A dual-channel fish swarm tracing aid device and method

Abstract

This invention discloses a dual-channel fish traversal aid device and method, belonging to the field of fish passage facilities in water conservancy engineering. It includes a fish inlet, a fish collection pond, an intelligent fish identification and attraction system, and dual-channel fish passage sections. The intelligent fish identification and attraction system in the fish collection pond identifies and guides fish entering the fish passages, achieving diversion: the outer fish passage is for large predatory and migratory fish, while the inner fish passage is for mid- and bottom-dwelling fish such as cyprinids and catfish. A porous basalt partition wall is installed between the two chambers of the dual-channel fish passage section, providing hiding and escape space for juvenile and vulnerable fish that mistakenly enter the outer fish passage, reducing the loss rate. The two fish passages respectively employ sloping and stepped cascade units to create suitable water flow conditions. The integrated structure reduces construction costs. By combining food chain relationships and fish habits, physical isolation and intelligent guidance are combined to improve fish survival rates and traversal success rates, protecting aquatic habitats and biodiversity.

Description

Technical Field

[0001] This invention belongs to the field of fishway design in water conservancy engineering, specifically a dual-channel fish tracing aid device and method. Background Technology

[0002] With the rapid development of global water resource development and water conservancy engineering, the problem of the disruption of river ecosystems caused by man-made structures such as dams and sluices is becoming increasingly prominent. According to statistics, about 60% of migratory fish populations worldwide are declining due to obstructed migration routes, directly threatening aquatic biodiversity and ecological balance.

[0003] Traditional fishway designs often employ a single structural form (such as pool-type, trough-type, or Daniell-type fishways), which have significant limitations. For example, pool-type fishways create a stepped water flow through continuous cascading pools, but are sensitive to water level fluctuations (allowable height differences are usually <5m), and the turbulence between pools can easily exhaust fish. Daniell-type fishways use inclined troughs with baffles to generate spiral flow, which can reduce flow velocity (0.8~1.5m / s), but their linear structure leads to a limited range of target fish species, with a success rate of less than 15% for bottom-dwelling fish (such as cyprinids). Vertical slotted fishways regulate water flow through vertical slots, but the slot width is fixed (usually 0.3~0.5m), making it difficult to accommodate fish of various body sizes (such as adult Chinese sturgeon, which can reach a width of 0.7m), and can easily cause lateral line sensing disorder. The above-mentioned fishways all have drawbacks to varying degrees. First, the fixed structure is difficult to adapt to complex terrain and changes in hydrological conditions, resulting in uneven distribution of flow velocity and low fish attraction efficiency. Second, there is a lack of differentiated response mechanisms to the migratory behaviors of different fish species (such as jumping height and current-following characteristics), and the passage rate of juvenile fish and vulnerable populations is less than 30%. Third, traditional fishways have high operation and maintenance costs and lack dynamic adjustment capabilities in the face of sudden hydrological events (such as floods and droughts).

[0004] In recent years, while modular ecological fishways have partially solved the adaptation problem, they have mostly remained at the level of physical structure assembly, failing to achieve multi-dimensional synergy between flow simulation, biological behavior guidance, and ecological materials. Therefore, there is an urgent need for a new fishway technology system with fish school guidance and recognition, multi-target species compatibility, and full life-cycle sustainability to reconstruct fragmented river ecological corridors. Summary of the Invention

[0005] The purpose of this invention is to design an intelligent dual-channel fish swarm traversal aid structure that is adapted to multiple target fish species by rationally designing fishways into different channels and zones, further integrating bionic principles, and combining it with an intelligent fish identification and attraction system. This addresses the following existing problems: existing fishways are highly selective in terms of fish species, and traditional designs mostly target fish species with high swimming ability (such as adult salmonids), neglecting vulnerable fish species (juveniles, cyprinids, benthic fish, and invertebrates); secondly, most existing fishways lack behavioral guidance mechanisms and do not adequately utilize fish tactic behaviors (flow attraction, obstacle avoidance); on the other hand, the homogeneous flow field formed by the single structure of traditional fishways cannot simulate the velocity gradient of natural rivers, causing some vulnerable fish to have difficulty locating and become disoriented.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The beneficial effects of this invention are: This invention significantly improves fish passage rate and ecological compatibility by employing a multi-channel design to provide suitable upstream passages for fish of different food chain levels, habits, and body sizes.

