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• W3207686373 abstract "Abstract Flow velocity is one of the most important hydrodynamic variables for both channelized (rill and gullies) and interrill erosive phenomena. The dye tracer technique to measure surface flow velocity V s is based on the measurement of the travel time of a tracer needed to cover a known distance. The measured V s must be corrected to obtain the mean flow velocity V using a factor α v = V / V s which is generally empirically deduced. The V s measurement can be influenced by the method applied to time the travel of the dye‐tracer and α v can vary in different flow conditions. Experiments were performed by a fixed bed small flume simulating a rill channel for two roughness conditions (sieved soil, gravel). The comparison between a chronometer‐based (CB) and video‐based (VB) technique to measure V s was carried out. For each slope‐discharge combination, 20 measurements of V s , characterized by a sample mean V m , were carried out. For both techniques, the frequency distributions of V s / V m resulted independent of slope and discharge. For a given technique, all measurements resulted normally distributed, with a mean equal to one, and featured by a low variability. Therefore, V m was considered representative of surface flow velocity. Regardless of roughness, the V m values obtained by the two techniques were very close and characterized by a good measurement precision. The developed analysis on α v highlighted that it is not correlated with Reynolds number for turbulent flow regime. Moreover, α v is correlated neither with the Froude number nor with channel slope. However, the analysis of the empirical frequency distributions of the correction factor demonstrated a slope effect. For each technique (CB, VB)‐roughness (soil, gravel) combination, a constant correction factor was statistically representative even if resulted in less accurate V estimations compared to those yielded by the slope‐specific correction factor." @default.
• W3207686373 created "2021-10-25" @default.
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• W3207686373 date "2021-10-01" @default.
• W3207686373 modified "2023-10-18" @default.
• W3207686373 title "Roughness effect on the correction factor of surface velocity for rill flows" @default.
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• W3207686373 doi "https://doi.org/10.1002/hyp.14407" @default.
• W3207686373 hasPublicationYear "2021" @default.
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