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首页> 外文期刊>Journal of Asian earth sciences >New observations on present and prehistorical glacier-dammed lakes in the Shimshal valley (Karakoram Mountains)
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New observations on present and prehistorical glacier-dammed lakes in the Shimshal valley (Karakoram Mountains)

机译：Shimshal山谷（喀喇昆仑山）目前和史前冰川阻塞的湖泊的新观测

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摘要

In the upper Shimshal valley three glacier dams are present along a horizontal distance of only 25 km: the Khurdopin/Yukshin Gardan, Yazghil and Malungutti glaciers. Only a few decameters separate the glacier tongues from the opposite valley flanks. At some localities the drainage of the main river already takes place subglacially. About 20 glacial floods occurred in the last century in the Shimshal valley, some of them with devastating consequences. The erosion potential is clearly visible by the high loss of settlement areas of the villages Shimshal (3080 m) and Pasu (2450 m). In the past, the lake formation was mainly attributed to the Khurdopin dam. New field observations in summer 2001 revealed that advances of the Yukshin Gardan glacier can also contribute to a blockade of the Shimshal river. Slightest snow line depressions already would lead to numerous stable glacier dams and therefore to long-lasting ice-dammed lakes. Such a situation occurred during Neoglacial times, if not even during the Little Ice Age. Huge sequences of lake sediments, several decameters in height, evidence the prehistorical glacial lake ponding in the Karakoram valleys.
机译：在Shimshal山谷上游，仅25公里的水平距离就有3个冰川水坝：Khurdopin / Yukshin Gardan，Yazghil和Malungutti冰川。仅有几米的冰川舌与相对的山谷两侧分开。在某些地方，主要河流的排水已经在冰河以下进行。上个世纪，Shimshal山谷发生了约20场冰川洪水，其中一些造成了毁灭性后果。 Shimshal（3080 m）和Pasu（2450 m）村庄的定居区大量损失，可以清楚地看到侵蚀的可能性。过去，湖泊形成主要归因于库尔多平水坝。 2001年夏季进行的新野外观测表明，尤金·加尔丹（Yukshin Gardan）冰川的发展也可能导致了Shimshal河的封锁。轻微的雪线洼地已经导致许多稳定的冰川水坝，并因此导致了持久的冰坝湖泊。这种情况发生在新冰期，即使在小冰河时期也没有发生。湖泊沉积物的巨大序列，高度为数十米，证明了喀喇昆仑山谷中史前的冰川湖。

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