通过水槽试验，应用声速多普勒测速仪（ADV），研究了入汇角为30°时，支流斜接主流交汇区及其附近的三维水流结构，获得了不同主支汇流比下的三维流场及其脉动特性。试验表明：在交汇区三维流场中，产生了回流分离区，其中并伴随环流结构，大大改变了单一明渠中的流速分布及脉动特性。在入汇口下游主流右侧（入汇口一侧）水流脉动强度在z/h＝0.2处易出现极大值，其形成机理还有待验证。

The 3D flow field and turbulent characteristics of an open channel confluence at junction angle 30° with different discharge ratios are studied by means of ADV in the channel model test. The test results indicates that a discharging area and a return flow separation zone occur in the 3D flow field of the confluence region, thus resulting in greatly changing the distributions of velocity and pressure as well as turbulent characteristics in comparison with an unitary channel, and that the maximum value of fluctuating intensity occurs at the point of z/h=0.2near the right-side of releasing region of downstream confluence inlet.