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Successive landsliding and damming of the Jinsha River in eastern Tibet, China: prime investigation, early warning, and emergency response

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Abstract

Two successive landslides within a month started in October 11, 2018, and dammed twice the Jinsha River at the border between Sichuan Province and Tibet in China. Both events had potential to cause catastrophic flooding that would have disrupted lives of millions and induced significant economic losses. Fortunately, prompt action by local authorities supported by the deployment of a real-time landslide early warning system allowed for quick and safe construction of a spillway to drain the dammed lake. It averted the worst scenario without loss of life and property at least one order of magnitude less to what would have been observed without quick intervention. Particularly, the early warning system was able to predict the second large-scale slope failure 24 h in advance, along with minor rock falls during the spillway construction, avoiding false alerts. This paper presents the main characteristics of both slope collapses and damming processes, and introduces the successful landslide early warning system. Furthermore, we found that the slope endured cumulative creeping displacements of > 40 m in the past decade before the first event. Twenty-five meter displacement occurred in the year immediately before. The deformation was measured by the visual interpretation of multitemporal satellite images, which agrees with the interferometry synthetic aperture radar (InSAR) measurement. If these had been done before the emergency, economic losses could have been reduced further. Therefore, our findings strengthen the case for the deployment of systematic monitoring of potential landslide sites by integrating earth observation methods (i.e., multitemporal satellite or UAV images) and in situ monitoring system as a way to reduce risk. It is expected that this success story can be replicated worldwide, contributing to make our society more resilient to landslide events.

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Acknowledgments

We want to thank the contribution of Jie Liu, Cheng Zhao, Zetao Feng, Fan Yang, Lanxin Dai, and Xiangyang Dou for supporting in data collection and field investigation.

Funding

This research is financially supported by the National Science Fund for Outstanding Young Scholars of China (Grant No. 41622206), the Funds for Creative Research Groups of China (Grant No. 41521002), the Fund for International Cooperation (NSFC-RCUK_NERC), Resilience to Earthquake-induced landslide risk in China (Grant No. 41661134010), and the fund for Team Project of Independent Research of SKLGP (Grant Nos. SKLGP2016Z001 and SKLGP2016Z002).

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Correspondence to Qiang Xu.

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Highlights

• Twin large landslides dammed the same river twice, potentially leading to catastrophic flooding that could have impacted millions downstream.

• First account of site conditions, long-term observed slope displacement, chain of events, deployed early warning system and emergency response, showing how quick and integrated action by local authorities and scientists averted a major disaster.

• The historical deformation trends of the landslide are found using satellite images taken along decades and interferometry of SAR data.

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Fan, X., Xu, Q., Alonso-Rodriguez, A. et al. Successive landsliding and damming of the Jinsha River in eastern Tibet, China: prime investigation, early warning, and emergency response. Landslides 16, 1003–1020 (2019). https://doi.org/10.1007/s10346-019-01159-x

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  • DOI: https://doi.org/10.1007/s10346-019-01159-x

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