SEDIMENT MODEL FOR LANDSLIDE TSUNAMIS USING SMOOTHED PARTICLE HYDRODYNAMICS

Tsunamis can sometimes be generated by soil mass movement such as slide, slump, and sector collapse. The well-known recent events such “landslide tsunami” include Papua New Guinea tsunami in 1998, Sulawesi tsunami and Krakatau tsunami in 2018. In order to estimate how severely landslide tsunamis affect buildings and infrastructures in coastal areas, it is necessary to analyse both landslide and tsunami accurately. Many studies have been done by experiments (Wiegel, 1995; Iwasaki, 1982), empirical prediction laws (Fritz et al., 2004; Watts et al., 2005), and analytical approach (Dienkulova et al., 2010; Romano et al., 2020). Numerical models have been also developed such as the Kinematic Landslide (KLS) model (Satake, 2001) and the two-layer model (Imamura and Imteaz. 1995). The numerical models need to be further improved to obtain more accurate results. Smoothed Particle Hydrodynamics (SPH) is a particle method which was originally developed in astrophysics (Gingold and Monaghan, 1977; Lucy, 1977). Because of the Lagrangian scheme, SPH is capable of simulating multi-physics and large deformation problems. Thus, SPH is expected to be suitable for landslide tsunami simulation. This work focuses on submarine landslide tsunami and presents the implementation of the soil yield criterion for submarine landslide in SPH.