Abstract
The big wave suddenly arrived at the beach, Niigata prefecture Japan in May 2014. And three children were carried off to the sea by the wave, though they played on the beach. When the accident occurred, the significant wave heights was 1.2m, and the wave period was 7.9 seconds. The beach characteristic topography has the cusp topography and steep slope. We tried to understand the reason why this accident occurred. Firstly, we reproduced the wave condition when the accident occurred. Secondary, we made the survey to understand the geographic feature of the beach. After the survey, we obtained the geographic data for the numerical simulation from the aerial photograph which were taken by UAV (Unmanned aerial vehicle). Finally, we comprehended the wave dynamics on the beach by the numerical simulation. We simulated the wave dynamics by the horizontal two dimensional numerical model and the vertical two dimensional numerical model.
Highlights
The accident that three children and two adult males who tried to rescue the children died occurred at Jogehama beach Japan in 2014
Our group reproduced the wave run up condition by the numerical simulation, and comprehended about the wave run up speed and the water level
The wave run up distance at Jogehama was about 26m (Fig.7), at Ajirohama was about 9m.According to the above results, the water level, the velocity and the run up distance decreased less than Ajirohama
Summary
The big wave suddenly invaded to the beach, and three children were carried off to the sea by the wave though they played on the beach. The beach characteristic topography has the cusp topography and steep slope. This study tried to comprehend the reason why this accident occurred. This study comprehended the wave condition when the accident occurred. This study made the survey about the geographic feature of the beach. This study obtained the geographic data for the numerical simulation from the aerial photograph which were taken by Drone. This study comprehended the wave dynamics on the beach by the numerical simulation. This study simulated the wave dynamics by the horizontal two dimensional numerical model and the vertical two dimensional numerical model
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