221 results about "Fish ladder" patented technology

The invention discloses a fish pass facility and method with a fish ladder and a navigation lock combined, and relates to a facility and method for migratory fishes to move upstream through a barrage building. The fish pass facility comprises a fish luring ladder with the inlet end arranged in the downstream river channel of a dam, wherein the fish luring ladder is a slope type channel which is internally provided with a low weir, the slope type channel inclines in the upstream direction and extends in the direction of the lock chamber of the navigation lock as a whole, the outlet end of the fish luring ladder is connected with a fish collecting pond which is connected with a transfer pond through a connecting channel, branch water diversion pipes are arranged in the transfer pond, the transfer pond is partitioned by a transverse partition wall into a main transfer pond and an auxiliary transfer pond, a lower gate is arranged in the transverse partition wall, a water flowing channel is formed in the side wall of the lock chamber of the navigation lock and is communicated with the transfer pond and the lock chamber of the navigation lock, and an upper gate is installed on the water flowing channel. According to the fish pass facility and method with the fish ladder and the navigation lock combined, the fish ladder and the navigation lock are combined, the upper end of the fish ladder is arranged in the lock chamber of the navigation lock, the influences caused by the upstream and downstream water head are overcome through the navigation lock, and therefore migratory fish shoals can pass through the dam; the length of the project of the fish ladder can be obviously reduced, and therefore input cost is reduced.

The invention discloses a water complementing system for a fish-way entrance, which has good fish attracting effects. The water complementing system comprises a water complementing pool, wherein a water completing header tube is connected on the water complementing pool; at least one water complementing sub tube is connected on the water complementing header tube; a plurality of water complementing branch tubes are connected on the water complementing sub tube. The water complementing system adopts a sectional water complementing manner to simultaneously complement water for a plurality of positions of the fish-way entrance, so that water flow speed of the whole fish-way entrance is simultaneously changed without destroying the flow regime at the fish-way entrance, the flow regime at the fish-way entrance is kept to be stable to effectively attract fishes to enter the fish-way, thereby achieving good fish attracting effects; moreover, a plurality of water complementing branch tubes are adopted to complement water, and flow speed at the exit of each water complementing branch tube is not too large, so that large interferences cannot be caused to the flow speed of the fish-way, the tracing of fishes is not affected and is not blocked. The water complementing system is suitable for popularization and application in the fish-way field.

The present invention relates to an automatic variable fishway. More particularly, an automatic variable fishway by water level sensed of the invention can automatically vary its height to uniformly maintain the quantity of water drained through the fishway so that migratory animals can freely move through the fishway to upstream or downstream of a dam regardless of the quantity of storage water. The automatic variable fishway by water level sensed of the invention is installed in a bank for storing a predetermined quantity of water to allow migration of fish, and comprises: an underwater gate 170 for being erected or laid by a drive means which is operative in response to a signal from a water level detecting sensor 50 for detecting the level of storage water; and a fishway plate 110 connected with a top of the underwater gate 170 to form a migration path for fish.

The invention discloses a device making use of fish phototaxis to improve fish passing effects of fishways. The device comprises a main control computer and at least one stage light guide lock chamber. Each stage light guide lock chamber comprises a fishway, an inlet fish collection lamp and an outlet fish collection lamp, wherein the inlet fish collection lamp and the outlet fish collection lamp are sequentially arranged on the cross section of the fishway, and the distance between the inlet fish collection lamp and the outlet fish collection lamp is less than the irradiation distance of the outlet fish collection lamp. When the light guide lock chamber is multi-stage, an outlet fish collection lamp of the upper stage lock chamber serves as an inlet fish collection lamp of the adjacent lower stage lock chamber. The main control computer is connected with the inlet fish collection lamp and the outlet fish collection lamp and controls opening and closing of the inlet fish collection lamp and the outlet fish collection lamp. At the same time, the invention further provides a method making use of fish phototaxis to improve fish passing effects of fishways. According to the device and the method, irradiation ranges of the fish collection lamps are indirectly expanded, the fish collection lamps can be applied to water areas with different depths, the variety of passing fishes and the number of passing fishes are increased, and universality of the fishways is enhanced.

