Sedimentation in dam reservoirs causes problems such as reducing storage volume and useful life of reservoirs, reducing the volume of flood control, sluices, tunnels, and turbines clogged, and other related issues. Despite the development of several methods to solve this problem, the sedimentation rate of the world’s dam reservoirs indicates the existence of this problem. The Hydrosuction Sediment Removal System discharges sediments inside the dam reservoir using the energy caused by the difference in water level in the reservoir and the output point of the system. This study is aimed to investigate the effect of geometric properties of the hydrosuction system (effective head, suction pipe diameter, and suction pipe inlet angle) on its performance and to understand the flow characteristics and behaviors in the hydrosuction dredging operation. Quantitative comparison of the results revealed that, with the increase in the suction pipe diameter from 478 to 956, the growth of the effective head from 21 × 10³ to 34 × 10³, and the increase in the suction pipe inlet angle from 30º to 90º, the maximum diameter and depth of the scour hole increased by 103% and 275%, 22% and 49%, and 38% and 50%, respectively. At the beginning of the desilting process by the hydrosuction system, seepage flow through deposits removed sediment particles and, along with the scour hole dimensions development, it reduced the effect of this flow type. Irregular vortexes were observed in the final stages of the desilting process. These vortexes caused limited development in the scour hole.

大坝水库的泥沙淤积会引起诸如减少水库蓄水量和水库使用寿命，减少防洪，水闸，隧道和水轮机堵塞等问题，以及其他相关问题。尽管已开发出多种方法来解决此问题，但世界大坝水库的沉积速率表明存在该问题。抽水泥沙清除系统利用水库中水位和系统输出点之间的差异所产生的能量将大坝水库内部的沉积物排出。这项研究旨在研究抽水系统的几何特性（有效扬程，吸水管直径和吸水管入口角）对其性能的影响，并了解抽水疏ed操作中的流量特性和行为。³至34×10 ³，并且吸水管进口角从30º增加到90º，冲孔的最大直径和深度分别增加了103％和275％，22％和49％，38％和50％ ， 分别。在通过吸水系统进行的除沙过程开始时，通过沉积物的渗流将去除沉积物颗粒，并且随着冲刷孔尺寸的增加，它会减小这种流动类型的影响。在除泥过程的最后阶段观察到不规则的涡旋。这些涡流在冲刷孔中造成了有限的发展。