Abstract: Yong-an hydro-power station is a key water control project, which has multipurposes both in power and navigation. This paper studies sediment movement and shape of eraded riverbed before and after the project is built. By comparing the model test with the built project, the authorities to solve different problems about sedimentproof regulation of the channel, reasonable arrangement of navigation constructions and some engineering measures about preventing sediment and inproving navigation conditions. The key project was built 5 years ago, it has been proved that these engineering measures of the project are quite successful.

Key words: sediment, navigation, hydro-power

摘要： 永安水电站是一个发电和通航并举的综合利用水利枢纽工程,本文分析了枢纽兴建前后工程河段的水沙运动和河床冲淤形态。并结合模型试验和枢纽建成后的运用情况,探讨了枢纽引水防沙,上下游河道治理,通航建筑物合理布置,以及改善枢纽防沙和通航条件的工程措施。枢纽建成5年来,运转证明这些工程措施是成功的。

关键词: 泥沙, 航运, 水力发电站