299 results about "Fish ladder" patented technology

The invention relates to the technical field of fishways, in particular to a canal fishway structure, construction and design method.The canal fishway structure, construction and design method comprises the following steps that S1, a hub fishway database is established, the swimming capacity of target fishes passing through a fishway is evaluated, and the migration ecological characteristics of the fish passing objects are determined; s2, designing a fishway scheme, and determining a fishway structure preliminary design scheme; s3, designing a fishway engineering local section physical model, and performing a fishway engineering local section physical model test to obtain a pool chamber structure recommendation scheme located at the upstream of the eel way in the vertical seam type fishway; and S4, establishing a fishway overall model, and performing a fishway overall model test to determine a fishway overall structure scheme. According to the design method of the canal fishway, a theoretical basis is provided for arranging an eel fishway suitable for migration of eels and eriocheir hepuensis and a vertical seam type fishway suitable for migration of squaliobarbus curriculus and dace, and then migration channels are provided for the eels, the squaliobarbus curriculus, the sinilabeo, the river perches, the eriocheir hepuensis and the like.

The invention relates to the technical field of water conservancy project fish protection, in particular to a safe and efficient fish descending device and a descending operation method.The safe and efficient fish descending device comprises a descending tower, a descending fishway is arranged on the descending tower, and the descending tower communicates with an upstream river channel and a downstream river channel through a fish luring pond and a buffering fishway; an upstream dispatching area controlled by a gate is arranged on the upstream and used for attracting juvenile fishes and sending the juvenile fishes into a downstream fishway; the spiral descending fishway is arranged, the occupied area needed by a fish descending channel is greatly reduced, and the spiral descending fishway is suitable for various intermountain high dam environments lacking of construction of the descending channel; meanwhile, by arranging the buffer pool and the buffer fishway, the impact on the fishes during descending can be greatly relieved, and the survival rate of the fishes is increased; after the juvenile fishes are attracted into the fish luring pond through the fish luring mechanism, the juvenile fishes can be quickly conveyed to the downstream river channel through the downstream fishway by using the upstream and downstream water head difference as power, the downstream efficiency is high while the maintenance cost is kept low, and the device is suitable for wide application and popularization.

The invention relates to a novel weir flow bottom hole combined fishway with diversion piers and a vortex recognition method of the novel weir flow bottom hole combined fishway, and belongs to the field of hydraulic engineering and ecological engineering. On the basis of a traditional weir flow bottom hole combined fishway, a traditional thin-walled weir is bent in the horizontal direction by improving the form of the weir, then the length of the overflow front edge is increased, and a diversion pier is additionally arranged at an outlet of a bottom hole. The combination of the weir and the bottom hole can effectively change the proportion of overflow on the weir and overflow at the bottom hole, and can effectively improve the water flow state in the fishway pool chamber. Besides, on the basis of the idea that the vorticity is larger than deformation, the vorticity is further decomposed into a rotating part and a non-rotating part through an omega vortex recognition method, and then vortexes in the fishway are effectively recognized. Physical model tests and numerical simulation prove that the device can effectively improve the water flow environment in the fishway pool chamber, and can be popularized and applied to actual engineering.

The invention relates to the technical field of fishways, in particular to a fishway overall model test method which comprises the following steps: S1, establishing a fishway overall model design scheme based on a preliminary design scheme; s2, a fishway overall model is manufactured based on the fishway overall model design scheme, the fishway overall model is designed to be a normal model, the fishway overall model is designed according to a gravity similarity criterion, and geometric similarity, water flow motion similarity and dynamic similarity checking is conducted on the fishway overall model design scheme; and S3, performing a fishway overall model test on the basis of the fishway overall model, and optimizing the fishway overall arrangement structure scheme so as to obtain a final fishway overall structure scheme. According to the fishway overall model test method, the fishway overall arrangement structure scheme is optimized, so that the final fishway overall structure scheme is obtained, and a theoretical basis is provided for fishway overall optimization.

