中文摘要：

针对新型二级沙水分离设施-圆中环沉沙排沙池，采用模型试验方法测试其清水流速环向分布。研究表明：“圆中环”中心出水环不加高工况整体流速环向呈现不均匀分布，135°～225°范围流速较大。“圆中环”中心出水环加高9cm工况整体流速分布较均匀，但中心出水环过高，造成上游进水渠水位升高并增加工程量及投资。试验证明：“圆中环”中心出水环适当加高可提高沉沙效率，设计过程中，中心出水环加高后顶高程不宜超过溢流堰顶高程。

英文摘要：

The model test method is applied to simulate the velocity in the ring direction of circular rings desilting and sediment ejection basin which is a new water and sediment separation device .The research shows that the distribution of velocity is non-uniform in the ring direction of “circular rings”by not heightening the central outflow ring .Distribution of velocity is larger in the range of 135°- 225° of “circular rings” .The more uniform distribution of velocity by 9cm heightening of central outflow rings in the “circular rings” ,but the phenomenon of the higher of upriver water level and increasing quantities and investment exists by heightening central outflow ring too much .The experiment shows that the high desilting efficiency obtained by properly heightening central outflow rings .In engineering design ,the heightening of central outflow ring top elevation should not exceed the top elevation of overflow weirs .