An improved fish passage apparatus is combined with hydroelectric power generation to facilitate migration of fish between water bodies of different heights with minimal injury or trauma to fish. It may also be optimized for power generation when fish are not moving through it. The fish passage apparatus comprises a connecting tube providing fluid communication between upper and lower water bodies, an upper valve in the connecting tube adapted to control flow of water to or from an upper water body, a lower valve in the connecting tube adapted to control flow of water to or from a lower water body, and a working tube opening into the connecting tube between the upper and lower valves a working portion of which extends functionally vertical to above a water level of the upper body of water and to below a water level of the lower body and is vented at its top such that water can flow freely in and out of the working portion.

PCT No. PCT / EP97 / 02850 Sec. 371 Date Jun. 14, 1999 Sec. 102(e) Date Jun. 14, 1999 PCT Filed Jun. 2, 1997 PCT Pub. No. WO97 / 46761 PCT Pub. Date Dec. 11, 1997The invention relates to a fish ladder (1) to by-pass a vertical descent (SH) in a flowing watercourse (31F) or a dam (31T), with an upstream water inlet (2) and a downstream water outlet (3) and with basins (4) arranged between them substantially in the downstream direction, each of which has an inflow slot (5Z) and an outflow slot (5A) as vertical through-flow slots (5) and deviating apparatus (6, 13) to form a meandering passage. The basins (4) have a partially cylindrical inner wall (40). Successive basins (4a, 4b, 4c, 4d) are arranged against one another and mutually laterally offset in such a way that the through-flow slots (5) run transversely to the direction of slope (G). The through-flow slots (5) are bounded on both sides by a first vertical partially cylindrical pipe (60) over the entire height (H) of the basin as a first diversion (6) with a substantially smaller radius in relation to that of the inner wall (40) of the basin.

An improved fish deterrent and guide, utilizing generally a paddlewheel (1) consisting of a central shaft (10) with vanes (12) to create a behavioral modifier. When paddlewheel (1) is rotated, the action of the vanes striking the water creates water particle motion (low frequency sound or infrasound), turbulence and current, as well as visual cues that fish avoid. The device is tunable for different fish species and life stages by adjustment of vane style, spacing, and paddlewheel rotation speed. The use of multiple behavioral deterrents creates a measure of reliability in the system. Another advantage is that this fish deterrent provides a continuous lead, which is more effective than typical point-source turbulence and sound generators. Typically, the paddlewheel fish deterrent and guide is positioned at the water surface across the intake to a power plant intake to deter surface oriented downstream migrating fish, and guide them to a bypass. In this configuration floating debris is also guided through the bypass. Alternatively, the paddlewheel may be positioned at a subsurface elevation to guide non surface oriented fish to the bypass, or positioned across the tailrace to guide upstream migrating fish to a fishway entrance.

The invention discloses a device making use of fish phototaxis to improve fish passing effects of fishways. The device comprises a main control computer and at least one stage light guide lock chamber. Each stage light guide lock chamber comprises a fishway, an inlet fish collection lamp and an outlet fish collection lamp, wherein the inlet fish collection lamp and the outlet fish collection lamp are sequentially arranged on the cross section of the fishway, and the distance between the inlet fish collection lamp and the outlet fish collection lamp is less than the irradiation distance of the outlet fish collection lamp. When the light guide lock chamber is multi-stage, an outlet fish collection lamp of the upper stage lock chamber serves as an inlet fish collection lamp of the adjacent lower stage lock chamber. The main control computer is connected with the inlet fish collection lamp and the outlet fish collection lamp and controls opening and closing of the inlet fish collection lamp and the outlet fish collection lamp. At the same time, the invention further provides a method making use of fish phototaxis to improve fish passing effects of fishways. According to the device and the method, irradiation ranges of the fish collection lamps are indirectly expanded, the fish collection lamps can be applied to water areas with different depths, the variety of passing fishes and the number of passing fishes are increased, and universality of the fishways is enhanced.

