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Title: Boundary effects of uniform size roughness elements in two-dimensional flow in open channels
Authors: United States. Assistant Secretary of the Army (R & D)
Brown, Bobby J.
Chu, Yen-Hsi.
Keywords: Boundary layer flow
Channel flow
Open-channel flow
Two-dimensional flow
Frictional resistance
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; H-68-5.
Description: Miscellaneous Paper
Abstract: Tests were conducted to investigate the characteristics of the vertical velocity distribution in flow in wide channels with large relative roughness. The study was basically a two-dimensional investigation of the boundary roughness effects in turbulent flow. The investigation was conducted in a 48-ft-long, 2-1/2-ft-wide flume with 1/8-, 1/2-, 3/4-, and 1-in. crushed limestone and 3/4-in. concrete cubes as the boundary roughness. Results indicate that the root-mean-square value σ of the boundary roughness heights is related to the Nikuradse equivalent sand grain roughness k𝗌 and that the root-mean-square value can be treated as a roughness parameter for boundaries of densely spaced, irregular, randomly placed roughness elements of uniform size. Appendix A includes the experimental data. Appendix B describes the special instrumentation used for measuring the vertical velocity profiles within the flow.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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