A glacial lake outburst flood associated with recent mountain glacier retreat, Patagonian Andes
A glacial lake outburst flood associated with recent mountain glacier retreat, Patagonian Andes
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DOI：
10.1191/0959683606hl957rr
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发表时间：
2006-05
期刊：
影响因子：
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通讯作者：
S. Harrison;N. Glasser;V. Winchester;Eleanor Haresign;C. Warren;K. Jansson
中科院分区：
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作者：
S. Harrison;N. Glasser;V. Winchester;Eleanor Haresign;C. Warren;K. Jansson
地貌学测绘、沉积学、地衣测量学和树木年代学被用于评估智利北部海洛Patagónico以东的利奥内斯山谷一条支流的冰川消退、冰碛发育和灾难性物质运动的性质和时间。我们表明，在“小冰期”，冰川卡拉法特向下推进，产生了一个终端冰碛。1870年代，冰川从这个位置开始退缩，形成了一个冰碛湖。2000年末，一场巨大的岩崩冲入湖中，打破了冰碛，引发了冰湖溃决洪水（GLOF），洪水带走并随后沉积了约2 × 106立方米的物质。我们将这一事件解释为20世纪卡拉法特冰川退缩的延迟副冰川反应。
Geomorphological mapping, sedimentology, lichenometry and dendrochronology were used to assess the nature and timing of glacier recession, moraine development and catastrophic mass movements in a tributary of the Leones valley, east of the Hielo Patagónico Norte, Chile. We show that during the 'Little Ice Age' Glaciar Calafate advanced downvalley to produce a terminal moraine. Recession of the glacier from this position occurred in the 1 870s and produced a moraine dammed lake. In late 2000 a large rockfall into the lake breached the moraine and triggered a glacial lake outburst flood (GLOF) that entrained and subsequently deposited some 2 x 106 m3 of material. We interpret this event as a delayed paraglacial response to the retreat of Glaciar Calafate during the twentieth century.