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Breaches of the Baige Barrier Lake: Emergency response and dam breach flood

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Abstract

This paper documents the emergency response to the breaches of the Baige Barrier Lake. The lake was successively formed by landslides that occurred on October 10th and November 3rd, 2018 at the provincial border between Sichuan and Tibet in China. The barrier lake created by the “10.10” landslide breached on October 12th and triggered a flood with a peak discharge around 10000 m3/s. The residual landslide barrier was enhanced by a second landslide on November 3rd, resulting in a higher barrier with larger flood potential. An overflow channel was excavated in the crest of the barrier to prompt the breach to be triggered at a lower water level. The second breach happened on November 12th with a measured peak discharge of 31000 m3/s. Nearly 75000 people were evacuated before the two breaches. In order to prevent the downstream dams from possible over-topping, nearly 3.27 × 108 m3 of the stored volume was released from the Liyuan reservoir 688 km downstream of Baige Barrier Lake. This paper presents the measured hydrographs and the back-analysis results for the “11.03” barrier lake. It is shown that the modern models of dam breach hydraulics can reasonably reproduce the barrier breach hydrographs; however, further studies are needed to define the key parameters which highly influence the calculated results. Knowledge acquired during the emergency response to the case can be shared with experts working on breaches of embankment dams and can be referenced to promote both the theory study and the engineering practice to mitigate the potential risks caused by this type of catastrophic events.

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Authors and Affiliations

  1. Changjiang Institute of Survey, Planning, Design and Research, Wuhan, 430010, China

    YaoJun Cai & QiGui Yang

  2. Bureau of Hydrology, Changjiang Water Resource Commission, Wuhan, 430010, China

    HaiYun Cheng

  3. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China

    ShuaiFeng Wu & ZuYu Chen

  4. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing, 100048, China

    ShuaiFeng Wu & ZuYu Chen

  5. State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an, 710048, China

    Lin Wang

  6. Changjiang Survey Institute of MWR, Wuhan, 430011, China

    YueSheng Luan

Authors
  1. YaoJun Cai
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  2. HaiYun Cheng
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  3. ShuaiFeng Wu
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  4. QiGui Yang
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  5. Lin Wang
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  7. ZuYu Chen
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Corresponding author

Correspondence to ZuYu Chen.

Additional information

This work was supported by the National Key R&D Program of China (Grant No. 2018YFC1508600).

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Cai, Y., Cheng, H., Wu, S. et al. Breaches of the Baige Barrier Lake: Emergency response and dam breach flood. Sci. China Technol. Sci. 63, 1164–1176 (2020). https://doi.org/10.1007/s11431-019-1475-y

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  • DOI: https://doi.org/10.1007/s11431-019-1475-y

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