Roundabout type fishway spiral ascending section rest pool

Abstract

The invention relates to a fishway structure, discloses a convolute rising section rest pool of a circuitous fishway, and can eliminate the problems that a main flow in the convolute rising section rest pool is over-concentrated near an outer wall surface, and an adverse flow regime of a relatively large back flow zone exists near an inner wall surface. The convolute rising section rest pool comprises an outer wall, an inner wall, an upstream pool room outlet separating pier positioned at an inlet of the rest pool and a downstream pool room inlet separating pier positioned at an outlet of the rest pool, wherein a pier head guide plate is arranged on the upstream pool room outlet separating pier. According to the convolute rising section rest pool, a baffling pier is vertically arranged at a turning part of the outer wall of the convolute rising section rest pool of the fishway, and the pier head guide plate is deflected towards the outer wall, so that the water flow, entering the turning zone, of an upstream pool room is hindered, the main flow concentrated near the outer wall surface can be diffused, the speed is reduced, the back flow near the inner wall surface is reduced, the flow regime in the convolute rising section rest pool of the fishway is regulated, the flow velocity is reduced, and the fish rest and upstream swimming are facilitated.

Description

technical field [0001] The invention relates to a fishway structure, in particular to a rest pool in the winding up section of a circuitous fishway. Background technique [0002] As an important engineering facility to protect fish resources, fishways have always been favored by water conservancy designers. However, with the emergence of more and more high dams and large reservoirs, the drop of fishways is getting larger and larger. In order to slow down the slope and reduce the The difficulty of going up for small fish is often achieved by setting up circuitous fishways. In addition, limited by topographic and geological conditions, 180° turns are often set in fishway projects to avoid unfavorable layout conditions. The turning of the fishway often leads to the mainstream concentration on one side, and a certain backflow on the other side. When the turning angle is too large, this phenomenon is more obvious, which is not conducive to fish resting and upward tracing. Theref...

AI Technical Summary

Problems solved by technology

The turning of the fishway often leads to the mainstream concentration on one side, and a certain backflow on the other side. When the turning angle is too large, this phenomenon is more obvious, which is not conducive to fish resting and upward tracing. Therefore, it is necessary to set up rectification measures in the turning section to eliminate Energy and rectification are the key points in the design of fishway rest pools, but if the method is not appropriate, it will deteriorate the flow state and fail to achieve the effect of energy dissipation and rectification

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