Bed Characteristics in Alluvial Channel Bends

by A. Jacob Odgaard, Asst. Prof.; Inst. of Hydr. Research, The Univ.of Iowa, Iowa City, Iowa,

Serial Information: Journal of the Hydraulics Division, 1982, Vol. 108, Issue 11, Pg. 1268-1281

Document Type: Journal Paper


An approach to the description of the steady-state distributions of flow and bed characteristics in an alluvial channel bend is presented. The approach, which is based on a combination of the principle of moment-of-momentum flux and a critical-shear-stress analysis, is used to explain observed transverse variations of depth, depth-averaged velocity, and mean-grain size in a bend of the Sacramento River, California. The local transverse bed slope is found to vary linearly with d/r (the ratio of depth, d, to radius of curvature, r) and almost linearly with the bed-surface particle Froude number. It is established that the distributions of depth, depth-averaged velocity, and bed-surface sediment size depend on the variety of grain sizes in the bed sediment. Equations for the transverse variation of depth, depth-averaged velocity, and mean-grain size are developed, which can provide a guide to the depth of bed erosion and depth-averaged velocity near the outer banks of river bends.

Subject Headings: Alluvial channels | Channel bends | Fluid velocity | Velocity distribution | River and stream beds | Flow distribution | Linear functions | Sediment | California | United States

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