Water guide board arranged on outlet of pressure drainage channel

Abstract

The invention discloses a water guide board arranged on an outlet of a pressure drainage channel. The water guide board is arranged on an extension section of a baseboard and a top board or the extension section of a side wall at the back of an arc-shaped working gate at the water outlet of the pressure drainage channel; the extension section on the baseboard and the top board is a sudden-expanding extension section or a non-sudden-expanding extension section; the water guide board starts from the middle of the extension section and gradually lowers the height of a water flow passage in a water outlet direction; the extension section of the side wall is the sudden-expanding extension section; and the water guide board starts from the middle of the sudden-expanding extension section and gradually narrows the water flow passage in the water outlet direction. Since the water guide boards of the invention have various forms, not only the nappe shape shot through the pressure drainage channel can be changed, but also the water flow can be guided to proper places for flowing in so as to be separated from water entry points of other flood-discharge facilities to achieve disperse and divisional water entry, thus achieving the purpose of energy dissipation for disperse and divisional water entry while avoiding outgoing water flow directly shocking two shores, and then effectively weakening washing of water flow on a downstream channel.

Description

technical field [0001] The invention belongs to the technical field of water guiding facilities at the outlet of a waterway with pressure release, and in particular relates to a water guide plate arranged at the outlet of a waterway with pressure release. Background technique [0002] When the high dam body discharges flood, according to its main purpose, such as lowering the water level of the reservoir, discharging sand, or emptying the reservoir, drainage structures such as medium holes, deep holes or bottom holes are often built on different parts of the high dam body. When these discharge structures are in operation, because the water level in the reservoir area is generally much higher than the top elevation, they are often designed to pass through the dam body as a pressurized form, and an arc-shaped working gate is set on the downstream outlet side of the dam body. When the sluice gate is opened, the water flows directly into the air and falls naturally, entering the...

AI Technical Summary

Problems solved by technology

Although the layout of deflected flow energy dissipation has the advantages of simple layout and less engineering quantity of drainage structures, it can greatly save engineering investment and shorten the engineering period, especially when the reservoir is built in a relatively open river section, such as the Three Gorges Hydropower Station. When the discharge front (the dam section for arranging discharge structures) is wide, this arrangement can generally fully meet the design requirements, but if the flood discharge flow of a single hole is large, the water flow will also cause concentrated erosion of the river, especially When the reservoir is built in a relatively narrow section of the canyon, the water tongue will spread naturally after being projected out of the discharge structure, which may impact the two sides of the bank. cause severe erosion

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