小挑坎在导流隧洞出口消能中的应用

针对山区河道导流隧洞出口布置消能措施空间有限的问题,采用物理模型试验,对比研究了预留岩埂、消力墩、连续坎与差动坎四种不同布置方案的消能效果,通过对比不同方案下导流隧洞出口水流流态、流速、冲刷等水力学指标,最终确定连续坎方案为最优方案。水面线和水流流态对比结果表明,该方案增大了水流的横向扩散,优化了水流衔接流态,大幅减小了水流衔接段单宽流量,进而降低了下游岸边流速,减小了下游河床冲刷。

Application of Small Flip Bucket in Energy Dissipation of Diversion Tunnel Outlet

In order to solve the problem of energy dissipation at the outlet of the diversion tunnel which layout space is limited, the physical model test was used to compare the energy dissipation effects of four different schemes, reserving rock bank, dissipating piers, continuous ridges and differential ridges. By comparing hydraulic parameters such as the flow pattern, flow velocity and scouring at the outlet of diversion tunnel under different schemes, the continuous ridge scheme is finally determined as the optimal scheme. The comparisons of water surface lines and flow patterns show that the scheme increased the horizontal spread of water flow, optimized the water flow convergence, and reduces the single width flow of water convergence section greatly, thereby reducing the downstream bank flow rate and the downstream riverbed erosion.