[0007] The present invention features a semi-cylindrical guide post at the fish inlet, which can generate a vortex-induced fish-attracting zone at the fishway inlet, thereby improving the fish passage rate. This invention utilizes an intelligent AI fish attraction system that integrates an infrasound fish attractor, a high-speed camera, and a bubble curtain system to guide and identify fish entering the fish passage and fish collection pond, and effectively isolate them physically. This greatly improves the survival rate of vulnerable fish and juvenile fish in the fish passage and further enhances the success rate of fish swarms surfacing. This invention provides suitable water flow conditions for carp, catfish, and aquatic invertebrates that prefer slow-flowing natural river environments by laying a natural pebble-like substrate on the bottom plate of the inner side of the fishway section. This expands the passage space for weaker fish species and increases the diversity of fish populations passing through the fishway. This invention provides a passage for juvenile and vulnerable fish that have accidentally entered the outer predatory fish passage by setting up a porous basalt partition wall in the partition wall shared between the inner and outer fish passages of each layer, thereby further improving the survival rate of fish in the fish passage. The compact design of this invention reduces construction and operating costs, and the dual-channel interconnected design also provides a new solution for the current fishway design field; The structure of this invention can also be flexibly adjusted according to the characteristics of local river fish populations and engineering needs, making it highly adaptable and easy to promote. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of the fishway; Figure 2 This is a top view of the fishway; Figure 3 This is a diagram showing the fish inlet. Figure 4 Schematic diagram of a fish passage and fish collection pond; Figure 5 This is a schematic diagram of the intelligent fish-attracting control room; Figure 6 This is a schematic diagram of a dual-channel fishway. Figure 7 Schematic diagram of the outer double-channel fish passage; Figure 8 This is a schematic diagram of the inner double-channel fish passage. Figure 9 This is a diagram of the rest area at the turn. Detailed Implementation

[0009] The embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of, and not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0010] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of this invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of this invention.

[0011] In the description of this invention, it should be noted that the terms "center", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0012] Example 1: Please refer to Figures 1-9 A dual-channel fish tracing aid device includes a fish inlet 1, a fish collection pond 2, an intelligent fish identification and attraction system 3, and one or more dual-channel fishway sections 4. The fish inlet 1 is connected to the fish collection pond 2, the intelligent fish identification and attraction system 3 is installed at the fish collection pond 2, and the fish collection pond 2 is connected to the dual-channel fishway section 4. The dual-channel fishway section 4 includes an outer fishway chamber and an inner fishway chamber. The fish inlet 1, located downstream of the fishway water flow, is connected to the outer sidewall 41 of the dual-channel fishway section 4 through a guide wall 11 to form a whole, and then docks with the fish collection pond 2.

[0013] Furthermore, the dual-channel fishway segment 4 includes more than two, such as... Figure 1In this embodiment, there are two dual-channel fishway sections 4. The end of the fish inlet 1 is combined with the end of the first dual-channel fishway section 4 and connected to the opening end of the fish collection pool 2. The other end of the dual-channel fishway section 4 is connected to one end of the turning rest area 5. The other end of the rest area 5 is connected to another dual-channel fishway section 4. The two adjacent dual-channel fishway sections 4 are connected through the turning rest area 5. After the connection, the outer fishway pool chambers of the two adjacent dual-channel fishway sections 4 are interconnected, and the inner fishway pool chambers of the two adjacent dual-channel fishway sections 4 are interconnected.

