Fishway

Abstract

The utility model provides a fishway which comprises a first side wall and a second side wall, an advancing channel for fishes to swim is formed between the first side wall and the second side wall, one end of the advancing channel is a first inlet, and the other end of the advancing channel is a second inlet. The first side wall comprises a plurality of first flow guide walls with arc-shaped cross sections, the first flow guide walls are sequentially connected end to end, and the opening sides of the first flow guide walls face the second side wall; the end, close to the second inlet, of each first flow guide wall is correspondingly connected with an arc-shaped auxiliary flow guide wall, the opening side of each auxiliary flow guide wall faces the arc center of the corresponding first flow guide wall, and a flow guide column is correspondingly arranged at the position, close to the corresponding auxiliary flow guide wall, of the opening side of each first flow guide wall. Gaps are formed between the diversion column and the first diversion wall and between the diversion column and the auxiliary diversion wall; the first inlet is located upstream of the riverway. According to the fishway, multi-stage energy dissipation and speed reduction are formed for water flow, and the energy dissipation effect is good; and a turbulent flow area formed in the fishway can also be used as a rest area, so that the fish backflow efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy projects, and particularly relates to a fishway. Background Art

[0002] A fishway, that is, a passage for fish migration, is a remedial measure taken due to the destruction of the fish migration passage by human activities. Generally, an artificial water trough is built on a sluice or dam to protect the habits of fish. The design of the fishway mainly considers the upstream migration habits of fish. Downstream of the sluice dam, fish often enter the fishway by relying on the attraction of the water flow. Fish swim upstream in the fishway by their own strength against the flow velocity.

[0003] Generally, the cross-section of the trough body of a common fishway is rectangular. The water level difference between the upstream and downstream of the water trough is divided into several small steps by partitions. There are fish holes on the partitions, and the redundant energy is eliminated by using water cushions, frictional resistance along the way, water flow impact and diffusion.

[0004] The energy dissipation effect of the water cushion, frictional resistance along the way, water flow impact and diffusion in the fishway affects the designed length of the fishway. The weaker the energy dissipation effect, the longer the designed fishway and the greater the engineering quantity. In addition, if the fishway is too long or the water flow is too fast, more physical strength of the fish needs to be consumed, which is not conducive to fish migration. Summary of the Utility Model

[0005] The embodiment of the utility model provides a fishway to solve the problems in the existing fishway design, such as weak energy dissipation effect and large physical strength consumption of fish, which are not conducive to migration.

[0006] To achieve the above purpose, the embodiment of the utility model adopts the following technical solutions:

[0007] A fishway includes a first side wall and a second side wall. A traveling passage for fish to swim through is formed between the first side wall and the second side wall. One end of the traveling passage is a first inlet, and the other end is a second inlet;

[0008] The first side wall includes a plurality of first diversion walls with circular-arc cross-sections. The first diversion walls are connected end to end in sequence, and the opening sides of the first diversion walls face the second side wall;

[0009] The second side wall includes a plurality of second diversion walls with circular-arc cross-sections. The second diversion walls are connected end to end in sequence, and the opening sides of the second diversion walls face away from the first side wall;

[0010] One circular-arc-shaped auxiliary diversion wall is correspondingly connected to the end of each first diversion wall close to the second inlet. The opening side of the auxiliary diversion wall faces the center of the arc of the first diversion wall. A diversion column is correspondingly arranged at the position of each first diversion wall close to the auxiliary diversion wall on the opening side. There are gaps between the diversion column and both the first diversion wall and the auxiliary diversion wall;

[0011] When the fishway is arranged in the river channel, the first inlet is located at the upstream of the river channel, and the second inlet is located at the downstream of the river channel.

[0012] Furthermore, the radian of the first guiding wall is π, and the radian of the auxiliary guiding wall is π / 2.

[0013] Furthermore, the profiles of the sides of the first guiding wall and the auxiliary guiding wall facing the guiding column are tangent.

[0014] Furthermore, the guiding column is cylindrical.

[0015] Furthermore, a plurality of first side walls are provided. In each first side wall, the opening sides of the respective first guiding walls face the same direction. Except for the traveling channel formed between the first side wall close to the second side wall and the second side wall, traveling channels are also formed between the respective first side walls.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The fishway of the present utility model fully combines fluid mechanics, enabling the water flow to form a turbulent flow under the action of the first guiding wall, the auxiliary guiding wall, and the guiding column. Moreover, the multiple first guiding walls in each first side wall form multi-stage energy dissipation and speed reduction for the water flow, and the energy dissipation effect is relatively good. In addition, the multiple turbulent flow regions formed in the fishway can also serve as rest areas for migratory fish, improving the fish migration efficiency. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of a single-channel embodiment of the fishway of the present utility model;

[0019] Figure 2 It is a schematic diagram of a multi-channel embodiment of the fishway of the present utility model.

[0020] Description of the Reference Numerals:

[0021] 1. First guiding wall; 2. Auxiliary guiding wall; 3. Guiding column; 4. Second guiding wall; 10. First side wall; 20. Second side wall; 30. First inlet; 40. Second inlet. Specific Embodiments

[0022] The following will describe in detail the specific embodiments of the present application with reference to the drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present application, and are not used to limit the present application.

[0023] As Figure 1-2 shown, the present utility model provides a fishway, and specifically provides embodiments of a single-channel fishway and a multi-channel fishway.

