Session6: Water-related Disaster Risk Reduction
Title: A STUDY ON SAFE EVACUATION FROM INUNDATED UNDERGROUND MALL BY A MULTI-AGENT MODEL
Yutaro Nakasaka, Taisuke Ishigaki, Ryuji Kawanaka
In recent years, underground spaces have been used to make effective use of limited land in large cities. In particular, the convenience and comfort of living have been improved by using a large under-ground space where subways and underground malls have been connected each other. On the other hand, it is dangerous to stay there when a disaster occurs, and to do safe and quick evacuations is an important measure for disaster prevention. For example, in recent years, the number of heavy rainfalls has increased due to climate change, and in urban underground spaces, such as underground mall, subway stations and basements, are prone to inundations caused by pluvial and fluvial flood. The safe evacuation plan from the underground space is necessary to make in order to minimize flood damage. However, it is difficult to examine the evacuation behavior of people in a large enclosed space by experiments such as evacuation drills because of the huge cost. In this study, a multi-agent model was used to simulate the evacuation behavior of users in the underground space before an inundation occurs, and the evacuation time was figured out. Moreover, the critical lines of safe evacuation time are created by using the inundation data in the underground space when flooding occurs. This study also compared how long the evacuation time and the critical lines of safe evacuation time and found the factor to improve the success rate of evacuation. The results would be useful to make an evacuation plan.