Physics – Geophysics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106401s&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 6, CiteID L06401
Physics
Geophysics
6
Hydrology: Glaciology (1863), Mathematical Geophysics: Modeling, Mathematical Geophysics: Nonlinear Dynamics
Scientific paper
Extensive bed topography at the scale of the ice thickness occurs frequently in the form of drumlins. By analogy with hard-bed sliding, ice flow over this type of topography leads to the generation of drag on the ice, particularly when ice flow is rapid. A crucial difference with classical Nye-Kamb sliding is that the upper, free surface of the ice has a significant effect on the sliding process through the formation of a standing wave. Using a theoretical model, we demonstrate that the presence of this wave introduces a non-linearity into the sliding motion which can lead to multiple sliding velocities for the same large-scale ice stream geometry, and that switches between these velocities can cause surging behavior.
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