Horizontal bottomed semi-cubic parabolic channel and best hydraulic section |
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| Affiliation: | 1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;2. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;3. Yangtze Estuary Hydrology and Water Resources Survey Bureau, Shanghai 200136, China;1. School of Electrical Engineering & Automation, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Process Measurement and Control, Tianjin 300072, China;1. Power Engineering Faculty, University Politehnica of Bucharest, Romania;2. Luleå University of Technology, Sweden and the Norwegian University of Science and Technology, Norway |
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| Abstract: | This paper presents a new channel section having semi-cubic parabolic sides and horizontal bottom. The formulae for calculating the area, wetted perimeter are presented. The best hydraulic section is derived using three variables (water depth, water surface width and horizontal bottom width). Results show the ratios of the water surface width to depth, bottom width to depth and water surface width to bottom are all constant for the best hydraulic section. Explicit equations of the best hydraulic section for design are also deduced. Examples show these explicit equations are convenient for design. This type of best hydraulic section is compared with the trapezoid and classic semi-cubic parabolic sections. Results indicate that the area and wetted perimeter are less than those of trapezoid and classic semi-cubic parabolic sections for a given flow discharge. It means less lining and excavation cost is required for construction. |
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| Keywords: | Channel Horizontal bottom Semi-cubic parabolic Best hydraulic section |
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