Large-Scale Roughness in Open-Channel Flow

by John B. Herbich,
Sam Shulits,

Serial Information: Journal of the Hydraulics Division, 1964, Vol. 90, Issue 6, Pg. 203-230

Document Type: Journal Paper


A new method of predicting resistance to flow in open channels with large roughness elements is proposed. The roughness elements investigated consisted of 6-in. and 3.75-in. cubes; these were arranged in a variety of symmetric and random patterns. The majority of patterns used 6-in. cubes and one random pattern included both 6-in. and 3.75-in. cubes. It was found that systematic relationships do exist among the Manning's n, Reynolds Number, Froude Number, and a special quantitative parameter of the roughness pattern.

Subject Headings: Hydraulic roughness | Open channels | Open channel flow | Flow resistance | Load and resistance factor design | Symmetry | Reynolds number | Froude number

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