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dc.contributor.author
Gräff, Dominik
dc.contributor.author
Walter, Fabian
dc.contributor.author
Lipovsky, Bradley P.
dc.date.accessioned
2019-08-20T05:46:51Z
dc.date.available
2019-08-20T05:46:51Z
dc.date.issued
2019-09
dc.identifier.issn
0260-3055
dc.identifier.other
10.1017/aog.2019.8
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/359373
dc.identifier.doi
10.3929/ethz-b-000356785
dc.description.abstract
Hydraulic processes within and beneath glacial bodies exert a far-reaching control on ice flow through their influence on basal sliding. Within the subglacial system, rapid changes in these processes may excite resonances whose interpretation requires an understanding of the underlying wave mechanics. Here, we explore these mechanics using observations from a kHz-sampled pressure sensor installed in a borehole directly above the hard granite bedrock of a temperate mountain glacier in Switzerland. We apply a previously established theory of wave propagation along thin, water-filled structures such as water-filled voids, basal water layers, or hydraulic fractures. Within such structures, short-wavelength waves experience restoring forces due to compressibility and are composed of sound waves. Long-wavelength resonances, in contrast, experience restoring forces due to elasticity and are composed of anomalously dispersed crack waves or Krauklis waves. Our borehole observations confirm the occurrence of both sound and crack waves within the basal water layer. Using both the resonance frequencies and attenuation of recorded crack waves we estimate thickness, aperture and length of the resonating basal water layer patch into which we drilled. We demonstrate that high-frequency observations of subglacial hydraulic processes provide new insights into this evolving dynamic system.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Cambridge University Press
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-sa/4.0/
dc.subject
glacier hydrology
en_US
dc.subject
glacier seismology
en_US
dc.subject
subglacial processes
en_US
dc.title
Crack wave resonances within the basal water layer
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
dc.date.published
2019-04-25
ethz.journal.title
Annals of Glaciology
ethz.journal.volume
60
en_US
ethz.journal.issue
79
en_US
ethz.pages.start
158
en_US
ethz.pages.end
166
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Glacial Hazard Monitoring with Seismology (GlaHMSeis)
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Cambridge
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09599 - Farinotti, Daniel / Farinotti, Daniel
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09558 - Walter, Fabian (ehemalig) / Walter, F. ((former))
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09599 - Farinotti, Daniel / Farinotti, Daniel
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09558 - Walter, Fabian (ehemalig) / Walter, F. ((former))
ethz.grant.agreementno
157551
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
SNF-Förderungsprofessuren Stufe 2
ethz.date.deposited
2019-08-06T08:31:47Z
ethz.source
FORM
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-08-20T05:46:58Z
ethz.rosetta.lastUpdated
2021-02-15T05:41:02Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/356785
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/359149
ethz.COinS
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