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Analysis on the influence of sediment discharge facilities of Haikou Control Project of Xinyi River on sediment deposition

LIU Bao;Jiangsu Huaishuxinhe Management Office;  
In order to study the influencing factors of dredging and sedimentation of the Xinyi River Haikou Control Engineering Sediment Discharge Channel Project, the characteristics of water and sediment under the influence of flow factors and structural factors are designed and carried out. There is a negative correlation between discharge parameters and sediment concentration. For every 1.5 L/s increase in flow rate, the sediment concentration at the downstream of Shenhong Sluice and at the end of the sediment discharge facilities can be reduced by 6.2% and9.3%; Only by controlling the flow at the sea inlet can the impact of sediment deposition be prevented. The larger the particle size of the sediment, the higher the sediment concentration; the control of the particle size of the sediment will help to affect the movement of the sediment and change its suspension-settling relationship. There is a positive correlation between water level and velocity, but the velocity level at the downstream of Shenhong sluice is higher than that in the middle of the sediment discharge channel, and the difference between them is 27.5%~47.6%. The higher the design height of the sand discharge plate, the higher the flow velocity. The sensitivity of the flow velocity at the downstream of the gate is higher than that at the end of the channel. The results can provide some reference for the design optimization and impact analysis of sediment discharge and dredging engineering.
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