Interchange vertical seam type fishway

Abstract

The invention provides an interchange vertical seam type fishway, and relates to the technical field of water conservancy and hydropower ecological protection, the interchange vertical seam type fishway comprises a main fishway, a plurality of branch fishways are arranged on the main fishway, the slopes of the main fishway and the plurality of branch fishways are gradually distributed from large to small, and the set number of the branch fishways is determined according to the types of fishes passing through a water area where the fishway is located. One branch fishway is additionally arranged for each more fish passing type with different preference flow rates in the water area, and the main fishway and the branch fishway share the same fishway inlet and the same fishway outlet. The method has the advantages that the difference of the swimming capacity of a complex fish ecosystem in the actual operation working condition is fully considered, and migration channels with differentiated gradient and hydraulics conditions are provided for fishes with different swimming capacities respectively.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and hydropower ecological protection, in particular to an overpass vertical slot type fishway. Background Art

[0002] According to the "Design Specifications for Fish Passage Facilities in Hydropower Projects" (NB / T35054-2015), the slope of the fishway should be between 1:10 and 1:30 (i.e. 0.03-0.1). The purpose of the design of the fishway slope is to construct suitable hydraulic conditions for the fishway pool chamber, attracting fish to pass through the fishway pool chamber step by step and successfully swim upstream to the upstream section of the dam. Changes in the slope of the fishway cause changes in the flow pattern and velocity of the water flow inside the fishway, which in turn affects the fish passing effect. For example, Mao Xi et al. found in a mathematical model that the slope of the bottom plate affects the flow velocity of the water flow in a conventional pool. If the slope of the bottom plate decreases, the water flow velocity decreases accordingly. When the slope of the bottom plate is reduced by half, the average flow velocity of the vertical seam section is reduced to about 0.8 times.

[0003] In actual engineering cases, there are many fish passing through fishways, and different types of fish have different swimming abilities and obvious differences in their ability to overcome currents. For example, the most common fish passing through fishway projects in rivers in southwest my country are the four major carps, schizothorax, and cobwebs. According to existing literature records, the induced flow velocities of the four major carps, schizothorax, and cobwebs are 3.0, 1.67, and 3.22 BL / s, respectively, and the induced flow velocities of schizothorax and cobwebs are 1.27 and 2.09 BL / s, respectively; the burst unfatigued swimming speeds of the four major carps, schizothorax, and cobwebs are 8.13, 9.27, and 9.61 BL / s, respectively, and the burst unfatigued swimming speeds of schizothorax and cobwebs are 7.64 and 7.77 BL / s, respectively. The flow rate at the fishway inlet is generally designed to not exceed the burst swimming speed, while the flow rate in the fishway pool is generally designed to be greater than the induced flow rate and less than the burst swimming speed.

[0004] The flow pattern and flow rate of a single fishway with a fixed slope are relatively simple, making it difficult to form a flow condition that meets the needs of fish with different swimming abilities. Therefore, relevant researchers have developed variable slope fishways: such as the authorization announcement number CN213926161U (a variable slope assembled fishway) and the authorization announcement number CN112376513B (a variable slope assembled fishway and slope control system). The above patents are to set up a slope channel between the upstream and downstream waters of the river-blocking structure, install an assembleable fishway body in the slope channel, and suspend the fishway body by connecting the lifting device through the support beam placed above the channel, and further realize the change of the overall elevation and slope of the fishway by lifting and lowering the lifting device; another example is the authorization announcement number CN114892611B (a vertical slit fishway adapted to the upstream migration of multiple target fish), each fishway pool is set up as two bottom plates that rotate around the first axis to change the slope, and construct a variety of slope combinations of fishway operation conditions to dynamically adapt to the simultaneous upstream migration of multiple fish. However, the above technologies are all based on the assumption that a single fishway has a single slope. The change in the slope in a single fishway can only cause a single flow condition and flow velocity gradient, and does not take into account the stress response of different swimming abilities to the hydraulic conditions of the fishway when multiple fish pass through the same fishway at the same time (especially fish with weak swimming abilities that find it difficult to overcome large slopes will find it difficult to swim upstream). Therefore, it is necessary to explore a multi-channel fishway that can adapt to fish with different swimming abilities, and at the same time, through the screening and classification of appropriate nodes, further accurate screening in the intermediate links, to provide differentiated upstream channels for many fish, which has a strong practical inspiration for improving the efficiency of fish passage in fishways. Summary of the invention

[0005] The present invention provides an overpass vertical slot fishway, aiming to solve at least one technical problem existing in the prior art mentioned in the background technology.

