The invention discloses a flood-discharging and energy-dissipating structure for the high concrete
arch dam in the gorge area, which can effectively decrease the discharging atomization in the
flood discharge and can meet the requirement of draining the large
water flow through the dam body in the gorge area. The
arch dam flood-discharging and energy-dissipating structure is provided with an upper opening and a lower opening at the dam body, an afterbay dam is arranged at the downstream of the large dam to form a
plunge pool, the upper opening adopts narrow slot falling type to drain, the
water flow from the upper opening and the lower opening does not collide in the air. Through the reasonable arrangement of the position, type and the
discharge angle of the upper opening and the lower opening, the drained
water flow of the whole dam body is fully diffused, the water flow is considerably aerified in the air, the energy per unit area shot into the downstream
plunge pool is decreased, which meets the flood-discharging and energy-dissipating requirement of the dam. At the same time, the water flow from the upper opening and the lower opening does not collide in the air, which considerably decreases the atomization intensity in the
flood discharge. The invention can be widely generalized and used in the
power station that has high
head drop, large flow and is at the deep gorge.