Abstract
The Qianjiangping landslide occurred on July 13, 2003 when water level in the Three Gorges Reservoir in China reached 135 m a.s.l. for about 1 month. Thirteen people on the slope and 11 fishermen on boats in the nearby area were killed by this landslide and its wave. As a typical case, the Qianjiangping landslide is researched extensively, but the wave itself was studied much less. In this paper, a fluid–solid coupling model based on general moving objects (GMO) collision model and renormalisation group (RNG) turbulent model were employed, simplifying the sliding motion of the Qianjiangping landslide as a rigid body circular motion whose validity was verified by comparing with actual survey conditions related. Numerical simulation analysis shows that in the Qianjiangping landslide event, the solid–fluid energy-transferring rate was 5.97 %, while the motion of sliding mass could push and raise water body. The maximum-modelled wave run-up generated by the Qianjiangping landslide was 40.4 m (up to 175.4 m a.s.l.), while the maximal observed one was 39 m. It was the solitary wave, and the wave celerity was 32∼36 m/s or so. The hazardous river length of impulse wave was estimated to be 12.6 km, where wave height was more than 1 m high. The fluid–solid coupling numerical model employed by this paper can provide important reference for wave generated by other landslides around the world. Research of the landslide-generated wave is very significant in landslide hazard reduction and prevention.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (ID 41372321), the China Geological Survey (ID 1212011014027), and the National Science and Technology Support (ID 2012BAK10B01). The authors would like to thank Yu Zubing from Flow Science and Huo Zhitao from the China Geological Environmental Monitoring Institute; they are of great help for this paper. Meanwhile, when the authors participated in the emergency investigation on the Qianjiangping landslide in July 2003, Prof. Pen Xuanming, Prof. Pan Wei, and Prof. Zhang Yeming gave much help; their help is appreciated.
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Yin, Yp., Huang, B., Chen, X. et al. Numerical analysis on wave generated by the Qianjiangping landslide in Three Gorges Reservoir, China. Landslides 12, 355–364 (2015). https://doi.org/10.1007/s10346-015-0564-7
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DOI: https://doi.org/10.1007/s10346-015-0564-7