182 results about "Fish ladder" patented technology

The present invention discloses a double-layer overpass fishway structure, belonging to the field of fishway design in water conservancy projects. The double-layer overpass design enables an upper overflow and a lower submerged flow. The water flow structure within the pool chamber is diverse and can adapt to different water depths, creating favorable hydraulic conditions for fish with different preferences. The double-layer overpass fishway comprises: a trumpet-shaped inlet section, a hump-shaped weir transition section, a double-layer overpass pool section (including a lower disc-shaped channel section and an upper overflow section), and a resting pool section. The hump weir section divides the pool chamber into an upper overflow area and a lower submerged outflow area. The formation of the upper overflow area draws jumping fish into the upper overflow weir section, while the lower submerged flow area is used to attract bottom-dwelling fish and allow them to smoothly swim upstream through the disc-shaped channel section. The arrangement of the resting pool section creates a low-flow zone to allow fish to recover their strength, thereby allowing them to successfully complete their upstream migration and ensure the stability of the river ecosystem.

The invention relates to the field of hydraulic engineering facilities, in particular to a fishway (1), a sluice and a fishway arrangement method.The fishway comprises a plurality of turn-back sections (11) which are connected in sequence and at least partially arranged on a ramp section of a stilling pool (3) at the downstream of the sluice, and the gradient of each turn-back section is smaller than that of the ramp section of the stilling pool; the bottom end of the fish migration channel is provided with a fishway inlet (13), and the top end of the fish migration channel is provided with a fishway outlet (14) communicated with the lock chamber of the water gate. And the fishes at the downstream are attracted by the water flow which flows out of the fishway and is suitable for migration, so that the fishes enter the fishway and upstream to enter the lock chamber at the upstream of the stilling pool. Due to the fact that the fishway extends into the gate chamber of the water gate in a turning-back mode, the height difference of the stilling pool is relieved in a segmented climbing mode, the water flow speed in the fishway is lower, and therefore the fishway is suitable for fish migration, and fishes can pass through the stilling pool and the water gate through the fishway.

The invention provides a fishway efficiency evaluation and diagnosis method and system based on AI ecological monitoring and a medium, and the method comprises the steps: firstly, collecting images, three-dimensional point clouds, water quality parameters and water flow data inside and outside a fishway in real time through the deployment of an underwater camera, a sonar, a water quality sensor and hydrological monitoring equipment, and forming multi-source heterogeneous data; secondly, through data cleaning and preprocessing and a preset AI identification technology, automatically counting the passing quantity and types of fishes; then, multi-dimensional evaluation is conducted on the fishway based on the structure, water quality, hydrology and ecology, and then the fishway health index is analyzed based on expert weight distribution; and finally, performing evaluation and problem diagnosis on the fishway energy efficiency according to the fishway health index, and generating a maintenance suggestion. According to the method, a monitoring-evaluation-diagnosis-optimization closed-loop system is constructed, dynamic management and quick response of fishway efficiency are achieved, and scientific support is provided for hydraulic engineering and ecological sustainable development.

A Taiji fishway structure includes fishway pool chamber units arranged sequentially along a water flow direction, each fishway pool chamber unit includes an curved side wall, an curved deflector, and a first longitudinal side wall, a fishway vertical partition plate, and a second longitudinal side wall provided on the same side of the fishway. A head end of the curved deflector of the i-th fishway pool chamber unit connects to a head end of the curved side wall in the (i+1)th fishway pool chamber unit, and forms a fish passage vertical slot that matches target fish body size with an end of the fishway vertical partition plate in the (i+1)th fishway pool chamber unit, and water flow of the i-th fishway pool chamber unit is ejected toward the curved side wall in the (i+1)th fishway pool chamber unit through the fish passage vertical slot.

The invention discloses a partition plate type fishway built on a floodplain, and relates to the technical field of fishways, the partition plate type fishway comprises a fishway and a movable cover plate, the fishway is a partition plate vertical seam type fishway, the movable cover plate is arranged at an opening in the upper end of the fishway, and the movable cover plate is detachably connected with the fishway. According to the partition plate type fishway built on the floodplain, fish migration can be achieved for a floodplain type river channel, and silt can be prevented from blocking the fishway when river water overflows the floodplain.

