FIELD: construction.
SUBSTANCE: invention relates to hydraulic engineering, namely, to methods to attract and transfer fish producers via retaining structures to areas of spawning and ongrowing. In the proposed method a fish pass is arranged in the form of a channel 1 of rectangular cross section with a bottom inclination having incomplete transverse partitions 2 or in the form of a tray 3 with a stepped bottom and transverse partitions 4 with swim-in holes 5, forming a row of chambers or pools 6 and falls between them. In some internal transverse partitions 7 of the fish pass the swim-in holes 8 are framed with a flow-generating apron 9. A system of jet-forming nozzles 11 is installed under coverage of the apron 9 in galleries 10. Besides, nozzles 11 are aligned towards an upper reach and are arranged at the angle or in parallel to an axis of a swim-in hole 8. The system of jet-forming nozzles 11 is supplied from distributing headers 12. Water required to generate hydraulic jets 13 is supplied to distribution headers 12 along bypass discharge pipelines. Further a transit water flow 17 is sent from the upper reach to orient fish among chambers or pools 6 of the fish pass. At some inner transverse partitions 7 of the fish pass a system of jet-forming nozzles 11 is connected for swim-in holes 8. At the moment of water outflow via the system of jet-forming nozzles 11 the hydraulic jets 13 are formed. For more efficient full rest of fish moving along the fish pass in the fish pass pool 16, appropriate hydraulic conditions are developed using hydraulic resistance to a transit flow 17, i.e. zones of partially equal pressures 15. Whirlpool zones 18 in tray structures are created for partial rest of fish prior to a rush to overcome a transit flow 17 or swim-in holes 5. Hydraulic conditions supporting full efficient rest of fish moving along a fish pass are developed via sections of a fish pass route having equal length or via sections of a fish pass of different length, besides, in this case the section lengths regularly decrease towards the upper reach.
EFFECT: invention will make it possible to use classic fish passing technologies at medium and high head water developments, eliminating negative impact of water level variation in reaches of a water development and providing for simultaneous free and independent passing of fish into an upper reach of a water development.
3 cl, 3 dwg
