August 15, 2025Hydrological ProcessesOpen Access

Influence of Soil Grain Roughness and Roughness Type on Flow Resistance in Rectangular Rill Channels

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Discussion

Experimental analysis reveals flow resistance variation in rectangular channels due to soil roughness and roughness type.

Flow resistance is mainly influenced by roughness type rather than soil grain roughness, indicating a distinct impact on erosional modeling.
Laboratory measurements showed an approximate ±1% restraint in flow resistance related to soil grain roughness in specific setups.
Analysis utilized rectangular flumes with various surfaces, incorporating both experimental measurements and literature data.
Results suggest that understanding roughness type can enhance modeling efforts in upland erosion processes under varying hydraulic conditions.

Lucchese et al. (2025) studied this question.

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