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Record #164671:

Thermally controlled glacier surging / A.C. Fowler, Tavi Murray, F.S.L. Ng.

Title: Thermally controlled glacier surging / A.C. Fowler, Tavi Murray, F.S.L. Ng.
Author(s): Fowler, A. C.
Murray, Tavi.
Ng, F. S. L.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(159) (2001)
Abstract: Presents model for thermally regulated surging of polythermal glaciers overlying soft sediments. Describes surging behaviour, thermal regime, basal conditions and hydrology of Bakaninbreen, Svalbard and Trapridge Glacier, Yukon Territory, Canada. Both are polythermal and overlie metres thick layers of actively deforming sediments. Suggested mechanism is increasing ice thickness warms bed, increases water production and enhances sliding. Positive feedback leads to surging behaviour. Model represents interacting components of ice flow, meltwater evacuation and till deformation. Accounts for longitudinal variation of ice depth and velocity. Ignores 3-D effects associated with transverse flow variation and with vertical variation of velocity or temperature gradient. Adopts Boulton-Hindmarsh sliding law with additional basal shear stress due to vestigial roughness, i.e., sliding over substrate undulations at low/zero effective pressure. Defers non-trivial solution of spatially varying model. Solves instead zero-dimensional, lumped parameter model intended to retain essential physics while ignoring details. Analyses stability and presents modelled time series of ice flux, effective pressure and ice thickness. Large substrate permeability produces stable steady state. Low permeability and till thickness produce oscillations. Violence of these related to vestigial roughness and ability to release water accumulated at bed. Offers conclusions for interpretation of behaviour of Bakininbreen and Trapridge Glacier.
Notes:

Journal of Glaciology. Vol. 47(159) :527-538 (2001).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.22 -- Glaciers: Trapridge Glacier.
551.324.22 -- Glaciers: Bakaninbreen.
551.324.65 -- Land ice, surges and catastrophic changes.
551.321.8 -- Glaciological model experiments.
519.673 -- Modelling.
.000(410) -- British author.
E5 -- Glaciology: land ice.
(*32) -- Svalbard.
(*430) -- Yukon Territory.
SPRI record no.: 164671

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500 ## ‡aJournal of Glaciology. Vol. 47(159) :527-538 (2001).
520 3# ‡aPresents model for thermally regulated surging of polythermal glaciers overlying soft sediments. Describes surging behaviour, thermal regime, basal conditions and hydrology of Bakaninbreen, Svalbard and Trapridge Glacier, Yukon Territory, Canada. Both are polythermal and overlie metres thick layers of actively deforming sediments. Suggested mechanism is increasing ice thickness warms bed, increases water production and enhances sliding. Positive feedback leads to surging behaviour. Model represents interacting components of ice flow, meltwater evacuation and till deformation. Accounts for longitudinal variation of ice depth and velocity. Ignores 3-D effects associated with transverse flow variation and with vertical variation of velocity or temperature gradient. Adopts Boulton-Hindmarsh sliding law with additional basal shear stress due to vestigial roughness, i.e., sliding over substrate undulations at low/zero effective pressure. Defers non-trivial solution of spatially varying model. Solves instead zero-dimensional, lumped parameter model intended to retain essential physics while ignoring details. Analyses stability and presents modelled time series of ice flux, effective pressure and ice thickness. Large substrate permeability produces stable steady state. Low permeability and till thickness produce oscillations. Violence of these related to vestigial roughness and ability to release water accumulated at bed. Offers conclusions for interpretation of behaviour of Bakininbreen and Trapridge Glacier.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.22 -- Glaciers: Trapridge Glacier.‡2udc
650 07 ‡a551.324.22 -- Glaciers: Bakaninbreen.‡2udc
650 07 ‡a551.324.65 -- Land ice, surges and catastrophic changes.‡2udc
650 07 ‡a551.321.8 -- Glaciological model experiments.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡a.000(410) -- British author.‡2udc
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651 #7 ‡a(*32) -- Svalbard.‡2udc
651 #7 ‡a(*430) -- Yukon Territory.‡2udc
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