A viscoelastic model of ice stream flow with application to stick-slip motion

Ryan T. Walker, Byron R. Parizek, Richard B. Alley, Sophie M J Nowicki

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Stick-slip motion such as that observed at Whillans Ice Stream, West Antarctica, is one example of transient forcing significantly affecting longer-term ice-stream dynamics. We develop and present a two-dimensional map-plane viscoelastic model of perturbations to ice-stream dynamics suitable for simulating and analyzing stick-slip behavior. Model results suggest important roles in stick-slip motion for both the elastic and viscous components of ice rheology, confirming and extending inferences drawn from simple models and observations. Elastic behavior depends on the rate of applied stress, at times allowing significant velocity perturbations with little change in accumulated stress perturbation; in contrast, viscous behavior depends on total accumulated stress and can lead to changes in ice-stream thickness over many stick-slip cycles.

Original languageEnglish (US)
Article number2
JournalFrontiers in Earth Science
Volume4
DOIs
StatePublished - Jan 26 2016

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stick-slip
ice stream
ice flow
streamflow
perturbation
rheology
ice

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

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abstract = "Stick-slip motion such as that observed at Whillans Ice Stream, West Antarctica, is one example of transient forcing significantly affecting longer-term ice-stream dynamics. We develop and present a two-dimensional map-plane viscoelastic model of perturbations to ice-stream dynamics suitable for simulating and analyzing stick-slip behavior. Model results suggest important roles in stick-slip motion for both the elastic and viscous components of ice rheology, confirming and extending inferences drawn from simple models and observations. Elastic behavior depends on the rate of applied stress, at times allowing significant velocity perturbations with little change in accumulated stress perturbation; in contrast, viscous behavior depends on total accumulated stress and can lead to changes in ice-stream thickness over many stick-slip cycles.",
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A viscoelastic model of ice stream flow with application to stick-slip motion. / Walker, Ryan T.; Parizek, Byron R.; Alley, Richard B.; Nowicki, Sophie M J.

In: Frontiers in Earth Science, Vol. 4, 2, 26.01.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A viscoelastic model of ice stream flow with application to stick-slip motion

AU - Walker, Ryan T.

AU - Parizek, Byron R.

AU - Alley, Richard B.

AU - Nowicki, Sophie M J

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AB - Stick-slip motion such as that observed at Whillans Ice Stream, West Antarctica, is one example of transient forcing significantly affecting longer-term ice-stream dynamics. We develop and present a two-dimensional map-plane viscoelastic model of perturbations to ice-stream dynamics suitable for simulating and analyzing stick-slip behavior. Model results suggest important roles in stick-slip motion for both the elastic and viscous components of ice rheology, confirming and extending inferences drawn from simple models and observations. Elastic behavior depends on the rate of applied stress, at times allowing significant velocity perturbations with little change in accumulated stress perturbation; in contrast, viscous behavior depends on total accumulated stress and can lead to changes in ice-stream thickness over many stick-slip cycles.

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