RU2130990C1 - Fishway to pass fish from lower pool of hydraulic works into upper pool - Google Patents

Abstract

FIELD: hydraulic engineering. SUBSTANCE: fishway is designed for continuously attracting the fish into fish conservation works providing controlled fish attracting water flow at fishway swim-in hole and transferring fish from lower pool of hydraulic works into upper pool and back. Fishway is located in dam site depending on type and layout of hydraulic works and is made in form of flume (fish passage duct) with crosswise vertical walls 3 dividing total head of hydraulic works into parts, 3 to 10 m each. Rectangular fishway (swim-in) holes are made in lower part of walls. Water from feed pump is delivered along pipeline to jet forming nozzles located over perimeter of fishway (swim-in) hole at an angle to hole axis. Water jets, thus formed, create partial counterpressure to main flow providing limited velocities of accompanying (fish attracting) flow through fishway (swim-in) hole. This provides continuous attraction of fish and practically nonlimited pool level differential rise reduced length of fishway duct and time taken for fish to pass along fishway. EFFECT: reduced water discharge, provision of safety of fish, no adverse effect on environment. 2 dwg

Description

 The invention relates to constructions of fish passages and is intended for the continuous attraction of fish to a fish passage structure, including the creation of a controlled attracting stream of water at the entrance to the inlet opening of the fish passage and transferring fish from the lower pool of the hydraulic system to the upper and vice versa.

 Known fish passage of a uniform differential equation, containing open above the fish passage channel with chambers formed by dividing walls with inlet openings, while the chambers are located on a single horizontal base. This fish passage channel is also equipped with barrage nets located horizontally in the chambers in the upper part of the fish passage channel at the top of the float holes, and the fish passage channel is located at the bottom of the river. Swim holes are located in the lower bottom of the dividing walls of the chamber, which are made with depth gradually decreasing towards the downstream by a constant value (RF patent N 2057841, class E 02 B 8/08, publ. 10.04.96).

 The disadvantages of the known device is that, firstly, it is suitable for low-pressure waterworks with a differential head up to 3 meters, secondly, it gives a large transit flow of water, which has no practical use, and thirdly, it detains fish in chambers channels, which, in turn, scare away the fish and it does not go into the swimming hole, fourthly, with an increase in the level of the upper pool, the flow velocity in the fish passage increases and the movement of fish along it will be associated with significant expenditures of physical forces, which tionary effect on the ability of fish to move through the fish ladder, fifthly, it gives a high percentage of injuries due to the stress of her fish of barrier nets.

 The technical result from the use of the invention is to ensure the continuous attraction of fish to the fish passage, as well as to practically unlimited increase in the difference in the levels of the downstream, to reduce the length of the fish passage, to reduce the passage time of the fish to the fish passage, reduce the consumption of water resources, ensure fish safety and comply with environmental requirements for nature conservation in the fish passage.

 This is achieved by the fact that in the fish passage for the passage of fish from the downstream end of the hydraulic system to the upper one, containing a spillway tray open at the top with transversely spaced vertical separation walls, the separation walls are made with rectangular fish-shaped openings located in their lower part, along which perimeter jet nozzles are located under angle to the axis of the holes.

 In FIG. 1 shows the placement of the fish passage on the waterworks; in FIG. 2 - device fish passage (sinking) holes.

 The fish passage for passing fish from the lower head of the hydraulic system to the upper one is located in the dam site 1 depending on the type and layout of the hydraulic system and is designed as an overflow drainage channel (fish path) 2 with transverse vertical dividing walls 3 that divide the total pressure of the hydraulic system into parts (3 to 10 meters each). In the lower part of the dividing walls 3 are made fish passage (swimming) holes 4 of a rectangular shape. Along the perimeter of the fish passage holes 4 are jet-forming nozzles 5 at an angle to the axis of the holes. The nozzles 5 are connected by means of a pipeline 6 to the feed pump 7. The water jets thus formed create a partial backpressure to the main stream, which ensures the maximum speed of the satellite (attracting) stream through the fish passage (inlet) opening.

Claims (1)

 Fish passage for passing fish from the downstream end of the hydraulic system to the upper one, containing a spillway tray open at the top with transversely spaced vertical separation walls, characterized in that the separation walls are made with rectangular fish-passage openings located in their lower part, along which perimeter there are jet-forming nozzles at an angle to axis of the holes.

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