EFFECTS OF BUILDINGS IN FLOOD INUDATION SIMULATION AND PROPOSAL OF HAZARD VISUALIZATION IN THREE CATEGORIES

Abstract

 The purpose of this study is to examine the potentially high risk zones where the horizontal evacuation of the living people would be required before and during the flood inundation situations. In order for that, the effects of the buildings in flood inundation simulations on the results with the derived horizontal evacuation zones were evaluated based on the flood inundation simulations in this study. The flood inundation simulation was applied to the Chikuma River, which was flooded by the heavy rains of Typhoon No. 19 in 2019, and several methods taking account for the buildings in the flood inundation simulation are examined. In addition, flood inundation simulation considering buildings and risk classifications are applied to the Jinzu River in Toyama Prefecture, and vertical and horizontal evacuation zones are evaluated. As a result, the horizontal evacuation zones in Toyama city was successfuly evaluated. In addition, we proposed a hazard visualization method in 3 categories including inundation damage prevention areas.