Overfallen type stepped plunge pool energy dissipation system

Abstract

The invention provides an overfallen type stepped plunge pool energy dissipation system. The overfallen type stepped plunge pool energy dissipation system comprises plunge pools arranged at different heights of a lateral mountain of a dam body of a reservoir in a multi-step mode, an upstream diversion channel drawing water out of the reservoir, horizontal spillways corresponding to the multiple plunge pools from the second height to the minimum height, and a shoreside diversion channel drawing water in the plunge pool at the minimum height into a downstream river channel. The downstream ends of all the plunge pools are located on the same side, and side walls of the downstream ends are each provided with a downstream weir; a water outlet of the upstream diversion channel is located in the upper portion of the upstream of the plunge pool at the maximum height; the horizontal spillway corresponding to the plunge pool at the second height and the plunge pool at the maximum height are the same in height, the horizontal spillway corresponding to the plunge pool at the second height is connected with the downstream weir arranged on the plunge pool at the maximum height, and a water outlet of the horizontal spillway corresponding to the plunge pool at the second height is located in the upper portion of the upstream of the plunge pool at the second height. The overfallen type stepped plunge pool energy dissipation system can protect the plunge pools against damage, guarantee the safety of the downstream river channel, and increase the energy dissipation rate.

Description

technical field

[0001] The invention belongs to the technical field of flood discharge and energy dissipation in water conservancy and hydropower projects, and in particular relates to an energy dissipation system suitable for combining water cushion ponds and falling flow energy dissipation in narrow valleys and downstream rivers changing from narrow to wide in small flow and high head water conservancy projects . Background technique

[0002] In the construction of high water head power stations, in order to ensure the safety of hydraulic projects in operation, a series of flood discharge and energy dissipation measures are required. Traditional energy dissipation measures include traditional underflow energy dissipation, deflected flow energy dissipation and surface flow energy dissipation. New energy dissipation facilities include vertical shaft swirl energy dissipation, wide end pier, ladder energy dissipation, hole plug orifice energy dissipation, etc. However, for pr...

Examples

Embodiment 1

[0025] The engineering overview of embodiment 1 and comparative example 1 is as follows:

[0026] A power station is built in a narrow river valley, with steep mountains on both banks, and the downstream channel rapidly changes from narrow to wide. The upstream water level elevation of the reservoir is 621.00m and the downstream water level elevation is 531.00m, the drop is 90m, and the discharge flow is 300m 3 / s. Aiming at the above projects, two energy dissipation systems of Example 1 and Comparative Example 1 were used to carry out hydraulic model tests.

[0027] Example 1

[0028] This implementation adopts the energy dissipation system of cascaded water cushion ponds of falling flow, including the water cushion ponds 2 arranged in three steps at different elevations on the side of the reservoir dam body, and the upstream diversion channel 1 that draws the water out of the reservoir. , the horizontal spillway 4 corresponding to the water cushion ponds at all levels of t...

Embodiment 2

[0034] The engineering overview of embodiment 2 and comparative example 2 is as follows:

[0035] A power station is built in a narrow river valley, with steep mountains on both sides, and the downstream channel quickly changes from narrow to wide. The elevation of the reservoir entrance is 2126.00m, the elevation of the exit is 2011.00m, the drop is 115m, and the discharge flow is 600m 3 / s. Aiming at the above projects, two energy dissipation systems of Example 2 and Comparative Example 2 were used to carry out hydraulic model tests.

[0036] Example 2

[0037] This implementation adopts the energy dissipation system of cascaded water cushion ponds of falling flow, including the water cushion ponds 2 arranged in three steps at different elevations on the side of the reservoir dam body, and the upstream diversion channel 1 that draws the water out of the reservoir. , the horizontal spillway 4 corresponding to the water cushion ponds at all levels of the second elevation and...

