摘要
本文通过勾头型组合丁坝的概化模型试验，对勾头段长度（Ｄ）变化与坝头冲淤特性的关系进行了分析和探讨，结果表明：（１）随着勾长比Ｄ／Ｌ的增大，勾头丁坝对坝头水流分离区的制涡作用也逐渐增加；（２）Ｄ／Ｌ的变化，对坝头冲刷坑深度和坝后冲淤变形范围有明显的影响；（３）Ｄ／Ｌ＝０．３３－０．５０范围不仅是坝头水流变化和冲淤变化的敏感域，而且是从丁坝特性向顺坝特性转化的临界范围．
A moveable-bed model exporiment is introduced in this paper to study the characteristics of scour-deposition aroundthe booked spur-dike.The results show:(1) the vortex intensity near spur-dike is weakened wity the increase of D/L(ratio of hooked-length to spur-lensth);(2) the range of scour-depeition varies with D/L;(3) D/L=0.33-0.50 isa threshold zone,from which the best behaviour of hooked-spur is changed to that of longitudinal-spur.
出处
《重庆交通大学学报（自然科学版）》
CAS
1994年第3期75-82,共8页
Journal of Chongqing Jiaotong University(Natural Science)
关键词
勾长比
冲淤特性
勾头丁坝
hooked-spru ratio
scour-deposition
spur-dike
