Reversal of ice motion during the outburst of a glacier-dammed lake on Gornergletscher, Switzerland

被引:43
|
作者
Sugiyama, Shin [1 ]
Bauder, Andreas
Weiss, Patrik
Funk, Martin
机构
[1] Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan
[2] ETH Zentrum, VAW, CH-8092 Zurich, Switzerland
关键词
D O I
10.3189/172756507782202847
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
During the outburst flood of a glacier-dammed lake on Gornergletscher, Switzerland, in July 2004, the drained lake water triggered anomalous glacier motion. At the onset of the outburst, the ice-flow direction in the vicinity of the lake became closer to the central flowline. When the lake discharge magnitude decreased, the flow direction altered such that the ice moved back to the azimuth of the initial motion. At one of the survey points, where the ice flows parallel to the central flowline, the ice accelerated along the pre-event flow direction followed by a 180 degrees backward motion that lasted over 2 days. These observations indicate the impact of the lake outburst on the subglacial and englacial stress conditions; however, the reversal in the flow direction is difficult to explain by drawing on our current understanding of glacier mechanics. The timing and the timescale of the flow-direction changes suggest that the elastic glacier motion and its rebound played a role under the rapidly changing stress conditions, but the Young's modulus of ice is too large to cause the observed ice motion. Other processes, including basal separation and subglacial sediment deformation, are discussed as possible mechanisms for the reversal of the ice motion.
引用
收藏
页码:172 / 180
页数:9
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