A 3D multiple-relaxation-time LBM for modeling landslide-induced tsunami waves

Abstract

Landslide generated tsunami waves can trigger debris flows or floods which may lead to serious damage to civil structures and endanger life. Therefore, it is important to deeply understand such problems for disaster prevention and mitigation. In this work, a three dimensional multiple-relaxation-time Lattice-Boltzmann model (LBM) is developed for numerically investigating the landslide movement, landslide-water interaction, and water-wave generation and propagation process. We select the LBM based simulation algorithm due to its overall computational efficiency and its capability to deal with complex geometries and topologies. Both aerial and submerged rigid landslide-generated tsunami waves are simulated. The obtained numerical solutions are compared with corresponding experimental data in the literature and the results are in good agreement. It shows that the proposed LBM method is potentially an alternative tool for modeling landslide-generated tsunami waves.