Swinging fish passing system capable of improving connectivity of river channel and operation method of swinging fish passing system

Abstract

The invention relates to the technical field of aquatic ecology, and discloses a swinging fish passing system for improving the connectivity of a river channel and an operation method of the swinging fish passing system. The swinging fish passing system comprises swinging fish passing facilities and a water gate, the swinging fish passing facilities are arranged on the upstream or downstream of the water gate, one or more swinging fish passing facilities are arranged in the direction perpendicular to the water flow direction at intervals, and fish passing channels are formed between the swinging fish passing facilities and the river bank and between every two adjacent swinging fish passing facilities. The swinging fish passing facility has a flow making state and a flow passing state, the swinging fish passing facility performs pendulum type movement in the direction perpendicular to the water flow direction in the flow making state, and the swinging fish passing facility is parallel to the water flow direction in the flow passing state. The swinging fish passing facility can be arranged in a low-water-head-difference and low-flow-speed river channel, and the swinging fish passing facility can create a proper and stable-flow-speed environment to attract fishes to trace upstream against water according to fish passing objects and swimming capacity characteristics of the fish passing objects in a flow generation state; and in the overflowing state, the overflowing state of the river channel cannot be hindered, and the flow resistance is small.

Description

Technical Field

[0001] The present invention relates to the technical field of aquatic ecology, and particularly relates to a swing fish passage system for improving river connectivity and an operation method thereof. Background Art

[0002] Constructions such as river dams and sluice gates artificially cut off the longitudinal connectivity of the river course, resulting in fragmentation of fish habitats, affecting the migratory needs of fish and the living and distribution space of their survival. A fish passage facility refers to a structure and mechanical device set up for fish to pass through the river-blocking sluice dam to reach the spawning or cultivation place. The fish passage facility can dredge the migratory passage, help fish complete their life history, protect and develop river fish resources, and contribute to maintaining the original ecological balance of the river course.

[0003] According to the different water head differences between the upstream and downstream of the sluice dam, common fish passage facilities include fishways, fish ladders, fish collection and transportation facilities, or constructing natural-like channels, etc. A fishway is built with an artificial water trough on the sluice or dam for fish to migrate and pass through. A fish ladder is set up with a series of water troughs, pools or steps on the sluice or dam to simulate the natural water flow environment so that fish can swim upstream against the current. A fish collection and transportation facility is a facility that collects fish through devices such as fish transport boats and fish transport vehicles, and uses a land-based fish transport system to send the blocked fish to the other end for release.

[0004] These different fish passage facilities can all meet the fish passage needs to a certain extent, but from the perspective of the whole life cycle, each method and measure requires a relatively large cost for continuous fish passage. Moreover, fish ladders and fish collection and transportation facilities are generally set in river courses with relatively high water head differences between the upstream and downstream. Although fishways and natural-like channels can be used in river courses with relatively small water head differences between the upstream and downstream, it is difficult to form a relatively stable water flow velocity in plain river network areas or areas with relatively slow water flow to attract fish to swim upstream against the current. Summary of the Invention

[0005] In view of this, the present invention provides a swing fish passage system for improving river connectivity and an operation method thereof to solve the problem that the existing fish passage facilities cannot form a stable water flow velocity in river courses with low water head differences and low water flow velocities to attract fish to swim upstream against the current.

[0006] In a first aspect, the present invention provides a swing fish passage system for improving river connectivity, which is set in a river course with a low water head difference and a low water flow velocity, and includes:

[0007] Swing fish - passing facility and sluice, the swing fish - passing facility is arranged upstream or downstream of the sluice, one or multiple swing fish - passing facilities are arranged at intervals along the direction perpendicular to the water flow, a fish - passing channel is formed between the swing fish - passing facility and the river bank and between two adjacent swing fish - passing facilities, the swing fish - passing facility has a flow - creating state and a flow - passing state. In the flow - creating state, the swing fish - passing facility makes a pendulum - like motion around the direction perpendicular to the water flow; in the flow - passing state, the swing fish - passing facility is arranged parallel to the water flow direction.

[0008] Beneficial effects

[0009] The swing fish - passing system can be arranged at a river section with a low water - head difference and low - velocity water flow environment. When there is a need for flow - creating, the swing fish - passing facility makes a pendulum - like reciprocating motion around the direction perpendicular to the water flow. According to the fish - passing objects and their swimming ability characteristics, the motion parameters of the swing fish - passing facility are adjusted, so as to improve the original water flow state of the river channel, and then create a suitable and stable flow - velocity environment to attract fish to swim upstream against the current. When there is no need for flow - creating, the swing fish - passing facility is arranged parallel to the water flow direction in the flow - passing state. The swing fish - passing facility will not impede the water flow, has a small flow resistance, and the river channel is close to the natural circulation state.

