Development of the 2D/3D Hybrid Model for Tsunami Numerical Simulation

The 2D/3D hybrid tsunami numerical model was developed in which the conventional horizontally 2D model was adopted for the calculation in the wide region located far from the coastal structures while the 3D numerical model was used in the limited region adjacent to the structures. Applicability of the domain connection technique was examined by comparing the numerical results obtained by the present hybrid model with those obtained by applying the 3D model for the whole domain. Further, the results of the laboratory experiments were compared with the numerical results obtained by the hybrid model as well as the 2D model. It is shown that the present hybrid model reduces a calculation load significantly compared to the 3D model and is capable of reproducing the characteristics of three-dimensional and complicated flows around the structure, which cannot be reproduced by the 2D model alone.