Influence of diversion angle on water and sediment flow into diversion channel |
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| Institution: | 1. Department of Dams and Water Resources, College of Engineering, University of Mosul, Mosul, Iraq;2. Department of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang, Selangor, 43400, Malaysia;3. Department of Water Resources Engineering, University of Baghdad, Baghdad, Iraq;1. Center of Computational Energy, Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran;2. Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Iran;3. Aalto University, Marine Technology, Espoo, Finland;1. Department of Civil Engineering, College of Engineering & Applied Sciences, Stony Brook University, Stony Brook, NY, USA;2. Department of Civil and Environmental Engineering, Hanyang University, Seoul, South Korea;1. Department of Civil Engineering, National Defense Academy, Japan;2. Université Grenoble Alpes, Laboratoire 3SR (sols, Solides, Structures, Risques), UMR 5521, Domaine Universitaire, BP53, France;1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (SKL-WAC), Beijing 100048, China;2. China Institute of Water Resources and Hydropower Research (IWHR), Beijing 100048, China;3. Institute of Disaster Prevention, Beijing 101601, China;1. State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;2. Joint-Sponsored State Key Laboratory of Plateau Ecology and Agriculture, QingHai University, Xining 810016, China;3. Center for Coastal Resource Management, Virginia Institute of Marine Science, 1375 Greate Road, P.O. Box 1346, Gloucester Point, VA 23062, USA;4. Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China;5. Water Resources Department, Changjiang River Scientific Research Institute, Wuhan 430010, China |
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| Abstract: | Accumulation of the sediment in the stream of the diversion channels adversely affects its operational systems. Diversion channels are often constructed perpendicular to the main river. In this study, the water flow and sediment transport in the diversion channel with different angles were investigated in an attempt to maximize water discharge and minimize sediment discharge. A physical model with movable bed was used to simulate water and sediment flow with five diversion angles (θ) between (30°–90°). Moreover, three bed width ratios (Br) (the relation between diversion to main channel bed width) between 30% and 50% and five total discharges between (7.25 L/s to 12.25 L/s) were considered for each case of (θ). The results showed, up to 10%, increasing in proportion discharge ratios for 30 and 45 diversion angles compared with 90° diversion angle. The results also showed that the lowest diversion sediment concentration was provided by the (θ) of 30°. Across all scenarios, the average proportion concentration reduction was 64%, compared with 90° diversion angle. Closer observation of the diversion system mechanism confirmed that decreased (θ) result in decreased sediment concentrations in the diversion channels. In conclusion, the diversion channel water and sediment discharge could be effectively managed by changing the (θ) to 30° or 45° instead of 90°. |
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| Keywords: | Diversion channel Diversion angle Lowest diversion sediment concentration Bed width ratio Sediment concentration |
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