Sand-Dune Geometry of Large Rivers During Floods

by Pierre Y. Julien, (M.ASCE), Dept. of Civ. Engrg., Engrg. Res. Ctr., Colorado State Univ., Fort Collins, CO 80523,
Gerrit J. Klaassen, Delft Hydr. Lab., P.O. Box 152, 8300 AD Emmeloord, The Netherlands,

Serial Information: Issue 9, Pg. 657-663

Document Type: Journal Paper

Discussion: García Marcelo H. (See full record)
Discussion: Neill Charles R. (See full record)
Closure: (See full record)

Abstract: The geometry of lower regime bed forms in several large sand-bed rivers is investigated during average and flood conditions. The van Rijn method is revised because it generally underpredicts the dune height of most large rivers around the world. During floods in large sand-bed rivers, upper-regime plane bed is not necessarily obtained when T = 25. Both parameters describing dune height and dune steepness do not decrease as the transport-stage parameter T increases in the range 10 < T < 25. The analysis of bedform data during large floods on the Meuse River and the Rhine River branches indicates that both the dune height and length generally increase with discharge while dune steepness remains relatively constant. A reasonable approximation of the wavelength λ is λ |≅| 6.5h, where h is the flow depth. The dune height Δ varies as a function of the depth h and median grain size d50. Estimates can be obtained by Δ ≅ 2.5h 0.7 d50.³.

Subject Headings: Floods | Dunes | Geometrics | Sand (hydraulic) | Sandy soils | Rivers and streams | Bed materials | Parameters (statistics) | Bed forms | Rhine River

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