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Tidal river reach fishway inlet design method and fishway inlet

A technology for fishways and river sections, applied in computing, sea area engineering, instruments, etc., can solve problems such as difficult control, water flow obstacles, and fish passing rate less than 50%, achieving the effect of reducing the impact of barriers and improving efficiency

Active Publication Date: 2017-05-31
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing fishways, the smooth passage rate of fish is less than 50%. The main reason is that the fish cannot overcome the water flow obstacles caused by the flow velocity and flow state: on the one hand, the water flow obstacles inside the fishway pond; On the one hand is the water flow obstacle near the entrance of the fishway
Compared with the fishways set up in the middle and upper reaches of rivers that are not affected by tidal currents, in addition to considering the downstream water flow conditions formed by the overall project operation, it is also necessary to consider the factors of upstream and downstream flow direction changes and vertical water level fluctuations caused by tidal currents. so harder to control

Method used

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  • Tidal river reach fishway inlet design method and fishway inlet
  • Tidal river reach fishway inlet design method and fishway inlet
  • Tidal river reach fishway inlet design method and fishway inlet

Examples

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Effect test

Embodiment 1

[0028] This embodiment is a method for designing the entrance of the fishway in a tidal river section and the entrance of the fishway.

[0029] The water flow conditions (flow, water level, flow velocity and flow direction) near the entrance of the fishway set up in the tidal river section are affected by the discharge of the main project, the flow rate of the fishway itself and the tidal flow in the downstream tidal river section. After the water retaining works are built in the tidal river section, during the high tide, the tidal water can go up to the upstream of the gate site, but because the water retaining works prevent the tide water from going up, it will produce the Yongshui effect and raise the tide water level. Therefore, when designing the water level of the fishway inlet, the flow and water level of the upstream and downstream of the fishway inlet need to consider the joint effect of the tidal flow, the main project and the discharge flow of the fishway, and must b...

Embodiment 2

[0048] This embodiment is a fishway entrance in a tidal river section designed according to the embodiment, including the fishway 2 arranged downstream of the water retaining structure 1, and the fishway is located in the tidal river according to the water retaining structure. The relationship between the position of section 3 and the position of the tide rise and fall sets multiple fishway entrances, such as figure 2 , 3 , 4 shown. The far left in the figure is the upstream of the water retaining structure, and the far right is the estuary. The discharge water level 14 of the water retaining structure is the normal water level of the river when there is no tidal interference.

[0049] In this embodiment, according to the calculation of the embodiment, the tide fluctuation conditions in multiple situations are obtained, and the position of the fishway entrance is arranged according to these conditions. The fishway entrance described in this embodiment is not simply the subm...

Embodiment 3

[0055] This embodiment is an improvement of the second embodiment, and is a refinement of the second embodiment regarding the arrangement of the fishway inlet. The fishway described in the present embodiment is as follows: the water retaining structure is arranged in the river section below the neap high tide line 6, and the fishway entrance of the river section is affected by the spring tide, mid tide and neap tide, corresponding to the ebb tide water level of 9, the ebb tide water level of 8, For the ebb tide water level 7 and the normal river water level 14, four fishway entrances are respectively arranged: spring tide ebb water level fishway entrance 12, mid tide ebb water level fishway entrance 11, neap tide ebb water level fishway entrance 10, normal river water level fishway entrance 13 four fishway entrances.

[0056] Such as figure 2 As shown, the fishway entrance of this river section is affected by spring tide, mid tide and neap tide. Corresponding to spring tide e...

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Abstract

The invention relates to a tidal river reach fishway inlet design method and a fishway inlet. The method comprises the steps of: typical tide process selection; tide level calculation; fishway inlet section hydraulic characteristic calculation; fishway inlet arrangement and water level design; and fishway inlet parameter determination. The method builds a flux and reflux model of a tidal river reach by tide current principles and tidal river reach hydraulic characteristics, calculates various types of tidal ranges and the tide level change conditions through the model, calculates and determines optimal fishway inlet positions of various tide levels to adapt to the flows, the flowing directions and the water level changes of different tide currents through the fishway inlet section hydraulic characteristics, improves the fishway fish passing efficiency, reduces the influence on fish stop by the hydraulic engineering construction, and achieves important significance on protection or repair of the river ecological environment.

Description

technical field [0001] The present invention relates to a design method of a fishway inlet in a tidal river section and a fishway inlet, a hydraulic design method and a hydraulic facility, and a technology for fish passing dams such as fishways, protection of fish resources, Methods and facilities for ecological restoration of rivers. Background technique [0002] As an important facility for migratory fish and other aquatic animals to pass through artificial dams, fishways play an important role in coordinating the contradiction between dam construction and the ecological environment. Fishways are set on water retaining structures to meet the needs of migratory fish Requirements for upstream or downstream. However, in the existing fishways, the smooth passage rate of fish is less than 50%. The main reason is that the fish cannot overcome the water flow obstacles caused by the flow velocity and flow state: on the one hand, the water flow obstacles inside the fishway pond; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B8/08G06F17/50
CPCE02B8/08G06F30/13Y02A20/402Y02A40/60
Inventor 白音包力皋穆祥鹏许凤冉刘慧陈兴茹王秀英姜付仁
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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