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Record #164625:

Implications of till deformation on glacier dynamics / Martin Truffer, Keith A. Echelmeyer, William D. Harrison.

Title: Implications of till deformation on glacier dynamics / Martin Truffer, Keith A. Echelmeyer, William D. Harrison.
Author(s): Truffer, Martin.
Echelmeyer, Keith A.
Harrison, William D.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(156) (2001)
Abstract: Investigates whether current understanding of till physics sufficient to explain general features of observations made on the surface of glaciers. Uses mainly 1997 observations of water pressure and velocity and cross sectional numerical model of glacier flow. Finds treatment of till as Coulomb-plastic material sufficient, in principle, to explain velocity variations on a wide range of time scales by attributing them to changes in water pressure and till volume. Consequent transfer of drag leads to breakdown of linear depth dependence of shear stress at centre of channel. Viscous rheology inconsistent with observations on Black Rapids Glacier, Alaska. Does not find clear signature of a till layer in surface dynamics.
Notes:

Journal of Glaciology. Vol. 47(156) :123-134 (2001).

Keywords: 551.32 -- Glaciology.
551.324.22 -- Glaciers: Black Rapids Glacier.
551.324.5 -- Land ice, flow.
551.331.5 -- Glacial erosion and protection. Sub-glacial topography.
551.332.21 -- Till or boulder clay. Tillite. Glacial diamictites.
519.673 -- Modelling.
E5 -- Glaciology: land ice.
(73) -- United States.
(*49) -- Alaska.
(*493) -- Alaska, interior.
SPRI record no.: 164625

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245 10 ‡aImplications of till deformation on glacier dynamics /‡cMartin Truffer, Keith A. Echelmeyer, William D. Harrison.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2001.
300 ## ‡ap. 123-134 :‡bdiags., tables.
500 ## ‡aJournal of Glaciology. Vol. 47(156) :123-134 (2001).
520 3# ‡aInvestigates whether current understanding of till physics sufficient to explain general features of observations made on the surface of glaciers. Uses mainly 1997 observations of water pressure and velocity and cross sectional numerical model of glacier flow. Finds treatment of till as Coulomb-plastic material sufficient, in principle, to explain velocity variations on a wide range of time scales by attributing them to changes in water pressure and till volume. Consequent transfer of drag leads to breakdown of linear depth dependence of shear stress at centre of channel. Viscous rheology inconsistent with observations on Black Rapids Glacier, Alaska. Does not find clear signature of a till layer in surface dynamics.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324.22 -- Glaciers: Black Rapids Glacier.‡2udc
650 07 ‡a551.324.5 -- Land ice, flow.‡2udc
650 07 ‡a551.331.5 -- Glacial erosion and protection. Sub-glacial topography.‡2udc
650 07 ‡a551.332.21 -- Till or boulder clay. Tillite. Glacial diamictites.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(73) -- United States.‡2udc
651 #7 ‡a(*49) -- Alaska.‡2udc
651 #7 ‡a(*493) -- Alaska, interior.‡2udc
700 1# ‡aEchelmeyer, Keith A.
700 1# ‡aHarrison, William D.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(156) (2001) ‡wSPRI-20534
917 ## ‡aUnenhanced record from Muscat, imported 2019
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