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https://hdl.handle.net/11681/10696| 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 Roughness Two-dimensional flow Frictional resistance Hydrodynamics |
| 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. |
| URI: | http://hdl.handle.net/11681/10696 |
| Appears in Collections: | Miscellaneous Paper |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| MP-H-68-5.pdf | 9.59 MB | Adobe PDF |  View/Open |