Fracture mechanics approach to penetration of bottom crevasses on glaciers

被引：149

作者：

van der Veen, CJ ^{[1
]}

机构：

[1] Ohio State Univ, Byrd Polar Res Ctr, Columbus, OH 43210 USA

来源：

COLD REGIONS SCIENCE AND TECHNOLOGY | 1998年 / 27卷 / 03期

基金：

美国国家科学基金会;

关键词：

fracture mechanics; bottom crevasses; glaciers;

D O I：

10.1016/S0165-232X(98)00006-8

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A simple model, based on linear elastic fracture mechanics, is used to investigate conditions allowing the existence of bottom crevasses. On grounded glaciers, these crevasses can only occur if the basal water pressure is close to the ice overburden pressure. If the piezometric head drops more than similar to 10 m below the flotation level, very large stretching rates are required for appreciable bottom crevasses to form. This combination of special conditions may explain the lack of observations of basal crevassing on grounded glaciers. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：213 / 223

页数：11