SU753980A1 - Apparatus for protecting fish youth from getting into water intakes - Google Patents

Description

(54) DEVICE FOR PROTECTING YOUNG FISH FROM EQUIPMENT IN WATER CONSTRUCTIONS

one

The invention relates to hydraulic engineering and can be used to protect young fish from getting into water intake structures.

A device is known for protecting young fish from falling into water intake structures, including an open iodine canal, fish net and fish diverter l.

Due to the presence of a fish protection net that prevents the flow of water, the device significantly reduces the performance of the water intake structure.

It is also known a device for protecting juvenile fish from entering water intake structures, including an open feeding channel made in the form of a knee, on the concave side of which a fish receiver 2 is located.

Due to the absence of a fish protection net interfering with the flow of water, the device does not affect the performance of the intake structure, however a significant part of the young fish does not enter the fish receiver and enters the water intake structure, which leads to its death. This is caused by insufficient in intensity circulating currents arising in the flow under the action of sex by centrifugal forces and which are the main separating factor.

The purpose of the invention is to increase the efficiency of fish protection.

This is achieved by the fact that the open channel, made in the form of a knee, has a cross section in the shape of a trapezoid with a variable angle of inclination of the sides to the base from the entrance to the exit on the concave side of the knee from an acute angle to straight and 10 acute.

FIG. 1 shows a general view of the device; in fig. 2 - view A of FIG. one; in fig. 3 - section bb FIG. 2; in fig. 4 - section bb of FIG. I; in fig. 5 is a cross-section of the FIG. one; in fig. 6 is a section DDD FIG. one.

The water intake structure (not shown in the drawing) is connected to the water source 1 by an open inlet channel 2, made in the form of a knee, on the concave side of which a fish receiver 3 is placed, which is connected to the fish accumulator c. 4.

The fish storage chamber 4 has gates 5 and 6 and is connected via a fish diverter channel 7 to a water source 1.

The fish receiver 3 is made in the form of a water overflow shield 8, installed in guides 9 and having a pontoon 10. In front of the shield 8 there is a threshold I.

The device works as follows

Due to the fact that the intensity of transverse circulation is proportional to the depth of the stream when it passes the section of rotation (knee) of the inlet channel 2, but the cross section of which is made in the form of a trapezium with a smoothly varying angle of inclination of the sides to the base, circulating current currents, the intensity maximum of which evenly moves from the side of the knee of the supply channel 2 at the entrance to the knee to the concave side at the exit, which contributes to the concentration of juvenile fish in the trunk of the overflow shield 8 and entering put it into the fish storage chamber 4.

In this case, the normal conditions of diversion of young fish in the event of a change in the water level in the channel 2 are ensured by relocation of the overflow shield 8 in the guides by the 9 pontoon 10, as well as by controlling the water consumption by the shutter 5.

The stopping of the water supply to the fish storage chamber 4 and the fish diversion channel 7, in the absence of a slope of young fish in the river, is carried out by a stopper 6.

No flow

re pi

The use of the proposed device allows to achieve higher efficiency and reliability of removal of young fish from the feed channel of the intake structure.

Claims (2)

1. A. S. Tsipl. Fish net protection installations with drainage. M., “Pischeva Industry, 1973, p. 21. 2. USSR author's certificate No. 626738, cl. And 01 K 61/00, 1977 (prototype). fPue.l / W / 7 //// 7/7/7 ///////// AND FIG. 2 6-6