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• W4387227523 endingPage "104571" @default.
• W4387227523 startingPage "104571" @default.
• W4387227523 abstract "There is a paradox in the relationship between bedload transport rates and flow variables: laboratory and field studies have reported on how bedload transport rates depend on flow variables through a power law, but none of the empirical laws fitted to the data has managed to provide accurate predictions of bedload transport over a wide range of flow conditions. Inferring bedload transport's scaling behavior from data has remained a stubborn problem because the data are very noisy. It is, therefore, difficult to progress on this problem without some informed speculation about how bedload and flow interact. Ralph Bagnold proposed an original theory to resolve this problem. This paper reviews and updates Bagnold's model by separating the effects of flow resistance and efficiency (energy transfer from water to bedload) on dimensionless transport rates Φ. Both variables' contributions to transport rates can be parameterized separately for the three transport regimes that Bagnold defined (no transport, transitional, and sheet flow). We also consider two possible control variables: the dimensionless Shield stress τ∗ and a dimensionless number related to stream power. In the transitional regime, the dimensionless bedload transport rate scales as Φ∝τ∗3, whereas in the sheet-flow regime, it varies as Φ∝τ∗5/3. We end up with two Bagnold equations: one based on physical principles and involving Shields stress τ∗, flow resistance f, a density ratio, and a bed slope; the other based on non-linear regression and stream power. Compared to a large set of laboratory and field data, predictions from Bagnold's model show reasonable accuracy when the bed is plane." @default.
• W4387227523 created "2023-10-01" @default.
• W4387227523 creator A5068591474 @default.
• W4387227523 creator A5087158929 @default.
• W4387227523 date "2023-11-01" @default.
• W4387227523 modified "2023-10-16" @default.
• W4387227523 title "Scaling behavior of bedload transport: what if Bagnold was right?" @default.
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