黄河下游非漫滩高含沙洪水的沿程淤积分布

发布时间：2019-04-28 07:37

【摘要】：小浪底水库即将由拦沙初期转入拦沙后期,水库降水排沙会使黄河下游河道发生不同程度的淤积,给维持下游一定过流规模的主槽带来困难。通过对比4个不同含沙量与泥沙级配方案下游河道的冲淤量及泥沙沿程淤积情况,认为:1含沙量低且悬沙粒径细的非漫滩高含沙洪水在黄河下游河道淤积量相对较少,且各河段淤积较为均衡;2非漫滩高含沙洪水含沙量沿程调整迅速,含沙量越高,衰减幅度越大,中粗沙含量沿程明显减少,细沙含量沿程衰减得少;34个方案均以中粗沙淤积为主,淤积主要发生在花园口以上河段,粗沙淤积量占总淤积量的比例分别为58.0%、46.9%、48.5%、58.8%,花园口—夹河滩河段内各粒径泥沙淤积分配比例基本均等,夹河滩—高村河段淤积量小,粗沙淤积量相应较小,细沙淤积比例稍大。建议在小浪底水库降水冲刷期尽量避免下泄小流量、高含沙量的水沙过程,若不可避免,则应考虑尽可能减小悬沙粒径。
[Abstract]:Xiaolangdi Reservoir is about to change from the initial stage to the later stage. The sediment discharge from the reservoir will make the river channel of the lower Yellow River silting in varying degrees, which will bring difficulties to maintain the main channel with a certain scale of overcurrent in the lower reaches of the Yellow River. Based on the comparison of four different sediment concentrations and sediment grading schemes, the results show that: (1) non-floodplain high sediment concentration flood with low sediment concentration and fine suspended sediment grain size is relatively small in the lower Yellow River channel, and the sediment accumulation along the course of the lower Yellow River is less than that of the non-floodplain flood with low sediment concentration and fine suspended sediment grain diameter in the lower reaches of the Yellow River. The deposition of each section is more balanced; (2) the sediment concentration of high sediment concentration in non-floodplain is adjusted rapidly along the course, the higher the sediment concentration, the larger the attenuation range, the lower the middle and coarse sediment content is, and the less the fine sediment content decreases along the course; The 34 schemes are dominated by medium-coarse sediment deposition, which mainly occurs above the Huayuankou reach. The proportion of coarse sediment deposition to total sediment deposition is 58.0%, 46.9%, 48.5%, 58.8%, respectively, and the proportion of coarse sediment deposition to total sediment deposition is 58.0%, 46.9%, 48.5%, 58.8%, respectively. In Huayuankou-Jiachan reach, the proportion of sediment deposition in each grain diameter is basically equal, and the amount of sediment in the reach of Jiaotan-Gaocun is small, the amount of coarse sediment is relatively small, and the proportion of fine sediment is a little larger than that in the section of Jiaotan-Gaocun. It is suggested that the process of small discharge and high sediment concentration should be avoided as far as possible during the precipitation scouring period of Xiaolangdi Reservoir. If it is inevitable, the size of suspended sediment should be reduced as much as possible.
【作者单位】：黄河水利科学研究院;济南黄河河务局天桥黄河河务局;
【基金】：国家自然科学基金资助项目(51479080);国家自然科学基金重点项目(51539004) “十二五”国家科技支撑计划项目(2012BAB02B01)
【分类号】：TV147

【相似文献】