A stepped fishway with adjustable partial water blocking height and its design method

Abstract

The invention discloses a ladder-shaped fishway with adjustable local water retaining height and a design method thereof. The ladder-shaped fishway comprises a fishway body arranged in a ladder shape;a plurality of partition plates partitioning the fishway at intervals are distributed on the fishway; a pool chamber is formed between each pair of adjacent partition plates; the partition plates comprise overflow partition plates and hydraulic flap type partition plates which are arranged side by side; and one side face of each hydraulic flap type partition plate is dynamically connected with piston rods of at least two hydraulic cylinders. The ladder-shaped fishway with the adjustable local water retaining height and the design method thereof have the advantages that according to the variation range of stream flow in a fish migration period, parameter setting is carried out on each component part of the fishway, so that the component parts mutually accord with one another; when the fishway is used, the positions of the partition plates can be adjusted according to fish swimming characteristics, so that influence caused by low flow rate and cutoff can be effectively responded, the flow rate adaptive range of the ladder-shaped pool type fishway is expanded, and the problem that a traditional ladder-shaped fishway has poor adaptability to the low flow rate of a riverway can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of fishways, and in particular relates to a ladder-type fishway with adjustable partial water-retaining height and a design method thereof. Background technique [0002] Fish migration is a characteristic acquired during the long-term adaptation process due to its growth and development and the needs of external environmental changes. It is a periodic, directional and clustered migration activity. Fish can realize natural selection and self-regulation through migration, so as to ensure its germplasm quality and genetic diversity. After the construction of permanent barrage structures on natural rivers, the original continuous river ecosystem is divided into fragmented environmental units, and the most direct adverse effect on fish is to block the migration channels. In the last century, fish species and numbers have been declining rapidly, and dams are the main reason why nearly one-fifth of the world's 9,0...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a stepped fishway with adjustable partial water-retaining height and its design method, so as to solve the problem of poor adaptability of the traditional stepped pond-type fishway to the low flow of the river

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