[0010] In an alternative embodiment, the swing fish - passing facility includes:

[0011] Base;

[0012] Swing - arm assembly, the swing - arm assembly includes: a long swing arm, the height L of the long swing arm h has a value range of: [50 cm, (D - 40) cm], where: D is the water depth of the river channel;

[0013] Drive assembly, the drive assembly includes: a long - swing - arm drive mechanism, the long - swing - arm drive mechanism includes: a first drive member and a long - swing - arm transmission member. The first drive member is arranged inside the base, one end of the long - swing - arm transmission member is connected to the drive end of the first drive member, and the other end is provided with the long swing arm. The first drive member is adapted to drive the long swing arm to rotate around the long - swing - arm transmission member.

[0014] Beneficial effects

[0015] The swing fish - passing facility takes into account the water - depth requirements. In addition to meeting the middle - and upper - layer fish, it can also fully take care of the fish living at the bottom and having the need for migration. The range of swing fish - passing objects is wider.

[0016] In an alternative embodiment, the swing - arm assembly further includes: two short swing arms, the two short swing arms are respectively arranged at both ends of the long swing arm, each short swing arm includes two swing parts, and the swing part is rotationally connected to the long swing arm;

[0017] The driving assembly further includes: a short swing arm driving mechanism, which includes: a second driving member and a short swing arm transmission member. The second driving member is disposed within the base, and a driving end of the second driving member is connected to the short swing arm transmission member. The short swing arm transmission member is further connected to the swinging portion. The short swing arm driving mechanism is adapted to drive the swinging portion to rotate around the long swing arm.

[0018] Beneficial effects

[0019] After the short swing arm is provided, its state can be changed through the short swing arm driving mechanism. When the short swing arm rotates to a state perpendicular to the long swing arm, it can perform a pendulum-like motion synchronously with the long swing arm, which can enhance the effect of disturbing the water flow. The change range of the water flow velocity is wider, and more species of fish can be attracted. When the short swing arm rotates to a state parallel to the long swing arm, it can minimize the obstruction of the swing fishway to the water flow to the greatest extent, and the flow resistance is small. The combined use of the long swing arm and the short swing arm, and the coordinated movement can create a suitable and stable environment with different flow velocities to attract different species of fish to swim upstream against the current.

[0020] In an alternative embodiment, the cross-sectional projected width D of the fish passage s is calculated by the formula: D b is the reference width of the fish passage, and the value range of D b is [12 cm, 30 cm]; L is the length of the long swing arm; θ is the swing angle of the long swing arm, and the value range of θ is [15°, 25°].

[0021] In an alternative embodiment, the swing period of the long swing arm is 2t, where t is the time taken for the long swing arm to swing once, and the value range of t is where: L is the length of the long swing arm; V k is the preferred flow velocity of the fish passage object; L d is the length of the short swing arm; V z is the limit flow velocity of the fish passage object;

[0022] The fixed swing angular velocity ω of the long swing arm is calculated by the formula: as follows.

[0023] In an alternative embodiment, the flow velocity at any position L r on the long swing arm is calculated by the formula: V r = ωL r Cosθ, where: V r is the flow velocity perpendicular to the river channel at position L r ; L r is the length of this position from the swing center; t is the time taken for the long swing arm to swing once.

[0024] In an alternative embodiment, the swing fish passage system further comprises: a control line and a protective sleeve, wherein the control line is connected to the drive assembly and a controller on the river bank, and the protective sleeve is sleeved on the control line.

[0025] In an alternative embodiment, the swing fish passage system further comprises: a fish detector disposed at the sluice, and the fish detector is connected to the sluice.

[0026] Beneficial effects

[0027] By providing a fish detector to sense the number of fish, the opening and closing of the sluice is controlled.