[0014] Furthermore, such as Figure 3 As shown, the fish inlet 1 includes a guide wall 11, a base plate 12, and several semi-cylindrical turbulence piles 13 spaced apart. The semi-cylindrical turbulence piles 13 are located on the base plate 12, with their cylindrical surfaces facing the fish collection pond 2. The size and density of the semi-cylindrical turbulence piles on the base plate 12 can be reasonably arranged according to actual engineering needs. Their function is to create a vortex zone that attracts fish in the river when the water flows out of the fishway and passes through the semi-cylindrical turbulence piles 13 at the fish inlet 1, thereby attracting the fish to the fish collection pond and further improving the fish attraction rate.

[0015] Furthermore, such as Figure 4-5 As shown, the fish collection pond 2 includes a fish collection pond bottom plate 24 and a first side wall 21, a second side wall 22, and a third side wall 23 fixed thereon. The intelligent fish attraction system 3 includes a bubble curtain air outlet 25, a high-speed camera 27, an infrasound fish attractor 26, a bubble curtain air supply pipe 32, and an intelligent fish attraction control room 31. The first side wall 21 of the fish pond is far away from the fish inlet 1. The third side wall 23 of the fish collection pond is opposite to the first side wall 21. The second side wall 22 of the fish collection pond is located between the first side wall 21 and the third side wall 23 and is directly opposite the dual-channel fish passage section 4. The infrasonic fish attractor 26 is located on the first side wall 21 of the fish collection pond. The high-speed camera 27 is located on the second side wall 22 of the fish collection pond and is on the same vertical plane as the bubble curtain air outlet 25. The bubble curtain air outlet 25 is on the same plane as the middle side wall of the dual-channel fish passage section 4. The bubble curtain air outlet 25 is installed below the bottom plate 24 of the fish collection pond and is connected to the bubble curtain air supply pipe 32. The air output of the bubble curtain air outlet 25 is controlled by the control system of the intelligent fish attraction control room 31. The high-speed camera 27 is connected to the intelligent fish attraction control room 31. The first side wall 21, the second side wall 22, and the second side wall 23 of the fish collection pool are combined to form a fish collection pool, which is connected to the double-channel fish passage section 4 and the fish inlet 1.

[0016] The infrasonic fish attractor 26, installed on the first side wall 21 of the fish collection pond, continuously emits directional frequencies to attract juvenile fish and mid-to-bottom-dwelling fish, effectively attracting target fish to the inner fishway and enabling them to successfully swim upstream. Meanwhile, the high-speed camera 27, installed on the second side wall 22 of the fish collection pond, transmits underwater fish images in real time to the intelligent AI recognition system in the intelligent fish identification and control room 31. The AI ​​recognition function accurately identifies, classifies, and counts the fish in the fish collection pond 2, effectively counting the fish entering the fishway. This provides strong data support for the statistical work on fish populations in the river area and provides a basis for further understanding the operational efficiency of the fish-assisted swimming structure, allowing for timely adjustments to the entire structure and increasing fish passage.

[0017] Furthermore, the dual-channel fishway section 4 includes an outer sidewall 41, an inner sidewall 42, a middle sidewall 43, an outer sloping bottom plate 44, an inner stepped bottom plate 45, a double vertical seam fishway partition 46, a "U"-shaped baffle 47, a porous basalt partition wall 48, and a simulated natural pebble matrix 49; the outer sidewall 41, the middle sidewall 43, and the outer sloping bottom plate 44 combine to form the outer fishway chamber, and the middle sidewall 43, the inner sidewall 42, and the inner stepped bottom plate 45 combine to form the inner fishway chamber; the outer fishway chamber and the inner fishway chamber combine to form the dual-channel fishway section 4. Multiple double-vertical-slit fishway partitions 46 are spaced apart on the outer sloping bottom plate 44 to reduce the water flow velocity inside the outer fishway pool. "U"-shaped baffles 47 are arranged on the inner stepped bottom plate 45, which divides the inner fishway pool into multiple layers. Imitation natural pebble matrix 49 is laid on each layer of the inner stepped bottom plate 45. The middle side wall 43 is provided with porous basalt partitions 48 at intervals. The porous basalt partitions 48 correspond to each layer of the inner fishway pool, providing a hiding and escape passage for juvenile fish and vulnerable fish that have mistakenly entered the outer fishway pool.