The present invention relates to the technical field of fish reproduction and release facilities, and specifically to an ecologically simulated fish fry wilding training fishway and a wilding training method. A water reservoir, a water supply unit, a return water unit, a fishway body, and an inlet fishway; the water supply unit is used to supply water from the water body to the water reservoir; one end of the fishway body is connected to the water reservoir through a water discharge valve, and the other end of the fishway body is connected to the water body through an inlet fishway; a water retaining gate is provided on the inlet fishway; a first resting pool, a second resting pool, and a third resting pool are provided in the fishway body; a number of stone steps are provided on the fishway body; and at least two water retaining steps are also provided. In response to the technical problem of low survival rate of released fry, the present invention is more in line with the characteristics of the wild habitat of released fish, and can train the fry's ability to adapt to natural water bodies by adjusting the flow rate and flow rate in the fishway body, meet the needs of fish wilding training, and also meet the needs of zoned breeding in the fishway body at the same time.

The application discloses a fishway with a movable baffle and belongs to the field of fishway construction in water conservancy and hydropower engineering. The fishway comprises a fixed wing plate, a movable baffle, a pushing rod bearing, a pushing ball head, a hydraulic pushing rod, a pushing rod shaft, a fixed wide baffle and an energy dissipation baffle. The fishway can help fishes with different swimming abilities to pass through a dam and shorten the passing time.

The technical solution adopted in this invention is: a composite baffle-type fishway with adaptive water level variation, comprising: a flow channel with a consistent width and slope along its length; sidewalls respectively disposed on both sides of the flow channel; and several composite baffles installed within the flow channel, the composite baffles including a first baffle and a second baffle; the first baffle is located in front of the second baffle in the direction of water flow; wherein, the first baffle is composed of two trapezoidal symmetrical baffles fixedly connected to the sidewalls and the flow channel, forming a trapezoidal vertical slit flow structure that is narrow at the top and wide at the bottom; the second baffle is a composite structure that is U-shaped in plan and trapezoidal in elevation, narrow at the top and wide at the bottom, fixed at the centerline of the flow channel; there are gaps between the two sides of the second baffle and the sidewalls, forming an inverted trapezoidal vertical slit flow structure that is wide at the top and narrow at the bottom; this invention improves the fishway's ability to adapt to water level variation, forms a stable flow field conducive to fish swimming upstream, better protects fish, and reduces the obstructive impact of dams on watershed connectivity.

The invention discloses an intelligent riverway retaining dam system based on ecological function regulation and control in the technical field of water conservancy ecology. The intelligent riverway retaining dam system comprises a retaining dam body and a server. The side, close to the shoreside, of the retaining dam body is provided with multiple stages of water pools distributed in a stepped mode, every two adjacent stages of water pools are communicated through an inclined water channel, and the server comprises an acquisition module, a data processing module and an execution module; the acquisition module is used for acquiring feature images of migrated fishes and water flow velocity in a water channel; the data processing module is used for analyzing the fish feature image through a trained deep learning algorithm, so that the water flow speed is matched with the water flow speed of corresponding fish migration; and the execution module is used for opening, closing and adjusting a gate of the fishway according to the instruction of the data processing module. According to the scheme, the problems that the flow speed of water flow of an existing fishway is unstable, and fish migration is affected are solved.

The invention relates to the field of hydropower stations, in particular to a hydropower station reservoir area fishway outlet structure and a fishway fish passing method, the hydropower station reservoir area fishway outlet structure adapts to the scene with the large reservoir area water level change amplitude and is more compact in structure, the hydropower station reservoir area fishway outlet structure comprises a fishway section, a fish lifting machine and a gate, and the position of the upstream of the fishway section is higher than the position of the downstream of the fishway section; the gate and the fish lifting machine are arranged on the upstream of the fishway section and comprise a flat slope section, the flat slope section is arranged between the fishway section and the fish lifting machine, the bottom face of the flat slope section is horizontally arranged, an inlet of the flat slope section is communicated with the fishway section, and a water inlet gate is arranged at an outlet of the flat slope section. The system is particularly suitable for hydropower stations with large reservoir area water level variation amplitude and limited fishway arrangement space.

