2025 年 13 巻 2 号 論文ID: 24-16103
Present study analyzed damages resulting from the 2014 flood as well as from the potential floods with the magnitudes of 10 years to 200 years return period. In particular, focusing on the 2014 flood, data necessary for formulating damage functions were collected by means of field surveys in addition to numerical simulation. Such surveys realized that the channel erosion caused loss of areas and agriculture areas covered by deposited sediment required some years to recover the normal situation before the event. Based on these results, the damage functions are formulated for houses and community areas, and for agricultural areas. Then, applying the formulated damage functions to the potential flood hazards which were obtained from the numerical simulations on different flood events with the magnitudes ranging 10 years to 200 years return periods, we evaluated the potential damages resulting from such floods events for houses, community areas and agricultural areas and found that the damage caused by land loss due to erosion was largest and the damage resulting from sediment deposition was second largest in all land uses.
