江の川下流部における水害防備林の倒伏に関する一考察

抄録

Because the lower reach of Gounokawa River has low population and assets, a river improvement security level is lower than the upper reaches. Therefore, it becomes important to utilize the river improvement effect of flood defense forests. On the other hand, the water depth of floods is large, and velocity in the flood defense forests is early, it may lodge and flows out. We evaluated a river improvement effect of the flood defense forests quantitatively and examined an activation method of the flood defense forests. However, we do not consider the risks such as lodging or the outflow of the flood defense forests at the time of the large-scale flood. In this study, the lodging situation of the flood defense forests was evaluated quantitatively using a 2-D shallow-water flow model. In addition, we assumed the lodging situation of the flood defense forests at the time of the large-scale flood and considered difference in flood plain velocity.