Fishway outlet structure adapted to large water level variation amplitude and fish passing method of fishway outlet structure adapted to large water level variation amplitude

Abstract

The invention discloses a fishway outlet structure adapted to large water level variation amplitude. The fishway outlet structure comprises fishway structures and fish outlets, wherein the whole fishway outlet structure is of a cuboid or runway shape; the fishway structures are arranged in an outer side edge wall in a concentrated spiral manner; the fishway structures include a first fishway structure and a second fishway structure; the first fishway structure communicates with the second fishway structure; the first fishway structure presents a certain slope; the second fishway structure is aperpendicular or round corner turning plain slope structure; the fish outlets are arranged on the water sides of the outer side edge wall; the fish outlets communicate with the fishway structures; and a fishway communicates with the bottom end of the side face of the outer side edge wall. The fishway outlet structure has the advantages of improving the capability of the fishway outlets to adapt to water level changes and improving the operation effect of the fishway. The invention further discloses a fish passing method of the fishway outlet structure adapted to the large water level variation amplitude.

Description

technical field [0001] The invention relates to the technical fields of water conservancy engineering and environmental protection engineering, and more specifically relates to a fishway outlet structure adapted to large water level fluctuations. The invention also relates to a method for passing fish in a fishway outlet structure adapted to large water level fluctuations. Background technique [0002] While water conservancy and hydropower projects exert their benefits in flood control, power generation, and shipping, they also have a non-negligible impact on the ecological environment, especially the blocking impact on fish migration channels, which has attracted much attention in recent years. Fishways have been used internationally for more than 300 years as a fish protection measure to alleviate the barrier effect of dams. They can restore fish migration channels and communicate upstream and downstream fish exchanges. [0003] However, for projects with large upstream ...

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Problems solved by technology

[0004] 1) For projects with large upstream water level fluctuations, the length of the fishway between the lowest water level outlet and the highest water level outlet is very long, and its layout occupies a large area. For a dam in a canyon terrain, the outlet section often requires a large Large-scale slope excavation is difficult to arrange;

[0005] 2) The elevation of the side wall in the upstream section of the fishway must be above the highest water level in the upstream to prevent the upstream water from overflowing into the fishway and affecting the operation of the fishway

Therefore, for fishways with large fluctuations in the upstream water level, the height of the side wall at the entrance of the low water level needs to be very high, forming a deep groove, which not only requires a large amount of engineering work for the side wall, but also makes it difficult to observe and maintain the fishway

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