中文摘要：

为满足灌溉要求，引黄灌区渠道沿程通常设置不同形式的分水涵闸进行分流。渠道分水分沙机理及分流对渠道原有输沙能力的影响研究是灌区系统水沙资源优化配置的基础。在分流水流流态已有研究成果的基础上，利用含沙量垂线分布理论公式，推导得到渠道自流分流时分沙比与分流比呈0．9次幂关系式，并利用灌区引水含沙量与大河含沙量的统计数据进行了验证。此外，根据建立的分沙比关系式进一步分析了分流条件下保持渠道原有输沙能力的临界条件，说明了渠道分流通常会增加原渠道的淤积，进而在分沙比关系式及输沙能力公式的基础上建立了渠道淤积比与分流比的关系式，经数值分析可知淤积比随着分流比的增大先增大后减小。

英文摘要：

The abstracted water combined with lots sediment from the Yellow River is usually divided into lower-grades channels in different direction in irrigation area. The theory of sediment laden discharge diversion is the basis of the water and sediment allocation. Based on the a- chievement of flow patterns on local part of diversion, the sediment diversion ratio was derived and validated by field data. Furth more, under the affection of diversion along the main channel, the critical conditions of sediment transport capacity and the deposition ratio of the main channel were studied. The results show that the sediment diversion ratio is a power of 0.9 function relation with water diversion; in normal condition, diversion water will enhance sediment deposition, and the deposition ratio is growing firstly to the maximal value and then going down with the diversion ratio.