The invention discloses a multi-stage superimposed arc type fish passage and a fish passing method and belongs to the field of ecological environment of fish passing buildings and hydraulic and hydroelectric engineering. The multi-stage superimposed arc type fish passage comprises a plurality of stages of fish passage units, a fish passage two-wing wall and a control system, wherein bottom plates and gates of the fish passage units are arc-shaped panels to form a superimposed arc type structure; foldable plates in the fish passage units can tend to be straight along the opening process of the gates and can cooperate with the gates to form water flow condition beneficial for upstream movement of the fishes. Compared with the conventional fish passage, the length of the fish passage can be reduced; the water flow condition of the fish passage can be adjusted; the fish passage is high in intelligent level, is applied to fish passing of dams with different water heads, is also applied to fishes with different swimming capabilities, and is capable of effectively protecting fish resources and maintaining the diversity of river ecosystems.

The invention provides a flow-line variable-cross-section back-flushing energy dissipation fishway with a fish luring function. The flow-line variable-cross-section back-flushing energy dissipation fishway comprises bottom plates, back-flushing water outlets, a base, flow-line-type combination side walls, back-flushing waterways, a lower chamber, an underwater water outlet; the flow-line-type combination side walls are uniformly arranged along the whole fishway; the back-flushing waterways are formed in the bottom plates and are located at downstream parts which are 60 cm away from narrowest parts of the fishways defined by the left and right flow-line-type combination side walls; the lower chamber is arranged below the bottom plates; the underwater water outlet is formed in a bottom partof a tail end of the lower chamber; and each back-flushing waterway is of a curve-surface structure of which the lower part is large and the upper part is small. The flow-line variable-cross-section back-flushing energy dissipation fishway has the beneficial effects that flowing speed and flow of bottom-layer water flows of the water outlets of the fishway are increased through bottom-layer high-pressure water flows, and a fish luring effect of the water outlets in the fishway is improved; back-flushing water flows and flow-line-type fishway side walls are designed, so that water flow energy in the fishway is dissipated; the flowing state and flowing speed of water flows in the fishway are improved; and a fish passing rate of the fishway is improved.

The invention relates to a fishway inlet system and design method for inducing grass carp and a device for determining the flow rate of fish, comprising: a fishway and its fishway inlet arranged along the river flow direction, and one side of the fishway and the fishway inlet is close to each other On one bank of the river, the other side is provided with a fish-lure water flow channel and a fish-lure water flow channel outlet in the same direction as the fishway and the fishway inlet. The present invention only needs to set up one water flow for luring fish, and the water flow condition for luring fish can be created by coordinating the water flow for luring fish with the water flow for fishway. There are only two water flow parameters that need to be calibrated: the optimal flow velocity at the fishway inlet and the optimal flow velocity ratio between the outlet flow velocity of the fish-lure water flow channel and the fishway inlet flow velocity. Compared with other water flow fish luring methods, two water flow parameter values ​​are clearly given. The water flow form of the fishway inlet is simple and the engineering quantity is small, not only can be directly used in the hydraulic design of the grass carp fishway inlet, but also can be easily extended to the fishway inlet water flow design of other fish species.

The invention relates to a tidal river reach fishway inlet design method and a fishway inlet. The method comprises the steps of: typical tide process selection; tide level calculation; fishway inlet section hydraulic characteristic calculation; fishway inlet arrangement and water level design; and fishway inlet parameter determination. The method builds a flux and reflux model of a tidal river reach by tide current principles and tidal river reach hydraulic characteristics, calculates various types of tidal ranges and the tide level change conditions through the model, calculates and determines optimal fishway inlet positions of various tide levels to adapt to the flows, the flowing directions and the water level changes of different tide currents through the fishway inlet section hydraulic characteristics, improves the fishway fish passing efficiency, reduces the influence on fish stop by the hydraulic engineering construction, and achieves important significance on protection or repair of the river ecological environment.