[0018] Furthermore, the simulated natural pebble matrix 49 material is made entirely of natural pebbles found in the river channel where the fishway is located. By using natural pebbles from the river channel where the fishway is located as the paving material for the inner stepped bottom plate 45, the construction cost of the fishway can be effectively reduced, while also providing a more natural environment for the fish entering the fishway, resulting in a better attraction for the fish and an increased passage rate.

[0019] Furthermore, the inner stepped base plate 45 adopts a variable slope design, achieving slope variation by keeping the length of each layer constant while increasing the step height. The slope of each layer is between 3% and 7%, gradually increasing by about 1% along the water flow direction. The specific magnitude of the change can be adjusted according to the actual project requirements; its characteristic is that the slope increases smoothly and progressively along the water flow direction. Figure 1 , 2As shown in section 4 of the dual-channel fishway in the lower middle section, the first layer, located in the entrance fish-attracting area, has the steepest slope of approximately 7%, resulting in a loud cascade and high flow velocity, effectively attracting fish. The second layer, in the adaptation transition zone, has a slope of approximately 6%, gradually decreasing to help fish adapt to the ascent. The third layer, in the main ascent zone, has a slope of approximately 5%, with a standard drop and balanced flow. The fourth layer, in the recovery transition zone, has a slope of approximately 4%, significantly decreasing in slope and becoming gentler. The fifth layer, in the exit sprint zone, has a slope of approximately 3%, the gentlest slope, making it very easy to pass through and ensuring the passage of tired fish. The inner stepped bottom plates 45 of each layer are connected by steps of 0.1m to 0.5m. This variable-slope stepped connection design creates a pulsed water flow that mimics the flow of a natural stream, providing a more natural flow environment for juvenile and vulnerable fish with weaker swimming abilities, thereby further improving the overall success rate of the fishway's ascent.

[0020] Furthermore, the outer sloping bottom plate 44 has an 8% to 15% slope relative to the horizontal plane. The slope can be adjusted appropriately according to the actual engineering needs. The height of the side closer to the fish collection pond 2 is lower than the height of the other side. The slope provides a suitable flow field environment for migratory fish that prefer fast currents. This design can effectively improve the success rate of migratory fish swimming upstream.

[0021] Furthermore, the double vertical slit fishway partition 46 includes several staggered rectangular baffles 53 and baffles with hook-like structures. Rectangular baffles 53 are arranged opposite each other on the outer sidewalls 41 and middle sidewalls 43 of the outer fishway chamber. The back of the baffle with hook-like structures corresponds precisely to the outlet between the two opposing rectangular baffles 53, and a gap is left between the baffle with hook-like structures and the outlet to form a double vertical slit. The vertical slits control water flow and water level changes by forming local jets, creating a flow structure in the chamber where mainstream and backflow coexist. This provides a stable passage for fish while creating a low-velocity resting area, reducing energy consumption for fish passage and enhancing adaptability to water level fluctuations. Each inner layer of the inner fishway chamber has multiple rows and three columns of "U"-shaped baffles 47 on its inner stepped bottom plate 45. The arc-shaped surface of the "U"-shaped baffles 47 faces the water flow direction. The main function of the "U"-shaped baffles is to regulate the flow and optimize energy distribution. Its arc-shaped structure guides the mainstream to smoothly separate and diffuse to both sides, thus "dispersing" the high-speed jet and reducing local velocity peaks, minimizing the impact on fish. Simultaneously, the U-shaped structure creates a stable backflow and low-velocity buffer zone on its leeward side, providing resting space for fish and enhancing the multipath characteristics of the overall flow field, increasing the probability of fish finding the passageway. Furthermore, this structure weakens turbulence intensity, allowing water flow energy to dissipate gradually, thereby improving the overall passageability and hydraulic stability of the fishway.

