渥奇面上设掺气挑坎,流速大时可能发生散水现象,强烈散水会对泄洪建筑物产生不利影响,应尽可能避免。经试验研究发现散水现象的强弱与掺气挑坎布设于渥奇面上的位置有关,布于下游明显弱于上游。主要原因是加设挑坎后,边界变化的剧烈程度不同,上游边界变化更为剧烈。实际布置中,在合理保护范围内,在不发生散水等不良水力现象的基础上,应将掺气挑坎尽量往上游布置,目的是增大保护范围,提高安全性能。 There is aeration pick-up on the Wauchi surface. When the flow rate is large, the phenomenon of loose water may occur. Strong water dispersion will adversely affect the flood-releasing structures and should be avoided as much as possible. The experimental study found that the strength of scattered water is related to the location of the aerated tug on the Wauchi surface, which is obviously weaker than the upstream in the downstream. The main reason is that after the construction of the Tiaokan, the intensity of the boundary changes is different, and the changes of the upper boundary are more violent. In the actual layout, within the reasonable protection range, on the basis of not producing adverse water phenomena such as loose water, the aeration picks should be arranged upstream as far as possible so as to increase the protection scope and improve the safety performance.