The invention belongs to the technical field of fishway engineering and hydraulic simulation and calculation, and relates to a method and system for calculating hydraulic parameters of a vertical seam type fishway influenced by downstream water level change, and the method comprises the steps: S1, obtaining fishway design parameters and initial hydraulic parameters; s2, when the downstream water level changes, calculating the changed flow velocity of the first vertical seam, the changed water level of the inlet, the changed water level of the first pool chamber and the changed water depth of the first pool chamber, and taking the first pool chamber as the current pool chamber; s3, calculating the changed flow velocity of the next adjacent vertical seam and the changed water level and water depth of the next adjacent pool chamber based on the changed water level and water depth of the current pool chamber; and S4, taking the next adjacent pool chamber in the S3 as the current pool chamber, returning to the S3, continuously calculating the changed flow velocity of the next adjacent vertical seam and the changed water level and water depth of the next adjacent pool chamber until the calculation is stopped, and determining the influenced vertical seam and pool chamber and the corresponding changed hydraulic parameters. According to the method, the number of the vertical seams, the pool chambers and the hydraulic parameter change condition influenced by the downstream water level change can be determined.

The invention discloses a fishway hydraulic power and fishway structure design method and related equipment, and the method comprises the steps: obtaining swimming capability parameters of each target fish species in a target water area, the swimming capability parameters comprising an induction flow rate, a critical swimming speed and an outbreak swimming speed; selecting the target fingerling with the minimum critical swimming speed as a limited fingerling; according to the critical swimming speed corresponding to the limited fingerling, calculating a first energy consumption rate of swimming of the limited fingerling at the first hydraulic flow speed; according to the first energy consumption rate, hydraulic function partitions and space sequence layout of the fishway are determined; and determining fishway hydraulic parameters according to the induction flow velocity of each target fingerling and the critical swimming speed and the outbreak swimming speed of the limited fingerling. According to the fishway, inclusive passing of the fishway to multiple species can be achieved, the structural design of the fishway can adapt to the natural behavior rhythm of fishes, the overall energy consumption of dam passing of fish schools is remarkably reduced, then the ecological efficiency of the fishway is improved, and the fishway can be widely applied to the technical field of fishway design.

This invention provides a method for fish passage behavior recognition based on a multimodal large model. First, imaging sonar image sequences and underwater optical video sequences of fish passing through fish passages or facilities are simultaneously acquired, and the multimodal data are aligned through time stamp synchronization and spatial calibration. Then, fish target detection, segmentation, and feature extraction are performed on the sonar image sequences and optical video sequences respectively to obtain the fish's spatial location, body length, water depth, motion state, morphological structure, and posture features. The obtained acoustic and optical features are input into a multimodal coding and fusion model based on the Transformer architecture, and a unified fish behavior representation vector is constructed through a cross-modal attention mechanism. During the training phase, model parameters are adjusted through a multi-task learning approach using cross-entropy loss, mean squared error loss, and contrastive learning loss, ultimately achieving fish passage behavior category recognition and prediction of individual and group passage difficulty scores.

The application discloses a non-constant flow water-saving type flipper step type fishway and a fish migration method. A plurality of flippers are arranged in the fishway body along the length direction of the fishway body. Each flipper transversely divides the fishway body, thereby forming a plurality of migration pools surrounded by two adjacent flippers. The elevation of the upper end of each flipper gradually decreases along the water flow direction. All the flippers can connect or disconnect the adjacent migration pools. The first flipper, the second flipper, the third flipper and the like are opened and closed in turn according to the set rhythm until the uppermost flipper. The fish enters the upper migration pool in the opening process of the flipper and migrates step by step, thereby realizing the fish flip. The application basically has no requirement on the swimming ability of the fish. The drop water formed in the opening process of the flipper has an attracting effect on the fish, is very beneficial to the fish migration, and the water flow for realizing the migration is smaller than that of the existing fishway.

The present application provides a kind of fish collection and fish luring system of fish passage, including fish blocking electric fence and fish passage;Fish passage is set in the downstream of dam and is close to the shore side, and the one end of fish passage is provided with water inlet, and the other end of fish passage is provided with water outlet, and water inlet is towards the water outlet of dam;Fish blocking electric fence is fixedly connected in the water outlet side away from the shore and extends along the direction away from water inlet, and fish blocking electric fence is used to form electric field below water surface.Combining fish blocking electric fence electric field drive, fish counter-current upstreaming habit and near-shore swimming law, fish group is accurately guided to enter fish passage, and fish luring effect is strengthened with fish luring lamp, to solve the problem of low efficiency of traditional passive phototaxis fish luring.Collaborate water level sensing device and lifting mechanism, can automatically adjust the height of electric fence according to real-time water level, to ensure that electrode stick is always in the main upstreaming water layer of fish, and electric field fully covers effective water layer, without manual intervention.

