Journal of Geographical Sciences ›› 2021, Vol. 31 ›› Issue (11): 1694-1712.doi: 10.1007/s11442-021-1918-9

• Special Issue: Fluvial and Geomorphological Features • Previous Articles    

Flood assessment and early warning of the reoccurrence of river blockage at the Baige landslide

GAO Yunjian1(), ZHAO Siyuan1,*(), DENG Jianhui1, YU Zhiqiu1, RAHMAN Mahfuzur2   

  1. 1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China
    2. Key Lab of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China
  • Received:2020-09-15 Accepted:2021-05-27 Online:2021-11-25 Published:2022-01-25
  • Contact: ZHAO Siyuan E-mail:gaoyunjiansu@163.com;zhaosiyuan@scu.edu.cn
  • About author:Gao Yunjian (1991-), PhD Candidate, specialized in geological engineering and geological hazards. E-mail: gaoyunjiansu@163.com
  • Supported by:
    The Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0905);National Key R&D Program of China(2018YFC15050004);National Natural Science Foundation Projects(42007248)

Abstract:

On 10th Oct. and 3rd Nov. 2018, two successive landslides occurred in the Jinsha River catchment at Baige Village, Tibet Autonomous Region, China. The landslides blocked the major river and formed the barrier lake, which finally caused the huge flood disaster loss. The hillslope at Baige landslide site has been still deforming after the 2018 slidings, which is likely to fail and block the Jinsha River again in the future. Therefore the investigation of 2018 flood disaster at the Baige landslide is of a great significance to provide a classic case for flood assessment and early warning for the future disaster. The detailed survey revealed that the outstanding inundations induced bank collapse disasters upstream the Baige landslide dams, and the field investigations and hydrological simulation suggested that the downstream of the Baige landslide were seriously flooded due to the two periods of the outburst floods. On these bases, the early warning process of potential outburst floods at the Baige landslide was advised, which contains four stages: Outburst Flood Simulating Stage, Outburst Flood Forecasting Stage, Emergency Plan and Emergency Evacuation Stage. The study offers a conceptual model for the mitigation of landslides and flood disasters in the high-relief mountainous region in Tibet.

Key words: Baige landslide, outburst flood, flood assessment, flood early warning, HEC-RAS