Basal Water Film, Basal Water Pressure, and Velocity of Traveling Waves on Glaciers
Basal Water Film, Basal Water Pressure, and Velocity of Traveling Waves on Glaciers
复制标题
冰川上的基础水膜、基础水压和行波速度
DOI：
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发表时间：
1983
影响因子：
3.4
通讯作者：
G. E. Birchfield
中科院分区：
文献类型：
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作者：
J. Weertman;G. E. Birchfield
本文将Nye和Weertman的冰川行波理论推广到当基底水丰富或基底水压力增加时，冰川在河床上的滑动增加的情况。结果表明，行波速度与表面速度的比值与水量和基底水压力无关。这一比值的理论值约为4比5，与实地测量结果一致（最新数据来自Mer de Glace）。它的结论是，现场观测的行波速度提供强有力的支持，任何冰川滑动理论，其中的滑动速度是成正比的基础剪切应力提高到约二至五次幂，其中的滑动速度是一个函数的一个或两个的量的水在一个冰川的床和压力在这个水。
Abstract 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.