山区弯道水流特性及消能选型

Study on Characteristics and Energy Dissipation of Mountainous Bend Flow

山区弯道水流特性复杂,消能工布置困难,为确定其适宜的消能工型式,分析了山区河流水流特性及工程中常用消能型式,并结合水工模型试验研究了不同消能工布置下弯道水流流态及消力池出口流速分布,提出在弯道出口处设置消力池加辅助消能工(消力墩+异形坝)的工程措施。结果表明,在消力池内设置消力墩和异形坝后,水流流态得到很好的改善,出池水流流速分布均匀,消能效果更好。

Owing to complex flow property of mountainous bend river, it is difficult to arrange dissipator. In order to design suitable dissipater type, this paper analyzes flow characteristics of mountainous river and common type of energy dissipation in project. Combined with hydraulic model test, it has been studied that flow regime of bend flow, as well as velocity distribution in different scheme of energy dissipation. The engineering method of stilling basin with auxiliary dis- sipater （such as baffle block and heteromorphous dam） at bend flow outlet is proposed. The results show that the flow re- gime is obviously improved and flow velocity distribution is uniform, as well as the effect of energy dissipation is better.