Prediction of impulse waves generated by the Wangjiashan landslide using a hybrid SPH-SWEs model

Hangsheng Ma (), Huanling Wang (), Weiya Xu (), Anchi Shi () and Wei-Chau Xie ()
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Hangsheng Ma: Hohai University
Huanling Wang: Hohai University
Weiya Xu: Hohai University
Anchi Shi: PowerChina Huadong Engineering Corporation Limited
Wei-Chau Xie: University of Waterloo

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2024, vol. 120, issue 4, No 28, 3799-3826

Abstract: Abstract A hybrid smooth particle hydrodynamics (SPH) and shallow water equations (SWEs) model is proposed to simulate landslide-generated waves in river-valley reservoirs. The generation and propagation of impulse waves are simulated using the SPH model and SWEs model, respectively. A well-designed wave generation boundary is established as an interface between the SPH and the SWEs model. The Mohr–Coulomb constitutive model is used to represent the mechanical properties of the landslide. The accuracy of the proposed model are verified by the case of the Dayantang landslide. The proposed method is then applied to predict impulse waves generated by the Wangjiashan landslide. The results show that at the normal water level of 825 m, the maximum sliding velocity is 7.30 m/s, the height of the leading wave is about 7.93 m, and the runup height at the opposite bank is about 5.32 m. The impulse wave reaches the Xiangbiling settlement with a maximum runup height about of 4.54 m, which is higher than the maximum design elevation of 827.50 m of the settlement. It is recommended that disaster risk reduction measures should be implemented in the Wangjiashan landslide. The proposed hybrid SPH-SWEs model provides an effective tool for predicting landslide-generated waves.

Keywords: Landslide-generated waves; Smooth particle hydrodynamics (SPH); Shallow water equations (SWEs); Dayantang landslide; Numerical modeling (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s11069-023-06333-y

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