The motion of ice sheets and glaciers

摘要: The distribution of velocity along a vertical line in Greenland is calculated. Almost all the relative shear motion concentrated at and very near to bottom, this result thought apply generally Antarctica. It due relatively high temperature lowest layers strong dependence creep rate on temperature. outward being thus almost constant with depth, it assumed proportional mth power stress bed; results previously obtained by approximation perfect plasticity then correspond m→∞. Steady-state solutions for finite m are derived, non-steady states discussed use Weertman’s perturbation method. steady-state height an ice sheet found be insensitive accumulation. Surface waves Antarctica attributed mountains buried beneath ice, shown how form mountain ridge may calculated from associated surface disturbance. application law sliding glaciers leads expression longitudinal strain-rate, hitherto undetermined parameter.