[0006] The present invention provides the following technical solutions to achieve the above objectives:

[0007] A vertical slot fishway at an interchange comprises a main fishway, on which a plurality of branch fishways are arranged. The slopes of the main fishway and the branch fishways are successively allocated from large to small. The number of branch fishways is determined according to the types of fish passing through the water area where the fishway is located. For each additional type of fish that prefers a different flow rate in the water area, one more branch fishway is arranged. The main fishway and the branch fishways share the same fishway inlet and outlet.

[0008] Furthermore, the main fishway and the branch fishway are both vertical slot fishways, which include a fishway bottom plate, fishway side walls are arranged on both sides of the fishway bottom plate, fishway partitions are arranged at intervals in the fishway side walls, and the front and rear adjacent fishway partitions and fishway side walls are enclosed as fishway pool rooms, and a fishway rest pool is arranged every several fishway pool rooms in the vertical slot fishway.

[0009] Furthermore, the branch fishway is connected to the fishway resting pool of the main fishway.

[0010] Furthermore, a transfer channel is provided between the main fishway and the branch fishway, and between several branch fishways, and the elevation of the transfer channel connecting one end of the high-slope fishway is greater than the elevation of the transfer channel connecting one end of the low-slope fishway.

[0011] Furthermore, both ends of the transfer channel are respectively connected to the fishway resting pool of the main fishway or the branch fishway.

[0012] Furthermore, the transfer channel includes a slideway, with gates provided at both ends of the slideway, the gates being rotatably connected to the side wall of the fishway through positioning pins, a steel wire rope being provided at one end of the gate away from the positioning pin, the other end of the steel wire rope being connected to a motor, the motor being provided on a motor support platform, and the motor support platform being provided at the top of the side wall of the fishway.

[0013] Furthermore, a temporary fish pond is arranged at the lower end of the slideway near the gate, and the temporary fish pond is arranged in a concave shape.

[0014] Furthermore, a water replenishment system is also provided on the transfer channel, and the water replenishment system includes a plurality of water replenishment pipes arranged along the length of the transfer channel, and the water replenishment pipes are provided with spray outlets at the gates at both ends of the transfer channel; when the gates are opened, the spray outlets and the gates are inclined in the opposite direction to the inclination direction of the slideway, and the end of the water replenishment pipe away from the transfer channel is commonly connected to a water pipe inlet, and the water pipe inlet extends into the reservoir area upstream of the dam.

[0015] Furthermore, a rough interface for attachment of pebbles and gravels to the bottom material is arranged on the side of the gate facing the fishway, and a sealing collar is arranged around the gate.

[0016] A method for operating an overpass vertical slot fishway comprises the following steps:

[0017] S1. When fish that need to migrate upstream enter the fishway, the gate and the spout are opened so that the transfer channel connects the main fishway and the branch fishway;

[0018] S2. Based on their different swimming abilities, the fish are attracted by the water flow ejected from the spout and enter different fishways through the transfer channels;

[0019] S3. The fish species migrate upstream in different fishways and eventually converge at the fishway exit and enter the waters upstream of the dam;

[0020] S4. When the migratory fish species is single, close the gate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Innovative flyover-type coordinated fish passage over the dam. The flyover vertical seam fishway designed in this application, which is based on the main fishway and supplemented by several branch fishways, fully considers the differences in swimming ability of complex fish ecosystems in actual operating conditions, and provides fish with different swimming abilities with migration channels with differentiated slopes and hydraulic conditions. Specifically, each fishway shares a fishway inlet and fishway outlet, and a transfer channel is set at the appropriate fishway rest pool position in each fishway. The waterways between the main fishway and the branch fishway, and between the branch fishways can be connected or separated through the transfer channel. The fish with insufficient swimming ability are guided to be diverted step by step through the connection, realizing an flyover-type migration channel mode with precise allocation of migration channels, flexible interweaving of migration routes, and orderly migration process.

