STUDY ON UNCERTAINTY OF TSUNAMI DEBRIS MOTION BY INITIAL ARRANGMENT UNCERTAINTY IN DRIFT MOTION

Abstract

 When a tsunami strikes, not only structures but also many people are swept away, leading to an increase in the number of missing and dead people. It is important to predict the behavior of drifted debris and the extent of drift after a tsunami in order to protect facilities and save lives. However, the drift behavior is highly variable. In this study, the effect of the initial position on the drifting behavior was experimentally investigated. The results showed that the degree of variability increases with the drifting distance, and the relation between the distance and the variability perpendicular to the drifting direction in this experiment was presented. In the numerical calculation, it was confirmed that the drift direction was in good agreement with the average of the experimental values, although there was some variability.