Single fishway outlet structure capable for realizing layered fish passing

Abstract

The invention discloses a single fishway outlet structure for realizing layered fish passing. The single fishway outlet structure comprises a single fishway outlet, wherein the rear end of the single fishway outlet is sequentially provided with more than two layers of connecting flow channels from bottom to top along the height direction according to the variable amplitude of the fish passing water level along the water flow direction, the tail ends of the connecting flow channels communicate with a main fishway channel, and the connecting flow channels are composed of lower-layer flow channels and upper-layer flow channels or composed of the lower-layer flow channel, more than one middle-layer flow channel and the upper-layer flow channel. According to the structure, more than two layers of connecting flow channels are sequentially arranged at the single fishway outlet from bottom to top in the height direction along the water flow direction according to the amplitude of the fish passing water level, so that the layered fish passing requirement is met, the number of the outlets of the fishway is reduced, the length of the fishway is shortened, and the investment is effectively saved.

Description

technical field [0001] The invention relates to a fishway outlet structure, in particular to a single fishway outlet structure for layered fish passage. Background technique [0002] For sluice and dam projects, based on environmental protection requirements, in order to ensure that downstream fish can trace back to the upstream reservoir area for spawning and reproduction, fishways are generally used to pass fish. In order to ensure that the fish can go up to the upstream, the flow rate of the fishway water is generally low, usually around 1m / s. Setting up multiple outlets in the upstream to discharge fish will lead to a large number of fishway outlets, large excavation along the bank of the reservoir area, long fishway length, and large investment; Trash racks and gates, each trash rack and gate are generally operated by independent hoisting equipment, which will lead to more gates and trash racks at the fishway exit, more hoisting equipment, and greater investment. The ...

AI Technical Summary

Problems solved by technology

In order to ensure that the fish can go up to the upstream, the flow rate of the fishway water is generally low, usually around 1m / s. Setting up multiple outlets in the upstream to discharge fish will lead to a large number of fishway outlets, large excavation along the bank of the reservoir area, long fishway length, and large investment; Trash racks and gates, each trash rack and gate are generally operated by independent hoisting equipment, which will lead to more gates and trash racks at the fishway exit, more hoisting equipment, and greater investment. The quantity is large, the process is cumbersome, and the maintenance is inconvenient. Therefore, there are still deficiencies in the existing technology and need to be further improved.

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