Finite Element Analysis of Calving From Ice Fronts
Finite Element Analysis of Calving From Ice Fronts
复制标题
冰锋崩解的有限元分析
DOI：
10.3189/s0260305500002603
复制
发表时间：
1982
影响因子：
2.9
通讯作者：
W. F. Schmidt
中科院分区：
文献类型：
--
作者：
J. Fastook;W. F. Schmidt
南极冰盖表面几乎没有每年的净消融，因此大部分质量损失都是通过沿着其周边的冰山崩解造成的，这些冰山可能在浅水中搁浅，也可能漂浮在深水中。在这两种情况下，一个冰悬崖形成沿着周边。波浪作用在沿着海滩的潮水带中对冰缘进行底切，如果底切速率与前进的冰速度相比，则会导致海岸崩解。如果冰的速度足够大，冰盖会进入更深的水域，在200至300米的深度变成漂浮物（Robin 1979）。一个漂浮的冰架然后形成和冰山崩解沿沿着冰锋。沿着这条冰锋的冰山崩解可能是由于几个原因造成的（Holdsworth 1977，Robin 1979）。由于冰山崩解，无论是从冰架或冰架之间的海滩的潮汐带，是南极冰盖的主要消融机制，它是重要的是要了解崩解动力学定量。本文介绍的结果，有限元检查产犊沿着浮动边缘的冰盖。
The Antarctic ice sheet has almost no net annual ablation on its surface, so most mass losses are by iceberg calving along its perimeter, which may be either grounded in shallow water or floating in deep water. An ice cliff forms along the perimeter in both cases. Wave action undercuts ice margins in the tide-water zone along beaches, and causes coastal calving if the rate of undercutting compares with the forward ice velocity. If the ice velocity is sufficiently greater, the ice sheet advances into deeper water and becomes a float at depths of 200 to 300 m (Robin 1979). A floating ice shelf then forms and icebergs calve along the ice front. Iceberg calving along this ice front may be due to several causes (Holdsworth 1977,Robin 1979). Since iceberg calving, either from ice shelves or in the tidewater zone of beaches between ice shelves, is the principal ablation mechanism of the Antarctic ice sheet, it is important to understand calving dynamics quantitatively. This paper presents the results of a finite-element examination of calving along floating margins of the ice sheet.