Direct measurement of basal motion at a hard-bedded, temperate glacier: Glacier de Tsanfleuron, Switzerland

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dc.contributor.author Hubbard, Bryn
dc.date.accessioned 2008-12-10T12:34:22Z
dc.date.available 2008-12-10T12:34:22Z
dc.date.issued 2002-01
dc.identifier.citation Hubbard , B 2002 , ' Direct measurement of basal motion at a hard-bedded, temperate glacier: Glacier de Tsanfleuron, Switzerland ' Journal of Glaciology , vol 48 , no. 160 , pp. 1-8 . , 10.3189/172756502781831610 en
dc.identifier.issn 0022-1430
dc.identifier.other PURE: 94302
dc.identifier.other dspace: 2160/1509
dc.identifier.uri http://hdl.handle.net/2160/1509
dc.identifier.uri http://www.ingentaconnect.com/content/igsoc/jog/2002/00000048/00000160/art00001 en
dc.identifier.uri http://cat.inist.fr/?aModele=afficheN&cpsidt=13822157 en
dc.description Hubbard, B. (2002) Direct measurement of basal motion at a hard-bedded, temperate glacier: Glacier de Tsanfleuron, Switzerland. Journal of Glaciology, 48 (160) pp.1-8 RAE2008 en
dc.description.abstract A rigid mast, equipped with five multi-turn potentiometers, was bolted to the bedrock floor of a frontal cavity at Glacier de Tsanfleuron, Switzerland. Each potentiometer was linked by a thin cord to an anchor emplaced in the adjacent ice wall, enabling basal ice motion to be measured continually over a 6 day period in the late summer. Results indicate that basal ice velocity increased quasi-linearly away from the glacier bed, rising from 10.66 to 11.82 mm d-1 between 25 and ∼265 mm above the ice-bed interface. Extrapolation of this gradient indicates that ∼10.55 mm d-1 may have been accommodated by pure slip between the ice and the glacier bed. Basal ice motion is temporally variable, generally being characterized by tens of minutes to hours of little or no motion interspersed with rapid-motion events lasting for between <120 s (a single measurement interval) and 360 s. These motion events were responsible for speeds of up to > 400 mm d-1 over individual measurement intervals. The magnitude-frequency distribution of these events is consistent with a pattern of infrequent and large slips initiated at the ice--bed interface, that are manifested as more frequent and smaller motion events some tens of cm above that interface. en
dc.format.extent 8 en
dc.language.iso eng
dc.relation.ispartof Journal of Glaciology en
dc.title Direct measurement of basal motion at a hard-bedded, temperate glacier: Glacier de Tsanfleuron, Switzerland en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.3189/172756502781831610
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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