Arch dam flood-discharge energy-dissipating structure

Abstract

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.

Description

technical field [0001] The invention relates to a flood discharge and energy dissipation structure in a water conservancy and hydropower project, in particular to a flood discharge and energy dissipation structure for a high concrete arch dam in a canyon area. Background technique [0002] At present, in order to meet the requirements of large flow discharge through the dam body in the canyon area, the high concrete arch dam usually adopts the flood discharge energy dissipation structure of the dam body "water tongue collision and pad pond energy dissipation type". The main energy dissipation principle is: Two dams are set up downstream of the dam to form a cushion pond. By rationally arranging the orifices of each layer of the dam body, the discharged water flow is layered and differentially flowed. Increase the dispersion of the incoming water jets and reduce the scouring and damaging ability of the discharged water to the bottom of the river bed; the openings of the dam b...

AI Technical Summary

Problems solved by technology

But at the same time, due to the air collision of the upper and lower hole water strands, a large amount of water mist is generated, resulting in serious flood discharge atomization.

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