Abstract: In this paper,a lot of test data of stage varying with width contraction by dike has been obtainedby experiments, including many sets of discharge and and contraction percentage of area,On the basis of analysing changes of stage at the reach of river,relationships between changes of stage at upetream anddownstream reach and contraction percentages of area have been given. By comparsion our cwn calcula-tion with the teet dam-up value at upotream section and the calculation value of others,the result in thispaper is relatively satisfactory,Simple formula for eetimating length of upstream dam-up has been alsomade.

Key words: river spur-dike, water-surface-profile, hydraulic experiment

摘要： 本文通过多级流量和丁坝束窄度等４５组试验的测试，获得许多水位随丁坝束窄度变化的实测资料，在对丁坝河段水位变化的数据统计分析中，获得了丁坝及其临近断面水位变化值与丁坝束窄度关系的经验计算式。并将实测的上游水位壅高值与其它的研究结果和本文找出的公式计算结果进行了比较，得到较为满意的结果，同时给出了估算上游壅水长度的简单公式。为丁坝整治效果的预测提供有力的参考。

关键词: 丁坝, 水面线, 水力试验