EVALUATION OF ECONOMIC LOSS FROM FLOODING BY CONSIDERING FUTURE DEPOPULATION AND VARIATIONS IN URBAN STRUCTURE

Abstract

 Using multiple rainfalls from numerical weather simulations considering the global warming, inundation simulations were implemented for the Kakehashi River basin, Ishikawa, Japan. Then, economic losses were estimated based on the maximum inundation depth estimated by the simulations. In the evaluation of economic loss, future variations of population distribution caused by depopulation were considered. At the same time, variations of economic losses were investigated by considering possible changes in urban structure caused by the depopulation in the target area. Under depopulation condition, the economic losses diminishes in residential district. When people relocated from the higher inundation risk areas to the lower risk area, 40 % of the original economic losses would be diminished at the maximum relocation ratio.