Sediment Suspension with Rippled Bed
Publication: Journal of Hydraulic Engineering
Volume 109, Issue 3
Abstract
Experiments on the suspension of sediment were performed in flume with and without sediment layer on the bottom. For movable bed runs three‐dimensional sand ripples were found to affect seriously the features of suspended sediment. The horseshoe vortices and the resulting bursts in the lee of the ripples entrain intermittently a large amount of sediment into the outer layer of flow. Details of the suspension process were studied using a sand ripple model made of plaster. The result revealed that the vertical component of turbulent eddies is responsible for the suspension of sediment, and the statistical distribution of the component was found to be the Gaussian law. The statistical distribution of the concentration fluctuation was observed to be highly skewed, and the reason was determined to be the fact that the concentration increases with the power of eight against the vertical fluid velocity. The period of the intermittent ejection of sediment agreed reasonably with those reported for natural geophysical flows. Thus, the suspension of sediment in flows with rippled beds was proven to be significantly correlated with bursting phenomenon behind sand ripples.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Coleman, J. M., “Brahmaputra River‐Channel Process and Sedimentation,” Sedimentary Geology, Amsterdam, The Netherlands, Vol. 3, 1969, pp. 129–239.
2.
Daily, J. W., and Harleman, D. R. F., Fluid Dynamics, 1st ed., Addison‐Wesley Publishing Company, Inc., New York, N.Y., 1966, pp. 234–237.
3.
Jackson, R. G., “Sedimentalogical and Fluid‐Dynamic Implications of the Turbulent Bursting Phenomenon in Geophysical Flows,” Journal of Fluid Mechanics, Vol. 77, London, England, 1976, pp. 531–560.
4.
Lane, E. W., and Kalinske, A. A., “The Relation of Suspended to Bed Material in Rivers,” Transactions, American Geophysical Union, Vol. 20, 1939, pp. 637–641.
5.
Matthes, G. H., “Macroturbulence in Natural Stream Flow,” Transactions, American Geophysical Union, Vol. 28, 1947, pp. 255–262.
6.
Raudkivi, A. J., Loose Boundary Hydraulics, 2nd ed., Pergamon Press, Oxford, England, 1976, pp. 62–63.
7.
Tani, I., Fluid Mechanics, 3rd ed., Iwanami Shoten, Ltd., Tokyo, Japan, 1970, pp. 146–151 (in Japanese).
8.
Tsuchiya, A., and Hoshihata, K., “On the Suspension Mechanism of Sediment,” Proceedings of the Annual Meeting, Japan Society of Civil Engineers, Vol. 25, No. 2, 1970, pp. 251–254 (in Japanese).
9.
Vanoni, V. A., ed., Sedimentation Engineering, Manuals and Reports on Engineering Practice, No. 54, ASCE, 1975, pp. 61–91.
10.
Vanoni, V. A., “Transportation of Suspended Sediment by Water,” Transactions, ASCE, Vol. 111, Paper No. 2267, 1946, pp. 67–102.
11.
Yalin, M. S., “Geometrical Properties of Sand Waves,” Journal of the Hydraulics Division, ASCE, Vol. 90, No. HY5, May, 1964, pp. 105–119.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 109 • Issue 3 • January 1983
Pages: 409 - 423
Copyright
Copyright © 1983 ASCE.
History
Published online: Jan 1, 1983
Published in print: Jan 1983
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.