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中文摘要：
分别采用沙量平衡法和断面法计算宁夏黄河干流和干支流交汇处的冲淤量,以刘家峡、青铜峡水库运行前（1951-1968年）、刘家峡、青铜峡水库运行后（1969-1985年）、龙刘联合运用（1986-2005年）和近期（2006-2011年）四个阶段对干流的冲淤变化进行了研究,对干支流交汇处1993-2015年历次实测大断面资料进行套绘,分析了1993-2015年干支流交汇处的断面特征变化以及干、支流不同水沙组合对干流和干支流交汇处冲淤的影响。分析结果表明：宁夏黄河干流年均来沙系数越大,干流河床淤积越严重,但支流来沙量的增大对干流河床冲淤的影响不大;干支流交汇处年均全断面冲淤量与干流年均来沙系数无明显相关关系;支流年均来沙系数越大,干支流交汇处断面反而冲刷越严重。
英文摘要：
Sediment discharge and cross-section methods are used to study the rive rsedimentation in the main stream and at the confluence respectively in the Ningxia reach of the Yellow River. Variations of erosion and deposition are studied in four different stages,before Liujiaxia and Qingtongxia reservoirs operations（ 1951-1968）,after Liujiaxia and Qingtongxia reservoirs operations（ 1969- 1985）,Longyangxia and Liujiaxia reservoirs combination operation（ 1986- 2005） and recent years（ 2006- 2011）. Variation of observed cross-sections at river confluence of main stream and tributary stream from 1993 to 2015 are studied based on observation data. Effects of runoff and sediment discharge on erosion and deposition in the main stream are analyzed.Results show that deposition in the main stream was more serious with the increase of annual incoming sediment coefficient,but the increase of sediment from the tributaries exerts little impact on erosion and deposition of riverbed in the main stream; There is no obvious correlation between annual erosion and deposition amounts of all sections in the confluence and annual income sediment coefficient of the main stream; The greater the annual income sediment coefficient from the tributaries,the more serious the river confluence scour is.
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