A safe fish guide path structure includes a horizontal tube having an intake and exhaust valve for controlling levels of air having lower viscosity than water. The horizontal tube is equipped with a transparent window at both sides about the intake and exhaust valve. The horizontal tube is installed at a weir or a bank. An inclined tube extends horizontally from both sides of the horizontal tube. An extended tube extends horizontally from an end portion of the inclined tube. An inlet tube extends from an end portion of the extended tube toward an upper side, while communicating with the extended tube, with water flowing through the inlet tube. A cover has an insertion groove at one side into which the extended tube is inserted, and a cut-away groove at the other side for water to flow through the cutaway groove.

The invention discloses a fishway which is used for ecological restoration engineering, especially for water conservancy and hydropower engineering. The fishway provided by the invention not only can provide a quiet rest place for fish migrating through the water conservancy and hydropower engineering, but also cannot increase the integral length of the fishway. The fishway comprises a side wall and a partition plate structure, wherein the partition plate structure is arranged on the side wall for dividing the fishway into a plurality of swimming pools; the swimming pools are communicated with each other; the fishway further comprises a rest pool which is arranged between two swimming pools, wherein the rest pool and the swimming pools are separated by the partition plate structure and are communicated with each other; and the rest pool is wider than the swimming pools. Since the rest pool is wider than the swimming pools, so the part, projected out of the swimming pools, of the rest pool is not directly affected by water flow in the fishway, and the water flow in the projected part is clam, so as to be suitable for the fish to rest during breeding migration; moreover, only the rest pool is widened, so that the integral length of the fishway is not increased.

The invention provides a fish passing system and method free of water resource losses and free water surfaces. The fish passing system is composed of a dam, a fish outlet tunnel, a fish inlet tunnel, a fish collection chamber, a fish outlet gate, a fish inlet gate, a downstream river channel, a sound making unit, a light-emitting unit, a power supply, a material injection machine, a material injection pipe, a fish exploration radar and a master control system. Compared with an existing fish way design method, the fish passing system has the remarkable differences that because the fish passing system is provided with fish passing tunnels and the fish collection chamber which have pressure and are free of free water surfaces, fish way establishment and maintenance expenses are remarkably reduced, project construction lands are greatly saved, almost no water resources are consumed by fish passing, and the fish passing efficiency is improved. A designed fish way can be used for temporary food discharge as well.

The invention discloses a system for observing and collecting migratory fishes in a fish way. The system comprises an observing system and a collecting system, the observing system is arranged beside or in a fish way body, and the collecting system is arranged beside the observing system. The system overcomes the defect that an observing chamber directly arranged on the side wall of the fish way is only supportive of observing and counting and cannot collect fishes or is small in collection quantity and low in efficiency and the defect of influence on normal fish passing of the fish way due to proneness to fish death caused by the fact that several times of fishing are needed for complete counting in the prior art. The system has observing, monitoring, counting and sampling functions, and is free of influence on normal running of the fish way, high in fish collecting efficiency, little in damage to fishes and free of influence on fish resources and supportive of cleaning and maintaining a glass window of the observing chamber by opening and closing different gates to adjust flowing direction of water. The invention further discloses a method for observing and collecting the migratory fishes in the fish way.

