Unified Nondimensional Formulation for Open Channel Flow

by Paul Minton, Sr. Lect.; Dept. of Civ. Engrg., Imperial Coll., London, U.K.,
Rodney J. Sobey, Res. Asst.; Dept of Civ. Engrg., Imperial Coll., London, U.K.,

Serial Information: Journal of the Hydraulics Division, 1973, Vol. 99, Issue 1, Pg. 1-12

Document Type: Journal Paper


The specific force, specific energy, and a Chezy-resistance solution for gradually varied flow in wide open channels are presented on a single nondimensional diagram with a common depth ordinate. The gradually varied flow solution appears as isopleths of length along the channel, from a specified initial depth, on axes of normal depth and flow depth. Lines on the diagram representing normal depth, critical depth, and transitional depth produce a natural division of water surface profiles into M, S, C, and H categories. The unified approach represented by this general open channel diagram should prove useful in the understanding and preliminary estimation of both rapidly and gradually varied steady flows in open channels.

Subject Headings: Open channel flow | Flow profiles | Gradually varied flow | Open channels | Water surface profiles | Steady flow

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