2024 Volume 80 Issue 17 Article ID: 24-17062
Numerous studies have attempted to reproduce mountain body collapse phenomena such as the 2018 Krakatau tsunami using two-layer flow models and water surface profiles obtained from simplified estimation equations. However, these approaches fail to accurately depict the generation of tsunamis characterized by relatively short periods and a dispersive component caused by underwater progression of mountain body collapse. In this research, we conducted a reproducibility evaluation of the dispersive component employing a three-dimensional multiphase flow model for the source area and a two-dimensional planar analysis for the coastal area. Considering that a solution for the dispersive wave component cannot be obtained when using a nonlinear long wave model, dispersion was accounted for in the three-dimensional multiphase flow model. To confirm the impact of dispersive waves on reproducibility, we conducted studies using both a nonlinear long wave model and a dispersive wave model in wide-area calculations employing horizontal two-dimension analysis. The results of this study showed that dispersive waves have minimal influence on trace reproducibility.
