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Record #164678:

Flow dynamics of tidewater glaciers: a numerical modelling approach / Andreas Vieli, Martin Funk, Heinz Blatter.

Title: Flow dynamics of tidewater glaciers: a numerical modelling approach / Andreas Vieli, Martin Funk, Heinz Blatter.
Author(s): Vieli, Andreas.
Funk, Martin.
Blatter, Heinz.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(159) (2001)
Abstract: Uses time-dependent numerical flow model to investigate dynamics of tidewater glaciers with a grounded terminus. Calculates surface evolution and two-dimensional flow regime for longitudinal section, solving full equations for stress and velocity fields and including a water- pressure-dependent sliding law. Assumes subglacial water pressure corresponds to sea level, with no seasonal variations. Implements calving criterion by moving terminus each time step to where ice thickness exceeds flotation by critical fraction. Investigates two mass-balance scenarios, leading to advancing and retreating situations from an initial steady state. When model is applied to characteristic geometry with basal depression in terminus region, results confirm cycles of slow advance and rapid retreat suggested in the literature. For slow advances or retreats, model qualitatively reproduces known empirical relation between calving rate and water depth. Rapid retreats preferably occur where bed at terminus slopes up in direction of flow. Concludes that climate induced thinning does not directly cause terminus retreat, but may trigger it through what is predominantly an effect of bed topography. Expects predicting tidewater glacier response to climate change to require knowledge of basal topography in frontal region.
Notes:

Journal of Glaciology. Vol. 47(159) :595-606 (2001).

Keywords: 551.32 -- Glaciology.
551.321.8 -- Glaciological model experiments.
551.324.51 -- Land ice, theory of flow.
519.673 -- Modelling.
551.324.63 -- Land ice, advance and retreat.
551.324.433 -- Land ice, ablation and calving.
E5 -- Glaciology: land ice.
SPRI record no.: 164678

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520 3# ‡aUses time-dependent numerical flow model to investigate dynamics of tidewater glaciers with a grounded terminus. Calculates surface evolution and two-dimensional flow regime for longitudinal section, solving full equations for stress and velocity fields and including a water- pressure-dependent sliding law. Assumes subglacial water pressure corresponds to sea level, with no seasonal variations. Implements calving criterion by moving terminus each time step to where ice thickness exceeds flotation by critical fraction. Investigates two mass-balance scenarios, leading to advancing and retreating situations from an initial steady state. When model is applied to characteristic geometry with basal depression in terminus region, results confirm cycles of slow advance and rapid retreat suggested in the literature. For slow advances or retreats, model qualitatively reproduces known empirical relation between calving rate and water depth. Rapid retreats preferably occur where bed at terminus slopes up in direction of flow. Concludes that climate induced thinning does not directly cause terminus retreat, but may trigger it through what is predominantly an effect of bed topography. Expects predicting tidewater glacier response to climate change to require knowledge of basal topography in frontal region.
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650 07 ‡a551.321.8 -- Glaciological model experiments.‡2udc
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650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡a551.324.63 -- Land ice, advance and retreat.‡2udc
650 07 ‡a551.324.433 -- Land ice, ablation and calving.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
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