Local flow field and scour near the water intake project between spur dikes

In combining with a water intake project in Ningxia section of Yellow River, the flow field and local scour and deposition deformation features around the project shielded by the spur dikes were investigated using undistorted movable-bed physical model. The results showed that the local flow pattern and scour near the project were mainly conducted by the backflow between spur dikes and the diffusing mainstream. Under the current conditions, the flow pattern in the front of water intake structure is free of backflow, and the back silting sediment does not endanger the safety of water intake, but the diffusing mainstream rushes the project and results in serious local scour. When up-oriented submerged type diversion facilities are added, the local scour can be greatly reduced. The optimizing configuration and orientation angler of diversion facilities were obtained. Extending the up spur dam in a reasonable manner can achieve a more favorable flow condition for water intake, so that rushing was alleviated and local scour was diminished. These results can provide reference for the design of similar engineering.