中文摘要：

拟建的大柳树水利枢纽坝址位于黄河上游干流黑山峡峡谷出口处，控制黄河流域总面积的33．6％，总径流量的58％，总输沙量的10％，水多沙少，水资源开发条件优越。本文利用声学多普勒流速剖面仪、RTK和激光粒度分析仪等先进测量仪器，对黄河大柳树河段连续弯道中19个典型断面的三维流速、水深、河床高程、岸边水位、粒径等进行了实测。对黄河大柳树河段建库前的水流运动、泥沙输移、河床高程等问题进行研究。分析了各断面垂线平均流速、泥沙粒径和河床高程变化情况，并探讨了天然弯曲河道水流运动与河床冲淤变化之间的关系。结果表明，利用声学多普勒流速剖面仪能较好的测量天然河道流场、河床高程等，其测量成果可为科学管理、工程建设和运行大柳树水利枢纽提供基本资料。

英文摘要：

The Daliushu hydraulic complex is to be built at the outlet of Heishan Gorge, controlling 33.6% of the Yellow drainage, 58% of the total runoff, and 10% of the total sediment transport. This river section that carries more water and less sediment, provides a superior condition of water resources development. In this study, advanced equipments, such as acoustic Doppler profiler, RTK and laser particle size analyzer, have been adopted to measure velocity field, water depth, riverbed elevation, shore water stage, and particle size on 19 typical cross sections. The features of cross-sectional velocity, sediment transport, and riverbed deformation are analyzed to explore the relation of the flows in natural curved channels versus their riverbed evolution. It is shown that the acoustic Doppler profiler can better measure the flow field and bed elevation of a natural river. The measurements provide basic information for management, construction and operation of the Daliushu complex.