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本文通过在试验水槽中模拟河道工程常采用的勾头丁坝这种组合坝型，着重研究了不同勾角和不同勾长组合时时而场产生的影响，分析了产生这种影响的内在机理．结果表明：（１）增加勾头后，不同程度地减弱了原了坝坝头水而分离产生的漩涡，减少了坝后能量损失．（２）同一匀长内不同勾角对坝头前后的流速分布将产生不同的影响．本研究成果对指导航道整治工程、护岸及滨江工程有一定的参考价值．
In this paper, the combination of dams and gibbbles, which are often used in simulating river courses in test flume, is studied in this paper. The effects of different time-and-frequency fields on different hook angles and combinations of hook lengths are studied emphatically. The inherent mechanism of this effect is analyzed. The results show that: (1) After increasing the hook, the vortex separated by the original dam water is weakened to some extent, reducing the energy loss behind the dam. (2) Different angles of the same uniform length will have different effects on the flow velocity distribution around the dam head. The results of this study have certain reference value for guideway regulation works, bank protection and riverside project.