2024 Volume 80 Issue 17 Article ID: 24-17051
There is limited knowledge on the appropriate coupling position between the two-dimensional model (2D) and the three-dimensional model (3D) of the 2D/3D hybrid tsunami analysis method, in which the water level and flow rate are transferred in both directions when a 2D model is used for a wide area and a 3D model is used for the land area and around the structure. In this study, simulations of existing hydraulic model experiments were conducted with and without the dispersion term in the 2D of the hybrid model, varying the coupling position. As a result, it was confirmed that the change of tsunami waveform due to dispersion affects the reproducibility of tsunami after the coupling to the 3D model. In addition, the coupling position of the hybrid model was investigated to reproduce the tsunami run-up in Onagawa town by the 2011 Tohoku tsunami, and the comparison with the run-up height records of the tsunami, inundation depth and flow velocity were verified. As a result, it was estimated that the hybrid model can reproduce the tsunami run-up on land with the consideration of structures better than the 2D model.
