Analysis of the Change of Diversion Capacity of the Diversion Culvert and Sluice in the Lower Yellow River Irrigation Area
Due to the factors such as riverbed incision and changes in river regime,the downstream Yellow River diversion culvert gates have undergone changes in water diversion conditions compared to the design,resulting in difficulties in water diversion for some river sections of the culvert gates and affecting timely agricultural irrigation and production development.In order to provide reference for addressing the issue of declining water diversion capacity of Yellow River diversion culvert gates,based on the measured water level and river section data of the Yellow River diversion culvert gates from 2000 to 2016,the impact of the factors such as changes in water level,channel erosion and sedi-mentation in the Yellow River diversion channel on the water diversion capacity of the Yellow River diversion culvert gates was analyzed.The results show that a)when the Yellow River inflow is 300-900 m3/s in 2016,the actual diversion capacity of the Yellow River diversion cul-vert gates in the lower reaches of the Yellow River is only 13.63%-39.43%of the designed diversion capacity,and the diversion capacity of the Yellow River diversion culvert gates has significantly decreased.b)Compared to 2000,the design value of the Yellow River diversion culvert gate in 2016 corresponds to the water level of the Yellow River flow,the river section above Gaocun has decreased by 2.95-3.35 m,and the river section below Gaocun has decreased by 1.55-2.95 m.c)From the average erosion thickness of the riverbed in the river section,the erosion thicknesses of Huayuankou-Jiahetan,Jiahetan-Gaocun,Gaocun-Sunkou,Sunkou-Aishan,Aishan-Luokou and Luokou-Lijin sec-tions are 3.88,3.06,1.84,1.88,1.88 and 2.02 meters respectively.The continuous erosion of the river channel leads to a significant de-crease in the water level at the same flow rate,seriously affecting the normal water diversion of the Yellow River diversion culvert gate in Henan and Shandong sections.d)The siltation in the front and back culvert gates will reduce the diversion capacity of Yellow River diversion sluices.
culvert and sluicediversion capacitydiversion water levelriver channel erosionLower Yellow River
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