The present application belongs to the technical field of hydraulic engineering and environmental protection engineering facilities, and particularly relates to an ecological flow releasing facility with a fishway and a construction method thereof. The present application is directed to the reconstruction and expansion of hydraulic engineering with ecological requirements. The fishway and the ecological flow releasing system adopt a short tunnel around dam scheme, which has little influence on other buildings of the hub. Rock plug is used for water retaining, and the installation of the water retaining gate is completed before the flood season, thereby avoiding the risk of flood control during the construction period due to the increase of the retaining and releasing water buildings caused by the reconstruction and expansion. The overall layout of the fishway engineering and the ecological flow releasing facility is considered, the tunnel section adopts the layout of the fishway on the top and the ecological releasing pipe on the bottom, the tunnel section type is beneficial to the stability of the surrounding rock, the construction difficulty is small, and the excavation and support amount is small. The tunnel section adopts a sunlight fiber optic introduction system for lighting, which can make the fishway tunnel section more close to the natural conditions, and the adverse effects of the fishway tunnel section engineering on fish migration are minimized.

The invention relates to the technical field of water conservancy and hydropower ecological protection, in particular to a fishway with a traffic function and an operation method of the fishway. Each spliced fishway comprises a fixed fishway section and rotary fishway sections arranged at the upstream end and the downstream end of the fixed fishway section; connecting bridges are respectively arranged in the river channels on the upstream side and the downstream side of the dam body; a tempered glass plate is laid on the top of the rotary fishway section. When the rotary fishway section rotates to be in a butt joint state with the connecting bridge, the rotary fishway section and the connecting bridge are spliced together to form a bridge body. In a fish passing season, the rotary fishway sections are spliced at the two ends of the fixed fishway section to form a spliced fishway for executing a fish passing mode; and in a non-fish passing season or other time periods where fish passing is not needed, the rotating fishway section is rotated to be in a butt joint state with the connecting bridge, and the rotating fishway section and the connecting bridge are jointly spliced to form a bridge body for executing a traffic mode.

This invention relates to the field of data processing technology, specifically to a method for evaluating the effectiveness of fish passage in an eco-friendly fishway based on multi-factor analysis. The method involves acquiring multi-dimensional data, a multi-factor evaluation calculation model, and engineering parameters of each batch of fish swimming through a test section within each monitoring period. In each period, the theoretical environmental pressure rate is calculated using the model based on water temperature and flow velocity sequences. The total time consumed is compared with a preset baseline time to determine the energy consumption index. Effective swimming weights are determined by combining the deviation of the swimming trajectory time series and engineering parameters, reducing the weight of ineffective time consumption data in the backwater rest area. Multiple indicators from all batches of fish are integrated to determine long-term evaluation deviation indicators, and effective error periods are selected. An environmental parameter constraint space is constructed, and relevant data from each batch of fish within the effective error period are used for traversal optimization to eliminate data contamination in the rest area and improve the model's adaptability and predictive accuracy to different environments and fish states.

This invention belongs to the field of ecological restoration technology in water conservancy engineering, specifically involving a fishway inlet centralized layout and natural fish-guiding structure adapted to large-amplitude water levels. It includes a fishway inlet group centrally arranged along the bank slope of the tailrace channel of a power plant, a vertically slit-type fishway main body, and a water replenishment and control system. The inlet group comprises multiple independent inlets arranged along an elevation gradient. Elevation differences are offset by fishway sections with a reversible structure, ensuring all inlets are centrally located within a certain range in the core fish-gathering area. The water replenishment and control system's flow rate is inversely correlated with the real-time water depth and natural flow rate within the fishway. Combined with the natural flow field of the tailrace channel, a natural fish-guiding path without a cross-river electric guide is constructed. This invention solves the problems of dispersed inlets, ecological stress in fish-guiding methods, and disconnected water replenishment and control logic in traditional designs. It achieves precise matching between the inlets and the natural migration paths of fish, significantly improving fish passage efficiency.

