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Record #97314:

A map-plane finite-element model: three modeling experiments / James L. Fastook, Judith E. Chapman.

Title: A map-plane finite-element model: three modeling experiments / James L. Fastook, Judith E. Chapman.
Author(s): Fastook, James L.
Chapman, Judith E.
Date: 1989.
In: Journal of Glaciology. (1989.), Vol. 35(119) (1989)
Abstract: Preliminary results are presented of solution of two-dimensional time-dependent continuity equation for mass conservation governing ice-sheet dynamics. Equation is solved using column-averaged velocity to define horizontal flux in finite-element formulation, yielding map-plane model where flow directions, velocities, and surface elevations are defined by bedrock topography, accumulation/ablation pattern, and, in time-dependent case, by initial surface configuration. This alleviates flow-band model limitation that direction of flow be defined and fixed over course of experiment. Ability of finite-element method to accept elements of different dimensions allows detail to be finely modelled in regions of steep gradients, such as ice streams, while relative uniform areas can be accommodated with much larger elements. Modelling experiments described include steady-state reconstruction showing flow around three-dimensional obstacle, as well as time-dependent simulation demonstrating response of ice sheet to localized decoupling of bed (simulating initiation and development of ice stream in region originally dominated by sheet flow). Simulation of effects of changing mass-balance pattern, such as might be expected from CO₂-induced warming, is described.
Notes:

Journal of Glaciology. Vol. 35(119) :48-52 (1989).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.43 -- Land ice, regime and mass balance.
551.324.51 -- Land ice, theory of flow.
E5 -- Glaciology: land ice.
SPRI record no.: 97314

MARCXML

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245 12 ‡aA map-plane finite-element model :‡bthree modeling experiments /‡cJames L. Fastook, Judith E. Chapman.
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500 ## ‡aJournal of Glaciology. Vol. 35(119) :48-52 (1989).
520 3# ‡aPreliminary results are presented of solution of two-dimensional time-dependent continuity equation for mass conservation governing ice-sheet dynamics. Equation is solved using column-averaged velocity to define horizontal flux in finite-element formulation, yielding map-plane model where flow directions, velocities, and surface elevations are defined by bedrock topography, accumulation/ablation pattern, and, in time-dependent case, by initial surface configuration. This alleviates flow-band model limitation that direction of flow be defined and fixed over course of experiment. Ability of finite-element method to accept elements of different dimensions allows detail to be finely modelled in regions of steep gradients, such as ice streams, while relative uniform areas can be accommodated with much larger elements. Modelling experiments described include steady-state reconstruction showing flow around three-dimensional obstacle, as well as time-dependent simulation demonstrating response of ice sheet to localized decoupling of bed (simulating initiation and development of ice stream in region originally dominated by sheet flow). Simulation of effects of changing mass-balance pattern, such as might be expected from CO₂-induced warming, is described.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.43 -- Land ice, regime and mass balance.‡2udc
650 07 ‡a551.324.51 -- Land ice, theory of flow.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
700 1# ‡aChapman, Judith E.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 35(119) (1989) ‡wSPRI-20534
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