Formation of Dunes and Antidunes in Open Channels

by Taizo Hayashi, (F.ASCE), Visiting Prof.; Inst. of Hydr. Res., Univ. of Iowa, Iowa City; at present, Prof. of Hydr., Chuo Univ., Tokyo, Japan,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 2, Pg. 357-366

Document Type: Journal Paper


The formation of dunes and antidunes on the erodible bed of an open channel is studied analytically as a problem of stability of the erodible bed. The phase lag existing between the local sediment-transport rate and the local velocity on the bed plays an essential role in the formation of the sand waves. A physical model for the transport of sediment over a wavy bed is presented and a quantitative explanation of this phase lag is developed. The regions of occurrence of dunes of those bed configurations are compared with experimental results previously summarized by Kennedy, the comparison showing a good agreement.

Subject Headings: Dunes | Sediment transport | Erosion | Wave velocity | Bed materials | Sand waves | Channel stabilization | Open channels

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