黄河天桥水电站面流消能问题探讨

Study of Issue of Surface Flow Energy Dissipation in Tianqiao Hydro -Power Station in the Yellow River

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。

surface flow energy dissipation has been applied in tianqiao hydro -power station with original design of flood Standard of once a hundred years. Floods of once a hundred years, of adjusted once five hundred years and recorded in 1989 are all studied in this hydraulic model experiments of fixed bed and movable bed. The results demonstrate that Floods of once a hundred years and 1989 can keep surface current fluid pattern without severe scour; however, flood Of once five hundred years is with bed current, deep scoured pitches, and therefore, some engineering measures Should be adopted to improve fluid pattern and decrease discharge per unit width.