[0028] Second, the present invention further provides a method for operating a swing fish passage system for improving river connectivity, which is applied to the fish passage system, and includes:

[0029] During the fish passage period:

[0030] Under normal water conditions, when the water head difference between the upstream and downstream of the sluice is small, the sluice is in an open state, and the swing fish passage facility is in a flow generating state to attract fish to pass through the fish passage and the sluice; when the water head difference between the upstream and downstream of the sluice is large, the swing fish passage facility is in a flow generating state to attract fish to gather in front of the sluice, and the sluice is intermittently opened to allow the fish school to pass through;

[0031] Under flood water conditions, the swing fish passage facility is in a flow through state to allow fish to directly pass through the sluice;

[0032] During the non-fish passage period:

[0033] When the sluice is opened, the swing fish passage facility is in a flow through state.

[0034] Beneficial effects

[0035] This method for operating a swing fish passage system can meet the fish passage requirements and flow through requirements of the river in different periods and different water condition environments through the linkage cooperation of the swing fish passage facility and the sluice.

[0036] In an alternative embodiment, when the swing fish passage facility is in a flow generating state, the long swing arm is perpendicular to the short swing arm;

[0037] When the swing fish passage facility is in a flow through state, the long swing arm is parallel to the short swing arm. Description of the drawings

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic diagram of the operation of the swing fishway system of the present invention under normal water conditions during the fish passage period;

[0040] Figure 2 It is a schematic diagram of the operation of the swing fishway facility of the present invention under normal water conditions during the fish passage period;

[0041] Figure 3 It is a schematic diagram of the operation of the swing fishway system of the present invention under flood water conditions during the fish passage period;

[0042] Figure 4 It is a schematic diagram of the operation of the swing fishway facility of the present invention under flood water conditions during the fish passage period;

[0043] Figure 5 It is a schematic diagram of the swing fishway system of the present invention when the sluice is closed during the non-fish passage period;

[0044] Figure 6 It is a schematic diagram of the swing fishway facility of the present invention when the sluice is closed during the non-fish passage period;

[0045] Figure 7 It is a schematic diagram of the swing fishway facility of the present invention;

[0046] Figure 8 It is a schematic diagram of the short swing arm transmission member in the swing fishway facility of the present invention.

[0047] Explanation of reference numerals:

[0048] 1. Swing fishway facility;

[0049] 11. Base;

[0050] 121. Long swing arm, 122. Short swing arm, 1221. Swing part;

[0051] 1311. Long swing arm transmission member, 1321. Horizontal transmission rod, 1322. Swing arm transmission rod, 1323. Bevel gear;

[0052] 14. Vertical rod;

[0053] 2. Sluice;

[0054] 3. Control line;

[0055] 4. Protective sleeve. Detailed implementation manners

[0056] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0057] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0058] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0059] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0060] The following combines Figures 1 to 8 , to describe the embodiments of the present invention.

[0061] According to an embodiment of the present invention, on the one hand, a swing fish passage system for improving river connectivity is provided, which is arranged in a river channel with a low head difference and a low flow velocity, and includes: a swing fish passage facility 1 and a sluice 2. The swing fish passage facility 1 is arranged upstream or downstream of the sluice 2. One or a plurality of swing fish passage facilities 1 are arranged at intervals along the direction perpendicular to the water flow. The swing fish passage facility 1 forms a fish passage with the river bank and between adjacent two swing fish passage facilities 1. The swing fish passage facility 1 has a flow generating state and a flow passing state. In the flow generating state, the swing fish passage facility 1 performs a pendulum-like movement around the direction perpendicular to the water flow. In the flow passing state, the swing fish passage facility 1 is arranged parallel to the water flow direction.

[0062] The swing fish - passing facility 1 has a flow - creating state and a flow - passing state, which is adapted to different working conditions. When there is a need for fish passage in the river channel and it is necessary to create a suitable flow velocity environment, the swing fish - passing facility 1 is in the flow - creating state, that is, the swing fish - passing facility 1 continuously performs a pendulum - like movement. In this way, the swing fish - passing facility 1 can change the river channel water flow environment and create a suitable and stable flow velocity environment to attract fish to swim upstream against the water flow from the fish - passing channel. When there is no fish - passing demand in the river channel or there is no need to change the current flow velocity environment of the river channel, the swing fish - passing facility 1 is in the flow - passing state. At this time, the swing fish - passing facility 1 is arranged parallel to the water flow direction and remains stationary. In this way, the flow resistance is small and it will not obstruct the river channel water flow, making the river channel close to the natural circulation state.

