{"title":"简短交流:快速 ∼ 335 × 106 色东普冰川(西藏)剥离后的河床侵蚀","authors":"A. Kääb, L. Girod","doi":"10.5194/tc-17-2533-2023","DOIUrl":null,"url":null,"abstract":"Abstract. Following the 130 ± 5 × 106 m3 detachment of\nthe Sedongpu Glacier, south-eastern Tibet, in October 2018, the Sedongpu\nValley, which drains into the Yarlung Tsangpo (Brahmaputra) River, underwent\nrapid large-volume landscape changes. Between December 2018 and 2022 and in\nparticular during summer 2021, an enormous volume of in total\n∼ 335 ± 5 × 106 m3 was eroded from the former\nglacier bed, forming a new canyon of up to 300 m depth, 1 km width, and\nalmost 4 km length. The 2021 erosion peak happened through massive but still\ngradual retrogressive erosion into the former glacier bed. Several rock–ice\navalanches of in total ∼ 150 ± 5 × 106 m3 added\nto 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\nerosion volumes at Sedongpu are by order of magnitude equivalent to the\naverage annual denudation volume of the entire Brahmaputra basin upstream of\nthe location where the river leaves the Himalayas. This high-magnitude\nlow-frequency event illustrates the potential for rapid post-glacial landscape\nevolution and associated hazards that has rarely been observed and\nconsidered at such high intensity so far.\n","PeriodicalId":56315,"journal":{"name":"Cryosphere","volume":null,"pages":null},"PeriodicalIF":4.4000,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Brief communication: Rapid ∼ 335 × 106 m3 bed erosion after detachment of the Sedongpu Glacier (Tibet)\",\"authors\":\"A. Kääb, L. Girod\",\"doi\":\"10.5194/tc-17-2533-2023\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract. Following the 130 ± 5 × 106 m3 detachment of\\nthe Sedongpu Glacier, south-eastern Tibet, in October 2018, the Sedongpu\\nValley, which drains into the Yarlung Tsangpo (Brahmaputra) River, underwent\\nrapid large-volume landscape changes. Between December 2018 and 2022 and in\\nparticular during summer 2021, an enormous volume of in total\\n∼ 335 ± 5 × 106 m3 was eroded from the former\\nglacier bed, forming a new canyon of up to 300 m depth, 1 km width, and\\nalmost 4 km length. The 2021 erosion peak happened through massive but still\\ngradual retrogressive erosion into the former glacier bed. Several rock–ice\\navalanches of in total ∼ 150 ± 5 × 106 m3 added\\nto 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\\nerosion volumes at Sedongpu are by order of magnitude equivalent to the\\naverage annual denudation volume of the entire Brahmaputra basin upstream of\\nthe location where the river leaves the Himalayas. This high-magnitude\\nlow-frequency event illustrates the potential for rapid post-glacial landscape\\nevolution and associated hazards that has rarely been observed and\\nconsidered at such high intensity so far.\\n\",\"PeriodicalId\":56315,\"journal\":{\"name\":\"Cryosphere\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.4000,\"publicationDate\":\"2023-06-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Cryosphere\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.5194/tc-17-2533-2023\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOGRAPHY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cryosphere","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.5194/tc-17-2533-2023","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOGRAPHY, PHYSICAL","Score":null,"Total":0}
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.
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.