The invention provides a fishway and dam integrated device integrating multi-depth entrances and exits and multi-direction water replenishing and fish luring and an operation method, and belongs to the technical field of fishways. The device comprises a gravity dam section, a stepped fishway integrated in the gravity dam section and a water replenishing pipeline pre-buried in a wall body of the gravity dam section; the upstream side and the downstream side of the gravity dam section are provided with multi-elevation entrances and exits and matched gates respectively, a fishway bottom plate and partition plates of the stepped fishway are distributed in a stepped mode, and the water supplementing pipeline is provided with multi-direction water supplementing sprayers around the fishway entrance. According to the operation method, through cooperative opening and closing of multi-depth inlets and outlets, multi-direction and multi-flow-speed fine regulation and control of water supplementing nozzles, stepped fishway energy dissipation and flow aiding and dam water retaining mode switching, fishway and dam structure function integration is achieved. Extra land acquisition and pouring are not needed, the engineering cost and construction difficulty are reduced, the method can adapt to dynamic changes of the water level of the reservoir, migration depth preferences of different fishes are considered, the fish luring and passing efficiency is improved, and the fish passing window period is prolonged.

The application discloses a long-distance vertical-seam type fishway structure and an operation method thereof and belongs to the technical field of water conservancy and hydropower ecological protection. The structure comprises a dam and a vertical-seam type fishway. A fish collecting box lifting conveyor is arranged in one fishway side wall of a straight line section of the vertical-seam type fishway. A fish collecting box conveying mechanism for conveying fish collecting boxes in a long partition plate of the straight line section of the vertical-seam type fishway to the fish collecting box lifting conveyor is arranged in the long partition plate and the one fishway side wall. A fish collecting box returning mechanism for returning empty fish collecting boxes falling from the fish collecting box lifting conveyor to the long partition plate is arranged in the long partition plate and the one fishway side wall. Fishes can be lifted from a downstream section of the vertical-seam type fishway to an upstream section of the vertical-seam type fishway. The fishes in a fishway pool chamber can reach a dam upstream reservoir without experiencing long-distance internal migration, and the fish passing effect and efficiency of the vertical-seam type fishway are improved.

The present invention relates to the field of fishway technology, and in particular to a method for the structure, construction, and design of a canal fishway, comprising the following steps: S1: establishing a fishway database at a hub, evaluating the swimming ability of target fish species passing through the fishway, and determining the migratory ecological characteristics of the target fish species; S2: designing a fishway scheme and determining a preliminary design scheme for the fishway structure; S3: designing a physical model of a local section of the fishway project, and conducting a physical model test of the local section of the fishway project to obtain a recommended scheme for the pool chamber structure located upstream of the eel channel in the vertical slot fishway; S4: establishing an overall model of the fishway, and conducting an overall model test of the fishway to determine the overall structural scheme of the fishway. The design method of a canal fishway in the present application provides a theoretical basis for setting up an eel channel suitable for the migration of eels and Hepu mitten crabs and a vertical slot fishway suitable for the migration of red-eyed trout and dace, thereby solving the problem of providing migration channels for eels, red-eyed trout, dace, river perch, Hepu mitten crabs, etc.

The invention relates to the technical field of fishways, in particular to a jungle pile abrupt slope fishway and a design method thereof. According to the method, fluid mechanics numerical simulation is carried out on the second design model, the distance between the longitudinal adjacent vortex piles capable of forming the continuous vortex street is obtained, the distance between the transverse adjacent vortex piles is determined according to the maximum swing amplitude of the target fish and the continuous vortex street, and therefore the most suitable jungle pile abrupt slope fishway can be designed according to the target fish. The continuous vortex street formed by the vortex piles not only can form boosting force for pushing the target fish to swim upwards on the two sides of the target fish, but also forms a fish passing channel with slow water flow on the lower layer of the jungle pile abrupt slope fishway under the combined action of the vortex piles and the bottom partition plate; under the dual influence, cyprinid fishes with relatively weak swimming ability can smoothly trace upwards through the jungle pile abrupt slope fishway.

This invention provides a vertically ascending, slotted fishway, relating to the field of fishway technology. It includes an inlet pool connected to an outlet pool via a vertically ascending channel. The inlet pool has several first inlets on its wall, and the outlet pool has several first outlets on its wall. The vertically ascending channel includes several main vertically ascending channels connected by ascending bends. The interior of each main channel is divided into several chambers by several first partitions, and these chambers are interconnected. The interior of each ascending bend is divided into rest areas and passageways by second partitions, and these rest areas and passageways are interconnected. This invention has low construction costs, good terrain adaptability, and can effectively maintain the stability and diversity of fish populations.

The invention discloses a fish luring device for a fishway entrance, comprising two wing walls fixedly arranged in a river channel for forming a fishway, fixed plates are provided at the fishway entrances of the two wing walls, a frame is fixed at one of the wing walls, a plurality of rotating columns are rotatably connected to the inner side of the frame, a front plate is provided on the outer side of the rotating column, an inner shaft is rotatably connected to the inner side of the rotating column, a pressure plate is fixed on both sides of the inner shaft, a plurality of groups of openings are provided on the inner side of the rotating column, a plurality of groups of sliding columns matching the openings are fixed on both sides of the pressure plate, and a second spring is sleeved on the outer side of the sliding column between the openings and the pressure plate, a first rack is slidably connected to the top of the frame, a tooth pattern that meshes with the first rack is provided on the outer top of the inner shaft, an extrusion cylinder is provided on the side of the fixed plate close to the frame, a first spring is provided inside the extrusion cylinder, the interior of the extrusion cylinder is connected to one end of a pipe, and one end of the first rack is slidably matched with the inner wall of the other end of the pipe through a piston; the invention provides a water flow rate in a stable range for the fishway entrance.

The present invention discloses an acoustic-optical induction vertical slot fishway fish attracting system based on automatic parameter optimization. The system comprises a vertical slot fishway and an acoustic-optical signal acquisition and control system. An acoustic-optical fish attracting assembly is installed at the bottom edge of each vertical slot channel of the vertical slot fishway. The acoustic-optical fish attracting assembly emits signals in the same direction, toward the downstream. A detector for fish identification and counting is provided at the entrance and exit of the vertical slot fishway. An acoustic-optical background collector is provided at the entrance of the vertical slot fishway. The acoustic-optical signal acquisition and control system traverses all parameter combinations within the optimization range based on the duration of a single group of experiments, optimizes the optimal operating parameters of the acoustic-optical fish attracting assembly based on the maximum fish passing success rate, and controls the acoustic-optical fish attracting assembly to operate stably and long-term under the optimal parameter conditions. The present invention leverages the advantages of the flow structure of traditional vertical slot fishways, utilizes sound fish attracting technology and the phototaxis of fish, and controls the acoustic-optical induction based on automatic parameter optimization, thereby improving the fish passing efficiency of the fishway.

The invention discloses a floating fishway outlet structure and method adaptive to reservoir area water level amplitude, the fishway outlet structure comprises a fishway outlet, an adjusting unit is arranged in the fishway outlet, a floating plate is hinged to the adjusting unit, the floating plate is arranged on the outer side of the outlet end of the fishway outlet, the adjusting unit is slidably connected with the fishway outlet, and the adjusting unit is connected with the fishway outlet. A telescopic rod is arranged at the bottom of the adjusting unit, and the bottom of the telescopic rod is connected with the fishway outlet. The first-stage variable-gradient area is arranged at the outlet section of the fishway, the gradient is gradually reduced in the downstream direction, the downstream is connected with the water level flat slope pool, the whole fishway gradient is smoothly transited to the downstream fixed design gradient from the variable-gradient area, and therefore on the premise that the fish passing hydraulic condition is met, the fish passing efficiency is improved. And the application range of a single fishway outlet to the reservoir area water level amplitude variation is expanded.

The application discloses a fish passing system and method of dynamic and static cooperation, and belongs to the technical field of ecological protection of water conservancy and hydropower. The system comprises a dam, a short fishway, a fish collecting and lifting mechanism and a water supplement assembly. The short fishway is arranged at the downstream of the dam, and the inlet of the short fishway extends into the water body of the downstream river channel of the dam. The fish collecting and lifting mechanism is arranged on a carrying mechanism and is connected with the outlet of the short fishway. One end of the water supplement assembly extends into the water body of the downstream river channel of the dam, and the other end extends to the outlet of the short fishway or into the fish collecting and lifting mechanism. The fish passing system can be used as a long-term fish passing facility during the operation period of the dam. Compared with the fish passing system in the prior art, only the short fishway needs to be constructed on site, the construction engineering quantity is small, the construction difficulty is low, and the fish passing system is basically not limited by the topography and geology of the dam.