Author(s): Mario Isaac Schreider; Mario Luis Amsler

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Abstract: A study of bedforms steepness in alluvial streams during the low flow regime is reported in this paper. By means of an empirical approach two main results were found: a. The use of the dimensionless grain shear stress, τ′ adequately represents sediment transport intensity and, therefore, the observed evolution of bedform steepness. The adoption of the total bed shear stress τ′ instead of, r[, as independent variable, results in a spurious one to one relationship that lumps together points of equal steepness but quite different stages of dune evolution. b. An empirical relationship for the prediction of dune steepness when the viscous effects can not be neglected (Re′* < ≈ 12, h/d s > ≈ 100). The maximum value of steepness in this case is lower compared to the widely known for hydraulic rough bed H/λ ≈ 0.06.

DOI: https://doi.org/10.1080/00221689209498904

Year: 1992