The influence of basal disturbances on the velocity fields of glaciers and ice streams

Mélanie Raymond, G. H. Gudmundsson, M. Vonmoos

Research output: Contribution to journalArticlepeer-review

Abstract

The influence of basal disturbances on the velocity fields of glaciers is investigated numerically in two dimensions. This is done for finite-amplitude perturbations in bedrock topography and in basal slipperiness for both linear and non-linear rheology. The effects of nonlinear rheology on the velocity fields are mainly quantitative consisting essentially in a concentration of the anomalous flow near the base and in a reduction of the horizontal velocity perturbation near the surface. At small wavelengths (< 3 ice thicknesses) and small perturbation amplitudes, a recirculation forms in the velocity pattern for both types of perturbations. The anomalous flow increases with the wavelength of the perturbation and reaches a maximum at around 10 ice thicknesses for sufficiently high slip ratios.

Original languageEnglish
Pages (from-to)41-63
Number of pages23
JournalMitteilungen der Versuchsanstalt fur Wasserbau, Hydrologie und Glaziologie an der Eidgenossischen Technischen Hochschule Zurich
Volume202
Publication statusPublished - 1 Dec 2007

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