Effect of a submerged bay-mouth breakwater on tsunami behavior analyzed by 2D/3D hybrid model simulation |
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| Authors: | Koji Fujima |
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| Institution: | (1) Department of Civil and Environmental Engineering, National Defense Academy, Yokosuka 239-8686, Japan |
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| Abstract: | The hybrid numerical model had been developed to simulate a complicated 3D flow around structures generated by tsunami. In
the model, the conventional 2D model is adopted for the wide region far from structures and the 3D non-hydrostatic pressure
model is used in the limited region adjacent to structures. The applicability of the model is shown by comparisons of the
numerical results with the experimental results of the laboratory model tests and the numerical analysis results of the conventional
whole 2D simulation. In addition, the effect of a submerged structure at the opening of a breakwater is discussed from the
numerical simulations by the hybrid model. The submerged structure improves the stability of the rubble mound and reduces
the tsunami inflow into the bay, while it increases the water surface velocity around the opening of the breakwater. The increase
of surface velocity causes the increases of impulsive forces by collision with drafts and so on. |
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| Keywords: | Tsunami 3D model Hybrid model Tsunami breakwater Wave force Bottom shear stress |
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