EFFECT OF CHANNEL MEANDER ON FLOW RESISTANCE

抄録

 Understanding flow resistance is crucial for river engineers to determine the discharge capacity and to control bank erosion and the distribution of shear stress around the boundary. Flow resistance of a channel is well known to increase with the bend, or meander, due to the development of secondary flow. Although the effects of secondary flow on flow resistance are widely recognized, the characteristics of the effect itself are not yet clear. In this study, the effects of secondary flow on flow resistance were investigated quantittively by comparing various numerical calculation methods with the experimental datasets of water surface profiles in straight and meandering channels. The results show that the applied numerical calculation method is effective to evaluate the effect of secondary flow on increasing channel resistance.