The invention provides an arrangement method of a steel fishway structure capable of automatically pulling and stretching along with water level changes. The arrangement method comprises the steps that the water level difference of an inlet and an outlet of a fishway is monitored in real time; the buoyancy driving assembly is triggered according to the water level difference to drive the steel fishway subsections to move along the rails; calculating the telescopic length based on the water level difference and the fishway base length to ensure that the gradient is within the design range; the track motor is controlled to adjust the cable-stayed angles and gaps of the fishway sections; the gradient error is corrected in real time through the tilt angle sensor; the distribution density and the opening-closing angle of the guide plates are dynamically adjusted according to the flow speed and the water depth, and vortex is inhibited; the water temperature change is monitored, the thermal deformation compensation amount is calculated, and deformation is absorbed through the elastic sealing assembly. The fish passing rate can be increased, the adaptability and stability of the structure are enhanced, and the device is suitable for complex hydrological environments.

The invention discloses a fishway inlet flow velocity adjusting system and method based on fish induction flow velocity, and relates to the technical field of data processing. Firstly, environment and fish information comprehensive data of a fishway subordinate area are collected and analyzed, then target flow velocity adjustment parameters of the fishway subordinate area are obtained through matching, first fishway inlet flow velocity adjustment is carried out, a fish migration rule can be better understood, and therefore a more accurate flow velocity adjustment strategy is achieved; then analyzing the fishway operation parameters of the fishway membership area after the first adjustment and performing the second adjustment, continuously optimizing the flow velocity adjustment parameters, improving the fish luring effect of the fishway, and finally collecting the environment and fish information comprehensive data of the fishway membership area after the second adjustment and the fishway operation parameters of the fishway membership area so as to improve the fish luring effect of the fishway. The environment change can be quickly responded, the fish safety passing rate is improved, and therefore the fish passing effect of the fishway affiliated area is improved.

The invention discloses a canal river aquatic ecology influence evaluation system construction method and device, computer equipment and a readable storage medium, and the method comprises the steps: determining river obstruction through comprehensively considering river connectivity and a hub fishway fish passing effect, and determining river fragmentation degree according to river curvature and river self-cleaning capability of a bent section; river water ecological loss is determined based on benthic organism loss and biological loss caused by suspended solids, river aquatic ecological change is determined according to river biogenic factor change and fish population distribution change, and finally an evaluation system is constructed by combining river obstruction, river breakage degree, river water ecological loss and river aquatic ecological change. According to the design, various factors are comprehensively and systematically considered, and the influence of canal construction on river aquatic ecology can be accurately evaluated.

The invention provides a hydraulic automatic fishway device, and relates to the technical field of hydraulic engineering, the hydraulic automatic fishway device comprises an arc fishway track, a multifunctional structure is rotatably mounted on the outer side of the arc fishway track, the multifunctional structure comprises a synchronous belt, a plurality of fish collecting plates are arranged on the surface of the synchronous belt, and each fish collecting plate is clamped with the synchronous belt; a fish collecting groove is formed in each fish collecting plate, a fish luring warm-color lamp strip is arranged in each fish collecting groove, through a multifunctional structure, when water flow impacts the water turbine from bottom to top, the water turbine rotates under the radial force of the water flow, so that radial force is generated on the fixing rod to rotate in the fixing frame, and meanwhile, the water flow impacts the water turbine through the water flow; the rotation of the fixing rod enables the driving bevel gear to rotate and to be engaged with the driven bevel gear, so that the driven bevel gear rotates, and then the rotating cross rod is controlled to drive the first gear to rotate and to be engaged with the inner tooth set, so that the synchronous belt can drive the fish collecting plate and the fish collecting groove to rotate, fish at the fishway inlet is brought to the upstream, and migration of the fish is helped.

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 relates to the technical field of fishways, in particular to a fishway local section model test method. The method comprises the following steps: S1, drawing up a preliminary design scheme of the vertical seam type fishway; s2, designing a fishway engineering local section physical model based on the preliminary design scheme; s3, carrying out a fishway local section model test, measuring and evaluating fishway parameters, and finding out standard exceeding fishway parameters and reasons for the standard exceeding of the fishway parameters; and S4, after the reasons in the S3 are improved, the steps S2 to S4 are repeated until all the fishway parameters meet the design requirements, and a pool chamber structure recommendation scheme is formed based on the fishway parameters. According to the fishway local section model test method, the fishway section model test is carried out, parameters exceeding the standard are found, then adjustment is carried out, a pool chamber structure recommendation scheme is formed, and a theoretical experiment basis is provided for enabling a pool chamber, located on the upper stream of an eel way, on a vertical seam type fishway to meet the migration requirements of eels and eriocheir hepuensis.