[0022] Furthermore, the turning rest area 5 includes an outer side wall 51, an inner side wall 52, a rectangular baffle 53, an outer bottom plate 54, an inner bottom plate 55, and a natural pebble matrix 56. The outer side wall 51 and the inner side wall 52 form an outer fishway pool chamber connecting area of ​​two adjacent double-channel fishway sections 4. The inner side of the inner side wall 52 forms an inner fishway pool chamber connecting area of ​​two adjacent double-channel fishway sections 4. Rectangular baffles 53 are arranged at intervals on the inner sides of both the outer side wall 51 and the inner side wall 52. The natural pebble matrix 56 is laid on the inner bottom plate 55 of the rest area. The rectangular sidewalls of the rest area 5 reduce construction difficulty. The rectangular baffles 53 with multiple right-angle turns on the outer rest area and the imitation natural pebble matrix 56 laid on the inner rest area floor can reduce the water flow velocity and kinetic energy in the turning rest area 5, providing a suitable resting environment for the fish entering the turning rest area 5, effectively restoring their strength, and thus reducing the risk of the fish failing to swim upstream due to exhaustion.

[0023] Furthermore, the intelligent fish-attracting control room 31 is equipped with an intelligent AI recognition system. A high-speed camera 27 is connected to this system. The high-speed camera 27 has a resolution of 4K or higher and a frame rate of 60fps or higher. Higher resolution and frame rate effectively improve recognition accuracy, thus making the obtained data more reliable.

[0024] A dual-channel fish swarm tracing method includes the following steps: Step 1: Fish in the river enter the fish collection pond 2 through the fish inlet 1. The high-speed camera 27 transmits the underwater fish images to the intelligent AI recognition system in the intelligent fish attraction control room 31 in real time. Step 2: The infrasonic fish attractor 26 continuously emits directional frequencies to attract juvenile fish and mid-to-bottom-dwelling fish, attracting the target fish to the inner fish passage chamber. Step 3: When the intelligent AI recognition system detects large predatory fish approaching the fish collection pond 2 through the real-time footage provided by the high-speed camera 27, the bubble curtain controller in the intelligent fish attraction control room 31 will deliver gas through the bubble curtain air supply pipe 32 and release air through the bubble curtain air outlet 25 to form bubbles in the fish collection pond 2, which are used to drive away large predatory fish.

[0025] The use of intelligent fish-attracting systems enables fish entering the fishway to more accurately find the correct upstream passage, while the use of bubble curtains greatly ensures the survival rate of juvenile and vulnerable fish species that need to migrate upstream within the fishway.

[0026] The working principle of this invention is as follows: When fish in the river approach the fish inlet 1, they are attracted by the eddy current generated by the semi-cylindrical turbulence pile 13 and enter the fish collection pond 2. Among the fish in the fish collection pond 2, weaker fish species will be attracted by the infrasound fish attractor 26 and swim to one end of the inner fish passage chamber and swim upstream along the inner fish passage chamber. Meanwhile, migratory fish and carnivorous fish in the fish collection pond 2 will be attracted by the turbulence generated by the outer fish passage chamber and swim upstream through the outer fish passage chamber. If large predatory fish in the fish collection pond are attracted by weaker fish species or juvenile fish and chase them and want to approach the inner fish passage chamber, the intelligent fish identification and attraction system 31 will identify them through the video data transmitted by the high-speed camera 27 and react in time, controlling the air outlet 25 of the bubble curtain to release air to drive them away, thereby protecting the weaker fish species and juvenile fish in the fish passage as much as possible. In this way, fish at different levels of the food chain and with different preferences for water flow conditions and river environment can successfully swim upstream through their suitable channels. If any juvenile or weak fish accidentally enter the fishway in the outer pool chamber, they can escape and hide through the gaps in the porous basalt partition wall 48 set in the middle side wall 43. When the fish swim upstream to the turning rest area 5, the fish can rest and recover their strength because the water flow in the turning rest area 5 is slower. In this way, the fish continuously swim upstream through several double-channel fishway sections 4 and the turning rest area 5.

