天桥水电站采用面流消能，原设计洪水标准为100A一遇。经本次水工整体模型试验，对100A一遇设计洪水、500A一遇校核洪水和1989年实测洪水均作了定床和动床试验研究。成果显示，100A一遇洪水和1989年洪水在建筑物下游可保持面流流态，无严重冲刷；500A一遇校核洪水则出现底流，冲坑较深，应考虑采取工程措施以改善流态，降低单宽流量。 Tianqiao Hydropower Station using surface energy dissipation, the original design flood standard for a case of 100A. After the overall hydraulic model test, a fixed bed and a movable bed experiment were conducted on a design flood of 100A, a flood of 500A and a measured flood of 1989. The results show that 100A flooding and flood in 1989 can maintain a steady flow in the downstream of buildings without severe scouring. In the case of 500A floods, underflow occurs and flood pit deepens. Engineering measures should be taken to improve flow regime , Reduce the single-wide flow.