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 water flow from the downflow produces a hydraulic jump in the stilling pool, the main flow impacts the water body in the stilling pool, and the surface rolls, and the strong mixing and shearing of the water flow in the pool 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 th...

Examples

Embodiment 1

[0032] In this example, the maximum water release in the reservoir area is 10578m 3 / s, the dam crest and the dam flow at the same time, the maximum dam height of the gravity dam is 103m, the drop from the highest water level of the gravity dam to the dead water level is 67m, the anti-scouring capacity of the downstream river bed is weak, and the channel width for the construction of the stilling pool is about 40m.

[0033] The structure of the high dam flood discharge bottom flow energy dissipation device classified into the pool described in this embodiment is as follows: Figure 5 , Figure 6 shown. In the stilling pool 3, four steps are sequentially arranged from upstream to downstream, and the length of the first step is l 1 is 11.0m, the length of the second step is l 2 and the length l of the third step 3 Both are 9.5m, and the length of the fourth step is l 4 is 12.0m, the height of the vertical surface at the beginning of the first step is 6m (that is, the height o...

Embodiment 2

[0038] In this example, the maximum discharge of the reservoir area is 7200m 3 / s, only the flow in the dam, the maximum dam height of the gravity dam is 73m, the drop from the highest water level of the gravity dam to the dead water level is 50m, the anti-scour capacity of the downstream river bed is weak, and the channel width for the construction of the stilling pool is about 38m.

[0039] The structure of the high dam flood discharge bottom flow energy dissipation device classified into the pool described in this embodiment is as follows: Figure 9 , Figure 10 shown. In the stilling pool 3, three steps are sequentially arranged from upstream to downstream, and the length of the first step is l 1 is 8.0m, the height of the vertical surface is 14.8m, and the length of the second step is l 2 is 9.0m, the height of the vertical surface is 14.6m, and the length of the third step is l 3 The height of the vertical surface is 14.4m, the length L of the stilling pool is 57m, a...

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 water flow from the downflow produces a hydraulic jump in the stilling pool, the main flow impacts the water body in the stilling pool, and the surface rolls, and the strong mixing and shearing of the water flow in the pool 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 th...

Examples

Embodiment 1

[0032] In this example, the maximum water release in the reservoir area is 10578m 3 / s, the dam crest and the dam flow at the same time, the maximum dam height of the gravity dam is 103m, the drop from the highest water level of the gravity dam to the dead water level is 67m, the anti-scouring capacity of the downstream river bed is weak, and the channel width for the construction of the stilling pool is about 40m.

[0033] The structure of the high dam flood discharge bottom flow energy dissipation device classified into the pool described in this embodiment is as follows: Figure 5 , Figure 6 shown. In the stilling pool 3, four steps are sequentially arranged from upstream to downstream, and the length of the first step is l 1 is 11.0m, the length of the second step is l 2 and the length l of the third step 3 Both are 9.5m, and the length of the fourth step is l 4 is 12.0m, the height of the vertical surface at the beginning of the first step is 6m (that is, the height o...

Embodiment 2

[0038] In this example, the maximum discharge of the reservoir area is 7200m 3 / s, only the flow in the dam, the maximum dam height of the gravity dam is 73m, the drop from the highest water level of the gravity dam to the dead water level is 50m, the anti-scour capacity of the downstream river bed is weak, and the channel width for the construction of the stilling pool is about 38m.

[0039] The structure of the high dam flood discharge bottom flow energy dissipation device classified into the pool described in this embodiment is as follows: Figure 9 , Figure 10 shown. In the stilling pool 3, three steps are sequentially arranged from upstream to downstream, and the length of the first step is l 1 is 8.0m, the height of the vertical surface is 14.8m, and the length of the second step is l 2 is 9.0m, the height of the vertical surface is 14.6m, and the length of the third step is l 3 The height of the vertical surface is 14.4m, the length L of the stilling pool is 57m, a...

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