[0063] The sluice 2 establishes a cut - off of the entire flow - passing cross - section of the river channel at a determined position according to the engineering functions and design requirements. According to the functions, the sluice 2 can be divided into a regulating sluice, a water intake sluice 2, a flood - diversion sluice, a drainage sluice 2, and a tide - blocking sluice. Whether the control method is in the form of gravity - type, lifting - type, rotary - type, sliding - type, or straight - through - type, it is required to ensure the opening and closing of the gate through its own and external forces. The sluice 2 controls the on - off of the river channel. When there is a demand for fish passage or flow - passing, the sluice 2 will be opened.

[0064] The swing fish - passing facility 1 can be set upstream or downstream of the sluice 2. Generally, it is set on one side close to the apron, the upstream connection section or the downstream connection section for anti - scouring. Its layout methods are also diverse. It is arranged according to its own size, the river channel size, the flow velocity requirements of the fish - passing object, etc. For example, it can be arranged in a single row, a single column, or multiple rows and columns. Specifically, in this embodiment, the swing fish - passing facility 1 is set upstream of the sluice 2. There are two swing fish - passing facilities 1 arranged at intervals, that is, there are a total of three fish - passing channels in the river channel.

[0065] In some embodiments, the swing fish - passing facility 1 includes: a base 11, a swing - arm assembly, and a driving assembly. The swing - arm assembly includes a long swing - arm 121. The height L of the long swing - arm h ranges from [50 cm, (D - 40) cm], where D is the water depth of the river channel. The driving assembly includes: a long swing - arm driving mechanism. The long swing - arm driving mechanism includes: a first driving member and a long swing - arm transmission member 1311. The first driving member is arranged inside the base 11. One end of the long swing - arm transmission member 1311 is connected to the driving end of the first driving member, and the other end is provided with the long swing - arm 121. The first driving member is adapted to drive the long swing - arm 121 to rotate around the long swing - arm transmission member 1311.

[0066] As Figure 7 described, the base 11 is a platform fixed to the bottom of the water, providing a stable support for the swing fish - passing facility 1. In this embodiment, the base 11 is a concrete square platform with a cross - sectional size of 200×300 mm and a buried depth of about 500 mm. The long swing - arm driving mechanism can drive the long swing - arm 121 to rotate. The height L of the long swing - arm hThe value range of is: [50 cm, (D - 40) cm]. In this way, the swing fish - passing facility can comprehensively consider the water - depth requirements. In addition to meeting the needs of mid - upper - layer fish, it can also fully take care of the fish living at the bottom and having migratory needs, so the range of fish - passing objects of the swing is wider.

[0067] Furthermore, the long swing - arm driving mechanism includes: a first driving member and a long swing - arm transmission member 1311. The first driving member is preferably a motor, and the motor can be arranged in the base 11. The long swing - arm transmission member 1311 is mainly for transmission, transmitting the power output by the motor to the long swing - arm 121 to drive the long swing - arm 121 to rotate. In this embodiment, the long swing - arm transmission member 1311 is a rotating shaft. The long swing - arm 121 is in a flat - plate shape and can be made of metal materials such as high - strength galvanized steel plates. The long swing - arm 121 is fixedly connected to the upper half of the rotating shaft, and the axis of the long swing - arm transmission member 1311 (rotating shaft) is located at the middle position of the length direction of the long swing - arm 121. When the motor drives the rotating shaft to rotate, the entire long swing - arm 121 can be driven to rotate. When the motor drives the long swing - arm 121 to rotate to the direction perpendicular to the water flow and then performs a pendulum - like motion, the swing fish - passing facility 1 is in the flow - creating state. When the motor drives the long swing - arm 121 to rotate to the direction parallel to the water flow, the swing fish - passing facility 1 is in the flow - passing state.

[0068] In one embodiment, the swing fish - passing facility 1 further includes a vertical rod 14, and the vertical rod 14 is sleeved on the rod section of the long swing - arm transmission member 1311 located between the long swing - arm 121 and the base 11.

[0069] Specifically, the vertical rod 14 can be a cylindrical reinforced concrete column with a hollow interior through which the long swing - arm transmission member 1311 can pass.

[0070] In some embodiments, the swing - arm assembly further includes: two short swing - arms 122. The two short swing - arms 122 are respectively arranged at both ends of the long swing - arm 121. Each short swing - arm 122 includes two swinging parts 1221, and the swinging parts 1221 are rotatably connected to the long swing - arm 121.

