摘要
通过在水槽中做动床实验,对透水丁坝附近河床的冲刷特性进行研究,并对透水丁坝的冲刷过程进行分析。结果表明,透水丁坝的最大冲刷深度随着透水率的增大而减小,但当透水率的变化范围在20%～30%时,对透水丁坝最大冲刷深度的影响不大;其下游侧有冲刷沟,冲刷深度从坝根(与渠岸接触部分)到坝头逐渐加深;另外,在坝头附近产生冲刷槽,其方向与水流方向一致,冲刷槽的深度随着透水率的增大而减小,当透水率的变化范围在30%～40%时,其冲刷长度为不透水丁坝冲刷长度的一半。
Through mobile bed experiment in sink, the scouring characteristics of river bed near the spur is studied and the scouring process of the spur is analyzed. The result reveals that the maximum eroded depth of permeable spur will decrease with the increase of permeability. But when permeability＇s vary range is between 20%～30%, it exerts a small impaction on the maximum eroded depth of permeable spur; There＇s a scouring ditch at its back side, the depth of which increases gradually from dam bottom （the part touching with the canal bank） to dam top; In addition, it forms a scouring channel near the dam top in the same direction of current flow. The depth of the scouring channel decreases with the increase of permeability. When the vary range of permeability is 30%～40%, its scouring length is a half of that of impervious spur.
出处
《水运工程》
北大核心
2007年第12期94-96,102,共4页
Port & Waterway Engineering
基金
石河子大学"自然科学与技术创新"项目(ZRKX2006-Q14)
关键词
透水丁坝
冲刷
透水率
permeable spur
scour
permeability
