Author(s): Yanjie Liang; Juan Jing
Keywords: Yellow river estuary; Xihekou; Stable river regime; Small bend scheme
Abstract: There are only a few river channel regulation projects below Yuwain Yellow River estuary, and the control projects cannot play an effective control role and the river is unstable, the swing of the flow path is unfavorable to the development of the estuary area. At present, there are two schemes for river regulation near the Xihekou: "big bend" and "small bend". The "big bend" plan is formed by the combination of the Cuijiazhuang and the Xihekou control projects located in the left bank, forming a big bend. The "small bend" plan is from Cuijiazhuangcontrol projectin the left bank to Weigaizhacontrol project in the right bank and then to the Xihekou control project. The 2D mathematical model was used to simulate the flow patterns of the 24.4km section from Yuwa to Qing3 near the Xihekou under three different inflow conditions of 1,000m 3 /s, 4,000m 3 /s and 10,000m 3 /s. The results showed that the control effect of Weigaizhaproject was not obvious when the flow rate was 1000m 3 /s. At 10,000m 3 /s, the water in the Xihekou were not able to slide well. At 4000m 3 /s, the projects can control the water flow effectively. By the four cross sections of different flow velocity distribution arbitrage and river mainstream lines comparison, the characteristics of cross section velocity distribution under different inflow conditions and its adaptability to river regulation are analyzed. When the flow rate is 4000m 3 /s, the main stream of the river fits with the "small bend " schemecontrol traverse, which is favorable for controlling the river flow. Considering the inflow and sediment situation of the Yellow River estuary, the small bend scheme is more suitable for medium and small flood, and also is conducive to the water diversion of Shengli oilfield in the Xihekou.