true
ethz.COinS
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