[0071] Two short swing arms 122 are respectively arranged at both ends of the long swing arm 121. The length of the short swing arm 122 is less than that of the long swing arm 121. The short swing arm 122 is made of PVC material or other lightweight, ultraviolet-resistant and hard materials. And each short swing arm 122 is composed of two swing parts 1221. The two swing parts 1221 have the same shape and size, and are both rotatably connected to the long swing arm 121. Generally, the length dimension of the swing part 1221 is 300-400mm. When the swing fishway 1 is in the flow creation state, the corresponding short swing arm 122 rotates to a state perpendicular to the long swing arm 121, that is, the two swing parts 1221 rotate respectively until they are perpendicular to the long swing arm 121. At this time, the two short swing arms 122 and the long swing arm 121 form an "I" shape. At this time, the setting of the short swing arm 122 can enhance the flow disturbance effect of the swing fishway 1, the change range of the water flow velocity is wider, and more species of fish can be attracted. The length of the "I"-shaped swing arm assembly is 100-200cm, the width is 30cm, and the height is 50-100cm. The top of it is 0.2m away from the water surface, and the bottom is 0.2m away from the river bottom. When the swing fishway 1 is in the flow-through state, the two swing parts 1221 rotate respectively until they are parallel to the long swing arm 121. At this time, the two short swing arms 122 and the long swing arm 121 form a straight line. At this time, the short swing arm 122 can also minimize the obstruction of the swing arm assembly to the water flow, and the flow resistance is small.

[0072] In some embodiments, the drive assembly further includes: a short swing arm drive mechanism. The short swing arm drive mechanism includes: a second drive member and a short swing arm transmission member. The second drive member is arranged in the base 11, and the drive end of the second drive member is connected to the short swing arm transmission member. The short swing arm transmission member is connected to the swing part 1221. The short swing arm drive mechanism is adapted to drive the swing part 1221 to rotate around the long swing arm 121.

[0073] In this embodiment, a short swing arm drive mechanism is adopted to control the rotation of the two swing parts 1221 of the short swing arm 122. Specifically, the second drive member is arranged in the base 11 and is also selected as a motor. The short swing arm 122 transmission member realizes the transmission of power transmission, so as to drive the swing part 1221 to rotate to the required angle through the second drive member (motor).

[0074] Exemplarily, the short swing arm transmission member includes: a vertical transmission rod, a horizontal transmission rod 1321 and a swing arm transmission rod 1322. The vertical transmission rod is arranged in the long swing arm transmission member 1311 and is connected to the drive end of the second drive member at one end. The horizontal transmission rod 1321 is arranged on the long swing arm 121 and is perpendicular to the vertical transmission rod. The horizontal transmission rod 1321 is in transmission connection with the other end of the vertical transmission rod. Each swing part 1221 is fixedly connected to a swing arm transmission rod 1322. The long swing arm 121 is rotatably connected to the swing arm transmission rod 1322. The two swing arm transmission rods 1322 at the same end of the long swing arm 121 are arranged at intervals up and down and are in transmission connection with the end of the horizontal transmission rod 1321.

[0075] The transmission path of the short swing arm 122 transmission member is from the base 11 to the end of the long swing arm 121, and the transmission path is relatively long. Specifically, as Figure 2 shown, first, a vertical transmission rod is arranged inside the long swing arm transmission member 1311. The vertical transmission rod is driven by a second driving member (motor), and the axis of the vertical transmission rod is located at the middle position in the length direction of the long swing arm 121. Its upper end is located at the middle position in the height direction of the long swing arm 121, and a bevel gear 1323 is arranged at the upper end of the vertical transmission rod. A bevel gear 1323 is also arranged in the middle of the transverse transmission rod and meshes with the bevel gear 1323 on the vertical transmission rod to achieve a transmission connection. In this way, the second driving member can drive the transverse transmission rod 1321 to rotate. The two ends of the transverse transmission rod respectively extend to the two ends of the long swing arm 121, and bevel gears 1323 are also arranged at the two ends of the transverse transmission rod.

[0076] Furthermore, in a short swing arm 122, one of the swing parts 1221 is fixedly connected to an upper swing arm transmission rod 1322, and the other is fixedly connected to a lower swing arm transmission rod 1322. Bevel gears 1323 are arranged on both swing arm transmission rods 1322 and can mesh with the bevel gears 1323 at the ends of the transverse transmission rod. The long swing arm 121 is connected to both the upper and lower swing arm transmission rods 1322, but the connection method is a rotational connection. In this way, when the transverse connecting rod rotates, it can drive the swing arm transmission rod 1322 to rotate, and then can drive the swing part 1221 to rotate freely, while the long swing arm 121 does not rotate.

