Bed Waves Generated by Internal Waves in Alluvial Channels
Publication: Journal of Hydraulic Engineering
Volume 115, Issue 6
Abstract
A theory has been developed to explain the generation of dunes and ripples on an erodible bed in open channel flow. The flow is conceived as a stratified flow both with respect to the velocity distribution and the density distribution of the sediment‐fluid mixture. The free internal waves that may occur in such a flow are assumed to be the triggering mechanism for the generation of dunes and ripples on an initially flat bottom. The effectiveness of the theory is demonstrated by comparing the calculated free waves with the peaks in the bed‐wave spectrum as measured at small times after starting the flow in a channel with an initially flat bed. The theory shows that dunes are generated by internal waves corresponding with the steady free‐surface waves. Ripples are due to free internal waves that only occur in flows with sediment transport. The theory has been demonstrated for bedload transport. However, an extension to any other transport mode is straightforward.
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Published In
Journal of Hydraulic Engineering
Volume 115 • Issue 6 • June 1989
Pages: 801 - 817
Copyright
Copyright © 1989 ASCE.
History
Published online: Jun 1, 1989
Published in print: Jun 1989
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