[0027] In summary, compared with other types of fishway structures, this invention has the following advantages: its systematic and compact layout greatly reduces the footprint, minimizing construction work while improving fish passage efficiency; the dual-channel design provides suitable upstream conditions for fish at different food chain levels and with different preferences; the rational use of intelligent identification and fish-driving equipment significantly improves the survival rate of fish within the fishway, effectively enhancing passage efficiency and fish passage performance, which is of great significance for promoting fish resource protection and ecological environment construction; this invention also fully considers construction costs and ecological environmental protection indicators, using a natural pebble matrix in the inner fishway pool floor paving, providing fish with natural-like conditions while greatly saving on fishway construction costs; furthermore, many structures in this invention can be further adjusted according to actual needs, greatly improving its practicality and scalability. This invention also provides a direction for research and technological innovation in related fields; and as an innovative structure, it has important reference value for protecting aquatic habitats, maintaining ecosystem stability, and protecting biodiversity.

[0028] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A dual-channel fish swarm tracing aid device, characterized in that: It includes a fish inlet (1), a fish collection pond (2), an intelligent fish identification and attraction system (3), and one or more dual-channel fish passage sections (4); the fish inlet (1) is connected to the fish collection pond (2), the intelligent fish identification and attraction system (3) is installed at the fish collection pond (2), the fish collection pond (2) is connected to the dual-channel fish passage section (4), and the dual-channel fish passage section (4) includes an outer fish passage chamber and an inner fish passage chamber.

2. The dual-channel fish swarm tracing aid device according to claim 1, characterized in that: If there are two or more double-channel fish passage sections (4), then the two adjacent double-channel fish passage sections (4) are connected by a turning rest area (5). After the connection, the outer fish passage pools of the two adjacent double-channel fish passage sections (4) are connected to each other, and the inner fish passage pools of the two adjacent double-channel fish passage sections (4) are connected to each other.

3. The dual-channel fish swarm tracing device according to claim 1, characterized in that: The fish inlet (1) includes a flow guide wall (11), a bottom plate (12) and several semi-cylindrical turbulence piles (13) spaced apart. The semi-cylindrical turbulence piles (13) are located on the bottom plate (12) and the cylindrical surface of the semi-cylindrical turbulence piles (13) faces the fish collection pond (2).

4. The dual-channel fish swarm tracing aid device according to claim 1, characterized in that: The fish collection pond (2) includes a bottom plate (24) and a first side wall (21), a second side wall (22), and a third side wall (23) fixed thereon. The intelligent fish attraction system (3) includes a bubble curtain air outlet (25), a high-speed camera (27), an infrasound fish attractor (26), a bubble curtain air supply pipe (32), and an intelligent fish attraction control room (31). The first side wall (21) of the fish pond is far away from the fish inlet (1). The third side wall (23) of the fish collection pond is set opposite to the first side wall (21) of the fish pond. The second side wall (22) of the fish collection pond is located between the first side wall (21) and the third side wall (23) of the fish pond and is directly opposite the double-channel fish passage section (4). The infrasonic fish attractor (26) is located on the first side wall (21) of the fish collection pond. The high-speed camera (27) is located on the second side wall (22) of the fish collection pond and is on the same vertical plane as the bubble curtain air outlet (25). The bubble curtain air outlet (25) is on the same plane as the middle side wall of the double-channel fish passage section (4). The bubble curtain air outlet (25) is installed on the bottom plate (24) of the fish collection pond and is connected to the bubble curtain air supply pipe (32). The air output of the bubble curtain air outlet (25) is controlled by the control system of the intelligent fish attraction control room (31). The high-speed camera (26) is connected to the intelligent fish attraction control room (31).

