Effects of the Longitudinal Arrangement of the Gentler Bank Slope on the Flow

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 gentler is a useful means of bank protection. By numerical works, we studied the improvement of flow and bed topography in straight channels and meandering channels with gentler sloping of bank. The result of calculation shows that water level depends on the width to depth ratio in the single section channel with gentler slope, and that making the slope gentler does not induce the rise of water level in the composite channel. Making the outer bank slope gentler in the meandering channel enable us to reduce the bed scour near the outer bank without the rise of water level.