宁夏黄河干流和干支流交汇处河床冲淤演变分析

发布时间：2018-04-10 05:34

本文选题：宁夏黄河　切入点：干流　出处：《泥沙研究》2016年04期

【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。
[Abstract]:The sediment balance method and cross-section method were used to calculate the scour and deposition volume at the junction of the main and tributaries of the Yellow River in Ningxia. Before the operation of the Liujiaxia and Qingtongxia reservoirs, the amount of scour and siltation was calculated in the Liujiaxia and Qingtongxia reservoirs from 1951 to 1968, respectively.After operation of Qingtongxia Reservoir (1969-1985), Long-Liu combined use (1986-2005) and recent "2006-2011"), the change of scour and siltation of the main stream was studied, and the major cross-section data of the junction of the trunk and tributaries from 1993 to 2015 were set up.The change of cross section characteristics of the main tributaries from 1993 to 2015 and the influence of different combination of water and sediment on the erosion and deposition of the main stream and the main tributaries are analyzed.The results show that the greater the annual sediment coefficient of the main stream of the Yellow River in Ningxia, the more serious the deposition of the main stream bed, but the increase of the amount of sediment coming from the tributaries has little effect on the erosion and deposition of the river bed of the main stream.There is no obvious correlation between the average annual scour and siltation amount of the whole section of the main tributaries and the average annual sediment coefficient of the main stream, but the greater the average annual sediment coefficient of the tributaries, the more serious the erosion of the cross sections of the tributaries.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金创新研究群体科学基金资助项目(51321065)
【分类号】：TV147

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