黄河沙坡头连续弯道环流运动与冲淤特性实测数据分析

An Analysis of the Measured Data Concerning Circumfluence and Movement of Sediment in Continuous Curves in Shapotou in the Yellow River

利用声学多普勒流速剖面仪、回声测深仪等测量仪器,对黄河沙坡头段连续弯道中10个典型断面的流速、水深、河床高程等进行了实测。通过分析各断面流速等值线、平面流场和近几年河床高程的变化情况。结果表明,弯道断面流场的主流分布与河床底部泥沙冲淤分布基本相一致,满足弯道水流的一般规律:凹岸冲刷,凸岸淤积。

Some advanced equipments,such as the acoustic doppler profiler,mini-echo sounder are used to measure velocity field,water depth,and river bed height on ten typical cross sections of continuous curves in Shapotou in the Yellow River.Isoline curve of cross sections velocity,surface velocity field and river bed heights are analyzed.The experiment results show that distribution of maximum velocity accords with river bed scouring and deposition in the bend flow.Characteristics of bed load sediment transport are manifested as concave bank erosion and convex bank deposition.