no19-24

[22] A relationship between residential reallocation based on living environment score and disaster risk reduction

Focusing on land slide risk, flood risk, and heavily build-up areas

○Hisatoshi Ai¹ (1. the University of Tokyo)

Keywords:Living environment score, Residential reallocation, Disaster risk, Tokyo metropolitan area

In this paper, we discuss whether residential reallocation policy based on the Living Environment Score (LES) can also reduce the disaster risk. Cross tabulation between disaster risk and population change pattern from years 2010 to 2015 shows that areas with land slide risk are losing their population while areas with flood risk or heavily build-up areas are still attracting new residents. This tendency is same even if we focus only on the areas with high LES. Spatial distributions of three types of disaster risk show different pattern which means only few areas are at high risk for two or more disaster types. Among the three types, flood risk seems to be the most important issue for city planning since areas with high flood risk are widely accumulated and are also heavily urbanized. Finally, we point out that the access to railway stations and hospitals are the key factors to reallocate population distribution to keep the living environment at a high level and to reduce disaster risk with less conflict.