ABSTRACT
Prediction of stage-discharge relationship in a river section is required in several river hydraulic problems such as intake designs, flood protection, bank protection, navigation, and sediment transport-depositional patterns etc. Flow of a channel for a given stage is mainly dependent on the resistance for that particular depth only. The resistance is generated by grain roughness and form roughness, and depends on sinuosity, stage, slope and geometry. Due to complex flow phenomenon occurring in a meandering channel, roughness coefficient are not constant but found to be depending upon many non-dimensional hydraulic, surface and geometric parameters. An experimental Investigation has been carried out to find the dependency of roughness coefficients with respect to geometric and hydraulic parameters like Aspect ratio, Slope, Sinuosity, Reynolds no, and Froude’s no. A Regression analysis has also been carried out to formulate a mathematical model to predict Manning’s n of a meandering channel of higher sinuosity. It is seen that, the model gives better prediction result not only to the present experimental highly sinuous meandering channel data sets but also the data sets of other investigation.
