通过理论分析，结合模型试验，对处于弯道上的低水头拦河闸闸前的水流特性、闸孔的分流比及其影响因素进行了研究，探讨了闸孔分流比的计算方法。结果表明，由于枢纽对闸前水流的影响，使得闸前弯道水面横比降、纵比降显著减小，纵向垂线平均流速横向分布趋于均匀化。河槽总流量和枢纽轴线与弯道进口断面的夹角对闸孔分流比的影响较小。靠近凸岸的边孔泄流能力较弱，其余各闸孔分流较均匀。闸孔分流比的计算结果较为满意。这些对于保证闸址选择、水闸设计的经济性、安全性具有很重要的意义。

Based on the theoretical analysis and model experiment, the behavior of flow in front of the sluice gate, flow diversion ratio of a low head sluice built in the curved channel and its factors were analyzed, calculations of flow diversion ratio coefficient were discussed. The results show that due to the influence of sluice on the flow, the transverse and longitudinal gradients of the water surface decrease remarkably, the transverse distribution of the depth-averaged longitudinal velocity tends to be nearly uniform. The impact of the total flow and the angle between sluice axis and inlet plane of curved channel on flow diversion ratio of a low head sluice is small. Discharge capacity of the gate-hole near convex bank is small, those of other gate-holes are much uniform. Flow diversion ratio coefficients by calculation were satisfactory. These results are very important for the selection, location, design, security and economy of sluices.