SU1209759A1 - Fish-protecting arrangement - Google Patents

Description

one

The invention relates to hydraulic engineering and water-related construction, in particular, to structures for the withdrawal of water from reservoirs of fishery importance.

The purpose of the invention is to increase the efficiency of fish protection by maintaining constant conditions for fish diversion.

 1 shows a fish protection device, a plan; on. - view A in FIG. on fig.Z - section bb of figure 2; figure 4 is a view In figure 1; figure 5 - section GG in figure 4.

The fish protection device contains an open channel V with a shield 4 installed at the inlet 2 of the reservoir 3. Behind the entrance 2 there is a channel of the channel 1 consisting of a straight line 5 and a curved 6 sections. Section 6 is coupled to the fish drain 7 by means of a rectangular shield 8, reinforced with a bracket. New 9 on the pontoon 10 with the formation of the hole 11 and moved in vertical guides 12, rigidly connected with the wall of the channel section 6, in which the receiving slot 13 of the diverter 7 is arranged, is curvilinear depending on:

 n

at

 4 (h; b, ha7s 27

where 6 is the angular coordinate of an arbitrary slit cross-section, slotted from the beginning of the curved section of the channel;

H is the height of the location of this section above the bottom of the channel;

B - width of the channel;

C is the Shesi coefficient for the channel bed;

g - free fall acceleration.

The design of the inlet 2 of channel 1 from the reservoir 3 consists of a ramp 14 and moving along it in vertical directions Jup 1x 15 of the shield 4 connected by brackets 16 to the pontoon 17 to form an aperture 18.

The device operates as follows.

Shield 4 provides entry into the area 5 of the channel only over 097592

a layer of water with fry of fish adapted to a depth not exceeding the thickness of this layer. Below inlet 2 when spreading flow

5 throughout the living section of the channel 5 mo. The fish is redistributed into its thickness and the bottom layer. After the water flow rates are equalized, the fish, which manifested a compensatory bar10 reaction, for some time, called the decompression time, moves back to the surface layer. The value of the decompression time for each fish is determined by the hydrostatic pressure value corresponding to the depth of their submergence.

When the water level fluctuates in the reservoir 3, on which the construction is based, the pontoon 17 moves to

vertical direction, changing the position of the shield 4, which is rigidly connected with it by the brackets 16, in the direction of the mjix 15 relative to the ramp 14,

25 providing the same thickness of the water intake layer.

In section 6 of channel 1. (Fig. 1), under the action of unbalanced cent30 robust forces, transverse circulation occurs, which in the surface fish-bearing layer is directed towards the concave bank, where the flue drain slot 13 is located. enters the fish-collecting line 7, from where it is transported using special fish-safe pumps.

Q or by gravity into the reservoir 3 away from the entrance 2.

The movement of a single object at a ramp on a bend is determined by the ratio

45

0 - R V,. T,

(one)

where 0 is the angular coordinate of the curvilinear section 6, counted from the entrance to it as from zero;

R is the radius of curvature of section 6; Vj, is the flow rate of water in it;

T is the time of moving the object across the stream width, equal to B / V, i.e. the ratio of the channel width B to the rate of transverse circulation in the surface layer of water V, j.

3

By substituting into T (1) the value of T expressed in terms of V, we obtain the equation of the trajectory of the fish. on a curved section 6

.- -I-.

Weer U „

(2)

where .9 is the angular coordinate of the point of access of the young to the concave wall of the channel.

From the expression (2) it follows that the larger V | in the channel of a given rivizna and channel width, the closer to the entrance to the turn is the zone of maximum concentration, fish, and the smaller Vg - the farther.

The Vj value for the surface layer is determined as follows:

ten

15

With this in mind, the input of the fish diverter 7 is made in the form of a curved slot 13 (Fig. 2), the outline of which corresponds to the dependence 8 P (n) according to equation (4) within the range of H from the minimum level to the maximum level.

I

V,

4V -LR R

(3, - 2),

(3)

where H is the depth of the stream;

g is the acceleration of free fall; C is the coefficient of the Shesi bed of water conduit.

The joint solution of equations (2) and (3) relatively leads to the expression

9

I

 n

 4T376vt7c

The working area of the slot corresponding to one or another water depth in the channel is determined by the position of the shield

2Q 8, which, due to the fact that it is rigidly connected to the pontoon 10, changes in full accordance with the fluctuations in the level of the free surface of the flow. In this part of the slot 13

25 is located in front of the water intake zone along the stream, it is Bbmie of the edge, and the part located behind this zone does not work for overflow, since it is closed (4) 30-th 3209759

The width of channel B and the coefficient of Chezi C practically do not change during the pro- duction of the structure, and the depth H of the water in it varies with the level of the free surface of the reservoir 3.

With this in mind, the input of the fish diverter 7 is made in the form of a curved slot 13 (Fig. 2), the outline of which corresponds to the dependence 8 P (n) according to equation (4) within the range of H from the minimum level to the maximum level.

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TT / 7 // / X / /// // / ///

1209759

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Fig.Z

17

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VNYIPI Order 477/36 Circulation 642 Subscription

Branch PPP Patent,

Uzhgorod, Projecto st., 4

Claims (2)

1. FISH PROTECTION DEVICE, including an open channel with an adjustable shield installed at the entrance from the reservoir in vertical guides, behind which there are straight and curved sections of the channel bed, on the concave bank of the latter there is a fish outlet entrance made in the form of a slit, characterized in that, with In order to increase the effectiveness of fish protection by maintaining constant conditions for fish diversion, the entrance of the fish drain is provided with a rectangular shield, a pontoon and vertical guides, in the grooves of which For movement, a rectangular shield is mounted attached with its upper edge to the pontoon with the formation of a hole between them, and the slotted slot is made curved according to 1 ^In θ ^_ V -47370 ^^ - ^ 27-7 where θ is the angular coordinate of an arbitrary section of the slotted slot · from the beginning of the curved section of the channel; © H is the height of this section above the bottom of the channel; B - channel width; C is the Shezy coefficient for the channel - acceleration of gravity . 2. The device according to claim 1, characterized in that the shield at the entrance to the channel is equipped with a pontoon, to which it is attached with its upper edge to form an opening between them. SU _m , 1209759>