潜坝壅水规律研究  

On backwater regulation of submerged dikes

作　　者：于广年[1] 王义安[1] 章日红[1] 

机构地区：[1]交通运输部天津水运工程科学研究所工程泥沙交通行业重点实验室,天津300456

出　　处：《水运工程》2011年第8期80-82,87,共4页Port & Waterway Engineering

摘　　要：潜坝的壅水效果是水流经潜坝作用后一部分动能向势能转化的结果,不同条件(糙率、底坡、纵断面形状等)下潜坝水位壅高值与潜坝阻挡面积比率关系密切。采用理论分析与水槽试验相结合的方法,首先分析了潜坝的壅水机理,并在水槽中进行了不同底坡、流量、坝高、坝体结构对水位壅高及流态的试验,建立了水位壅高值、局部阻力系数与阻挡面积之间的经验关系式,引进了应用于天然河道的有效阻挡面积修正系数β,并对公式计算结果与天然实测值进行比较,验证了经验关系式的合理性。Due to the function of submerged dikes,part of water＇s kinetic energy inverts to potential energy,which leads to backwater.The backwater height is hand in glove with the ratio of block-off area under different conditions,such as coefficient of roughness,bottom slope,profile shape and others.Combining the theoretical analysis with the flume experiment,we analyzed the backwater mechanism of submerged dike,and did the experiments on the affect of different bottom slopes,discharges,dams with various heights and dam structures on water level increasing and flow pattern,with the empirical relationship among water level increased,coefficient of local resistance,maximal flow velocity on top of dam and block off area established,and the correction factor β of effective block off area for the natural river introduced.Based on the comparison between the calculated results and natural measured data,we verified the reasonableness of the empirical relation.

关 键 词：潜坝 阻挡面积 壅水规律 局部阻力系数 

分 类 号：TV855[水利工程—水利水电工程]