丁坝群合理间距的试验研究

Experiment at Investigation of Reasonable Spacing among Spur Dikes

通过试验水槽,对群丁坝中主槽的流场进行了测验和分析。根据主槽中流速的沿程变化规律,提出了丁坝最佳间距的寻求原则;得出了群丁坝的间距关系式;阐明了第一、二条丁坝间距最大,第二、三条丁坝间距最小,以后各丁坝间距界于上述两丁坝之间的变化规律。

An experiment of the flow field in the main channel of spur dikes is made in an experimen- tal flume,and the data are analysed.Based on the reqular pattern of change of the velocity distribu- tion alone the flume“the optimum spacing”seeking principle is proposed,the formula for the optimum spacing is obtained,the reqular changing pattern is described and the formula developed:the largest spacing is between the first and the second spur dikes,and the smallest is between the second and the third,the others change between the largest and the smallest.