STUDY ON COLLISION FORCE OF TSUNAMI DUE TO DIFFERENCE OF ARRANGEMENT OF DRIFTING OBJECTS

Abstract

 At the Tohoku Tsunami in 2011, it is confirmed that drifting objects collide with buildings and structures while colliding and contacting each other. Collisions of drifting objects are factors for the expansion of damage caused by the tsunami. Damage that buildings and civil engineering structures suffer from the tsunami needs to be predicted considering not only the depth of flooding but also the influence of drifting objects. In this research, the collision forces by multiple tsunami drifting objects are obtained by hydraulic model experiments and numerical simulations. The characteristics of collision of multiple drift objects of different sizes and shapes are considered. The two-dimensional shallow water model and the tsunami drift model which is based on the DEM are used to calculate the tsunami wave force and the impact force of a drifting object.