[0023] 2. A multi-channel diversion and confluence fish passage mode has been created. This application uses the swimming ability of fish as the design basis, and diverts fish of different swimming abilities step by step to fish passages with different slopes and hydraulic conditions. Among them, after multiple fish species swim upstream for a short distance in the main fishway, fish with strong swimming abilities continue to swim upstream along the main fishway until they pass through the fishway exit and migrate across the dam. Fish with medium and weakest swimming abilities complete the first diversion process in the rest pool in the main fishway, and enter the branch fishway A with a medium slope and a medium water flow rate through the transfer channel. Then, fish with the weakest swimming ability are diverted to the branch fishway B with the lowest slope and the lowest water flow rate in a similar manner. The diverted fish eventually converge again through their respective branch fishways and enter the end of the main fishway, and finally enter the water body upstream of the dam. The innovative multi-channel diversion and confluence method for fish crossing the dam in this application takes into account the differences in the swimming abilities of multiple fish species, and overcomes the key problem that the single slope of the traditional fishway and the single hydraulic conditions it produces restrict the efficiency of multiple fish species migrating across the dam.

[0024] 3. An eco-friendly, flexible and economical transfer channel is constructed. The transfer channel constructed in this application is a key link in connecting the main fishway with the branch fishway, the waterways between the branch fishways and the fish migration. When diversion and convergence are required, the gate is lowered and presented to a certain slope through the motor-controlled wire rope, and connected with the slide and the temporary fish pond. Not only can part of the fishway side wall be efficiently and flexibly transformed into a fish transfer ramp, but also the resources of the transfer channel structural components are saved; a temporary fish pond is set at the end of the slide for the transfer fish to temporarily rest, exercise and restore their swimming ability, providing appropriate transfer space for the fish that may lose their way after the transfer slide, and then climb up the gate ramp to migrate to the next level of branch fishway to complete the diversion, which is extremely ecologically beneficial. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The general plan layout of the present invention (water replenishment system is not shown);

[0026] Figure 2 Overall structure of the present invention Figure 1(display water replenishment system);

[0027] Figure 3 Overall structure of the present invention Figure 1 (Water replenishment system not shown);

[0028] Figure 4 Overall structure of the present invention Figure 1 (display water replenishment system);

[0029] Figure 5 Overall structure of the present invention Figure 2 (Water replenishment system not shown);

[0030] Figure 6 Overall structure of the present invention Figure 2 (display water replenishment system);

[0031] Figure 7 Transport channel structure of the present invention Figure 1 (gate opens);

[0032] Figure 8 Transport channel structure of the present invention Figure 1 (gate closed);

[0033] Fig. 9 Partial cross-sectional view of the fishway structure of the present invention. Figure numerals: 1-main fishway; 2-branch fishway A; 3-branch fishway B; 4-transfer channel; 401-motor support platform; 402-gate; 403-motor; 404-wire rope; 405-positioning pin; 406-slideway; 407-temporary fish pond; 5-fishway inlet; 6-fishway outlet; 7-fishway side wall; 8-fishway bottom plate; 9-fishway partition; 10-fishway pool room; 11-fishway rest pool; 12-support column; 13-water replenishment system; 1301-water pipe inlet; 1302-water replenishment pipe; 1303-water pump; 1304-spout. DETAILED DESCRIPTION

[0034] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0035] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] Embodiment. A vertical slot fishway of an interchange, the structure of which is referenced to Figures 1 to 8 , including a main fishway 1, on which a plurality of branch fishways are arranged, the slopes of the main fishway 1 and the plurality of branch fishways are successively allocated in a descending order, the number of branch fishways is determined according to the types of fish passing through the waters where the fishway is located, and one more branch fishway is arranged for each additional type of fish passing through the waters that prefers a different flow rate, the main fishway 1 and the branch fishways share the same fishway inlet and fishway outlet; the main fishway 1 and the branch fishways are both vertical slit fishways, the vertical slit fishway includes a fishway bottom plate 8, fishway side walls 7 are arranged on both sides of the fishway bottom plate 8, and the fishway side walls Fishway partitions 9 are arranged at intervals in the wall 7, and the front and rear adjacent fishway partitions 9 and the fishway side walls 7 enclose a fishway pool chamber 10. A fishway rest pool 11 is arranged every several fishway pool chambers 10 in the vertical slot fishway; the branch fishway is connected to the fishway rest pool 11 of the main fishway 1; the present application is an overpass vertical slot fishway with the main fishway 1 as the main body and several branch fishways as supplements, which fully considers the differences in swimming ability of the complex fish ecosystem in actual operating conditions, and provides migration channels with differentiated slopes and hydraulic conditions for fish with different swimming abilities.

