Landslides

, Volume 13, Issue 3, pp 603–616 | Cite as

Risk management study on impulse waves generated by Hongyanzi landslide in Three Gorges Reservoir of China on June 24, 2015

Recent Landslides
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Abstract

On June 24, 2015, Hongyanzi slope located in Wushan County of the Three Gorges Reservoir collapsed, generating 5–6-m-high impulse waves, which overturned 13 boats, killed 2 persons, and injured 4 persons. It is the second incident of landslide-generated impulse waves since the 175-m experimental impoundment in 2008. The emergency investigation shows that Hongyanzi landslide is a bedding soil landslide with a volume of 23 × 104 m3 induced by a series of triggering factors such as rainfall, flooding upstream, and reservoir drawdown. The nonlinear Boussinesq water wave model is used to reproduce the impulse waves generated by the landslide of June 24th. The numerical simulation results suggest that the wave propagation process was influenced by the T-shaped geomorphic conditions of river valley, and the coastal areas in the county seat were the major wave-affected areas, which is opposite to the landslide. The numerical wave process accord well with the observed incident, and the investigation values were in good agreement with the calculated values. Moreover, the worst-case scenario of the 7 × 104 m3 deformation mass beside Hongyanzi landslide is potential to generate impulse waves, which was predicted with the same numerical model. This adjacent deformation mass will probably generate impulse waves with maximum height and run-up of 2.2 and 2.0 m, respectively, and only a very few areas in the water course had waves rising to a height of 1 m or above. The research results provide a technical basis for emergency disposal to Hongyanzi landslide and navigation restriction in Wushan waterway. More importantly, it pushes the risk management of the navigation based on the impulse wave generated by landslide. It is advised that the Three Gorges Reservoir and other reservoirs around the world should put more efforts in performing special surveys and studies on the potential hazards associated with landslide-generated impulse waves.

Keywords

The Three Gorges Reservoir Hongyanzi landslide Impulse wave risk management Nonlinear Boussinesq model 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (ID 41372321) and the China Geological Survey (ID 1212011014027). The authors would like to thank Ma Fei from the Office of Three Gorges Geohazard Management of Chongqi City and Huo Zhitao from the Command of Geohazard Prevention of Three Gorges Reservoir; they are of great help in the emergency investigation and analysis. Finally, we want to thank Dr. Philip Watts who helped us register for GEOWAVE and helped us much in using GEOWAVE.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Wuhan Centre of China Geological SurveyWuhanChina
  2. 2.China Institute for Geo-Environment MonitoringBeijingChina
  3. 3.Chongqing Institute of geological disaster prevention and controlChongqingChina

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