透水斜槛参数对溢洪道弯道水流改善效果的影响

为研究溢洪道泄槽弯道布置不同透水斜槛的水流改善效果,进行室内水工模型试验,对不同透水斜槛方案的弯道水流改善效果进行分析比较。结果表明:弯道布置透水斜槛能够改善水流条件,提高弯道水面均匀度,减小横断面水面差;当透水斜槛较高、条数较多而流量又较小时,将出现弯道凸岸水面高于凹岸的现象;利用回归分析方法,建立了考虑透水槛高、斜槛条数及透水率等参数的弯道水面改善效果预测模型,可供工程设计参考。

Impact of permeable oblique sill parameters on bend flow improvement effect in a spillway

In order to investigate the improvement effect of the arrangement parameters of oblique sillsat the bend flow in the spillway, indoor hydraulic model experiments were carried out. Improvement effect of water flow in the bend of each scheme were analyzed and compared. The results show that the arrangement of oblique sills can improve the bend flow condition, and improve the evenness of water surface meanwhile reduce the water surface difference in cross-sections. Furthermore, in the condition that the number of permeable oblique sills is higher withlarger sillheight and lower discharge, the water level at the convex bank is higher than that at the concave bank where maximum water surface difference appear. The regression analysis method was used to establish the prediction model of the improvement effect of the water surface in the bend considering the parameters of the permeable oblique sill, including the sill height, sill number and permeability rate, which can be used as a reference for engineering design.