Removal of sediments from dam reservoirs is an important task for water resources management. The pressurized flushing is a more common way for the evacuation of sediments. The present study experimentally investigates a case of a single pile installed upstream of the orifice to improve the pressurized flushing efficiency. In this regard, five pile cross-section configurations, namely circular, face-on square, corner-on square, corner-on triangular, and side-on triangular, were studied here. The piles were placed at four different distances (4.9, 8.4, 11.9, and 15.4 cm) upstream of the orifice. The results showed that the piles were the most effective when installed with a minimum distance. Furthermore, the flushing cone expanded in volume by increasing the output discharge. The highest increase in the flushing cone volume (671% relative to the control configuration without pile) at a fixed discharge rate was obtained with the corner-on triangular pile. The second highest expansion of the flushing cone volume (362% relative to the control configuration) was obtained with the face-on square pile. Furthermore, at 57% higher than the control case, the circular pile realized the least increase in the flushing cone volume.

从大坝水库清除沉积物是水资源管理的重要任务。加压冲洗是疏散沉积物的更常用方法。本研究通过实验研究了在孔口上游安装单桩以提高加压冲洗效率的情况。在这方面，这里研究了五个桩的横截面构造，即圆形，面朝正方形，对角正方形，对角三角形和对边三角形。将桩放在孔上游四个不同的距离（4.9、8.4、11.9和15.4厘米）处。结果表明，在以最小距离安装时，桩是最有效的。此外，冲洗锥的体积通过增加输出流量而扩大。使用角形三角形桩时，在固定的排放速率下，冲洗锥体积的最大增加量（相对于无桩的控制配置，为671％）达到最高。正面朝上的方形桩获得了冲洗锥体积的第二高膨胀值（相对于控制配置为362％）。此外，圆形桩比冲洗箱高出57％，实现了冲洗锥体积最小的增长。