PROPOSAL FOR A TSUNAMI EVACUATION PLANNING METHOD THAT CONSIDERS THE DISTRIBUTION OF FLOATING SEA STRUCTURES

Abstract

 Many kinds of floating sea structures are set up in the inner bays of ria coasts. When a tsunami strikes, it is especially difficult for fishers and anglers to escape from those points back to land. We propose a tsunami evacuation planning method that considers the distribution of floating sea structures. Firstly, through analysis by aerial photographs, we ascertain the kinds of the floating sea structures and their locations. Secondly, we determine the evacuation time from a floating sea structure to the land by GIS. Finally, we classify them based on the evacuation time and tsunami arrival time. Our proposed method was applied to Minamiise Town, Mie, Japan, and showed that there are some high risk structures, especially fishing rafts. We point out the need to set a special landing point for those structures.