受长江回水顶托的龙透关沱江大桥通航净空尺度的论证研究

The navigational clearance of Longtouguan bridge on Tuojiang river effected by the Yangtze River backwater

根据流滩坝枢纽坝下、沱江河口洪水位及李家湾水文站洪峰流量分析了长江回水顶托对沱江河口段水面比降的影响,采用流滩坝枢纽坝下一般受顶托影响和不受顶托影响的水位流量关系曲线和相应比降分别推求了龙透关沱江大桥受顶托影响和不受顶托影响的3 a一遇洪水位,应用二维水动力数学模型SMS对上述2种工况进行数值模拟,分析论证受长江回水顶托的龙透关沱江大桥通航净空尺度。

The impact of the Yangtze River backwater on the water surface slope of the Tuojiang river estuary is analyzed by flood levels below the Liutanba dam, flood levels of the Tuojiang river estuary and flood peak discharges of the Lijiawan hydrologicat station. The Longtouguan bridge once-every-three-years flood levels affected and non-affected by the Yangtze River backwater are calculated using corresponding stagedischarge relationship curves below the Liutanba dam and water surface slopes. The two cases are simulated by 2D hydrodynamic numerical model SMS to identify the navigational clearance of the Longtouguan bridge on the Tuojiang river effected by the Yangtze River backwater.