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 fishway inlet device comprises a fixed fishway, the inlet end of the fixed fishway is rotationally connected with a transition section fishway through a rotating shaft, a telescopic control device is installed on the upper portion of the other side of the transition section fishway, and the output end of the telescopic control device is connected with a telescopic mechanism. The other end of the telescopic mechanism is in sliding limiting fit with the mounting box, the lower portion of the telescopic mechanism is connected with a telescopic flexible fishway, one end of the flexible fishway is connected with the transition section fishway, the other end of the flexible fishway is connected with the mounting box, and the other end of the mounting box is connected with the inlet end fishway. According to the device, the length of the fishway can be adjusted according to the water level so that the fishway inlet can adapt to the water level, the fish luring effect can be enhanced through the fish luring device, and the fish migration situation can be monitored in real time.

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 invention belongs to the technical field of robots, and relates to a bionic robotic fish coupled with fish luring factors, which is characterized in that a fish head, a fish body, a tail fin and a dorsal fin form a robotic fish shell; the robot further comprises two discharge electrodes, a communication module, two obstacle avoidance sensors, a water pump, two RGB lamps, three joint steering engines, a propeller thruster, two loudspeakers, a balance weight adjusting bin, a control circuit board, a battery, a water bin and a high-pressure air bin. Three fish luring factors including sound, light and electricity are coupled to the robotic fish, the combination mode of the factors is reasonably regulated, controlled and optimized, the fishes are guided to gather, the fishway entrance is found, the recognition ability of the fishes to fish passing facilities is enhanced, and the use efficiency of the fishway is improved. The method helps the migration of the rare fish fingerlings, protects the reproduction of the rare fishes, maintains the stability of fish populations, is beneficial to the protection and restoration of the ecological environment of the fishes, and walks the way of ecological priority and green development on the basis of the development of water conservancy projects.

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 relates to the technical field of hydraulic engineering, and discloses a stepped fishway which comprises an overflow channel, flow guide plates and a water supplementing assembly, a plurality of groups of flow guide plates are arranged in the stepped overflow channel, a plurality of fishway grooves are formed by the adjacent flow guide plates and the overflow channel, and the fishway groove at the bottommost end is communicated with a downstream water body of a dam. When the flow of the river channel is in a normal range, water flows from the upstream to the downstream of the dam along the overflow channel, and flows into and fills the fishway groove; and the backtracking fishes jump from the fishway grooves in the low position to the fishway grooves in the high position step by step, and the backtracking process is completed. The water supplementing assembly is arranged, when the flow of the river channel is cut off or the flow is lower than the normal range, the water supplementing assembly starts related water supplementing work, the pump body is driven to pump downstream water of the dam, water is conveyed into the fishway grooves through the water inlet pipe, and after the water level of the fishway grooves is increased, backtracking fishes jump to the fishway grooves at the high position from the fishway grooves at the low position step by step; and the backtracking process is completed. The invention further provides a fishway water replenishing method.

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 bionic ecological fishway capable of adjusting water flow and having an induction function, and belongs to the technical field of ecological fishways, the bionic ecological fishway comprises a dam body, two fishway protection plates are fixed on the dam body, a fishway main body is arranged between the fishway protection plates, and a flow guide mechanism used for adjusting the water flow is mounted on the inner wall of each fishway protection plate. The gate mechanism and the flow guide mechanism are installed on the fishway body, the flow guide mechanism comprises an adjusting rod, the induction mechanism comprises a feeding box, the top of the adjusting rod can drive the feeding box to rotate, and a pulse type fish blocking electric grid is installed at the position of an inlet plate, the water flow in the fishway body can be flexibly adjusted through the gate mechanism and the flow guide mechanism so as to meet the migration requirements of different fishes; through close cooperation of the flow guide mechanism and the induction mechanism, angle adjustment of the feeding box is facilitated, fish schools can be attracted into the fishway in a larger range conveniently, the impulse type fish blocking electric grid effectively blocks the fish schools, it is guaranteed that the fish schools enter the fishway according to a preset path, and the use efficiency of the fishway is improved.

