NEW ESTIMATION METHOD OF ESTIMATING DISCHARGE, ROUGHNESS COEFFICIENTS, BED LEVEL AND SEDIMENT DISCHARGE USING TIME CHANGES OF WATER SURFACE PROFILE

Abstract

 In this study, a new method for estimating the flow discharge, roughness coefficient, riverbed level, and sediment discharge based on the temporal variations of the water surface profile was constructed. The method is based on the 1D shallow water and continuity equation for the sediment discharge and is used to estimate the flow discharge, roughness coefficient, bed level, and sediment discharge with roughness and riverbed convergence calculations. Since small-scale riverbed configuration changes the resistance of a river during floods, the method is verified against experimental data on sand waves such as dune I, dune II, transition I, and flatbed. This shows that the present estimation method can reproduce the flow discharge, roughness coefficient, average bed level, and sediment discharge although there are still some problems in reproducing local bed levels and roughness coefficients.