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https://doi.org/10.1016/j.flowmeasinst.2018.11.013
Copy DOIJournal: Flow Measurement and Instrumentation | Publication Date: Nov 14, 2018 |
Citations: 1 |
A Two-stage compound channel section is commonly used in ecological channel design. This paper presents the geometric properties of the compound section and the formulae for calculating the cross-section area, wetted perimeter are obtained. Then, the explicit equations of the best hydraulic section for design are derived. Results show the best width-depth ratio of the compound section is related to some geometric parameters. Furthermore, this type of best hydraulic section is compared with the rectangular and trapezoidal sections. Results indicate that the cross-section area and wetted perimeter are less than those of rectangular and trapezoidal sections for a given flow discharge when the ratios of the compound section's roughness coefficient to those of rectangular and trapezoidal sections are less than 1.017 and 0.855, respectively. It means less lining and excavation cost is required for construction.
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