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| Fluid-solid coupling method of landslide tsunamis and its application#br# |
| XU Wenjie |
(State Key Laboratory of Hydroscience and Hydraulic Engineering，Tsinghua University，Beijing 100084，China)
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Abstract Landslide tsunamis，as a complex type of fluid-solid coupling problems，are widespread in nature and often cause huge catastrophes. Aiming at the deficiencies in existing numerical methods of landslide tsunamis，starting from the dynamic process and physical mechanisms of landslide tsunamis and fully taking advantages of different numerical methods，the large deformation and discontinuity process of landslides and the hydrodynamic process of water were respectively simulated by using the discrete element method(DEM) and smoothed particle hydrodynamics(SPH)，and a GPU-accelerated parallel SPH-DEM coupling code，named as CoDEM，was developed to realize large-scale high-performance computing of landslide tsunami simulation. The tsunami model test of a granular landslide performed by Fahad was simulated using the developed code and the reliability of the code was verified. In the SPH-DEM coupling simulation，the ratio of the SPH particle spacing to the DEM particle size will affect the coupling accuracy and the simulation scale. Generally，the ratio less than 1/6 has a certain impact on the accuracy of the tsunami near the landslide entry point while less influence on the far field(more than 1 wavelength from the water entry point). Taking the landslide in Vajont reservoir，Italy in 1963 as an example，the 3D numerical model of the landslide and reservoir area was reconstructed，and the whole process from landslide movement，formation and transmission of tsunamis to impact on dam and floods was simulated by using the developed SPH-DEM coupling code. According to the numerical results，the final morphology of the accumulation body(similarity larger than 90%)，the maximum flood peak flow(about 350×103 m3/s) and the maximum force on the dam(about 3.9×1010 N) were compared with the previous documents，showing a good agreement. The study shows that the SPH-DEM coupling method can well simulate the dynamic process of landslide tsunamis and the developed CoDEM can provide efficient technical support for landslide disaster prevention and mitigation in reservoir areas.
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2020, Vol. 39 
