淹没丁坝附近的水流流态

Flow Pattern near the Submerged Spur Dike

以水槽试验为基础，对淹没丁坝附近的水流现象进行了定性描述。采用量纲分析的方法，结合试验资料提出了过坝流量的计算公式、坝前最大壅水值的计算公式；并由动量方程导出了丁坝下游主槽平均流速沿程变化公式；并以此为基础，讨论了丁坝恢复段长度。

he flow pattern near the submerged spur dike are discussion. Based on the experi-mental data,the empirical formulas used to determine the discharge over the spur dike and the mean velocity of main channel varing with distance downstream and back water caused by spur dike are proposed,and the principle decided the interval between the dike and the section where the flow restorated are also presented.