2021 Volume 77 Issue 2 Pages I_133-I_138
In order to investigate the process of the human model being caught in the tsunami-derived vortex, and to clarify the force induced by the vortex and the necessary buoyancy to resist the vortex, a large vortex caused by a solitary wave was reproduced inside a large wave flume. As a result, followings were clarified. 1) When a tsunami (solitary wave) with a wave height of 0.2 to 0.5 m acted on the human model, the human model was caught in the vortex behind the concrete block and pulled into the depths. 2) The centripetal force and buoyancy force acting on the human model were calculated from the rotation radius and angular velocity of the vortex, and 3) the human model wearing a life jacket floated on the sea surface. 4) When rotating around an axis perpendicular to the axis of the body, the centrifugal forces act on the hands, the legs and head with a maximum acceleration of 12 m/s2 (1.2 G) in a tsunami with a wave height of 0.5 m.
