At-A-Site Mountain River Flow Resistance Variation

by James C. Bathurst, Univ of Newcastle upon Tyne, Newcastle upon Tyne, United Kingdom,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


At-a-site variation in flow resistance is examined in the light of observations of an S-shaped velocity profile at relative submergences (d/D84) greater than 1. Factors controlling the development of the profile (slope and bed material size distribution) are found also to affect the resistance variation but available data are insufficient to enable the variations for individual sites to be collapsed into one general relationship. The familiar semilogarithmic relationship is found to overestimate resistance significantly at high flows.

Subject Headings: Bed materials | Flow measurement | Flow resistance | Submerged flow | Streamflow | Flow profiles | River flow | Hydraulic models

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