简短交流:快速 ∼  335  ×  106 色东普冰川(西藏)剥离后的河床侵蚀

IF 4.4 2区 地球科学 Q1 GEOGRAPHY, PHYSICAL Cryosphere Pub Date : 2023-06-28 DOI:10.5194/tc-17-2533-2023
A. Kääb, L. Girod
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引用次数: 2

摘要

摘要130之后 ± 5. × 106 2018年10月,西藏东南部色东普冰川的m3分离,流入雅鲁藏布江的色东普河谷发生了大量景观变化。2018年12月至2022年,尤其是2021年夏季 335 ± 5. × 106 m3被前冰川床侵蚀,形成了一个高达300米的新峡谷 m深度,1 km宽,最多4 公里长。2021年的侵蚀高峰发生在对前冰川床的大规模但仍然缓慢的倒退侵蚀中。总共发生了几次~ 150 ± 5. × 106 m3加上超过600的岩石、沉积物和冰的总体积 × 106 m3(0.6 km3),自2017年左右以来一直从该盆地出口。Sedongpu的再剥蚀量在数量级上相当于河流离开喜马拉雅山脉位置上游整个布拉马普特拉盆地的年平均剥蚀量。这一高震级低频率事件说明了冰川后景观快速演变的潜力和相关危害,迄今为止,在如此高的强度下很少观察到和考虑到这些危害。
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Brief communication: Rapid  ∼  335  ×  106 m3 bed erosion after detachment of the Sedongpu Glacier (Tibet)
Abstract. Following the 130 ± 5 × 106 m3 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 ∼ 335 ± 5 × 106 m3 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 ∼ 150 ± 5 × 106 m3 added to the total rock, sediment, and ice volume of over 600 × 106 m3 (0.6 km3) 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.
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来源期刊
Cryosphere
Cryosphere GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.70
自引率
17.30%
发文量
240
审稿时长
4-8 weeks
期刊介绍: The Cryosphere (TC) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies. The main subject areas are the following: ice sheets and glaciers; planetary ice bodies; permafrost and seasonally frozen ground; seasonal snow cover; sea ice; river and lake ice; remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.
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