SU1693188A1 - Fish protecting construction - Google Patents

Abstract

The invention relates to hydraulic engineering and can be used for the protection and diversion of the rolling fry of fish when the fish-containing stream is collected by the open channel. The purpose of the invention is to increase the efficiency of the facility in operation. Rolling fry of fish concentrates in the surface layers of channel 1 and enters the space under the duct formed by the horizontal cover and side walls 11. Air moves along the duct above the water surface in channel 1, engaging the surface fish-saturated water layer due to friction. The surface layer saturated with young fish is directed to the inlet 5 of the fish drain 4. 1 Cp. f-ly, 2 ill.

Description

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The invention relates to hydraulic engineering and can be used for the protection and diversion of the rolling fry of fish when the fish-containing stream is collected by the open channel.

The aim of the invention is to increase efficiency.

Fig, 1 shows a fish protection structure, a top view; in fig. 2 shows section A-A in FIG. one.

The fish protection structure contains a water intake channel 1, for example, of a straight form, along the coast 2 of which a waterproof wall 3 is installed, separating the fish diverter 4 with its inlet 5, located in the surface layer, from the part of the stream of channel 1 going to the water user. A fan 6 is installed on the bank opposite upstream from the fish outlet 4 of the fish drain 4, which by means of a diffuser 7 is connected to a pressure air duct 8 installed across channel 1 so that its outlet section 9 is located opposite the fish outlet 4 inlet 4 Air duct 8 formed by a horizontal cover 10, rigidly connected with side vertical walls 11, made to the surface of the water. The air duct 8 is made of transparent materials to prevent frightened fry reactions.

The structure for the protection and diversion of early juvenile fish works as follows.

Early juvenile fish at the stages of downstream migrations are concentrated in the surface layers of the stream. Demolished in the surface layers of the intake channel 1 of an arbitrary outline, the rolling young fish fall into the space under the duct 8 formed by the horizontal cover 10 and side walls 11. To eliminate the startling reaction of the young fish, the cover 10 and the walls 11 of the duct are transparent. When the fan 6 is installed, installed on the bank of the channel 1 and connected through the diffuser 7 to the duct 8, an air stream moves across the channel 1 above its free surface, drawing the surface fish layer into motion due to friction. In channel 1, a transverse circulation of the flow occurs, while the fish-rich surface layers are transferred to the bank opposite to the fan 6, along which behind the duct 8 a waterproof seal 3 is made in the flow separating the diverter 4 from the rest of the channel 1, and the inlet fish outlet opening 5 located in place

maximum concentration of fish - in the surface layer.

In order to ensure the effective functioning of the transverse circulation, it is necessary to move the air flow in the duct 8 at considerable speeds, for which it is necessary to reduce the height of the horizontal cover 10 from the free surface of the water, however

excessive reduction of this size increases the resistance to movement of the air flow and increases the power required of the fan 6. The optimal value of this distance is 1020 cm. The width of the air duct 8 is chosen sufficient to ensure the concentration of fish in front of the inlet 5 of the fish reel 4. To maintain constant air flow patterns is necessary

maintain constant cross sections of the duct 8, which, with the level fluctuations in channel 1, can be achieved when the duct 8 is made with the possibility of moving in a vertical plane,

for example, floating and holding pontoons, or lifting devices moved vertically.

A facility for protection and diversion of early juvenile fish allows for the diversion of fish only during the period of their massive skate, which is short in time, does not have any structures in the stream or their elements for separating fish (grids, louvers, etc.), therefore does not create additional resistance to the flow, does not clog, it is ecologically clean, since the young fish encounter with the air flow in nature and this factor is not dangerous for it.

Invention Formula

Claims (2)

1. A fish protection structure, including a fish drain installed in an open inlet channel, formed by a bank and a waterproof wall, and located in front of the entrance to the fish diverter to create a transverse circulation flow from In order to increase the work efficiency, the device for creating the transverse circulation is made in the form of a pressure duct connected by means of a diffuser with a fan on the bank of the channel located opposite to the fish outlet, while the pressure air This house is installed above the water surface across the channel and is formed by a horizontal cover rigidly connected to the side vertical walls made to the surface of the water, and its output section is located in front of the fish drainage pipe. i Ј U /// 6 U /, 2 FIG. 2 2. The construction according to claim 1, distinguishes it by the fact that the pressure duct is made of a transparent material. Ј U ////////// L 6