The invention relates to the field of water conservancy project, in particular to a fish passageway and a fish passageway building method of a low-waterhead dam. A submersible hole connecting a high water level side and a low water level side of the dam is formed in a bottom sill of a flood discharge gate, which is close to a power plant, and is used as an outlet of the fish passageway; and a fish passageway body communicated with the submersible hole is built on one side of the flood discharge gate of a spacing wall between the downstream of the power plant and the downstream of the flood discharge gate. By the method, the fish passageway favorable for upstream running is built by ingeniously using the structure of the dam; the submersible hole formed in the bottom sill of the flood discharging gate is used as the outlet of the fish passageway, so that the overall structure of the dam cannot be damaged, and the running safety of the dam is not influenced; and the fish passageway body communicated with the submersible hole is built on one side of the flood discharge gate of the spacing wall between the downstream of the power plant and the downstream of the flood discharge gate, so that construction difficulty is reduced and cost is saved.

The invention provides an experimental system and method for quantifying a preference hydraulic factor interval of fish. The experiment system comprises a water groove device and a data analysis system, wherein the water groove device comprises a water groove, a water inlet box and a tail water box which are arranged at two ends of the water groove and communicate with the water groove, and a rectification grid, a turbulence perturbator, a blocking net, a separation net, a tail door and a water circulation system which are arranged in the water groove; and the data analysis system comprises aCCD camera, a telescopic T-shaped support, a video recorder and a data processor. According to the invention, on the basis of an open water groove, a constant turbulence field is generated through theturbulence perturbator, and the preference hydraulic factor interval range of target experimental fish is obtained by analysis according to the real-time recorded upstream movement track change of the fish. The experimental system provided by the invention is reasonable in design and reliable in data for determining the preference hydraulic factor interval range of the fish, can provide help forconstruction of the hydrodynamic environment of a fish habitat and design and optimization of fishway hydraulic parameters; meanwhile, the water groove is convenient to be disassembled, assembled andtransported, and facilitates indoor experiments and field experiments.

The invention discloses an ecological landscape barrage and a construction method thereof. The ecological landscape barrage comprises a barrage and various stages of hydraulic drops, wherein the barrage is a water-retaining building, the zigzag multi-stage tandem hydraulic drops are arranged at the downstream part of the barrage and next to the barrage, so that a multi-stage artificial waterfall with fall change is formed, hydraulic drop ponds are arranged between the barrage and the first-stage hydraulic drop, and between each two stages of the hydraulic drops separately, and used for energydissipation, and meanwhile, a fish way is arranged or a fish ladder is directly formed as a biological migration channel by virtue of the multi-stage tandem hydraulic drops; each stage of the hydraulic drop pond doubles as a landscape pool; and in addition, with regard to the barrage without overflow in dry seasons, ecological flow drainage holes are formed in the middle part of the barrage, and double as fish passing holes. According to the ecological landscape barrage and the construction method thereof, the problems of passing-over of fishes and other migratory organisms, and local cutoff of the downstream part of the barrage, are solved; protection for the biological diversity of a river is benefited; and the plane landscape effect, the elevation landscape effect and the overall landscape stratification of the barrage are improved, so that the barrage has the functions of being convenient for people and hydrophilic, and has good social and economic comprehensive benefits.

The invention relates to the technical field of fish passing facilities of gates and dams of key water conservancy and hydropower control projects, in particular to a communicating type still water fish way. The communicating type still water fish way comprises an upstream outlet section, an upstream and downstream water body communicating section, a migration fish school waiting section and a downstream inlet section, wherein the upstream outlet section, the upstream and downstream water body communicating section, the migration fish school waiting section and the downstream inlet section are sequentially connected from the upstream side to the downstream side. An upstream outlet section bulkhead gate is arranged between the upstream outlet section and the upstream and downstream water body communicating section. A waiting section service gate is arranged between the upstream and downstream water body communicating section and the migration fish school waiting section. A downstream inlet section service gate is arranged between the migration fish school waiting section and the downstream inlet section. According to the communicating type still water fish way, the fish way is divided into multiple different functional sections, management is convenient, and the fish passing efficiency is high; the fish way is simple in design, flexible in arrangement, convenient and rapid to construct, low in manufacturing cost and good in application prospect, and especially for a built project without a fish way, the communicating type still water fish way can be conveniently arranged.

