Effect of water surface slope and friction slope on the value of the estimated Manning’s roughness coefficient in gravel-bed streams

Abstract

The aim of the study was to assess the possibility of using the empirical formulas to determine the roughness coefficient in gravel-bed streams, the bed slopes of which range from 0.006 to 0.047. Another aim was to determine the impact of taking into account the conditions of non-uniform flow on the application of these formulas and to develop the correlation relationships between the roughness coefficient and water surface slope and also between the roughness coefficient and friction slope in order to estimate the roughness coefficient n in gravel-bed streams.

Keywords

• roughness coefficient
• bed slope
• uniform flow
• non-uniform flow