Diverted sediment causes a wide range of problems at small diversion works. The difference in water levels between low flows and floods, low investment capital and presence of cohesive sediment and fine non-cohesive sediment coupled with a requirement for a high level of supply assurance makes the design of such hydraulic structures complex. Vortex settling basins (VSBs) offer a promising alternative to conventional settling structures or hydro-cyclones. In the current study, parameters affecting the trapping of particles >75 μm were numerically investigated using ANSYS Fluent and were validated by physical modeling. It was established that the inlet velocity needs to be maintained at 0.26 m/s, the underflow to inflow ratio should be between 0.05 and 0.10, the cylinder height to cylinder diameter ratio should be greater than 0.5, and the positioning of the inlet pipe to cylinder height ratio should be greater than 0.7, with a cone of slope ratio of 2:1 (V:H) and the cylinder diameter to inlet diameter ratio should be 8.2. These parameters form the basic design guidelines for VSB use at small diversion works (<100 L/s duty capacity).

在小型引水工程中，被转移的沉积物会引起各种各样的问题。低流量和洪水之间的水位差异，低投资成本以及存在粘性沉积物和细微非粘性沉积物，再加上对高水平供应保证的要求，使得这种水力结构的设计变得复杂。涡流沉降池（VSB）提供了一种有希望的替代传统沉降结构或水力旋流器的方案。在当前的研究中，使用ANSYS Fluent对影响大于75μm的颗粒捕集的参数进行了数值研究，并通过物理建模进行了验证。已确定需要将入口速度保持在0.26 m / s，底流与流入之比应在0.05至0.10之间，气瓶高度与气瓶直径之比应大于0.5，进气管与气缸高度比的位置应大于0.7，锥度的锥度比应为2：1（V：H），气缸直径与进气口直径的比应为8.2。这些参数构成了在小型引水工程（小于100 L / s的负荷能力）下使用VSB的基本设计指南。