常願寺川現地実験水路における河岸防護工近傍の流れの三次元構造と河岸に作用する流体力の評価

抄録

At flow attacking points against bank protection works in the steep rivers, local three-dimensional flows and free-surface spatial-temporal fluctuations cause river bed scouring and bank erosion. Three- dimensional flow structures and free-surface fluctuations are important to understand river bed scouring and bank erosion against bank protection works in steep rivers.

In this study, we have two objectives. First, we show structures of three-dimensional flows and free- surface fluctuations against flow attacking points by using the computation results of the General Bottom Velocity Computation method. Second, we show the evaluation method of forces brought by three- dimensional flows around gravel river bank. As a result, forces of three-dimensional flows and free- surface fluctuations are clarified in relation to bank erosions, and the forces on gravel river bank are evaluated by the vector sum of bottom pressure gradient and bottom shear stress.