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| DOI：10.13522/j.cnki.ggps.2023379 |
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| Sediment transport and sediment carrying capacity in low-pressure pipeline systems for muddy water flow |
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YANG Shaolin, JIN Jin, MA Yongyong, LAN Wenyu
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1. College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China; 2. Key Laboratory of
Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi 832000, China
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| Abstract: |
| 【Objective】Sediment deposition associated with muddy water flow in hydraulic projects is a significant concern, impacting not only longevity of the project but also its safe operation. This paper aims to explore the factors that influence sediment transport and sediment carrying capacity of water in low-pressure pipeline system for muddy water flow.【Method】The study is based on a water transportation project at Bayingou River Basin. Sediment transport and the associated sediment carrying capacity under different sediment concentrations and working pressures were studied using numerical simulations.【Result】The vertical concentration distribution of the sediment in the pipeline is affected by water pressure, volumetric sediment concentration and pipe diameter. When water pressure and pipe diameter are small, the sediment deposition thickness is in 6.3~8.0 mm. When water pressure and pipe diameter are increased, there is more sediment deposition below the Y=-0.07 area, and the sediment deposition thickness is in 8.6~9.4 mm. When the pipe diameter and water flow rate are the same, increasing sediment concentration increases the flow rate gradient, with the maximum increase being 14%. Increasing water velocity increases sediment carrying capacity of the water and the concentration of suspended load, but it reduces the suspension index gradually.【Conclusion】In low-pressure pipe network with muddy water flow, enlarging pipe diameter increases sediment concentration, whereas lowering water pressure reduces sediment carrying capacity, thereby resulting in sediment accumulation. |
| Key words: pipeline sediment transport; numerical simulation; vertical sediment mass concentration distribution; sand carrying capacity of water flow; suspension index |
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