The mechanics of dunes and antidunes in erodible-bed channels

Author:

Kennedy John F.

Abstract

An analytic model of free-surface flow over an erodible bed is developed and used to investigate the stability of the fluid-bed interface and the characteristics of the bed features. The model is based on the potential flow over a two-dimensional, moving, wavy bed with a sinusoidal profile of varying amplitude, and a sediment transport relation in which the transport rate is proportional to a power of the fluid velocity at the level of the bed. By assuming that the dominant wavelength is that for which the rate of amplitude growth is the greatest, expressions are obtained for the wavelength and velocity of the bed features. In addition, conditions for the occurrence of the different configurations, dunes, flat bed, and antidunes, are found from the model. The predicted wavelengths of antidunes and ranges of wavelengths of dunes, and the predicted conditions for change of bed configuration are found to be in good agreement with experimental data. Finally, brief consideration is given to the factors involved in determining the maximum heights of the bed features and surface waves.

Publisher

Cambridge University Press (CUP)

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics

Reference22 articles.

1. Colby, B. R. 1957 Relationship of unmeasured sediment discharge to mean velocity.Trans. Amer. Geophys. Un.,38,708–17.

2. Simons, D. B. , Richardson, E.V. & Albertson, M. L. 1961 Flume studies using medium sand (0.45 mm). Geological Survey Water-Supply Paper , no. 1498-A.U.S. Government Printing Office.

3. Tison, L. H. 1949 Origine des ondes de sable et des bancs de sable sous I'action des courants. Trans. Int. Ass. for Hyd. Structures Research , Third Meeting, Grenoble.

4. Gilbert, G. K. 1914 The transportation of debris by running water. Geological Survey Water-Supply Paper , no. 86.U.S. Government Printing Office.

5. Simons, D. B. & Richardson, E. V. 1961 Forms of bed roughness in alluvial channels.Proc. Am. Soc. Civ. Engrs, J. of Hyd. Div.,87,HY3,87–106.

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