5. A dual-channel fish swarm tracing aid device according to claim 1, characterized in that: The dual-channel fishway section (4) includes an outer sidewall (41), an inner sidewall (42), a middle sidewall (43), an outer sloping bottom plate (44), an inner stepped bottom plate (45), a double vertical slit fishway partition (46), a "U"-shaped baffle (47), a porous basalt partition wall (48), and a simulated natural pebble matrix (49); the outer sidewall (41), the middle sidewall (43), and the outer sloping bottom plate (44) combine to form the outer fishway pool chamber; the middle sidewall (43), the inner sidewall (42), and the inner stepped bottom plate (49) combine to form the outer fishway pool chamber. The plates (45) are combined to form the inner fish passage chamber; multiple double vertical seam fish passage partitions (46) are arranged at intervals on the outer sloping bottom plate (44); "U" shaped baffles (47) are arranged on the inner stepped bottom plate (45), the inner stepped bottom plate (45) divides the inner fish passage chamber into multiple layers, the imitation natural pebble matrix (49) is laid on the inner stepped bottom plate (45) of each layer, and porous basalt partitions (48) are provided at intervals on the middle side wall (43), the porous basalt partitions (48) correspond to each inner fish passage chamber.

6. The dual-channel fish swarm tracing aid device according to claim 5, characterized in that: The inner stepped bottom plate (45) adopts a variable slope design, with the slope of each layer between 3% and 7% and increasing gradually along the direction of water flow; each inner stepped bottom plate (45) is connected by steps of 0.1m to 0.5m, and the outer sloping bottom plate (44) adopts a slope of 8% to 15% relative to the horizontal plane, with the height of the side closer to the fish collection pond (2) being lower than the height of the other side.

7. A dual-channel fish swarm tracing aid device according to claim 5, characterized in that: The double vertical slit fishway partition (46) includes several staggered rectangular baffles (53) and baffles with hook-shaped structures. Rectangular baffles (53) are arranged opposite each other on the outer sidewalls (41) and middle sidewalls (43) on both sides of the outer fishway pool chamber. The back of the baffle with hook-shaped structure corresponds exactly to the outlet between the two rectangular baffles (53). A gap is left between the baffle with hook-shaped structure and the outlet to form a double vertical slit. Multiple rows and three columns of "U"-shaped baffles (47) are provided on the inner stepped bottom plate (45) of each inner fishway pool chamber. The arc-shaped surface of the "U"-shaped baffle (47) faces the direction of water flow.

8. A dual-channel fish swarm tracing aid device according to claim 2, characterized in that: The turning rest area (5) includes an outer side wall (51), an inner side wall (52), a rectangular baffle (53), an outer bottom plate (54), an inner bottom plate (55), and a natural pebble matrix (56). The outer side wall (51) and the inner side wall (52) of the rest area form an outer fish passage pool room connecting area of ​​two adjacent double-channel fish passage sections (4). The inner side of the inner side wall (52) of the rest area forms an inner fish passage pool room connecting area of ​​two adjacent double-channel fish passage sections (4). Rectangular baffles (53) are arranged at intervals on the inner side of the outer side wall (51) and the inner side wall (52) of the rest area. The natural pebble matrix (56) of the rest area is laid on the inner bottom plate (55) of the rest area.

9. A dual-channel fish swarm tracing aid device according to claim 4, characterized in that: The intelligent fish-attracting control room (31) is equipped with an intelligent AI recognition system. The high-speed camera (27) is connected to the intelligent AI recognition system. The high-speed camera (27) has a resolution of 4K or higher and a frame rate of 60fps or higher.

10. A dual-channel fish swarm tracing method, characterized in that: Includes the following steps: Step 1: Fish in the river enter the fish collection pond (2) through the fish inlet (1). The high-speed camera (27) transmits the underwater fish images to the intelligent AI recognition system in the intelligent fish attraction control room (31) in real time. Step 2: The infrasonic fish attractor (26) continuously emits directional frequencies to attract juvenile fish and mid-bottom-dwelling fish, attracting the target fish to enter the inner fish passage chamber. Step 3: When the intelligent AI recognition system detects that a large predatory fish is approaching the fish collection pond (2) through the real-time image provided by the high-speed camera (27), the bubble curtain controller in the intelligent fish attraction control room (31) will deliver gas through the bubble curtain air supply pipe (32) and release air through the bubble curtain air outlet (25) to form bubbles in the fish collection pond (2) to drive away the large predatory fish.

Images