Basal Water Film, Basal Water Pressure, and Velocity of Traveling Waves on Glaciers
| Autor: | G. E. Birchfield, J. Weertman |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
010506 paleontology
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Mineralogy Glacier Water pressure Surface velocity 01 natural sciences Shear stress Traveling wave Geomorphology Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of Glaciology. 29:20-27 |
| ISSN: | 1727-5652 0022-1430 |
| DOI: | 10.1017/s0022143000005116 |
| Popis: | The theory of Nye and of Weertman of traveling waves on glaciers is extended to cover the situation where the presence of abundant basal water or increased basal water pressure produces increased sliding of a glacier over its bed. It is found that the ratio of traveling-wave velocity to surface velocity is independent of the amount of water or the basal water pressure. The theoretical value of this ratio, about 4 to 5, agrees with that found in field measurements (the most recent data are from Mer de Glace). It is concluded that field observations of traveling-wave velocities lend strong support to any glacier sliding theory in which the sliding velocity is proportional to the basal shear stress raised to about a second to fifth power and in which the sliding velocity is a function of either or both the amount of water at the bed of a glacier and the pressure within this water. |
| Databáze: | OpenAIRE |
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