EXAMINATION FOR EVALUATION METHOD OF COLLISION PROBABILITY OF TSUNAMI DEBRIS USING NUMERICAL CALCULATION

Abstract

 In considering the secondary damage of a tsunami, it is important to consider whether a container placed in a port will collide with structures behind in the run-up tsunami wave. Therefore, we conducted a hydraulic experiment to investigate the behavior of tsunami debris due to the run-up wave. As a result, not only the run-up wave but also the reflected wave generated by the structure behind was important that we examine the drift of the tsunami debris. Therefore, we examined the influence of the impinging distance into the the reflected wave on the drift behavior by changing the initial position, initial angle, and weight of the tsunami debris. We confirmed that the impinging distance into the reflected wave had a significant effect on the impinging speed of the reflected wave, the collision speed at the reflection wall, and the probability of collision at the reflection wall. The probability of collision decreased because the impinging distance into the reflected wave increased as the distance from the initial placement of the tsunami debris to the reflection wall increased. Furthermore, when numerical calculations were used to perform analysis for a part of the experiment, the results were almost consistent with the results of the experiment.