洪水時のヨシ群落の力学的特性を考慮した河道水理検討手法に関する考察

—庄内川におけるH12, 9月洪水の再現を通して—

抄録

In September of 2000, the Shonai river was attacked by the Tokai storm, which reached the recorded maximum scale, and a design channel for the Shonai river was needed to be planed reflecting the channel characteristics. In determining this design channel, channel characteristics such as roughness coefficient of high-water channel and boundary mixing coefficient are established through reproduction of the September 2000 flood, the discharge capacity of the present channel is appropriately estimated bas ed on these channel characteristics, and conservation of the downstream reed field is considered from an environmental point of view.

With this examination, through reproduction of the flood from the river which has large scale high-water channel where reed community is thick, the necessity of using the up-to-date knowledge for establishing the coefficient of roughness of high-water channel is described, as well as the rational setting method of boundary mixing coefficient between a low-water channel and a high-water channel is studied.