CGRG Bibliography of Canadian Geomorphology
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Author : Fischer, U.H.; and Clarke, G.K.C.
Date : 1997
Title : Clast collision frequency as an indicator of glacier sliding rate.
Publication : Journal of Glaciology
Issue : 43(143):
Page(s) : 460-466.



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Abstract

The mechanical interaction between a glacier and subglacial sediment can be observed using an instrumented rod that we refer to as the UBC ploughmeter. For clast-rich sediments, the rate of collision between clasts and a rod dragged through these sediments should be related to the glacier sliding rate. By assuming that proglacial measurements of granulometry represent the subglacial granulometry of Trapridge Glacier, Yukon Territory, Canada, we have used ploughmeter results to obtain an estimated sliding rate of ~45 mm d(-1), in good agreement with known rates. In addition, for a subglacial material treated as a solid-liquid dispersion having a linear viscous rheology, the force of collision experienced by the rod should be proportional to the effective sediment viscosity. Our estimate of ~2.0 x 10(10) Pa s agrees with previously derived values.

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Bibliography of Canadian Geomorphology