A fishladder (10) for use along a waterway includes a channel having a bottom wall (16), a pair of opposing, up-wardly extending sidewalls (18a, b) and opposing open ends. A series of projections (20) are disposed along the channel between the opposing walls (18a, b), and a series of baffles (22) are also disposed along the channel adjacent the series of projections. The baffles (22) define a sheltered side (28), having sheltered areas with a low water flow rate in which fish can rest, and a flow side capable of carrying water having a higher water flow rate and along which fish can advance up the fish ladder. A passage (30) extends through the battles, which allows water to flow through the sheltered areas at a rate capable of preventing the build-up of sediment in the same sheltered areas, but which does not significantly impede the ability of fish to rest in these areas.

The invention discloses an intelligent fish monitoring method based on a video image, and the method comprises the steps of obtaining a fish passing video, carrying out the frame extraction processing, carrying out the noise reduction processing, and inputting the processed video into a trained Faster-RCNN for recognition; judging the central position distance between fishes of the same type in two adjacent frame images so as to determine whether one fish is located on the adjacent frame image or not; and when the same fish is located on the two adjacent frame images, determining the change ofthe number of each type of fish in the fishway based on the relationship between the central position and the reference line of the same fish on the two adjacent frame images and the change amount ofthe central position. According to the scheme, accurate counting of the number of each type of fish can be realized through the mode.

The invention provides a multifunctional ship lock combined with a fishway, and an operation method thereof, and belongs to the technical field of hydraulic engineering equipment and machinery. The multifunctional ship lock comprises an upper lock head, a lower lock head and a lock chamber section, rotary gates are arranged at the upper lock head and the lower lock head respectively, each rotary gate comprises an arc-shaped gate, a gate leaf, a main shaft connected with the gate leaf, a circular cover plate, a supporting disc and a force-bearing telescopic rod capable of adjusting the gate toascend and descend, and the force-bearing telescopic rods are hydraulically driven. The gate leaf is provided with a blade grid with an adjustable opening degree so as to adjust the flow speed of water flow and achieve the fish luring effect. Gear mounting components are arranged at the upper ends of the force-bearing telescopic rods and can adjust and control rotation and lifting of the rotary gates. Lifting grooves are formed in the lock heads of the ship lock, and the rotary gates are controlled by the hydraulic drive telescopic rods to partially settle in the lifting grooves when navigation, flood drainage and the like are needed. The fishway and the ship lock are combined into a whole, so that the cost is saved; and multiple functions of fish luring, rotary fish expelling, navigation,water retaining, flood draining and the like can be achieved.

The invention provides a two-way water-blocking gas shield dam which comprises a dam body arranged on the concrete foundation and arranged between two side walls. The dam body comprises more than one combined gas shield dam single body. The two-way water-blocking gas shield dam is characterized in that the gas shield dam single body comprises a first water-blocking plate, a second water-blocking plate with the same width as the first water-blocking plate, and a gas bag located between the first water-blocking plate and the second water-blocking plate, the upper end of the first water-blocking plate is connected with the upper end of the second water-blocking plate, the lower end of the first water-blocking plate and the lower end of the second water-blocking plate are connected to the concrete foundations through anchoring pieces, and the middle of the second water-blocking plate can be folded. Compared with the prior art, the two-way water-blocking gas shield dam can effectively prevent the gas bag from being exposed to the weather so as to prevent aging, the safety and durability of the gas shield dam system are greatly improved, the closed structure can protect the gas bag against manual damage, and maintenance cost and security cost can be reduced as well.

