中文摘要：

黄河宁蒙河段是黄河泥沙的主要来源区之一,也是黄河泥沙问题研究的重点河段.综合现有资料及对宁蒙河段现场监测结果,从河道形态、岸滩组成与塌岸现状以及入黄泥沙来源等角度对几个典型河段河道泥沙特性展开研究.研究成果表明,因大部分处于冲积型平原,宁蒙河段岸滩泥沙组成整体变化不大,唯支流入汇口处的岸滩泥沙组成相对复杂且受支流来沙影响大;河道摆动剧烈,塌岸现象频发;同时,沙漠段的风成沙、十大孔兑的支流入汇及以窝崩和条崩为主的塌岸等当地产沙是宁蒙河段泥沙的主要来源.

英文摘要：

The Yellow River Ningmeng River Reach, as one of the major sediment source areas in the Yellow River, is important in theYellow River sediment study. Combing field data and monitoring in the reach, sedi- ment properties of several typical reaches is studied through the analyses of channel morphology, bank compo- sition, bank erosion and sediment sources. The result shows that the bank sediment composition of the Yellow River Ningmeng River Reach varies little, for most part of the reach located on the alluvial plain. But the com- positions of the banks near the tributaries are relatively complex, influenced largely by tributary sediment in- flow. The channel swings violently and the bank failure takes place frequently. The aeolian sand, tributary sediment and bank failure greatly contribute to the high sediment input to the Yellow River.