[0038] A transfer channel 4 is also provided between the main fishway 1 and the branch fishway, and between several branch fishways. The elevation of the end of the transfer channel 4 connected to the high-slope fishway is greater than the elevation of the end connected to the low-slope fishway. Both ends of the transfer channel 4 are respectively connected to the fishway rest pool 11 of the main fishway 1 or the branch fishway; Figure 7 and 8As shown, the left end of the transfer channel 4 with a higher elevation is connected to the fishway with a higher slope, and the right end of the transfer channel 4 with a lower elevation is connected to the fishway with a lower slope; the transfer channel 4 includes a slide 406, and gates 402 are arranged at both ends of the slide 406; the gate 402 is rotatably connected to the fishway side wall 7 through a positioning pin 405, and a steel wire rope 404 is arranged at the end of the gate 402 away from the positioning pin 405, and the other end of the steel wire rope 404 is connected to a motor 403, and the motor 403 is arranged on a motor support platform 401, and the motor support platform 401 is arranged at the top of the fishway side wall 7; the fishway rest pool 11 is connected to the transfer channel 4 through the gate 402, and when diversion and convergence are required, the steel wire rope 404 is controlled by the motor 403 to lower the gate 402, and connect with the slide 406 and the temporary fish pond 407, which not only efficiently and flexibly changes part of the fishway side wall into a fish transfer ramp, but also saves resources of the transfer channel structural components.

[0039] A temporary fish pond 407 is arranged at the lower end of the slide 406 near the gate 402, and the temporary fish pond 407 is arranged in a concave shape. The temporary fish pond 407 is provided to provide an environment for the transferred fish to temporarily rest, exercise and restore their swimming ability, and to provide an appropriate transfer space for the fish that may lose their way after the transfer slide.

[0040] The transfer channel 4 is also provided with a water replenishment system 13, which includes a plurality of water replenishment pipes 1302 arranged along the length of the transfer channel 4. The water replenishment pipes 1302 are provided with spray ports 1304 at the gates 402 at both ends of the transfer channel 4. When the gates 402 are opened, the spray ports 1304 and the gates 402 are inclined in the opposite direction to the inclined direction of the slideway 406; Figure 7 As shown, the gate 402 is tilted in a manner of being low on the left side and high on the right side, and the water spraying angle of the spray outlet 1304 is set at the same angle as the tilt angle of the gate 402; the end of the water supply pipe 1302 away from the transfer channel 4 is commonly connected to the water pipe inlet 1301, and the water pipe inlet 1301 extends into the reservoir area upstream of the dam; by tilting the angle of the gate 402 when it is opened, it cooperates with the spray outlet 1304, so that the water sprayed from the spray outlet 1304 flows out along the gate 402, and provides suitable water flow conditions for fish to swim upstream.

[0041] A rough interface for attachment of gravel substrate is arranged on the side of the gate 402 facing the fishway, and a sealing collar is arranged around the gate 402 to ensure the sealing of the gate 402 when it is closed.

[0042] Fish online monitoring equipment such as video surveillance or sonar is installed in each fishway resting pool 11, and the water in the temporary fish pond 407 is replaced regularly to keep the water quality up to standard. The water level in the temporary fish pond 407 should be flush with the end of the gate 402 when it is lowered, and gravel substrate and aquatic plants are arranged at the bottom of the temporary fish pond 407.