The invention relates to the design for fish ways of an ecological dam, in particular to a rotating door structure which can be driven by water power or electric power and can allow fish to freely come in and go out of the two sides of the dam in a wet season or in a dry season. The problem of contradiction between dam building and ecological protection is well solved. The rotating door structure is horizontally located in a dam body and communicated with a water body on the high water level side of the dam and a water body on the lower water level side of the dam through a duct. A lower water rotating door and an upper water rotating door form a set, spindles of the two doors are meshed through gears, the rotating directions of the two doors are opposite, the lower water rotating door is a driving rotating door and rotated under the push of high water level side water power, and the upper water rotating door is a driven rotating door and pushed by the lower water rotating door through the gears. The length and the width of the lower water rotating door are slightly larger than the length and the width of the upper water rotating door, and therefore it is guaranteed that the pushing force of the lower water rotating door is larger than resistance of the upper water rotating door.

The invention discloses an eco-friendly riverway bank protection structure which comprises a bottom platform arranged at the slope toe and a middle platform arranged at a medium water level position.The bottom platform and the middle platform are connected through a lower slope, toe protection flexible net bags filled with fish spawning nest blocks are pressed on the bottom platform, and the middle platform is connected with the top of a bank slope through an upper slope. The middle platform is paved with diamond ecological bank protection blocks which are provided with vertically-through planting grooves, and mutually-communicating artificial fish ways are arranged on four side faces of each ecological bank protection block. The upper slope and the lower slope are each formed by stackingfish spawning nest net cages, and penetrating net pipes are arranged in the middle of the fish spawning nest net cages. The eco-friendly riverway bank protection structure can meet the requirement for stability of a riverway slope bank, can prevent acute evolution of a riverbed, and can create conditions for plant growth and animal inhabitation, engineering and environment are well integrated, and the requirements for ecology, landscape, bank protection and other aspects are met.

Present invention comprises a separate bypass channel that is installed on one side of the dam connecting upstream and downstream; water supply for fish ladder which is installed upstream, spillway wall disposed downstream of dam and having groove, a first fish ladder facility which connects said water supply and the spillway wall and has a predetermined number of the partition wall with a passage opening respectively, which are structured in a stepwise manner The first even and facility are installed on the upstream side inlet of the bypass channel is configured; and a second fish ladder facility which comprises inclined channel installed for discharging water to the side of the dam, sloping and comb wall contiguous installed to alternately at predetermined intervals on both sides of the main wall of the inclined channel, and movement passage in the shape of pipe shape that connects upstream and downstream on the inner bottom of the dam, which is provided in the middle of said bypass channel.

The present invention discloses a fish swimming capability testing device and method. The fish swimming capability testing device comprises a closed annular water tank, a water flow driving device anda flow rate measurement device, a first testing area and a second testing area are arranged in the closed annular water tank, the first testing area comprises a first testing section, and a first rectifying grid plate and a first flow guiding grid plate separately positioned at upper and lower parts of the first testing section, the second testing area comprises a second testing section, and a second rectifying grid plate and a second flow guiding grid plate separately positioned at upper and lower parts of the second testing section, and a water passing area adjusting device is also arrangedon the second testing section; a driving end of the water flow driving device extends into the closed annular water tank and is arranged at the upper part of the second testing area; and the flow rate measurement device is arranged in the first or second testing area. Swimming ability parameter indexes obtained by tests are applied to designs of fish ways such as gate dams, etc., so that fish passing efficiency of the fish ways is improved, and a function of the fish ways serving as the only ecological compensation engineering measure is further exerted.

The invention discloses a fishway effect evaluation method based on a stable isotope method, and belongs to the technical field of fishway effect evaluation. The fishway effect evaluation method comprises the steps of stable isotope ratio determination, nutrition ecological niche estimation and fishway construction effectiveness evaluation. According to the evaluation method, one or more migratory fishes at the upstream and downstream of the hydraulic engineering are studied, and whether fishway construction eliminates the influence of the hydraulic engineering on one or more migratory fishes or not is judged and quantitatively explained from the ecological system level through comparative analysis of stable isotopes; the method has the characteristics of quick detection and stable result.