According to the measurement principle and technological requirements of the multibeam system,along with the characteristics of the water sediment conditions and river bed topographic of the wandering Lower Yellow River,the bed morphology of Huayuankou section in the Lower Yellow River were surveyed by using differential GPS for positioning and navigation and using R2SONIC for depth measurement from June to July in 2016. The river bed morphology of an area of 5 km long and 50 m wide within the main channel were surveyed for four times with the flow discharge ranging from 800 to 1200 m3/s. The results show that the data processed by the software has relative high preci?sion. The three dimensional bed morphology figure of the channel of the Lower Yellow River can be built based on the data,which presents the immediacy of the characteristics of the bed morphology. The data formed a foundation the research on the bed resistance and sediment transport capacity of the Lower Yellow River. The bed morphology of Huayuanhou section is a multiple dune. There is a large scale dune with wave length of 800 m to 1000 m,wave height of 3 m and small scale dunes overlap the large one.%根据R2SONIC多波束测深系统的测量原理及测量技术要求,结合黄河下游游荡型河道的水沙及地形特点,采用差分GPS定位导航、R2SONIC水深测量,于2016年6—7月开展了黄河下游花园口河段的河床形态测量,取得了主河槽内长5 km、宽50 m的观测带在河道流量为800~1200 m3/s时的河床床面形态数据.结果表明:采集的数据经软件后处理后能够达到较高的精度,可以给出黄河下游床面形态的三维立体图形,直观反映床面形态特征,同时为黄河下游动床阻力及输沙能力的研究提供基础数据;花园口河段床面形态为复式沙垄,即存在一个波长800~1200 m、波高3 m左右的一个大沙垄,其他小沙垄附着在大沙垄上.
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