[0043] A method for operating an overpass vertical slot fishway comprises the following steps:

[0044] S1. When fish that need to migrate upstream enter the fishway, the gate and the spout are opened so that the transfer channel connects the main fishway and the branch fishway;

[0045] S2. Based on their different swimming abilities, the fish are attracted by the water flow ejected from the spout and enter different fishways through the transfer channels;

[0046] S3. The fish species migrate upstream in different fishways and eventually converge at the fishway exit and enter the waters upstream of the dam;

[0047] S4. When the migratory fish species is single, close the gate.

[0048] Application example. This application example adopts a combination structure including 1 main fishway 1, 1 branch fishway A2 and 1 branch fishway B3 when the water area contains four major carps, schizothorax and cod. The main fishway 1 has the largest slope, the branch fishway A2 has the second largest slope, and the branch fishway B3 has the smallest slope. Because the fishways share a fishway inlet and a fishway outlet, when the incoming water conditions do not change, according to the slope relationship, the flow rate of the main fishway 1 is the largest, the flow rate of the branch fishway A2 is the second largest, and the flow rate of the branch fishway B3 is the smallest. By opening the main gate at the fishway outlet, the amount of water entering the fishway is controlled, so that The water flow presents different flow rates in the main fishway 1, branch fishway A2 and branch fishway B3; the water flow rate of the main fishway 1 is controlled between the induced flow rate and the burst swimming speed of the Cobitidae fish, because the induced flow rate and the burst swimming speed of the Cobitidae fish are the strongest among the three categories of the four major carps, schizothorax and Cobitidae fish. When the water flow rate of the main fishway 1 meets the migratory habits of the Cobitidae fish, according to the aforementioned slope relationship, the water flow rates in the branch fishways A2 and B3 are suitable for fish whose migratory ability is not as good as that of the Cobitidae fish, that is, the four major carps and schizothorax. At this time, the application is operated in the following manner:

[0049] 1. Diversion preparation

[0050] All the fish passing targets are attracted by the 5 fish trapping conditions at the fishway entrance and gradually enter the fishway. At this time, the gate 402 at the fishway resting pool 11 connecting the main fishway 1 and the branch fishway A2, and the branch fishway A2 and the branch fishway B3 is opened, so that the gate 402 is connected to the slide 406.

[0051] 2. Diversion Implementation

[0052] All fish pass through the main fishway 1 and swim upstream for a distance. Under the same hydraulic conditions and fishway slope, different fish will have initial responses due to their different swimming abilities:

[0053] ① The fish of the family Coquididae, which have the strongest swimming ability, continue to swim upstream along the main fishway 1 until they exit the fishway 6 and enter the waters upstream of the dam;

[0054] ② After the four major carps with the second-best swimming ability and the weakest schizothorax fish go upstream along the main fishway 1 for a distance, they gather in the first-level fishway resting pool 11 to temporarily rest and wander due to their insufficient swimming ability and inability to tolerate the slope and water flow conditions of the main fishway 1; the water pump 1303 is turned on to draw the water flow from the reservoir to the upstream of the slope of each gate 402, and the flow rate and flow velocity of the spray outlet 1304 are regulated by the water pump 1303 to create water flow conditions that attract fish to go upstream, attracting the four major carps and schizothorax fish to go upstream along the gate 401 to the top, and then slide down the slide 406 into the temporary fish pond 407; after staying in the temporary fish pond 407 to rest, exercise and restore their swimming ability, the fish school climbs up along the gate 402 again to the branch fishway A2.

[0055] 3. Convergence Implementation

[0056] ① The four major carps continue to swim upstream along the branch fishway A2 until they reach the intersection of the branch fishway A2 and the main fishway 1 and re-enter the main fishway 1, and then enter the waters upstream of the dam along the fishway exit 6;

[0057] ② After swimming upstream for a distance in the branch fishway A2, the schizothorax with the weakest swimming ability gathers in the fishway rest pool 11 in the branch fishway A2 to temporarily rest and wander due to insufficient swimming ability and inability to tolerate the slope and water flow conditions of the branch fishway A2. They enter the branch fishway B3 in a manner similar to steps ① and ② in S2, and continue to swim upstream along the branch fishway B3 until they reach the intersection of the branch fishway B3 and the main fishway 1 and enter the main fishway 1 again, and enter the waters upstream of the dam along the fishway exit 6.

