护底条件下淹没丁坝坝头局部冲刷试验  

Experimental study on local scouring of submerged spur dike head under bottom protection condition

作　　者：佘俊华[1,2] 夏云峰[3] 徐华[3] 杜德军[3] 郝思禹 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]长江南京以下深水航道建设工程指挥部,江苏南京210017 [3]南京水利科学研究院,江苏南京210029

出　　处：《水科学进展》2016年第4期579-585,共7页Advances in Water Science

基　　金：交通运输部重大科技专项(201132874660);国家自然科学基金资助项目(51309158)~~

摘　　要：淹没丁坝是一种典型的航道工程整治建筑物,工程实施中坝头附近局部冲刷防护问题尤为重要。为研究护底条件下的淹没丁坝坝头局部冲刷特性问题,采用正态模型试验方法,重点研究了护底条件下淹没丁坝坝头局部冲刷坑形态、最大深度与护底宽度的变化响应规律,结果表明,护底条件下坝头局部冲刷坑位于护底边缘附近,当护底宽度小于20 m左右时,最大冲刷深度变化较小,但冲刷坑位置有所远离坝体,最大冲刷深度随着护底宽度的变化规律可用指数关系表达。基于量纲分析原理,建立了粉细沙河床护底条件下淹没丁坝局部冲刷最大深度计算公式。Submerged spur dike is a kind of typical navigation project regulating structure. During the project implementation,the protection of local scouring near the head is especially important. In order to study the characteristics of local scouring of submerged spur dike head under bottom protection condition,this study adopted undistorted model experiment method and focused on studying the variation response rules of the form of the local scour pit of submerged spur dike head under bottom protection condition,its depth and the bottom protection width. The result indicates that the local scour pit of the head under bottom protection condition is near the bottom protection edge. When bottom protection edge is less than 20 m,the variation of the maximum scour depth is relatively small,but the scout pit＇s position is away from the dam body. The variation rule of the maximum scour depth with the bottom protection width can be expressed with exponential relation. Based on principle of dimension analysis,this study established a formula to calculate the maximum local scour depth of submerged spur dike under bottom protection condition on riverbed made of sand.

关 键 词：淹没丁坝 护底条件 最大冲刷深度 

分 类 号：TV863[水利工程—水利水电工程]