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Brief communication: Rapid â¼ 335 x 10.sup.6 m.sup.3 bed erosion after detachment of the Sedongpu Glacier
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Brief communication: Rapid â¼ 335 x 10.sup.6 m.sup.3 bed erosion after detachment of the Sedongpu Glacier
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Journal Article
Brief communication: Rapid â¼ 335 x 10.sup.6 m.sup.3 bed erosion after detachment of the Sedongpu Glacier
2023
Overview
Following the 130 ± 5 x 10.sup.6 m.sup.3 detachment of the Sedongpu Glacier, south-eastern Tibet, in October 2018, the Sedongpu Valley, which drains into the Yarlung Tsangpo (Brahmaputra) River, underwent rapid large-volume landscape changes. Between December 2018 and 2022 and in particular during summer 2021, an enormous volume of in total ⼠335 ± 5 x 10.sup.6 m.sup.3 was eroded from the former glacier bed, forming a new canyon of up to 300 m depth, 1 km width, and almost 4 km length. The 2021 erosion peak happened through massive but still gradual retrogressive erosion into the former glacier bed. Several rock-ice avalanches of in total ⼠150 ± 5 x 10.sup.6 m.sup.3 added to the total rock, sediment, and ice volume of over 600 x 10.sup.6 m.sup.3 (0.6 km.sup.3) that has been exported from the basin since around 2017. The recent erosion volumes at Sedongpu are by order of magnitude equivalent to the average annual denudation volume of the entire Brahmaputra basin upstream of the location where the river leaves the Himalayas. This high-magnitude low-frequency event illustrates the potential for rapid post-glacial landscape evolution and associated hazards that has rarely been observed and considered at such high intensity so far.
Publisher
Copernicus GmbH
Subject
