2015
DOI: 10.1016/j.geomorph.2015.09.008
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Dimensionless critical shear stress in gravel-bed rivers

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Cited by 47 publications
(16 citation statements)
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“…It should be recalled that the total bed shear stress can be broken down into a bed shear stress component due to grain resistance, g , and a bed shear stress component due to form resistance, f . Sediment motion is generally attributed to the skin friction g and not to the total shear stress (Petit et al, 2015). To further investigate the part of bed forms in the scatter of our data and focus on grain scale, we estimate the skin friction to analyze sediment transport rate in our experiments.…”
Section: Impact Of Bed Arrangementmentioning
confidence: 99%
“…It should be recalled that the total bed shear stress can be broken down into a bed shear stress component due to grain resistance, g , and a bed shear stress component due to form resistance, f . Sediment motion is generally attributed to the skin friction g and not to the total shear stress (Petit et al, 2015). To further investigate the part of bed forms in the scatter of our data and focus on grain scale, we estimate the skin friction to analyze sediment transport rate in our experiments.…”
Section: Impact Of Bed Arrangementmentioning
confidence: 99%
“…These differences can be explained by one of the following reasons, assuming that the chosen model (Equation ) represents correctly the physical processes involved in bedload transport: (i) they are a result of the wrong estimation of the dimensionless effective bed shear stress τe, which is the only parameter controlling bedload dynamics according to the literature (Petit et al. ); with a better estimation, a difference in the ( qs,τefalse/τref) relationships should no longer be observed; or (ii) the force exerted by the flow (represented by τe) is not the only one driving the bedload dynamics; bed stability also controls directly the transport rate; or (iii) both of the previous reasons. One should keep in mind that D50 and D84 (i.e.…”
Section: Resultsmentioning
confidence: 99%
“…According to the literature, it can be assimilated into the shear stress at the grain scale τg (Einstein, ; Petit et al. ). The excess of drag due to bedforms is considered as not contributing to gravel transport.…”
Section: Methodsmentioning
confidence: 99%
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“…Critical shear stress establishes a threshold for the entrainment of particles depending on their size (D50, median diameter), with larger sizes requiring higher shear stresses for their mobilization (Powell, ). Petit et al () observed mobilization of gravels of 28 mm (D50) in the Eau Blanche River (France) with a shear stress value of 14 N/m 2 . Yet, surface‐based transport models for gravel predominant substrates by Wilcock and Crowe (), and then revised by De Linares and Belleudy (), indicate 14 N/m 2 as a reference shear stress for the mobilization of particle sizes up to 30 mm (D50, median diameter).…”
Section: Methodsmentioning
confidence: 99%