SU1129280A1 - Fish-protective arrangement for water intake structure - Google Patents

Abstract

Fish protection system intakes, vklychayuv present installed in the supply present water line at an acute angle in respect to it: the spindle mesh, cloth, fish products accumulate fir made in the form placed: vertical front mesh cloth screen-Shelter V-shaped cross section, and a thrust hydraulic for diversion of fish, characterized in that, in order to ensure the effectiveness of the work by reducing the injury of the fish, the screen-shelter is made of sections whose cross-section increases from bottom to top stepped, n When in use, the pressure for the hydraulic system is provided with a fish .otvoda upper section. iput.r 4

Description

The invention relates to hydropower engineering and can be used in the design, construction and operation of hydraulic structures associated with the intake of water from water sources of fishery importance.

A fish intake water protection device is known, including a netting and fish diverter installed in the chamber at an angle less than 90 with respect to the flow, and the disadvantage of such a device is the need to extract significant amounts of water through the fish drainage constituting up to 10% of the total water intake structure.

It is also known a fish protection device for a water intake structure, including a net cloth installed in the supply conduit at an acute angle in its plan to its axis, a fish store made in the form of a V-shaped cover screen placed vertically in front of the net cloth, and a pressure hydraulic system for fish removal 21

However, at considerable depths of water in the supply conduit, in the process of transferring fish from the shelter screen to the fish drainage system, it receives barotrauma due to a sharp transfer from one horizon of water to another.

The purpose of the invention is to increase the efficiency of the work by reducing the injury to the fish.

This goal is achieved by the fact that the vrybopaschitnoi device, including installed in the supply conduit at an acute angle in terms of its axis netting, fish storage, made in the form of a vertical screen in front of the netting screen cover. The Y-shaped cross section and the pressure hydraulic system for fish drainage, the screen cover is made of sections,. the cross section of which is increased stepwise from the bottom up, with the upper section being provided with a pressure hydraulic system for fish outlets.

FIG. 1 shows a fish protection device, top view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2;

280 .2.

in fig. 4 shows a section B-B in FIG. 2; in fig. 5 is a section of YYD in FIG. 2

In the inlet conduit, made in the form of channel 1, a grid cloth 2 is installed at an acute angle in terms of its axis, in particular, it can be installed parallel to the axis of the supply channel 1. Before the grid cloth 2 in the end

in its zone, there is a V-shaped cover screen made of sections 3, 4 and 5, the cross section of which increases stepwise from bottom to top. V-shaped screen cover

is a fish store. The upper section 3 is provided with a mechanical shutter 6 mounted on axis 7 and has two nozzles 8 and 9, respectively, in the upper and lower parts.

Section 3. The lower nozzle 9 is connected to a pressure hydraulic system providing hydrotransport of fish (not shown), and a tray 10, which is a fish diverter, is placed under the upper nozzle 8.

The device works as follows.

Water from channel 1 through mesh screen 2 enters the water intake

structure (not shown). The fish accumulates at the end zone of the mesh sheet 2 and enters the screen shelter. Due to the difference in hydraulic conditions in the lower 4 and 5 and up-.

there are 3 sections x fish moves

in the upper section 3. After accumulation. to the fish, shutter 6 closes the entrance to section 3 of the screen-cover and separates its cavity from the cavity of section 4.

Water is supplied to the pipe 9, and through the pipe 8, the fish enters the tray with water 10. In the lower sections 4 and 5, fish accumulation occurs at this time,

The operation of the fish protection device is based on the following principle. . When the flow structure in a certain volume is characterized by the presence of a gradient, velocities, the fish actively select the flow zones,

corresponding to their ecology and physiological state. At the same time, the behavior of the fish is directed towards the exit from the influence of the current.

Thus, as a result of the organization in the lower sections of the screen to cover the hydraulic modes necessary but not sufficient for the normal natural behavior of the fish and the stepwise development of the screen area so that in the adjacent sections there are zones with quieter water; corresponding zones in the screen Each stage of the screen acts as a check valve. 3to is due to the fact that the fish streaks go away. the near-wall areas furthest from the whirlpools and its transition to the lower sections is limited by the horizontal area of the mating sections of the screen. 0 .4 In addition, on the border of the transition from one JC to another, conditions are created for the occurrence of upward flows as a result of the redistribution of water volumes to the area with a smaller velocity gradient. These circumstances cause the gradual movement of fish up and its accumulation in the upper section. . The use of the proposed device can significantly reduce the injury to fish, i.e. improve the effectiveness of fish protection.

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Claims (1)

FISH-PROTECTING DEVICE FOR WATER-DELIVERY FACILITIES, including those installed in the inlet conduit at an acute angle in plan to it; axis mesh screen, fish collector, 'made in the form of a U-shaped cross section of a shelter screen vertically in front of the mesh cloth, and a pressure hydraulic system for removing fish, characterized in that, in order to increase work efficiency by reducing injury to the fish, the shelter screen is made of sections j, the cross section of which increases with the discharge from the bottom up to a stepwise pressure hydraulic system for. fish is equipped with an upper section. Phi 9.1 1129280 '2