A. Vieli
Flow dynamics of tidewater glaciers: a numerical modelling approach
Vieli, A.; Funk, M.; Blatter, H.
Authors
M. Funk
H. Blatter
Abstract
The dynamics of grounded tidewater glaciers is investigated with a time-dependent numerical flow model, which solves the full equations for the stress and velocity fields and includes a water-pressure-dependent sliding law. The calving criterion implemented in the model shifts the calving front at each time-step to the position where the frontal ice thickness exceeds flotation height by a prescribed value. With this model, the linear relation between calving rate and water depth proposed on empirical grounds is qualitatively reproduced for the situation of a slowly retreating or advancing terminus, but not for situations of rapid changes. Length changes of tidewater glaciers, i.e.especially rapid changes, are dominantly controlled by the bed topography and are to a minor degree a direct reaction to a mass-balance change. Thus, accurate information on the near-terminus bed topography is required for reliable prediction of the terminus changes due to climate changes. The results also confirm the suggested cycles of slow advance and rapid retreat through a basal depression. Rapid changes in terminus positions preferably occur in places where the bed slopes upwards in the ice-flow direction.
Citation
Vieli, A., Funk, M., & Blatter, H. (2001). Flow dynamics of tidewater glaciers: a numerical modelling approach. Journal of Glaciology, 47(159), 595-606. https://doi.org/10.3189/172756501781831747
Journal Article Type | Article |
---|---|
Publication Date | 2001-12 |
Deposit Date | Nov 14, 2006 |
Publicly Available Date | Apr 6, 2010 |
Journal | Journal of Glaciology |
Print ISSN | 0022-1430 |
Electronic ISSN | 1727-5652 |
Publisher | International Glaciological Society |
Peer Reviewed | Peer Reviewed |
Volume | 47 |
Issue | 159 |
Pages | 595-606 |
DOI | https://doi.org/10.3189/172756501781831747 |
Keywords | Southern Patagonia, Subglacial Water, Columbia Glacier, Hydrologic Basis, Rapid Motion, San-Rafael, Alaska, Switzerland, Stability, Pressure. |
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Copyright Statement
© 2001 International Glaciological Society
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