导流墙对弯道横断面水面差影响实验

Experimental analysis on the influence of diversion wall on the surface difference of cross section of bend

为研究导流墙对溢洪道泄槽弯道段水流改善的效果,进行了不同水力条件下溢洪道泄槽弯道设置导流墙水工模型实验。结果表明:设置导流墙后,弯道横断面凹凸岸水面差比无导流墙条件下有明显的下降,但水面差仍然存在;弯道横断面凹凸岸水面差的变化规律与无导流墙时相同,即随流量的增大而增大、随底坡的增大而增大、随弯道轴线半径的增大而减小;导流墙的设置,使弯道横断面凹凸岸最大水面差发生的位置产生变化,有导流墙情况下,大多发生在弯道中间上下游相邻断面,无导流墙情况下,大多发生在弯道中间之前的上游断面。

In order to study the effect of improving water flow in bend of spilling chute using diversion wall,hydraulic model experiments with diversion wall were carried out under different hydraulic conditions in this paper.The results showed that：After setting diversion wall,the surface difference of cross section in concave and convex banks was significantly lower than that in the absence of diversion wall,but the surface difference still existed;Variation of the surface difference was the same as that without diversion,the surface difference increased with the increase of flow rate and bottom slopes,and decreased with the increase of the radius of bend;After setting diversion wall in the bend of spillway chute,the position of the maximum surface difference changed.The maximum surface difference was seen in the vertically adjacent section of middle bend in the presence of diversion wall,whereas in the upstream section before middle bend in the absence of bend.