Abstract
The flow in a curved reach causes the bed scour near the outer bank and resulting outer bank erosion. Making the outer bank slope milder is a useful means of bank protection. In a curved channel with milder sloping of outer bank, the theoretical and experimental works are conducted aiming at the improvement of flow and bed topography. The result of calculation coincides well with that of the experimental results with regard to the structure of three dimensional flow and the bed topography, and also making the outer bank slope milder in a curved channel enables us to reduce the bed scour near the outer bank without the rise of water level.