[0077] The setting of the short swing arm 122 transmission member can realize the driving of the second driving member on the swing part 1221, so that the short swing arm 122 can be controlled to rotate adaptively in cooperation with the long swing arm 121 for cooperative work.

[0078] In some embodiments, the cross-sectional projected width D of the fish passage s is calculated by the formula: where: D b is the reference width of the fish passage, which can be selected with reference to the relevant provisions of the partition fishway in the Design Guide for Fishways in Water Conservancy and Hydropower Projects (SL609-2013), and the value range is generally [12 cm, 30 cm]; L is the length of the long swing arm; θ is the swing angle of the long swing arm, and the value range of θ is [15°, 25°].

[0079] In some embodiments, the swing period of the long swing arm is 2t, where t is the time taken for the long swing arm to swing once, and the value range of t is where: L is the length of the long swing arm; V k is the preferred flow velocity of the fish passage object; L d is the length of the short swing arm; V zis the limiting flow velocity for fish passage objects.

[0080] The fixed swing angular velocity ω of the long swing arm is calculated by the formula where θ is the swing angle of the long swing arm, and the value range of θ is [15°, 25°].

[0081] In some embodiments, at any position L on the long swing arm r the flow velocity is calculated by the formula: V r = ωL r Cosθ, where: V r is the flow velocity perpendicular to the river channel at L r and L r is the length of this position from the swing center; t is the time taken for the long swing arm to swing once.

[0082] In some embodiments, the swing fish passage system further includes: a control line 3 and a protective sleeve 4. The control line 3 is connected to the driving assembly and the controller on the river bank, and the protective sleeve 4 is sleeved on the control line 3.

[0083] The control line 3 connects the driving assembly (such as the first driving member, the second driving member) in the swing fish passage facility 1 and the control room on the river bank, so as to facilitate the staff to perform operations and control the action of the moving fish passage facility. Since the control line 3 will be laid in water, a protective pipe sleeve is sleeved outside it for protection to prevent electrical accidents.

[0084] In some embodiments, the swing fish passage system further includes: a fish detector arranged at the sluice 2, and the fish detector is communicatively connected to the sluice 2. The fish detector can detect the number of fish schools and control the opening and closing of the gate according to the number of fish.

[0085] Exemplarily, the river channel is 15 m wide, a single sluice gate 2 is 2 m wide, the water depth at the normal water level is 1.5 m, and the fish to pass through is the typical anadromous fish Coilia nasus. Coilia nasus usually inhabits at the bottom layer, and mostly moves in the middle and upper layers of the water body during migration. The age of the first sexual maturity of Coilia nasus is mainly 2 years old, the body length is about 0.10 - 0.33 m, and the body length of the smallest sexually mature female fish is about 20 cm. The preferred flow velocity is 0.2 - 0.5 m / s, and the limit flow velocity is 0.4 - 0.7 m / s. The swing fishway facility 1 is placed at the upstream connection section of a sluice gate 2 in the parallel multi - hole sluice gates in the river channel. Considering the width of the sluice gate and the benthic living habit of Coilia nasus comprehensively, the length, width and height of the swing arm assembly are determined to be 120×30×110 cm respectively. Considering the back width of the fish and the swing amplitude of the tail, the maximum width of the effective fish - passing channel to be formed is about 30 cm, and the effective width of the instantaneous projection formed by the swing of the swing arm assembly is 12 cm. Therefore, gaps of 18 cm need to be reserved on both sides between the swing fishway facility 1 and the river bank for the anadromous Coilia nasus to pass through, ensuring that the fish will not be squeezed and injured when passing through the fish - passing device. When the water head difference between the upstream and downstream is large, in the early stage, by not swinging or swinging slowly, the flow velocity that is unfavorable to the fish generated by the water head difference is eliminated. When the water level difference between the upstream and downstream is constant, or there is no water head difference between the upstream and downstream of the sluice gate 2, during the fish - passing period, the swing arm assembly can swing back and forth at an interval of t = 15 s within a range of 15° in the direction perpendicular to the river channel flow. When the distance from the long swing arm to the swing center is 41 cm, a water flow with a flow velocity of 0.4 m / s in the direction perpendicular to the river channel can be created, meeting the required flow velocity of the fish - passing object Coilia nasus.

[0086] On the one hand, the present embodiment also provides an operation method for a swing fishway system for improving river channel connectivity, which is applied to the swing fishway system. The structure of the swing fishway system is the same as that of the swing fishway system in the above - mentioned embodiment, and will not be elaborated here.

