Abstract
The topographical structure of Japan is vulnerable to natural disaster and we aim to minimize damage by combining infrastructure maintenance, disaster mitigation land-use planning and crisis management measures to flood caused by global warming. As a result of a large-scale disaster, designation of disaster potential areas such as sediment-related disasters and tsunami disasters have actively been carried out. But designation of disaster potential areas of flood damage is not actively carried out. After heavy precipitation event occurred for 8 to 10 September 2015, in Joso city, setting of disaster potential areas of flood damage were set up only along river. Considering the uncertainty of the flood disaster prevention plan, it is necessary to set the area of the entire basin. But a clear method has not been established. In this study, we aim to establish a setting method of disaster potential areas of flood disaster covering the entire basin. First, we investigated the relative flood risk of residential areas in lower Shinano basin. As a result, the residential areas with low flood risk are developed as a residential area preferentially and most of these areas have been developed. Then we investigated the continuity of future residential area development. As a result, it is speculated that vacant house countermeasures and house remodeling will progress in residential areas. Based on the results so far, it is found that it is possible to design disaster potential areas throughout the basin, when residential area survival rate with low flood risk and estimated number of households are known. By designing disaster potential areas by the above method, it is expected that flood disaster will be mitigated.