[0024] Specifically as Figure 1As shown, in the single-channel embodiment, the fishway includes a first sidewall 10 and a second sidewall 20. A travel channel for fish to swim through is formed between the first sidewall 10 and the second sidewall 20. One end of the travel channel is a first inlet 30, and the other end is a second inlet 40. The first sidewall 10 includes a plurality of first diversion walls 1 with circular-arc cross-sections. Each of the first diversion walls 1 is connected end to end in sequence, and the opening sides of each of the first diversion walls 1 face the second sidewall 20. The second sidewall 20 includes a plurality of second diversion walls 4 with circular-arc cross-sections. Each of the second diversion walls 4 is connected end to end in sequence, and the opening sides of each of the second diversion walls 4 face away from the first sidewall 10. As the main improvement of the present utility model, a circular-arc-shaped auxiliary diversion wall 2 is correspondingly connected to one end of each first diversion wall 1 near the second inlet 40. The opening side of the auxiliary diversion wall 2 faces the center of the arc of the first diversion wall 1. A diversion column 3 is correspondingly arranged at a position near the auxiliary diversion wall 2 on the opening side of each first diversion wall 1. There are gaps between the diversion column 3 and both the first diversion wall 1 and the auxiliary diversion wall 2.

[0025] When the fishway of the present utility model is arranged in a river channel with the first inlet 30 located upstream of the river channel and the second inlet 40 located downstream of the river channel, when the water flow moves in the travel channel, when passing through each first diversion wall 1, part of the unobstructed water flow will directly flow to the position of the next first diversion wall 1 (the water flow at the position of the next first diversion wall 1 will still be divided into unobstructed water flow and obstructed water flow, and so on), while another part of the obstructed water flow will first be diverted by the diversion column 3. Part of the diverted obstructed water flow flows along the first diversion wall 1 towards the auxiliary diversion wall 2, and another part of the diverted obstructed water flow flows along the auxiliary diversion wall 2 towards the first diversion wall 1, thereby forming a turbulent flow and reducing the overall water flow velocity in the travel channel. And the fish that need to swim upstream enter the travel channel from the second inlet 40. Even if the fish do not have enough strength to swim upstream halfway, they will be guided by the water flow to the turbulent flow areas formed by each first diversion wall 1. The water flow in this area is the slowest, and the fish can stay and rest in this area and then continue to move forward.

[0026] In a preferred embodiment, the radian of the first diversion wall 1 is π, and the radian of the auxiliary diversion wall 2 is π / 2. Further, to improve the effect of the obstructed water flow forming turbulent flow, the profiles of the sides of the first diversion wall 1 and the auxiliary diversion wall 2 facing the diversion column 3 are tangent. In addition, also for the purpose of improving the effect of the obstructed water flow forming turbulent flow, the diversion column 3 is set to be cylindrical.

[0027] As Figure 2 As shown, in the multi-channel embodiment, there are a plurality of first sidewalls 10. The opening sides of each of the first diversion walls 1 in each first sidewall 10 face the same direction. In addition to the travel channel formed between the first sidewall 10 closest to the second sidewall 20 and the second sidewall, travel channels are also formed between each of the first sidewalls 10.

[0028] The fishway of the present utility model fully combines fluid mechanics, enabling the water flow to form turbulent flow under the action of the first diversion wall, the auxiliary diversion wall and the diversion column, and the multiple first diversion walls in each first side wall form multi-stage energy dissipation and speed reduction for the water flow, with a better energy dissipation effect; in addition, the multiple turbulent flow regions formed in the fishway can also serve as rest areas for migratory fish, improving the fish migration efficiency.

[0029] The above embodiments only express the implementation manners of the present utility model, but should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A fishway, characterized in that, It includes a first side wall (10) and a second side wall (20). A travel channel for fish to swim through is formed between the first side wall (10) and the second side wall (20). One end of the travel channel is a first inlet (30), and the other end is a second inlet (40). The first side wall (10) includes a plurality of first diversion walls (1) with circular-arc cross-sections. The first diversion walls (1) are connected end to end in sequence, and the opening sides of the first diversion walls (1) face the second side wall (20). The second side wall (20) includes a plurality of second diversion walls (4) with circular-arc cross-sections. The second diversion walls (4) are connected end to end in sequence, and the opening sides of the second diversion walls (4) face away from the first side wall (10). At one end of each first diversion wall (1) close to the second inlet (40), an auxiliary diversion wall (2) in a circular-arc shape is correspondingly connected. The opening side of the auxiliary diversion wall (2) faces the center of the arc of the first diversion wall (1). At a position close to the auxiliary diversion wall (2) on the opening side of each first diversion wall (1), a diversion column (3) is correspondingly arranged. There are gaps between the diversion column (3) and both the first diversion wall (1) and the auxiliary diversion wall (2). When the fishway is arranged in the river, the first inlet (30) is located upstream of the river, and the second inlet (40) is located downstream of the river.

2. The fishway according to claim 1, characterized in that, The radian of the first diversion wall (1) is π, and the radian of the auxiliary diversion wall (2) is π / 2.

3. The fishway according to claim 1, wherein The profiles of the sides of the first diversion wall (1) and the auxiliary diversion wall (2) facing the diversion column (3) are tangent.

4. The fishway according to claim 1, characterized in that, The diversion column (3) is cylindrical.

5. The fishway according to any one of claims 1-4, characterized in that, A plurality of first side walls (10) are provided. The opening sides of the first diversion walls (1) in each first side wall (10) face the same direction. Except for the travel channel formed between the first side wall (10) closest to the second side wall (20) and the second side wall (20), travel channels are also formed between the first side walls (10).

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