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August 17, 2025Civil Engineering JournalOpen Access

Alternative Method for Determining Manning's Roughness Coefficient Using Two-Point Velocity in Equilibrium and Nonequilibrium Sediment Transport

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This study evaluates the effects of sediment transport on Manning's roughness coefficient, indicating new methods using velocity profiles.

The composite manning's roughness coefficient is influenced by sediment transport, leading to higher values during sediment-feeding flows.
Sediment-feeding flows show 33.01% differences in the roughness coefficient compared to 14.80% in non-sediment-feeding flows.
An acoustic doppler velocimeter was utilized to measure velocity profiles for 1200 sediment feeding and non-feeding flow conditions.
Findings suggest that nz/B represents nco effectively at z/B = 0.2 from the channel sidewall, highlighting sediment's role in flow resistance.

Maini et al. (2025) studied this question.

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This study evaluates the effects of sediment transport on Manning's roughness coefficient, indicating new methods using velocity profiles.