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Record #164664:

Abrupt glacier motion and reorganization of basal shear stress following the establishment of a connected drainage system / Jeffrey L. Kavanaugh, Garry K.C. Clarke.

Title: Abrupt glacier motion and reorganization of basal shear stress following the establishment of a connected drainage system / Jeffrey L. Kavanaugh, Garry K.C. Clarke.
Author(s): Kavanaugh, Jeffrey L.
Clarke, Garry K. C.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(158) (2001)
Abstract: Examines subglacial hydromechanical events of June 1995 at Trapridge Glacier, Yukon Territory, Canada. Following establishment of a subglacial drainage system, pressure fluctuations in the drainage system weakened a region of the bed acting as a local pinning point and resulted in three episodes of strong basal motion (i.e. sliding and/or sediment deformation). Discusses records from pressure transducers, conductivity and turbidity sensors, instruments to measure mechanical forcings, a vertical strain sensor, and geophones in the glacier bed. These indicate that hydraulic connection was established simultaneously over a 20 000 m² area, with basal stress transferred to the unconnected region of the bed. Absence of strong basal motion for several weeks following the events suggests that unstable situations can be quickly accommodated by mechanical adjustments at the glacier bed.
Notes:

Journal of Glaciology. Vol. 47(158) :472-480 (2001).

Keywords: 551.32 -- Glaciology.
551.324.22 -- Glaciers: Trapridge Glacier.
551.324.65 -- Land ice, surges and catastrophic changes.
551.324.86 -- Glacier streams.
E5 -- Glaciology: land ice.
(*41) -- Canada.
(*430) -- Yukon Territory.
SPRI record no.: 164664

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245 10 ‡aAbrupt glacier motion and reorganization of basal shear stress following the establishment of a connected drainage system /‡cJeffrey L. Kavanaugh, Garry K.C. Clarke.
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300 ## ‡ap. 472-480 :‡bdiags.
500 ## ‡aJournal of Glaciology. Vol. 47(158) :472-480 (2001).
520 3# ‡aExamines subglacial hydromechanical events of June 1995 at Trapridge Glacier, Yukon Territory, Canada. Following establishment of a subglacial drainage system, pressure fluctuations in the drainage system weakened a region of the bed acting as a local pinning point and resulted in three episodes of strong basal motion (i.e. sliding and/or sediment deformation). Discusses records from pressure transducers, conductivity and turbidity sensors, instruments to measure mechanical forcings, a vertical strain sensor, and geophones in the glacier bed. These indicate that hydraulic connection was established simultaneously over a 20 000 m² area, with basal stress transferred to the unconnected region of the bed. Absence of strong basal motion for several weeks following the events suggests that unstable situations can be quickly accommodated by mechanical adjustments at the glacier bed.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324.22 -- Glaciers: Trapridge Glacier.‡2udc
650 07 ‡a551.324.65 -- Land ice, surges and catastrophic changes.‡2udc
650 07 ‡a551.324.86 -- Glacier streams.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(*41) -- Canada.‡2udc
651 #7 ‡a(*430) -- Yukon Territory.‡2udc
700 1# ‡aClarke, Garry K. C.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(158) (2001) ‡wSPRI-20534
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