Hydraulic model investigations of spillway structures for the Chirkey hydroelectric station

Abstract

1. For hydrodevelopments located on mountain rivers with a narrow, tortuous channel deeply incised into the rock, the problem of providing a maximum range of ejection of the flow and simultaneously eliminating its considerable effect on the canyon slopes in the case of a dam spillway with a frontal ski-jump is quite complex. Variants with a spillway tunnel ending with a lateral overflow ski-jump are considerably more flexible. 2. The use of a lateral overflow ski-jump and uniformly distributes the discharges over a sufficiently long stretch of the channel and eliminates the fall of large quantities of water onto the canyon slopes through a wide range of discharges and heads. In this case the intensity of the effect of the discharge on the channel bed can be reduced substantially in comparison with the frontal ski-jump.