冰川
地质学
落石
冰碛
数字高程模型
自然地理学
山崩
流域
冰川物质平衡
构造盆地
岩石冰川
地貌学
作者
Weile Li,Bo Zhao,Qiang Xu,Gianvito Scaringi,Huiyan Lu,Runqiu Huang
标识
DOI:10.1007/s10346-021-01798-z
摘要
Increasingly frequent glacier-rock avalanches (GRAs) – events triggered by the detachment of both glacier and rock materials – have occurred in recent years in the Sedongpu gully in the eastern Himalayan syntaxis, blocking the course of the Yarlung Zangbo River repeatedly. To identify spatio-temporal patterns and influencing factors of these GRAs, we analyzed remote sensing images and produced high-resolution digital surface models. At least eight GRAs, originating from the same source areas, have occurred in the past decades: one in 1974, one in 2014, and six between 2017 and 2018. The GRAs that occurred since 2014 were responsible for the loss of > 70 Mm3 of glacier and rock and > 150 Mm3 of moraine deposits and increased the elevation of the basin outlet by 60–120 m. Climate change-induced glacier retreat, steep topography, and a recent strong earthquake were found to be related to the occurrence of the recent GRAs, which resulted in the formation of a knickpoint in the Yarlung Zangbo River.
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