Classified pool-inlet high-dam flood discharge energy dissipater for bottom flow and energy dissipating method

Abstract

The invention discloses a classified pool-inlet high-dam flood discharge energy dissipater for bottom flow. The classified pool-inlet high-dam flood discharge energy dissipater comprises a gravity dam and an absorption basin. At least two different elevation positions in a body of the gravity dam are provided with flow discharging channels extending downstream respectively, and falling banks are arranged below outlets of the flow discharging channels, wherein the falling banks are internally provided with ventilation galleries and ventilation holes. At least three levels of steps are sequentially arranged in the absorption basin from the upstream part to the downstream part. When flow passes through the top and the interior of the dam at the same time, the outlets of the flow discharging channels are sequentially located on vertical faces of the steps, with the corresponding level numbers from the upstream part to the downstream part, in the absorption basin from high to low according to the elevation of the outlets. When the flow only passes through the interior of the dam, the outlets of all the flow discharging channels are sequentially located on the vertical face at the starting position of the first-level step in the absorption basin and the vertical faces of the steps with the corresponding level numbers from the upstream part to the downstream part in the absorption basin from high to low according to the elevations of the outlets. With the energy dissipater, water in a reservoir enters the absorption basin from the flow discharging channels at the different elevations or from the top of the gravity dam and the flow discharging channels of the different elevations, and the water is scattered on the faces of the steps with the corresponding level numbers from the upstream part to the downstream part respectively in the absorption basin for energy dissipation.

Description

technical field [0001] The invention belongs to the technical field of flood discharge of water conservancy and hydropower projects, and in particular relates to a high dam flood discharge bottom flow energy dissipation device and energy dissipation method. Background technique [0002] The early high dam flood discharge bottom flow energy dissipation works consisted of gravity dams and stilling basins (see figure 1 ), using the way of the dam crest overflow and downstream connection to the stilling pool to realize energy dissipation, the discharged water will generate a hydraulic jump in the stilling pool, the mainstream impacts the water body in the stilling pool, the surface will roll, and the water flow in the pool will generate strong mixing and shearing. Cutting and aeration, so that the kinetic energy of the discharged water flow is converted into heat energy to reduce the flow velocity of the water flow, and the flow state changes from rapid flow to slow flow. After ...

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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies in the prior art, to provide high dam flood discharge bottom flow energy dissipation devices and energy dissipation methods that are graded into the pool, to solve the problems of high water head and large flow bottom flow energy dissipation, and to improve high dam flood discharge bottom flow energy dissipation. Work life and energy dissipation rate

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