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Effect of buried plates on scour profiles downstream of hydraulic jump in open channels with horizontal and reverse bed slopes

机译:水平和反向床坡的明渠中埋板对水力跃迁下游冲刷剖面的影响

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摘要

Local scour downstream of sluice gates in erosive beds is one of the main concerns of hydraulic engineers because it can cause considerable damage to structures. Many researchers have conducted various studies to predict the maximum depth and length of scour holes and to develop new methods to control this phenomenon. In the methods that have recently been examined, embedded buried plates are used to control the scour in the erosive beds. In this study, using a physical model, the effect of buried plates in erosive beds on the depth of scour downstream of a hydraulic jump was studied. Several experiments were performed in which plates were buried at 50u0001 and 90u0001 angles at different distances from the apron in open channels with horizontal and reverse bed slopes. The results of experiments in which the scour profiles were drawn in dimensionless forms show that the angle and position of the plates are important to controlling and reducing scour depth. In fact, by reducing the angle of buried plates, the maximum depth of scour is also reduced. Also, comparison of the results of a single buried plate and double buried plates shows that using two buried plates at the distances of 30 and 45 cm from the non-erodible bed is more effective in reducing the scour depth. The best distances of the buried plates with angles of 90u0001 and 50u0001 from the non-erodible bed are 45 cm and 30 cm, respectively, in the condition with a single buried plate.
机译:侵蚀床中闸门下游的局部冲刷是水力工程师的主要考虑之一,因为它可能对结构造成相当大的破坏。许多研究人员进行了各种研究,以预测冲孔的最大深度和长度,并开发出控制这种现象的新方法。在最近检查过的方法中,使用嵌入式掩埋板来控制侵蚀床中的冲刷。在这项研究中,使用物理模型,研究了侵蚀床中埋板对水力跃迁下游冲刷深度的影响。进行了一些实验,其中在具有水平和反向床坡度的明渠中,板以50 u0001和90 u0001的角度埋入与围裙的距离不同的角度处。以无因次形式绘制冲刷轮廓的实验结果表明,板的角度和位置对于控制和减小冲刷深度很重要。实际上,通过减小掩埋板的角度,最大冲刷深度也减小了。而且,比较单个掩埋板和双重掩埋板的结果表明,在距非易蚀床30和45 cm处使用两个掩埋板在减少冲刷深度方面更有效。在具有单个掩埋板的情况下,角度为90 u0001和50 u0001的掩埋板与不可蚀床的最佳距离分别为45 cm和30 cm。

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