SU1717713A1 - Arrangement for passing young fish from upper to lower pond of hydraulic engineering complex - Google Patents

Abstract

The invention relates to a fishery of aquatic hydraulics and can be used to transfer fry of fish from the headwater of a river power unit to the downstream. The purpose of the invention is to reduce the trauma of fish by softer mating of the fish flow from the downstream. The device contains a two-section shutter 1 installed above the weir 2 and a beam 5 to which the entrance part of the tray 4 is attached, which is made in the form of a frame of sections arranged one behind the other and covered with a flexible shell. The tail part of the tray 4 is provided with rigid tray-shaped sections 7 arranged in the downstream 6, rigidly connected to each other. Each subsequent section is made with large height and width with the formation of culverts between the front part of the previous section 7 and the rear part of the next section 7. Young fish with water from the upper pool 9 through the upper section of the valve 1 enters the tray 4 and then in section 7 and through the hole 10 goes to the downstream 6. From the downstream 6, water is sucked through the openings between sections 7, increasing the water flow in sections 7, reducing the energy of the stream, reducing average flow rates and preventing the fish from contacting hard 7. The surfaces of the sections 2 yl. h y

Description

The invention relates to hydraulic engineering, specifically to fish passage facilities, providing the transfer of juvenile fish from the upper to the downstream, and is intended for use on hydroelectric facilities built on fishery rivers.

The purpose of the invention is to reduce injury to fish by softer pairing of the fish-carrying flow with the downstream.

In Fig.1 shows a device, a vertical longitudinal section: in Fig.2 a section A - A in Fig. 1.

A device for passing juvenile fish from the upper to the downstream waterworks includes a two-section shutter 1 mounted on the crest of the spillway 2, a water well 3 and a fish passage flexible tray 4, made in the form of a frame from sections arranged one after another with floats covered in a flexible shell. The input part of the tray 4 is installed above the crest of the spillway 2 and attached to the beam 5, and the tail part is equipped with rigid tray-shaped sections 7 located in the downstream pool 6, rigidly interconnected. Each subsequent section 7 is made with a greater width and height than the previous section, with the formation of the bottom and side culverts 8 between the front of the previous section 7 and the rear of the subsequent section 7. Position 9 indicates the upper pool of the spillway 2, and position 10 - the outlet devices. Section 7 to ensure the required buoyancy is made with cavities 11.

Located in the surface water layers of the upper pool 9, the young fish is carried away by the flow of water, passes over the upper section of the shutter 1 installed above the crest of the spillway 2, and falls on a flexible fish passage tray 4 connected in the lower part to the rigid sections 7 of a prismatic cross section, increasing along as you approach the lower pool 6. Between the side walls and the bottoms of adjacent sections 7 by increasing their height and width (constant within one section, but increasing from section to section towards the outlet Verstov device 10) formed sluice opening 8, through which the water from the downstream sections 6, 7 falls inside, mixed with the flow rybonesuschim, braking it. Due to the certain buoyancy of sections 7, the mark of the free surface of the fish-bearing stream inside the sections 7 is below the water level mark of the lower pool 6. Due to the formed level difference, water from the lower pool 6 through the culverts 8 will overflow into the sections 7, and it will flow will be on the periphery of the fish-carrying stream, i.e. along hard surfaces - side walls and bottoms, preventing mechanical contact of fish with hard surfaces. The suction of additional water flow from the downstream 6 causes a sequential decrease in each underlying section 7 of the average longitudinal flow rate, since mixing is accompanied by an increase in flow rate, leading to a decrease in flow rate. Reducing the speed of the fish-carrying flow by selecting the number of sections 7 and additional costs through each culvert hole 8 can be performed stepwise to a value safe for fish, irregularly, also safe for them, for example, 10 m / s for downstream juveniles of most fish.

The length of sections 7 is assigned sufficient to transfer the downstream fish juveniles for the flow energy absorbers, which are dangerous for it, — the water well 3, in which the main discharge stream is highly aerated and has large pulsations of velocities and pressures, which leads to clogging of fish gills with air bubbles , shock condition, the possibility of mechanical and pressure injuries. The location of the outlet 10 behind the water well 3 eliminates the possibility of juvenile similar injuries.

Claims (1)

Formula The device for passing juvenile fish from the upper to the lower tail of the hydroelectric complex, including a spillway located in the spillway with a two-section shutter on the ridge and an energy absorber at the underlift tray, made in in the form of a frame from sections one after the other with floats, covered with a flexible shell, the inlet of which is installed above the crest of the spillway, characterized in that, in order to reduce injury to the fish by softer pairing of the fish-carrying stream with the downstream tail ca The tray in contact with the downstream end is provided with rigid tray-shaped sections rigidly connected to each other, each subsequent section being made with a greater width and height than the previous section, and with the formation of bottom and side culverts between the front of the previous section and the rear of the subsequent sections.