摘要
小浪底调水调沙过程中,黄河中下游发生的洪峰异常增值现象是由河道糙率减小所致.通过挟极细沙水流的明渠水槽实验,证明极细沙在粗糙床面具有明显的减阻作用,并对减阻机理进行了分析.该研究对于含沙水流的运动规律以及洪水的预报与防洪具有重要的参考价值.
In view of the abnormal phenomenon that a flood peak increased in August 2004 and July 2005 along the lower Yellow River, the mechanism of this abnormal phenomenon is studied. It is found that the flood increase was due to the decrease the channel roughness in the propagation of high concentrated flood carrying the extra fine sediment which was discharged from the Xiaolangdi Reservoir. Then the experiment with extra fine sediment flowing smooth, roughness beds is studied. Based on the comparison between the distri- butions of velocity and the analysis of resistance in the experiment, the results show that resistance of flow may be considerably reduced by the extra fine sediment if the flow boundary is rough. The research result has significant value for flood control and flood prediction.
出处
《三峡大学学报（自然科学版）》
CAS
2008年第5期1-3,共3页
Journal of China Three Gorges University：Natural Sciences
基金
国家“十一五”科技支撑计划项目(2006BAB06B05)
国家自然科学基金委员会与水利部黄河水利委员会黄河联合基金资助项目(50339020)
关键词
糙率
减阻
挟沙水流
实验
roughness
drag reduction
flow with suspended sediment
experiment
作者简介
通讯作者：朱长军（1976-），男，讲师，博士研究生，主要研究方向为水力学河流动力学，水资源环境．
