进口型式对碾盘山导流明渠水力特性的影响

为解决碾盘山导流明渠出现的波浪、回流等不利流态及渠内发生冲刷破坏等问题,通过物理模型试验研究了进口型式对导流明渠水力特性的影响。研究结果表明,与河道衔接顺直的明渠进口,减小了进口轴线与原河道的夹角,增加了明渠的进口宽度,使明渠水流流态明显改善,渠内死水区域面积减小,进而有效避免了回流的产生;同时,顺直的明渠进口可降低水流流速,减小水面波动,降低明渠发生冲刷破坏的可能性。该结论可为类似工程提供参考。

Effect of Inlet Type on Hydraulic Characteristics of Nianpanshan Open Channel

In order to solve the occurrence of the fluctuation and back flow as well as the water erosion damages occurrence in Nianpanshan diversion open channel, the impacts of the inlet patterns on the hydraulic characteristics of diversion channel are studied with physical model tests. Research results show that the straight arrangement at the inlet of the channel reduces the included angle between the open channel and the original river channel, increases the width of the diversion inlet, and significantly improves the flow regimes of the upstream wrapped head and the open channel, and the occurrence of back flow in the channel is effectively avoided. Meanwhile, the straight arrangement of the inlet is capable of lowering the flow velocity and water surface fluctuation, which reduces the probability of erosion damage of the open channel. This paper can provide a useful reference for similar projects.