摘要
水流经一定的入射角进入河道后,引起横、纵向的泥沙运动,导致床面形态发生剧烈变化,这对河道初始阶段的弯曲演变具有显著影响。通过自然模型实验的方法,借助模型小河来探讨这一过程。实验表明,入射角对河道初始阶段的弯曲演变具有显著作用,入射角改变了起始阶段的弯曲度和输沙规律,加速了河弯的出现,且随着入射角的增大,河道的弯曲度呈增大趋势;此外,坡降对河弯的演变也具有一定作用,坡降的持续增大,抑制了曲流的形成,减缓了河流的弯曲演变。
Water flowing through a certain inflow angle into river channel would cause the longitudinal and transverse sediment movement,which would have remarkable influence on the initial stages of river bend evolution.The natural model test method is selected here to research this process.The results show that the inflow angle plays a significant role in the initial stages of river bend evolution,it changes the bending degree and sand transport law in the initial stages,and speeds up the river bend to appear.Along with the increase of the inflow angle,the degree of river bend tends to increase.In addition,the river slope has a certain effect on the evolution of the river bend.As the river slope is increasing,the formation of meandering would be inhibited,which would slow down the evolution of the river bend.
出处
《水利与建筑工程学报》
2011年第5期45-48,86,共5页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金资助项目(50979066)
关键词
河流演变
入射角
河湾
模型实验
river channel evolution
inflow angle
river bend
model test
