FUNDAMENTAL STUDY ON TSUNAMI BEHAVIORS BY SUBMARINE LANDSLIDE USING 2DH3D HYBRID ANALYSIS METHOD

Abstract

 In 2011, Japan suffered from the tsunami that was beyond expectations due to the Tohoku Earthquake. Therefore, it is necessary to take countermeasures against tsunamis caused by various factors including landslides. First, 2DH3D hybrid analysis method of Yoneyama et al. was applied to a simulation of the past hydraulic model experiments on tsunamis generated by landslides in order to verify its validity. As a result, this method reproduces experimental results with the same accuracy as 3D method and reduces calculation time significantly, demonstrating its effectiveness for landslide tsunami analysis. Subsequently, a numerical experiment was conducted by the same method for the purpose of selecting landslide parameters that particularly affect the tsunami wave height. As a result, it is considered that the shallower the landslide is, the higher the tsunami is. And, the results shows that the landslide mass volume has a great influence on the tsunami scale.