Changes in Imja Tsho in the Mount Everest region of Nepal
Changes in Imja Tsho in the Mount Everest region of Nepal
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DOI：
10.5194/tc-8-1661-2014
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
M. Somos-Valenzuela;D. McKinney;D. Rounce;A. Byers
中科院分区：
文献类型：
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作者：
M. Somos-Valenzuela;D. McKinney;D. Rounce;A. Byers
抽象的。Imja Tsho位于尼泊尔的萨加玛塔（珠峰）国家公园，是喜马拉雅山脉中研究最多和增长最快的湖泊之一。与以前的研究相比，我们在2012年9月进行的声纳测深调查结果表明，自2002年以来，其最大深度从90.5米增加到116.3 ± 5.2米，其估计体积从35.8 ± 0.7增加到61.7 ± 3.7百万立方米。近年来，湖泊的大部分扩张发生在湖泊东端的冰川终端-湖泊界面，冰川退缩约为52 m yr−1，湖泊面积扩大0.04 km 2 yr−1。对冰川终点后面的Imja-Lhotse Shar冰川进行的地面穿透雷达调查显示，冰川中心的冰厚超过200米。如果在湖泊西端的筑坝冰碛发生决口，可能从湖泊中释放的水量从2002年估计的2100万立方米增加到3410万± 108万立方米。
Abstract. Imja Tsho, located in the Sagarmatha (Everest) National Park of Nepal, is one of the most studied and rapidly growing lakes in the Himalayan range. Compared with previous studies, the results of our sonar bathymetric survey conducted in September of 2012 suggest that its maximum depth has increased from 90.5 to 116.3 ± 5.2 m since 2002, and that its estimated volume has grown from 35.8 ± 0.7 to 61.7 ± 3.7 million m3. Most of the expansion of the lake in recent years has taken place in the glacier terminus–lake interface on the eastern end of the lake, with the glacier receding at about 52 m yr−1 and the lake expanding in area by 0.04 km2 yr−1. A ground penetrating radar survey of the Imja–Lhotse Shar glacier just behind the glacier terminus shows that the ice is over 200 m thick in the center of the glacier. The volume of water that could be released from the lake in the event of a breach in the damming moraine on the western end of the lake has increased to 34.1 ± 1.08 million m3 from the 21 million m3 estimated in 2002.