洪水流による河口砂州フラッシュの新しい解析法に関する研究

抄録

The river mouth bars in the Aganogawa River estuary extend toward the center of river from both banks. The sandbar causes the discharge capacity to decrease and the water level to rise. Therefore, it is important to understand flushing mechanism of river mouth sandbar during a flood event. The authors’ studies on river floods showed that the flow and bed variation during a flood could be explained by means of a suitable numerical analysis method using temporal changes in observed water surface profiles and. The objective this paper is to clarify the extension process of channel through the river mouth by the quasi-three dimensional analysis coupled with bed variation analysis, which is capable of estimating the bottom velocity and the non-hydrostatic pressure distributions of flows.