Abstract Landslide tsunamis represent a highly complex fluid-solid interaction process and this complexity is one of the challenges in researching landslide disasters. Given the characteristics of landslide tsunamis, a coupled smoothed particle hydrodynamics (SPH)-discrete element method (DEM) code was developed and applied to simulate the process in this study. Based on the laboratory experiment that Fahad (2010) carried out on the tsunami process produced by granular slides, numerical tests with the same conditions as the experiment were performed. Except for a small influence on the infiltration of water into the pores in the slide in the generation area of the tsunami, the ratio of 1/6 of the DEM particle diameter to the scale of the SPH particles is better for simulating landslide tsunamis based on the SPH-DEM coupling method. According to the numerical results of the tsunamis generated by five types of slides with the same geometry and weight, the slide type significantly affects the tsunami characteristics. During the transition from the slope toe to the bottom of the water tank, different slide type exhibit different changes in the slide geometry, resulting in significant differences in energy loss, transfer of kinetic energy from the slide to the water, and the water-entry volume of the slide, which in turn affect the behavior of the tsunami. As a whole, under the same conditions, the speed and amplitude of the initial tsunami generated by a granular slide are lower than those generated by a blocky slide, with a blocky slide composed of four blocks generating the highest tsunami speed and amplitude.

中文翻译：

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使用3D SPH-DEM耦合方法模拟和验证滑坡海啸

摘要 滑坡海啸是一个高度复杂的流固耦合过程，这种复杂性是滑坡灾害研究面临的挑战之一。鉴于滑坡海啸的特点，在本研究中开发了耦合平滑粒子流体动力学 (SPH)-离散元方法 (DEM) 代码并应用于模拟该过程。基于 Fahad (2010) 对颗粒滑坡产生的海啸过程进行的实验室实验，进行了与实验相同条件的数值试验。除了对海啸发生区滑坡孔隙中水的入渗影响较小外，DEM 粒径与 SPH 颗粒尺度的 1/6 比值更适合于模拟滑坡海啸。 SPH-DEM 耦合方法。根据5种几何形状和重量相同的滑梯所产生的海啸数值结果，滑梯类型对海啸特征有显着影响。在从坡趾到水箱底部的过渡过程中，不同的滑道类型在滑道几何形状上表现出不同的变化，导致能量损失、滑道向水中的动能传递和进水量的显着差异。幻灯片的体积，这反过来影响海啸的行为。整体来看，在相同条件下，颗粒滑坡产生的初始海啸速度和幅度低于块状滑坡，其中由四个块组成的块状滑坡产生的海啸速度和幅度最高。