[0087] The operation method performs different operations according to different periods:

[0088] During the fish - passing period:

[0089] Under normal water conditions, when the water head difference between the upstream and downstream of the sluice gate is small, the sluice gate is in the open state, and the swing fishway facility is in the flow - creating state, attracting fish to pass through the fish - passing channel and the sluice gate; when the water head difference between the upstream and downstream of the sluice gate is large, the swing fishway facility is in the flow - creating state to attract fish to gather in front of the sluice gate, and the sluice gate is intermittently opened to let the fish school pass through;

[0090] Such as Figure 1 、 Figure 2As shown, during the fish passage period, there is a need for fish passage, but the flow velocity under normal water conditions does not meet the requirement for attracting fish. Therefore, the swing fish passage facility needs to be in a flow generation state to create a suitable water flow environment. Specifically, at this time, the swing arm assembly first rotates to a state perpendicular to the water flow, and then under the action of the drive assembly, the swing arm assembly is driven to perform a pendulum-like motion, and the swing angle is generally between 15° and 25°. The continuous swing of the swing arm assembly can disturb the water flow, change the water flow velocity, and create a suitable and stable flow velocity environment to attract the corresponding fish to pass through the fish passage.

[0091] The state of the sluice is adjusted according to the magnitude of the water head difference. When the water head difference between the upstream and downstream of the sluice is small, the sluice is in an always-open state, and fish can pass directly through the fish passage and the sluice. However, when the water head difference between the upstream and downstream of the sluice is large, the sluice is intermittently opened, that is, fish will gather in front of the sluice, and a fish detector can be used to detect the number of fish. When the number of fish is large, the sluice 2 is controlled to open to allow the fish to pass through the sluice 2.

[0092] Under flood water conditions, the swing fish passage facility 1 is in a flow-through state to allow fish to pass directly through the sluice 2;

[0093] Such as Figure 3 、 Figure 4 As shown, if a flood condition occurs during the fish passage period, due to the large water volume and fast water flow velocity, the swing arm assembly should first be rotated to be parallel to the water flow direction to prevent the water flow from washing away the swing fish passage facility 1, and then the sluice 2 can be opened to allow the water flow and fish to pass through.

[0094] During the non-fish passage period:

[0095] When the sluice 2 is opened, the swing fish passage facility 1 is in a flow-through state.

[0096] During the non-fish passage period, there is no need for fish passage, but when the sluice 2 is opened, it is necessary to ensure that the swing arm assembly rotates to be parallel to the water flow direction to reduce the resistance and interference of the swing fish passage facility 1 to the water flow and make the river channel close to the natural flow state.

[0097] When the sluice 2 is closed, the state of the long swing arm 121 is not restricted and can be in a state perpendicular to the water flow (as Figure 5 、 Figure 6 shown) or parallel to the water flow state. If there are requirements for the physical and chemical properties of the water body, the swing arm assembly can also be operated to swing to play roles such as stirring and oxygenation and improving the flow velocity.

[0098] In one embodiment, when the swing fish passage facility 1 is in a flow generation state, the long swing arm 121 is perpendicular to the short swing arm 122.

[0099] That is, when the long swing arm 121 rotates to be perpendicular to the water flow direction and is about to perform a pendulum-like motion, the short swing arm 122 is driven by the short swing arm 122 driving mechanism to rotate to be perpendicular to the long swing arm 121. In this way, the overall swing arm assembly is in an "I" shape, and the effect of disturbing the water flow is better.

[0100] In one embodiment, when the swing fishway 1 is in a flow-through state, the long swing arm 121 is parallel to the short swing arm 122.

[0101] That is, when the long swing arm 121 rotates to a state parallel to the water flow direction, the short swing arm 122 is driven by the short swing arm 122 driving mechanism to rotate to be parallel to the long swing arm 121. In this way, the overall swing arm assembly is in a straight line shape, and the water resistance is smaller.

[0102] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A swinging fish passing system for improving river connectivity, arranged in a river with low head difference and low flow rate, characterized in that: include: A swinging fish-passing facility (1) and a sluice gate (2), wherein the swinging fish-passing facility (1) is arranged upstream or downstream of the sluice gate (2), wherein one swinging fish-passing facility (1) is arranged vertically in the direction of water flow or a plurality of swinging fish-passing facilities (1) are arranged at intervals, wherein a fish-passing channel is formed between the swinging fish-passing facility (1) and the river bank and between two adjacent swinging fish-passing facilities (1), wherein the swinging fish-passing facility (1) has a flow-making state and a flow-passing state, wherein in the flow-making state, the swinging fish-passing facility (1) performs a pendulum-like motion perpendicular to the direction of water flow, and in the flow-passing state, the swinging fish-passing facility (1) is arranged parallel to the direction of water flow.

