Abstract
Before the Great East Japan Earthquake, car use for tsunami evacuation has been prohibited in principle. However, some local governments have started to examine tsunami evacuation by car since then, considering the fact that more than half of the evacuees used cars and were saved from the tsunami. Thus, in this paper important viewpoints to check the feasibility of tsunami evacuation by car were discussed, and a methodology was proposed to distinguish areas where it is difficult to evacuate on foot in expected tsunami inundation zone by defining “walking evacuation speed.” Then, two indices to the degree of evacuation difficulty are proposed; one is for evacuation on foot using the concept of needed speed for evacuation, and the other is for evacuation by car using road capacity. And specific evacuation policy design is considered with these indices. Finally, the series of the methodology suggested in this paper is experimentally applied to Aki City, Kochi Prefecture.
