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The 2011 Tohoku earthquake tsunami caused a catastrophic disaster along the northeast coast of the Honshu Island, Japan. To deal with such massive tsunamis (identified as “level 2” tsunamis in Japan), the concept of disaster mitigation using multifaceted countermeasures is essential in addition to the construction of shore protection facilities for tsunamis at relatively high frequencies (“level 1” tsunamis). This study focused on one of such countermeasures, which involved beachside rigid structures. Such structures are expected to be effective for disaster mitigation because of the complementation of shore protection facilities by reducing tsunami force on rear buildings. To quantitatively evaluate the influence of beachside rigid structures on tsunami force, a three-dimensional (3-D) numerical analysis was performed using a 3-D coupled fluid-structure-sediment-seabed interaction model (FS3M; Nakamura and Mizutani, 2014).

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To provide a computational framework for simulating fluid-sediment-seabed interactions, a three-dimensional coupled fluid-sediment-seabed interaction model was developed and applied to seabed response under regular waves and local scouring from tsunami run-up. For the seabed response under the regular waves, the validity of the model was verified from comparison with an analytical solution. For the seabed response under the tsunami-induced local scouring, numerical results showed that the model had sufficient computational capability to simulate the seabed response during the onset of the local scouring, and suggested that the model is a useful tool for analyzing and evaluating a general complex fluid-sediment-seabed interaction phenomenon in a marine environment.
Influence of Macro-Roughness on
  • K.-J Bridges
Bridges, K.-J. (2011): Influence of Macro-Roughness on