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A Fishway Exit and Design Method Adapting to Water Level Changes

A design method and technology of changing water level, applied in climate change adaptation, water conservancy engineering, marine engineering and other directions, can solve the problems of unstable water flow, affecting the efficiency of fish passing, and reducing the stability of water flow in the fish pass.

Inactive Publication Date: 2018-02-09
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For vertical-slotted fishways with multiple elevations, large and rapid changes in the upstream water level of hydraulic structures (especially daily regulation reservoirs) will cause frequent switching of outlet gates, thus reducing the water flow in the fishway. The stability of the state is not conducive to the upward tracing of fish
In addition, the multi-exit vertical slot fishway needs to arrange multiple gates and corresponding automatic control systems, which increases the investment cost of the early stage construction and the later equipment operation and maintenance costs, and increases the difficulty of fishway construction and operation management
[0004] Based on the current research results, in order to adapt to the large fluctuations in the upstream water level of hydraulic structures, the vertical slot fishway needs to be equipped with multiple outlets, but the switching between different outlets makes the operation process of the fishway too complicated, and causes some The instability of the water flow during the operation period affects the fish passing efficiency

Method used

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  • A Fishway Exit and Design Method Adapting to Water Level Changes
  • A Fishway Exit and Design Method Adapting to Water Level Changes
  • A Fishway Exit and Design Method Adapting to Water Level Changes

Examples

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Embodiment 1

[0035] This embodiment is a fishway outlet adapted to changes in water level, such as figure 1 , 2 shown. figure 1 , 2 Shown is an example of this embodiment applied to a vertical slot fish pass. This embodiment includes: an overflow section 2 connected to a fish pass 1 formed by a plurality of conventional pools in series, the overflow section is connected with the outgoing section 3, and the overflow section is composed of a plurality of lengths and widths that are different from those of the conventional water tank. The same overflow pools of the pools are connected and formed, and there are fish passing facilities 4 between the fishway and the overflow section, between the overflow section and the outgoing section, between each conventional pool, and between each overflow pool; The width of the outgoing section is the same as that of the conventional pool, and the height of the side wall of the outgoing section is the sum of the fluctuating water level difference of t...

Embodiment 2

[0061] This embodiment is an improvement of the first embodiment, and is a refinement of the fish passing facility of the second embodiment. The fish passing facility described in this embodiment includes: a guide plate 401 and a partition plate 403, and the guide plate and the partition plate cooperate to form vertical slits 402, such as figure 1 shown.

[0062] The fish pass described in this embodiment uses a vertical slot fish pass, which uses a partition plate and a guide plate to form a vertical slot, so that the water and water can pass through it, and the bottom of each conventional pool is continuously raised upward, so that the fish can easily into the upstream reservoir.

Embodiment 3

[0064] This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment regarding the overflow port. The overflow port described in this embodiment is one of a rectangular notch, a triangular notch, and a circular notch, and a fishing net 501 is provided on the overflow port, such as image 3 shown.

[0065] The length of the rectangular overflow opening can be the same as the length of the overflow pool, which can actually be regarded as an overflow opening formed by a section of the overflow wall being shortened. If it is other forms of overflow, various shapes of overflow can be excavated on the side wall of the overflow pool.

[0066] Because the water level in the overflow pool is determined by the overflow port. It is very easy for fish to jump out of the overflow tank from the overflow port, so a fish net can be set up on the overflow port to place the fish to escape from the overflow tank, causing the fish to ...

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Abstract

The invention relates to a fishway outlet adapting to water level changes and a design method, comprising: an overflow section connected to a travel section, the overflow section is formed by connecting a plurality of overflow pools with the same length and width as conventional pools, There are fish passing facilities between the fishway and the overflow section, between the overflow section and the traveling section, between each conventional pool, and between each overflow pool; the width of the traveling section is the same as that of the conventional pool, and the side wall of the traveling section The height is slightly higher than the highest value of the difference in water level fluctuation in the upper reaches of the reservoir; the bottoms of the overflow pools in the travel section and the overflow section are on the same horizontal line. The present invention adopts the method of setting the overflow section and the traveling section at the outlet of the fishway, so that when the water level of the constantly changing upstream reservoir flows into the fishway, it first drops according to the equal difference of the water level change of each conventional pool of the fishway, so as to ensure that the water flow enters the fishway. The flow after the fishway will not increase, interfere with the swimming of fish, and form an overflow section that ensures that fish can enter the upstream reservoir smoothly even if the water level of the upstream reservoir changes.

Description

technical field [0001] The invention relates to a fishway outlet and a design method adapting to changes in water level, a hydraulic facility and a design method, an environmental protection facility and a design method, and a hydraulic facility and a design method for protecting fish ecology. Background technique [0002] The upstream water level of many hydraulic structures is not a constant value, and often has a certain range of variation, especially the daily adjustment reservoir, which has a larger range of variation. The vertical slot fishway outlet is usually arranged upstream of the hydraulic structure, because it adapts to a relatively small water depth variation during normal operation, so the single outlet of the fishway will be difficult to adapt to the large variation of the water level in the upstream reservoir area. At present, the measures taken to solve the above problems are to arrange a plurality of exits with different elevations upstream of the vertical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/08
CPCY02A40/60
Inventor 孙双科边永欢郑铁刚李广宁柳海涛姜涵张超
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES