摘要
运用Vectrino流速仪,对丁坝坝头附近三维流速进行了测量,详尽分析了坝头冲坑的形成机理。通过采用定床模型与动床模型相比较的方法,分析坝头附近三维流场的不同,得到了坝头冲坑形成的过程和冲刷的原理。结果表明,形成坝头局部冲坑的根本原因是由于底部流速的增加和主流断面收缩而导致流量集中所造成,不断产生的漩涡向下游扩散并卷起坝头附近槽底泥沙随水流而被挟带到坝后,加速了冲坑的形成。
By using the Vectrino current meter to measure the tree-dimensional velocity of scour hole around spur dikes, the mechanism of the form of scour holes around spur dikes is analyzed. By comparing the immovable and movable model , a process of forming sour holes and principles of scouring are gained. The results indicate that the increase in bottom velocity and the focusing of flux caused by shrinkage of mainstream produced it, the eddy which is diffused to the downriver holds the bed load to the back of the dike, thus accelerating the formationof sour holes.
出处
《中国农村水利水电》
北大核心
2009年第11期118-121,共4页
China Rural Water and Hydropower
关键词
丁坝
坝头冲坑
三维流场
漩涡
spur dike
scour hole
three-dimensional flow field
eddy
