Composite fish-way system for narrow river valley topography dam

Abstract

The invention discloses a composite fish-way system for a narrow river valley topography dam, belongs to the technical field of design and construction of ancillary buildings for water conservancy andhydropower engineering, and provides the composite fish-way system which is compact in structure, occupies small space and can open a water supply channel at any time according to the change of the upstream water level. The composite fish-way system comprises cutting devices, migration transition channels, a high concrete dam with multiple fish-way outlets formed in an upstream-side dam body as well as multiple water culverts in the number equivalent to that of the fish-way outlets; the fish-way outlets are formed in the high concrete dam at intervals in the vertical direction; the parts, after passing through the high concrete dam, of the water culverts are connected with the various fish-way outlets correspondingly; downstream-side end openings of the water culverts communicate with corresponding parts of the migration transition channels with the axial central lines perpendicular to the water flow direction; the water culverts located in the positions more than 1.5 m deep below theupstream-side water surface are blocked by the cutting devices; and the composite fish-way structure communicates with the downstream-side water body through the migration transition channels.

Description

technical field [0001] The invention relates to a composite fishway system, in particular to a composite fishway system used on a dam with narrow valley terrain, and belongs to the technical field of design and construction of auxiliary buildings of water conservancy and hydropower projects. Background technique [0002] A fishway is a channel for fish to migrate. In popular language, some fishes have the habit of migrating from the lower reaches of the river to the upper reaches of the river to spawn. When the river is cut off due to human reasons such as the construction of a dam, the passage for the fish to migrate upstream will be destroyed. . In order to protect the habits of fish, it is necessary to build an artificial tank across the dam as a passage for fish to migrate, which is called a fishway. The water flow enters the fishway from the upstream and flows out of the fishway from the downstream, but the fish enters the fishway from the downstream and swims out of ...

AI Technical Summary

Problems solved by technology

The main disadvantages of this structure are: 1. The outlets of the fishways are all arranged upstream, and the length along the river is relatively long. The corresponding excavation or concrete works are relatively large, and the investment in the fishway project is relatively large; 2. The number of fishway outlets is relatively large. There are many, and it is necessary to open and close each gate in time according to the upstream water level. When the upstream water level changes greatly and frequently, the operation control of the fishway exit gate is also relatively cumbersome.

The main disadvantages of this structure are: 1. In order to meet the requirements of water level variation, multiple fishway outlets need to be set up along the dam axis in the upstream, which cannot be applied to retaining dams in narrow valleys; 2. Since each fishway outlet needs to be equipped with 1 It is necessary to open and close each gate in time according to the upstream water level. When the upstream water level fluctuates greatly and frequently, the operation control of the fishway exit gate is also relatively cumbersome.

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