丁坝浑水冲刷试验研究

Study of the unclear water local scour depth of spur dike

局部冲刷对河道建筑物的安全影响很大,丁坝作为一种治河建筑物应用广泛但设计理论有待完善。通过水槽试验,研究了单因子变化对浑水条件下的丁坝局部冲刷深度的影响,研究表明:浑水冲刷有别于清水冲刷,丁坝淹没和非淹没的情况下,冲深与相关因子的变化关系有相同也有不同,研究结果可供工程实际参考。

The safety of the erections in the river is affected significantly by local scour. Spur dikes are used widely in river regulation,but the theory about the design of spur dikes needs to be ameliorated. In this paper,the unclear water local scour depth of the spur dike is investigated experimentally in regard to certain single factors,such as the time,the amount of sediment,the upstream velocity,the water depth,and the underwater height of the spur dike. It is shown that the unclear water scour is different from the clear water scour,and the regularity in the changing of the local scour depth of the spur dike with related single factors is not the same when the spur dike is submerged or unsubmerged. The obtained results are beneficial to practical engineering.