Experimental study on sediment transport characteristics and velocity of first hub in Yellow River Diversion Irrigation Area
NING Shaoxiong1, SUN Yaomin3, WU Wenyong2, XIAO Juan1*, ZHAO Yongan3, ZHAO Zhihua4
1. School of Hydro Science & Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 2. Yuncheng Zun Village Yellow River Irrigation Service Center, Yuncheng, Shanxi 044099, China; 3. China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 4. College of Water and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Abstract：In order to explore the variation law of sediment content and vertical distribution law of suspended sediment along the sand-carrying flow of the Yellow River diversion irrigation project, deduce the critical non silting velocity of harmful sediment suspension in the first project was calculated. The measures and methods to reduce the introduction of harmful sediment were elucidated, so as to improve the utilization efficiency of water transportation and distribution. Taking Zuncun irrigation district in Shanxi Province as the main research object, the sediment content and settling velocity were analyzed by monitoring the water samples of the Yellow River w taken from May to July 2019, the data of working conditions. section velocity, water depth and water surface width. The particle size gradation was analyzed by using the malvern Mastersizer 3000 instrument. The formulas of sand-carrying capacity and uplifting velocity applied to the first junction of Zuncun irrigation area are modified. The results show that there is a positive correlation between sediment content and inflow conditions. The sediment particle size of the Yellow River sediment in Zuncun irrigation area is mainly 0.006-0.200 mm. The siltation in Zuncun irrigation area is closely related to the velocity and particle size of the Yellow River estuary. It is suggested to increase the water delivery distance of the Yellow River estuary before the pump, control the flow rate at about 0.30 m /s, and clear the silt at the inlet. The main channel was scoured regularly at a flow velocity of >2.06 m/s. In actual operation, the working condition of single unit should be controlled at about 7.50 m3/s to reduce the introduction of harmful sediment. The flow velocity in the main channel should be controlled at about 0.42 m/s to achieve the highest water deli-very and distribution efficiency.
宁少雄,孙耀民,吴文勇,肖娟*,赵永安,赵志华. 引黄灌区首部枢纽泥沙输移特性与流速试验研究[J]. 排灌机械工程学报, 2022, 40(4): 359-365.
NING Shaoxiong,SUN Yaomin,WU Wenyong,XIAO Juan*,ZHAO Yongan,ZHAO Zhihua. Experimental study on sediment transport characteristics and velocity of first hub in Yellow River Diversion Irrigation Area. Journal of Drainage and Irrigation Machinery Engin, 2022, 40(4): 359-365.