[0058] 4. Conventional migration mode

[0059] When the migratory fish species faced by the fishway are of a single type and have the same swimming ability, the transfer channel 4 between the branch fishway A2 and the branch fishway B3 and between the main fishway 1 and the branch fishway A2 can be closed, and the traditional vertical slit fishway mode with the main fishway 1 as the only migratory channel can be restored. Specifically, the motor 403 controls the steel wire rope 404 to lift the gate 402 to connect with the side wall of the fishway, and the sealing collar is used to block the connection between the inside of the fishway and the outside world, thereby achieving the closure of the side wall of the fishway.

[0060] Obviously, the above is only a part of the embodiments of the present invention, not all of the embodiments. The above embodiments are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any combination, modification, equivalent replacement, improvement and all other embodiments that can be made by those of ordinary skill in the art within the spirit and principle of the present invention should be within the protection scope of the present invention.

Claims

1. An overpass vertical slot fishway, characterized in that: The invention comprises a main fishway, on which a plurality of branch fishways are arranged. The slopes of the main fishway and the branch fishways are allocated in sequence from large to small. The number of branch fishways is determined according to the types of fish passing through the waters where the fishway is located. For each additional type of fish that prefers a different flow rate in the waters, one more branch fishway is arranged. The main fishway and the branch fishways share the same fishway inlet and outlet.

2. The vertical slot fishway according to claim 1, characterized in that: The main fishway and the branch fishway are both vertical slot fishways, which include a fishway bottom plate, fishway side walls are arranged on both sides of the fishway bottom plate, fishway partitions are arranged at intervals in the fishway side walls, and the front and rear adjacent fishway partitions and fishway side walls are enclosed as fishway pool rooms, and a fishway rest pool is arranged every several fishway pool rooms in the vertical slot fishway.

3. The flyover vertical slot fishway according to claim 1, characterized in that: The branch fishway is connected to the fishway resting pool of the main fishway.

4. The vertical slot fishway according to claim 1, characterized in that: A transfer channel is also arranged between the main fishway and the branch fishway, and between several branch fishways. The elevation of the transfer channel connecting one end of the high-slope fishway is greater than the elevation of the end connecting the low-slope fishway.

5. The flyover vertical slot fishway according to claim 4, characterized in that: Both ends of the transfer channel are respectively connected to the fishway resting pool of the main fishway or the branch fishway.

6. The flyover vertical slot fishway according to claim 4, characterized in that: The transfer channel includes a slideway, with gates arranged at both ends of the slideway. The gates are rotatably connected to the side wall of the fishway through positioning pins. A steel wire rope is arranged at one end of the gate away from the positioning pin. The other end of the steel wire rope is connected to a motor. The motor is arranged on a motor support platform, and the motor support platform is arranged at the top of the side wall of the fishway.

7. The flyover vertical slot fishway according to claim 6, characterized in that: A temporary fish pond is arranged at one end of the slideway with a lower elevation, near the gate, and the temporary fish pond is arranged in a concave shape.

8. The flyover vertical slot fishway according to claim 4, characterized in that: The transfer channel is also provided with a water replenishment system, which includes a plurality of water replenishment pipes arranged along the length of the transfer channel, and the water replenishment pipes are provided with spray outlets at the gates at both ends of the transfer channel; when the gates are opened, the spray outlets and the gates are inclined in the opposite direction to the inclination direction of the slideway, and the ends of the water replenishment pipes away from the transfer channel are commonly connected to a water pipe inlet, and the water pipe inlet extends into the reservoir area upstream of the dam.

9. The flyover vertical slot fishway according to claim 6, characterized in that: A rough interface for the attachment of pebbles and gravels to the bottom material is arranged on the side of the gate facing the fishway, and a sealing collar is arranged around the gate.

10. The method for operating the flyover vertical slot fishway according to claim 8, characterized in that: The steps include: S1. When fish that need to migrate upstream enter the fishway, the gate and the spout are opened so that the transfer channel connects the main fishway and the branch fishway; S2. Based on their different swimming abilities, the fish are attracted by the water flow ejected from the spout and enter different fishways through the transfer channels; S3. The fish species migrate upstream in different fishways and eventually converge at the fishway exit and enter the waters upstream of the dam; S4. When the migratory fish species is single, close the gate.

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