关键词: 废黄河立交工程, 防冲减淤, 模型试验, 数值模拟, 丁坝

Abstract: Since the operation of the abandoned Yellow River interchange Project in July 1999, the scouring and silting of the river course around the culvert project has been serious, which has caused huge potential safety hazards for flood control. Aiming at the scouring and silting situation of the upstream diversion reach of the project, this paper simulated the flow pattern characteristics and the distribution of suspended sediment field of the diversion reach of the culvert project through the combination of physical model test and numerical simulation. The causes of scouring and silting of the upstream and downstream channel were analyzed, as well as the location of the main scouring and silting areas. The results showed that the weak hydrodynamic force on the left bank of the upper reaches of the culvert project was weak, causing siltation, and the fast flow rate on the right bank cause scouring phenomenon. After long-term operation, a bend flow will be formed in the upstream diversion reach. While the weak hydrodynamic force on the right bank of the downstream channel form a main silting area. After the model test, an optimum scheme of adding two spur dikes to improve the flow pattern of the river was put forward, and the experimental results showed that the improvement effect was good.

Key words: abandoned Yellow River interchange project, anti-scour and silt relief, model test, numerical simulation, spur dike