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Record #117992:

Flow-law hypotheses for ice-sheet modeling / Richard B. Alley.

Title: Flow-law hypotheses for ice-sheet modeling / Richard B. Alley.
Author(s): Alley, Richard B.
Date: 1992.
In: Journal of Glaciology. (1992.), Vol. 38(129) (1992)
Abstract: Ice-flow modelling requires flow law relating strain rates to stresses in situ, but flow law cannot be measured directly in ice sheets. Microscopic processes such as dislocation glide and boundary diffusion control flow law for ice and development of physical properties such as grain size and c-axis fabric. These processes can be inferred from observations of physical properties, and flow law can then be estimated from them. Review of available literature shows that this approach can be imperfectly successful. Interior regions of large ice sheets probably have depth-varying flow-law "constants", with stress component, n, for power-law creep <3 in upper regions and equal to 3 only in deep ice; n probably equals 3 through most of thickness of ice shelves and ice streams.
Notes:

Journal of Glaciology. Vol. 38(129) :245-256 (1992).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.24 -- Ice sheets and caps.
551.324.51 -- Land ice, theory of flow.
519.673 -- Modelling.
E5 -- Glaciology: land ice.
SPRI record no.: 117992

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520 3# ‡aIce-flow modelling requires flow law relating strain rates to stresses in situ, but flow law cannot be measured directly in ice sheets. Microscopic processes such as dislocation glide and boundary diffusion control flow law for ice and development of physical properties such as grain size and c-axis fabric. These processes can be inferred from observations of physical properties, and flow law can then be estimated from them. Review of available literature shows that this approach can be imperfectly successful. Interior regions of large ice sheets probably have depth-varying flow-law "constants", with stress component, n, for power-law creep <3 in upper regions and equal to 3 only in deep ice; n probably equals 3 through most of thickness of ice shelves and ice streams.
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