Embodiment 3

[0043] The engineering overview of embodiment 3 and comparative example 3 is as follows:

[0044] A power station is built in a narrow river valley, with steep mountains on both sides, and the downstream channel quickly changes from narrow to wide. The elevation of the reservoir entrance is 1426.00m, the elevation of the exit is 1321.00m, the drop is 105m, and the discharge flow is 1200m 3 / s. Aiming at the above projects, two energy dissipation systems of Example 3 and Comparative Example 3 were used to carry out hydraulic model tests.

[0045] Example 3

[0046] This implementation adopts the energy dissipation system of cascaded water cushion ponds of falling flow, including the water cushion ponds 2 arranged in three steps at different elevations on the side of the reservoir dam body, and the upstream diversion channel 1 that draws the water out of the reservoir. , the horizontal spillway 4 corresponding to the water cushion ponds at all levels of the second elevation an...

technical field

[0001] The invention belongs to the technical field of flood discharge and energy dissipation in water conservancy and hydropower projects, and in particular relates to an energy dissipation system suitable for combining water cushion ponds and falling flow energy dissipation in narrow valleys and downstream rivers changing from narrow to wide in small flow and high head water conservancy projects . Background technique

[0002] In the construction of high water head power stations, in order to ensure the safety of hydraulic projects in operation, a series of flood discharge and energy dissipation measures are required. Traditional energy dissipation measures include traditional underflow energy dissipation, deflected flow energy dissipation and surface flow energy dissipation. New energy dissipation facilities include vertical shaft swirl energy dissipation, wide end pier, ladder energy dissipation, hole plug orifice energy dissipation, etc. However, for pr...

Examples

Embodiment 1

[0025] The engineering overview of embodiment 1 and comparative example 1 is as follows:

[0026] A power station is built in a narrow river valley, with steep mountains on both banks, and the downstream channel rapidly changes from narrow to wide. The upstream water level elevation of the reservoir is 621.00m and the downstream water level elevation is 531.00m, the drop is 90m, and the discharge flow is 300m 3 / s. Aiming at the above projects, two energy dissipation systems of Example 1 and Comparative Example 1 were used to carry out hydraulic model tests.

[0027] Example 1

[0028] This implementation adopts the energy dissipation system of cascaded water cushion ponds of falling flow, including the water cushion ponds 2 arranged in three steps at different elevations on the side of the reservoir dam body, and the upstream diversion channel 1 that draws the water out of the reservoir. , the horizontal spillway 4 corresponding to the water cushion ponds at all levels of t...

Embodiment 2

[0034] The engineering overview of embodiment 2 and comparative example 2 is as follows:

[0035] A power station is built in a narrow river valley, with steep mountains on both sides, and the downstream channel quickly changes from narrow to wide. The elevation of the reservoir entrance is 2126.00m, the elevation of the exit is 2011.00m, the drop is 115m, and the discharge flow is 600m 3 / s. Aiming at the above projects, two energy dissipation systems of Example 2 and Comparative Example 2 were used to carry out hydraulic model tests.

[0036] Example 2

[0037] This implementation adopts the energy dissipation system of cascaded water cushion ponds of falling flow, including the water cushion ponds 2 arranged in three steps at different elevations on the side of the reservoir dam body, and the upstream diversion channel 1 that draws the water out of the reservoir. , the horizontal spillway 4 corresponding to the water cushion ponds at all levels of the second elevation and...

Embodiment 3

[0043] The engineering overview of embodiment 3 and comparative example 3 is as follows:

[0044] A power station is built in a narrow river valley, with steep mountains on both sides, and the downstream channel quickly changes from narrow to wide. The elevation of the reservoir entrance is 1426.00m, the elevation of the exit is 1321.00m, the drop is 105m, and the discharge flow is 1200m 3 / s. Aiming at the above projects, two energy dissipation systems of Example 3 and Comparative Example 3 were used to carry out hydraulic model tests.

[0045] Example 3

[0046] This implementation adopts the energy dissipation system of cascaded water cushion ponds of falling flow, including the water cushion ponds 2 arranged in three steps at different elevations on the side of the reservoir dam body, and the upstream diversion channel 1 that draws the water out of the reservoir. , the horizontal spillway 4 corresponding to the water cushion ponds at all levels of the second elevation an...

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