Abstract: 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

Key words: hooked-spru ratio, scour-deposition, spur-dike

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．

关键词: 勾长比, 冲淤特性, 勾头丁坝