The utility model designs a vertical seam type fishway and a dam, and relates to the technical field of fishways, on one hand, the vertical seam type fishway comprises an overflow channel, the overflow channel comprises a bottom plate and two side plates which are obliquely arranged, and a forward buffering device and a reverse counteracting device are arranged in the overflow channel; the forward buffering device comprises a short partition plate arranged on one side plate, a long partition plate arranged on the other side plate and a slow flow opening, one end of the short partition plate is obliquely upwards arranged towards the top of the overflow channel, one end of the long partition plate is obliquely upwards arranged towards the top of the overflow channel, and the short partition plate and the long partition plate are arranged at intervals to form the slow flow opening; the reverse counteracting device comprises a plurality of jet flow pipes, a plurality of jet flow openings formed in the jet flow pipes and a water supply assembly used for supplying water into the jet flow pipes, each jet flow opening faces the top of the overflow channel, and the axial directions of the jet flow openings in the different jet flow pipes are consistent. On the other hand, the utility model discloses a dam which comprises a dam body, and the vertical seam type fishway is arranged on the dam body.

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.

The present invention relates to a fry counting device, comprising a fish supply device, a fishway and a counting box, wherein the fishway is tilted downward as a whole, a fill light is provided at the bottom, and a host is provided at the top, wherein the host comprises a camera arranged at the bottom for photographing the internal position of the counting box, a development board arranged at the inside, and a display screen arranged at the top, and is characterized in that the fish supply device can be a pump suction type, a siphon type or a pneumatic type, and the fishway comprises an initial step channel, a middle step channel, and a final step channel connected in sequence, and the angle between the fishway and the horizontal plane decreases step by step. The stepped channel is used to gradually ease the water flow, so that the fry can be evenly distributed at the shooting position, and through different modifications of the fish supply device, it plays a role in preventing the fry from being injured, reducing human operation, and speeding up the fry counting process on the basis of ensuring the counting accuracy.

The invention discloses a very simple fish passing system, and belongs to the technical field of water conservancy and hydropower engineering. Comprising a fish luring and collecting mechanism, a lifting mechanism is arranged on the fish luring and collecting mechanism, and a transfer control mechanism is arranged on the lifting mechanism; the fish luring and collecting mechanism comprises a fishway, a fish screen arranged on the downstream side of the fishway, water retaining doors arranged at the head end and the tail end of the fishway, a flow monitoring device arranged at a downstream inlet of the fishway, a flow speed control gate arranged on the upstream of the flow monitoring device, and a reducing cage arranged on the upstream of the flow speed control gate. The fish quantity monitoring device is arranged at the upstream of the reducing cage, the lower fish blocking net and the upper fish blocking net are arranged at the upstream of the fish quantity monitoring device, the trash rack is arranged at the upstream of the upper fish blocking net, and a fish collecting space is formed between the lower fish blocking net and the upper fish blocking net; the overhauling operation bent frame and the manual opening and closing device are arranged on the upper portion of the fishway. The whole structure is simple, necessary fish luring, collecting and transporting facilities are complete, and the requirement for small-scale fish passing tasks can be met.

The invention discloses a fish passing structure suitable for an upstream variable water level, belongs to the technical field of fishway structures, and can solve the problem that an existing pool weir type fishway cannot adapt to upstream reservoir water level changes. The fish passing structure comprises a vertical seam type fishway; the regulating reservoir is connected to the downstream end of the vertical seam type fishway; the bottom plate elevation of the adjusting tank is the same as the bottom elevation of the downstream end of the vertical seam type fishway; an overflow port is formed in the side wall of the adjusting tank; a protective fishing net is mounted on the overflow port; the pond weir type fishway is connected to the downstream end of the adjusting pond; the bottom elevation of the upstream end of the pool weir type fishway is higher than that of a bottom plate of the adjusting pool; the bottom elevation of the overflow port is higher than the top elevation of a weir plate in the pool weir type fishway; the water discarding channel is connected to the outer side of the side wall, provided with the overflow port, of the adjusting tank, and water higher than the bottom elevation of the overflow port in the adjusting tank is discharged through the water discarding channel. The invention is used for the pool weir type fishway.

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.