Steepness of Sedimentary Dunes

by Mehmet Selim Yalin, (M.ASCE), Prof.; Dept. of Civ. Engrg., Queen's Univ., Kingston, Ontario, Canada,
Emin Karahan, (M.ASCE), Asst. Prof.; Dept. of Civ. Engrg., Tech. Univ., Istanbul, Turkey; formerly, Post-Doctoral Fellow, Queen's Univ., Kingston, Ontario, Canada,

Serial Information: Journal of the Hydraulics Division, 1979, Vol. 105, Issue 4, Pg. 381-392

Document Type: Journal Paper

Discussion: Jaeggi Martin N.R. (See full record)
Discussion: Gill Mohammad Akram (See full record)
Discussion: Wilson Kenneth C. (See full record)
Discussion: Fredsoe Jorgen (See full record)
Closure: (See full record)


A family of curves is determined for the prediction of the steepness of dunes generated by rivers and open channel flows by using field and laboratory data from various sources. The dune steepness appears to be determined by two dimensionless variables: the ratio of the existing bed shear stress to the shear stress inducing the inception of sediment transport, and the ratio of the flow depth to the grain size of sediment. It has been found that with the increment of the former variable the dune steepness first increases, then reaches its maximum value and then progressively decreases as to vanish asymptotically. The increment of the second variable causes only the increment of the dune steepness up to a certain upper limit. The curves forming the family are normalized as to merge into a single curve which is formulated in an exponential form.

Subject Headings: Sediment | Dunes | Shear stress | Curvature | Sediment transport | Shear flow | Open channel flow | Hydrologic data | River flow

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