A NUMERICAL STUDY OF ARMOUR BLOCK PERFORMANCE AGAINST TSUNAMI FLOWS BY DUALSPHYSICS

In 2011, the tsunami generated by the Great East Japan Earthquake damaged many coastal structures. Coastal structures should be "resilient" to external forces beyond assumption. The armour blocks are usually installed to make stable of rubble mound under breakwaters. After Tohoku tsunami disaster high rubble mound has started installed behind breakwaters to prevent overturning and armour blocks were used on the high mound. In the present study the Smoothed particle hydrodynamics (SPH) method is employed. SPH is a Lagrangian meshfree simulation method and a more applicable method to large deformation problems than mesh-based methods (Monaghan, 1992). This study calculates the behavior of armour blocks in tsunami flows by SPH model, DualSPHysics (Domínguez et al., 2022), and investigates the applicability for evaluating the performance by comparing with the hydraulic model experiments.