Abstract: Niyuna shoal is located at the upstream of Shixikou power station project.while the power station operating,velocityof Niyuan shoal and water surface slope increase,leading to boats upstream navigation hinded. Through survey and calculation, this parer gives the causes of hindering navgation the the improvemnt methods.After the practical operating,theregulated waterway obtains best economic profits.

Key words: water surface slope, water surface velocty, waterway depth, ship lock, power station

摘要： 泥渊滩位于石溪口电航枢纽的回水上段，由于电站发电用水造成泥渊滩流速和水面比降增大，船舶上行困难，形成碍航滩险．本文通过勘测和计算进行得航原因分析，经过论证提出治理措施，妥善地解决了电航之间的矛盾，获得了明显的综合效益．

关键词: 水面坡降, 表面流速, 航道水深, 船闸, 水电站