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- Title
Characteristics of Debris Flow and Key Points of Disaster Reduction and Route Selection of China-Nepal Railway Based on Plateau Uplift Knickpoint Theory.
- Authors
MO Rongfei; HUANG Yidan; SUN Xianfeng; YAO Lingkan
- Abstract
The proposed China - Nepal Railway starts in Shigatse City, Tibet, China, and reaches Kathmandu, Nepal, through the Yaluzangbu River, Pengqu River and Gyirong Basins. It is about 600 km. About 2/3 of the length of the line is located in the Yaluzangbu River and Pengqu River Basins. The large number of debris flow gullies is a disaster type that has a controlling effect on the route scheme. Firstly, based on the river knickpoint theory of the uplift of the Qinghai-Tibet Plateau, it is determined that the Yaluzangbu River section of the China - Nepal Railway is in the early stage of geomorphic rejuvenation, and the Pengqu River section is still in the old-age geomorphic stage. Based on the phenomenon that the proportion of planation surface in the Pengqu River Basin is much larger than that in the Yaluzangbu River Basin, it is analyzed that the existence of planation surface will affect the time of surface confluence and reduce the connectivity of debris flow basin. Based on this, it is concluded that the movement conditions of debris flow in the Yaluzangbu River Basin are better than those in the Pengqu River Basin. Finally, combined with the characteristics that the riverbed of the Yaluzangbu River Basin railway will continue to rise, and there is a broad sloping zone of diluvial gravel in the piedmont of the Pengqu River Basin, it is proposed the key points of disaster-reduction route selection that the Yaluzangbu River Basin needs to improve the design elevation of the line as a whole, and the Pengqu River Basin should adopt route selection to avoid the same bank. The research of this paper can provide scientific basis for the optimization of China-Nepal railway line scheme, and the work of promoting the macroscopic theory of plateau uplift to the level of engineering application is expected to produce exemplary effect.
- Publication
Railway Standard Design, 2023, Vol 67, Issue 12, p60
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202209130002