Fishway structure for improving fish migration efficiency and construction method thereof

Abstract

The invention relates to a fishway structure for improving fish migration efficiency and a construction method thereof. The fishway structure comprises a body, wherein a dam body connected with river banks on the two sides is built on a river channel, a water inlet is reserved in the dam body, the body extends downstream from the dam body, the inclined upper end of the body directly faces the water inlet and is integrally formed in a pouring mode, the inclined inner bottom surface of the body is slope-shaped and is provided with a plurality of steps which are distributed up and down, the upper end part of the inner bottom surface of the body is concavely provided with a mounting groove which horizontally communicates with an upstream reservoir of the river channel, first guide plates are hinged between the vertical inner walls of the two sides of the mounting groove, the edges of the two sides of the first guide plates abut against the vertical inner walls of the two sides of the mounting groove in a sliding manner, a hinge shaft of each of the first guide plates is close to one side of the corresponding step, and a first floating plate for supporting the corresponding first guide plate is mounted at the lower end part of the edge of one side, facing the upstream reservoir, of each of the first guide plates. According to the fishway structure, fish can still smoothly migrate when the upstream water level is lowered.

Description

technical field [0001] The application relates to the field of water conservancy construction, in particular to a fishway structure and a construction method for improving fish migration efficiency. Background technique [0002] A dam is a water-retaining structure that intercepts the water flow of a river channel to raise the water level or regulate the flow. Dams are built to raise water levels, regulate runoff, and concentrate water heads for flood control, water supply, irrigation, hydroelectric power generation, and improved navigation. From an ecological point of view, the dam spans both sides of the river, and the construction of the dam has become an obstacle to the migration of animals between the upstream and downstream habitats, affecting fish breeding, feeding, and overwintering migration behaviors, resulting in upstream and downstream material, Energy and gene flow are hampered, and fish populations decline. Therefore, people usually build engineering measures...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that there are the following defects: in the process of assisting fish migration in the existing fishway, the water level of the reservoir in the upper reaches of the fishway is relatively high, and the water level in the reservoir needs to be higher than that of the fish. The height of the entrance at the upper end of the channel is affected by the difference in rainfall in different periods and the scheduling requirements of the reservoir. It is difficult to ensure that the water level of the upstream reservoir reaches the height of the upper entrance of the fishway or the water level exceeds the height of the upper entrance. This makes it difficult to form a continuous water flow inside the fishway. Or the water flow is too small, so it is difficult for the fish in the downstream of the fishway to migrate to the upstream flow through the fishway, which reduces the migration efficiency of the fish, so there is room for improvement

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