SU1818404A1 - Fishway entrance cap - Google Patents

Description

The invention relates to hydraulic structures for maintaining the natural reproduction of fish, and in particular to fish passages.

The purpose of the invention is to increase the efficiency of attracting fish by increasing the uniformity of flow in the tray of the inlet head of the fish passage under conditions of a changing water level in the downstream.

Figure 1 shows the input tip of the fish passage, a longitudinal section: figure 2 is the same, top view; in Fig.Z - section aa in Fig.1; figure 4 is a section bB in figure 1; figure 5 is a section CC in figure 2.

The inlet head 1 of the fish passage 2 includes a tray 4 with abutments 5 located in the water area 3 of the lower pool; the bottom 6 of the end section of which is located at the bottom mark 7 of the water area 3. The head 1 is divided into compartments 8 by partitions 9 with float

1 818 404 A1

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LS holes 10. The abutments 5 are adjacent to the vertical 3 gobies 11 of the fish passage 2 and have water conduits 12 made in them, which consist of internal 13 and external 14 walls and bottoms connected to the bottom of the water area 3. Water conduits 12 are connected to the located in the goby fish 2 spillway pipes 15 and with a water area 3 downstream, drainage slots 17 are made on the inner walls of water conduits 12, and flat filtering barriers 16 are installed between the inner 13 and outer 14 walls of water conduits 12 from the downstream side 16. Water conduit 12 is connected to the lower water area 3 its pool is made in the form of flooded drain holes 18, formed by installing between the inner 13 and outer 14 walls of the water conduits 12 shields 19, equipped with mechanisms for their vertical movement, made in the form of screw lifts 20.

The spillway slots 17 are adjacent to the vertical gobies 11 of the fish passage 2 and are located above the lower partition 9 of the compartment 8 adjacent to the fish passage 2, and the shields 19 with the elevators 20 are located at the outlet of the water ducts 12 opposite one of the compartments 8.

The mechanisms for the vertical movement of the shields 19 are made in the form of screw hoists 20 containing cargo screws 21, cargo nuts 22 and handles 23 and mounted on the floors 24. If necessary, the hoists 20 can be equipped with gearboxes (not shown), and the drain slots 17 are blocked by water-permeable fish barrels 25 .

The input tip works as follows.

A certain water flow rate is supplied along the path of the fish passage 2 and through the inlet head 1, which is necessary to attract fish to the inlet head 1 and pass them up the fish passage 2. In order to stabilize the conditions for attracting fish with fluctuations in the water level in the downstream area, it is necessary depending on the water depth in water area 3 to feed into the compartments 8 of the tray 4 of the input head 1 various additional water flow.

At low water levels in water area 3, additional water flow for attracting fish from the upper pool through the drain pipes 16 enters the water conduits 12 and through the bottom drain holes 18 all merges into the water 3 of the lower pool, bypassing tray 4 of the inlet head 1. At the same time, the water level in each conduit 12 by a value of Z (Fig. 5), which depends on the magnitude of the additional flow rate and the area of the drain hole 18, is set higher than the water level in the water area 3, but lower than the slot 17. When the water level in the water area 3 increases, the level increases simultaneously water in the water conduit 12, as a result of which the water from the water conduit 12 is drained through the slot 17 into the tray 4 of the inlet head 1. Moreover, the higher the water level in the water area 3, the greater the part of the additional water from the water conduit 12 is drained into the tray 4, in As a result, the difference in the Z levels decreases, and therefore, the water flow through the drain hole 18 decreases. At high water levels, the Z difference decreases to a few centimeters, as a result of which the smoothness of the overflowing water through the slot 17 increases, and the fraction of inefficient stroke through the opening 18 is reduced to a few percent of the total additional expense. Due to this, in the inlet head 1, the hydraulic conditions for attracting and passing fish are preserved.

If necessary, in the process of operation with a screw lift 20, the shield 19 is vertically moved and, thus, the size of the drain hole 18 is changed.

The use of the invention will improve the efficiency of attracting fish by increasing the uniformity of flow in the tray of the inlet head of the fish passage under conditions of a changing water level in the downstream.

Claims (1)

Claim Entrance head of the fish passage, including a tray with abutments located in the waters of the downstream, the bottom of the end portion of which is located at the bottom of the water area, and abutments adjacent to the vertical gobies of the fish passage, water conduits made in the abutments of the tray and consisting of internal and external walls and bottoms associated with the bottom of the water area, and the water conduits are connected to the discharge pipes located in the gobies of the fish passage and the downstream water area, overflow slots are made on the inner walls of the water conduits, and between their internal and external the walls from the downstream side are equipped with flat filtering fish barriers, while the tray is divided into compartments by partitions with inlet openings, characterized in that, in order to increase the efficiency of attracting fish by increasing the uniformity of flow in the tray of the inlet head of the fish passage under conditions of a changing water level in downstream, it is equipped with shields with mechanisms for their vertical movement, while the shields are installed between the inner and outer walls of the water pipes with the formation of flooded drain holes. 3 24