CONSTRUCTION OF DECISION SUPPORT SYSTEM FOR TSUNAMI EVACUATION BASED ON TSUNAMI SCENARIO BANK

Abstract

 As a countermeasure for reducing tsunami damage, it is necessary to consider evacuation support and evacuation actions based on tsunami arrival time. Many recent tsunami evacuation assistances only have showed the inundation area, information of evacuation site, and shortest route to evacuation sites. However, safety of routes to evacuation shelters based on the estimated inundation range and estimated tsunami arrival time has not been considered.

 Based on the earthquake information, we searched scenarios from the tsunami database that tsunami simulation results are accumulated. Then, we extracted a scenario based on search range, magnitude and estimated tsunami arrival time. We constructed an evacuation route search method to avoid tsunami encounter considering the tsunami arrival time on the evacuation route of the extracted scenario.

 We then examined the effectiveness of our proposed method at Katsuura City, Chiba Prefecture. As a result, when evacuation was started both before and after the arrival time of the tsunami, the mortality rate was reduced by selecting the route which doesn’t encounter tsunami. This implies the effectiveness of our proposed evacuation support method which can provide a safe evacuation route.