Prediction of friction factor and stage–discharge relationship in alluvial streams

Abstract

Development of predictors for frictional resistance in an alluvial channel is a challenging task because of the complex interaction of fluid, flow and sediment in the channel bed. In the present study, an effort has been made to develop a functional relationship for friction factor using relevant fluid, flow and sediment parameters. Using field data (years 1984–2002) and the said functional relationship, a predictor for friction factor is proposed for mobile boundary channels. Proposed predictors for friction factor and cross-sectional properties of a gauging station (Sarangkheda, Tapi River, India), in turn, have been used to develop stage–discharge relationship for the same station. The proposed relationship for friction factor and rating curve developed at the Sarangkheda gauging station has been validated using available independent data for years 2003–2007.

Keywords:

• alluvial river
• friction factor
• functional relationship
• stage–discharge

Acknowledgements

The authors are thankful to the Executive Engineer, Central Water Commission, Tapi Division, Surat, without whose help it would not be possible to complete the present study.