Method and system for adjusting river flow field at fishway entrance

A flow field adjustment and adjustment method technology, which is applied in sea area engineering, construction, climate change adaptation, etc., can solve problems such as turbulent flow, hindering fish gathering, complex and changeable flow field structure in downstream rivers, etc. The effect of simple structure

Inactive Publication Date: 2019-01-18
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by water flow conditions and terrain conditions, the downstream channel flow field structure of the actual gate and dam project is very complex and changeable, which poses a huge challenge to the location selection and design of the fishway inlet
[0003] The entrance of the fishway is located downstream of the dam, and the flow velocity is usually relatively high. When selecting a location for the entrance of the fishway, although it is possible to choose a location with stable water flow, in most cases, any disturbance on the river bank will cause turbulent flow, hinder the accumulation of fish, and Affects fish finding fishway entrances, often disastrous for fish

Method used

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  • Method and system for adjusting river flow field at fishway entrance
  • Method and system for adjusting river flow field at fishway entrance
  • Method and system for adjusting river flow field at fishway entrance

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Experimental program
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Embodiment 1

[0022] The present embodiment is a method for adjusting the flow field of the river channel at the entrance of the fishway, which is: a flow field adjustment facility is arranged upstream of the entrance of the fishway along the river bank, and the flow field adjustment facility enables the entrance of the fishway to form an inner flow field and an outer flow field. The flow field is divided into two flow fields. By adjusting the shape of the flow field and the parameter adjustment of the flow area of ​​the water inlet, the magnitude and distribution of the flow velocity of the inner flow field are regulated, and the negative impact of the outer flow field on the inner flow field is blocked. , so as to obtain a water flow field structure suitable for arranging the entrance of the fishway.

[0023] The flow field adjustment method described in this embodiment is mainly for the main flow of the river channel to be arranged on the bank side of the fish channel, or the mainstream o...

Embodiment 2

[0029] This embodiment is an adjustment system of the river channel flow field at the entrance of the fishway designed according to the method described in the first embodiment, such as figure 1 shown. The system described in this embodiment includes: the flow field adjustment facility is a diversion wall 1, the horizontal cross-sectional shape of the diversion wall is a long strip with a straight longitudinal axis, and the longitudinal axis of the diversion wall is related to the flow direction of the river channel. 2 at an angle α , the starting end of the diversion wall is kept a certain distance from the river bank where the entrance of the fishway is set L , the height of the diversion wall is from the bottom of the water to above the water surface.

[0030] The principle of the diversion wall to adjust the flow field of the river channel is: the diversion wall and the bank 4 where the fishway inlet 3 is set form a water inlet 5 with a certain width. By adjusting the s...

Embodiment 3

[0035] This embodiment is an improvement of the second embodiment, and is a refinement of the second embodiment about the diverter wall. The angle between the longitudinal axis of the diverter wall described in this embodiment and the flow direction of the river α 10-30 degrees. When the angle between the longitudinal axis of the distributary wall and the flow direction of the channel gradually increases, the adjustment effect of the distributary wall on the inner flow field gradually increases, and the blocking effect on the downward flow of the outer water gradually increases. For most projects, the angle between 10-30 degrees is more suitable, which can not only adjust the internal flow field well, but also will not significantly block the downward flow of the external water.

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PUM

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Abstract

The invention relates to an adjusting method and a system of a river channel flowing field in a fishway inlet. The system comprises a shunt wall; the horizontal section of the shunt wall is a strip with longitudinal axis as a straight line; a certain angle is formed between the longitudinal axis of the shunt wall and the flowing direction of a river channel; a certain distance is kept from a starting end of the shun wall to a river bank provided with the fishway inlet; and the height of the shunt wall is from the water bottom to above the water surface. A flowing field adjusting facility is adopted to divide a water current flowing field in the fishway inlet into an outer side flowing field and an inner side flowing field; a flowing field suitable for migratory fishes is generated on the inner side flowing field; meanwhile, the outer side flowing field is prevented from disturbing the inner side flowing field; and a high-flowing-speed belt in a shunt inlet is used for stopping the fishes from crossing over the fishway inlet. The system uses the river water current power for adjusting the flowing fields, effectively adjusts local flowing fields of the river channel, is suitable for migration gathering of target fishes, and provides convenience for arrangement of the fishway inlet. The flowing field adjusting system is simple in structure, is low in construction amount, needs no more maintenance, is economical, and is suitable for various hydraulic projects.

Description

technical field [0001] The invention relates to a method and system for adjusting a river flow field at the entrance of a fishway, which is a hydraulic method and facility, and a hydraulic method and facility for ecological protection of fish in a river. Background technique [0002] Generally speaking, the water flow field at the entrance of the fishway should meet two conditions: one is suitable for fish to gather, and the other is to enable fish to quickly find the entrance of the fishway. Influenced by water flow conditions and topographical conditions, the structure of the downstream channel flow field of the actual sluice and dam project is very complex and changeable, which poses a huge challenge to the selection and design of the inlet position of the fishway. [0003] The entrance of the fishway is located downstream of the dam, and the flow rate is usually high. When selecting the site for the entrance of the fishway, although you can choose a location where the wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/08
CPCE02B8/085Y02A40/60
Inventor 孙双科李广宁郑铁刚柳海涛姜涵乔明秋陈晴龙文张超
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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