2. The swinging fish passing system according to claim 1, characterized in that: The swinging fish passing facility (1) comprises: Base (11); A swing arm assembly, the swing arm assembly comprising: a long swing arm (121), the height of the long swing arm L h The value range is: [50cm, (D-40)cm], where: D is the river depth; A driving assembly, the driving assembly comprising: a long swing arm driving mechanism, the long swing arm driving mechanism comprising: a first driving member and a long swing arm transmission component (1311), the first driving member being arranged in the base (11), one end of the long swing arm transmission component (1311) being connected to the driving end of the first driving member, and the other end being provided with the long swing arm (121), the first driving member being suitable for driving the long swing arm (121) to rotate around the long swing arm transmission component (1311).

3. The swinging fish passing system according to claim 2, characterized in that: The swing arm assembly further comprises: two short swing arms (122), the two short swing arms (122) being respectively arranged at two ends of the long swing arm (121), each of the short swing arms (122) comprising two swing parts (1221), the swing parts (1221) being rotatably connected to the long swing arm (121); The driving assembly further comprises: a short swing arm driving mechanism, the short swing arm (122) driving mechanism comprises: a second driving member and a short swing arm transmission component, the second driving member is arranged in the base (11), and the driving end of the second driving member is connected to the short swing arm transmission component, the short swing arm transmission component is also connected to the swing part (1221), and the short swing arm driving mechanism is suitable for driving the swing part (1221) to rotate around the long swing arm (121).

4. The swinging fish passing system according to claim 3, characterized in that: Cross-sectional projection width D of the fish passage s By formula: Calculated, where: D b is the reference width of the fish passage, D b The value range of is [12cm, 30cm]; L is the length of the long swing arm; θ is the swing angle of the long swing arm, and the value range of θ is [15°, 25°].

5. The swinging fish passing system according to claim 4, characterized in that: The swing period of the long swing arm is 2t, where t is the time it takes for the long swing arm to swing once. The value range of t is Where: L is the length of the long swing arm; V k The preferred flow rate for fish; L d is the length of the short swing arm; V z The limiting flow velocity for fish passing; The fixed swing angular velocity ω of the long swing arm is given by the formula: Calculated.

6. The swinging fish passing system according to claim 5, characterized in that: Any position L on the long swing arm r The flow velocity at V is calculated by the formula: r =ωL r Cosθ is calculated as: V r For L r The flow velocity perpendicular to the river channel, L r is the distance between this position and the swing center; t is the time taken for the long swing arm to swing once.

7. The swinging fish passing system according to claim 2, characterized in that: Also includes: A control line (3) and a protective sleeve (4), wherein the control line (3) is connected to a drive component and a controller on a river bank, and the protective sleeve (4) is sleeved on the control line (3).

8. The swinging fish passing system according to any one of claims 1 to 7, characterized in that: Also includes: A fish detector is arranged at the water gate (2), and the fish detector is connected to the water gate (2).

9. A method for operating a swinging fish passing system for improving river connectivity, applied to the fish passing system according to any one of claims 1 to 8, characterized in that: include: During the fishing season: Under normal water conditions, when the water head difference between the upstream and downstream of the water gate (2) is small, the water gate (2) is in an open state, and the swinging fish passing facility (1) is in a flow-generating state, attracting fish to pass through the fish passage and the water gate (2); when the water head difference between the upstream and downstream of the water gate (2) is large, the swinging fish passing facility (1) is in a flow-generating state to attract fish to gather in front of the water gate (2), and the water gate (2) is opened intermittently to allow the fish to pass through; Under flood conditions, the swinging fish-passing facility (1) is in a flow-through state, allowing fish to pass directly through the sluice gate (2); In the non-fishing season: When the sluice gate (2) is opened, the swinging fish passing facility (1) is in a flow-through state.

10. The method for operating the swinging fish passing system according to claim 9, characterized in that: When the swinging fish-passing facility (1) is in a flow-generating state, the long swing arm (121) and the short swing arm (122) are perpendicular to each other; When the swinging fish passing facility (1) is in a flow-through state, the long swing arm (121) and the short swing arm (122) are parallel.

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