Boundary Shear Stress Distribution for a Two-Stage Asymmetric Compound Channel

Total resistance of a compound channel may be ascribed to channel roughness, geometry and flow characteristics and is exhibited in the form of tangential stress from point to point along the periphery, known as boundary shear stress. This paper reports the boundary shear stress distribution of compound channels with asymmetric flood plains. Due to the scarcity of data sets in asymmetric compound channel as evident from the previous literatures, wide ranges of data sets have been generated by application of SKM. New expression for predicting boundary shear distribution is found to give better results as compared to other models. Using the new expression, a modified flow prediction approach in a two-stage asymmetric compound channel has been presented. The approach has been tested with asymmetric flood channel facility experimental data, other investigators data and with natural river data sets. The efficacy of the model has been proved from the error analysis.