Characteristics of historical debris avalanche in the Sedorongpu Basin

DOI

10.2991/978-94-6463-336-8_53How to use a DOI?

Keywords

Sedorongpu Basin; numerical simulation; debris avalanche; movement characteristics

Abstract

Because of its unique geographical environment and special climatic conditions, the Sedorongpu basin experiences frequent glacial geological hazards. This study focuses on the characteristics of a recent large-scale debris avalanche disaster (October 17, 2018) in the Sedorongpu Basin, aiming to investigate the characteristics of the debris avalanche, and the conclusions are as follows: (1) The duration of the ice-rock debris avalanche movement is approximately 500 s, with a travel distance of 1 km. During the movement, influenced by the geographical conditions, the speed of the debris flow exhibits a bimodal pattern along the course. The maximum velocity reaches 28 m/s in the initiation zone, while the second peak occurs near a tongue in the gully, with a speed of around 20 m/s. (2) The entrainment and scouring effect of the avalanche material on the gully deposits is evident and varies along the course. The upper section of the gully deposits experienced significant scouring, with a depth of up to 30 m. In contrast, the thickness variation of the lower section deposits is only about 10 m. (3) The ice-rock debris avalanche accumulates at the valley mouth, forming a dam that obstructes the main stem of the Yarlung Tsangpo River. The dam has a length of 2715 m and a height of 98 m, with a volume of 66 million m3. In summary, the model established in this study has high applicability to the Sedorongpu Basin. It can provide a reference for the inversion and prediction of similar disasters in the future.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Zonglin Tu
AU  - Zhe Chen
AU  - Xiaojiang Wang
AU  - Zhiqing Ye
AU  - Shuang Luo
PY  - 2023
DA  - 2023/12/30
TI  - Characteristics of historical debris avalanche in the Sedorongpu Basin
BT  - Proceedings of the 2023 9th International Conference on Architectural, Civil and Hydraulic Engineering (ICACHE 2023)
PB  - Atlantis Press
SP  - 453
EP  - 464
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-336-8_53
DO  - 10.2991/978-94-6463-336-8_53
ID  - Tu2023
ER  -