Reinforcing structure and repairing method for habitat in river channel

Abstract

The invention provides a riverway habitat reinforcing structure and a repairing method, and the repairing method comprises the steps: determining the distribution positions and the number of a to-be-repaired riverway, a bionic island and a bionic dike dam in the riverway, and the distance between the adjacent parts of the to-be-repaired riverway, the bionic island and the bionic dike dam; a bionic island group is placed on a uniform river section at a river entrance, and the bionic island group comprises a first island unit, a second island unit, a third island unit and a fourth island unit; the first island unit, the second island unit, the third island unit and the fourth island unit are sequentially arranged in rows along the water flow direction; selecting bionic island monomers, and sequentially placing the bionic island monomers on uniform river channel sections at a river channel inlet along the water flow direction; bionic reinforcing dams are placed along the edges of the two sides of the river channel at intervals. According to the riverway habitat reinforcing structure and the restoration method, habitat diversity and species richness can be enriched, habitat heterogeneity is increased to support biological diversity, and rich ecological system services are provided.

Description

Technical Field

[0001] The present invention relates to the technical field of river channel regulation, and in particular to a river channel habitat reinforcement structure and a restoration method. Background Art

[0002] "In-channel habitat enhancement structures" primarily refer to specialized structures constructed in localized areas within a river using a combination of wood, stone, suitable plants, and other ecological engineering materials. Existing in-channel habitat enhancement and restoration efforts focus solely on the bank slopes, with limited regulatory effects on abiotic and biotic factors within the river, particularly on the riverbed. Constructed wetlands and detention ponds cannot achieve piston flow, meaning runoff from these structures fails to fully penetrate the soil as it passes over the surface. This prevents pollutants from being filtered and precipitated, rendering the wetlands and detention ponds ineffective. Over time, this can lead to soil erosion and a drop in groundwater levels.

[0003] In addition, as the environmental problems we face evolve from single factors to multiple factors and complexities, there is an urgent need to explore new technical methods to strengthen and restore the habitats within the river. Summary of the Invention

[0004] The present invention provides a river channel habitat reinforcement structure and restoration method that can create curved edges for straight river channels, enrich habitat diversity and species richness, increase habitat heterogeneity to support biodiversity, and thus provide rich ecosystem services.

[0005] The technical solution adopted by the present invention is: a method for restoring habitats in a river, which comprises the following steps:

[0006] (1) The river to be restored shall be determined based on the river basin scope, hydrological characteristics and water quality treatment requirements of the river to be restored, and the distribution location, number and distance between adjacent bionic islands and bionic embankments in the river shall be determined; the distance between bionic islands shall be determined based on the water volume and water flow distribution of the river;

[0007] (2) After determining the distribution positions of the bionic islands and bionic berms in the river channel, first place a bionic island group on the uniform river channel section at the river channel entrance. The bionic island group includes the first island unit, the second island unit, the third island unit, and the fourth island unit. When placing them, arrange a row of the first island unit, a row of the second island unit, a row of the third island unit, and a row of the fourth island unit in the direction of the water flow, and ensure that 1 / 2 of the fourth island unit remains above the normal water level.

[0008] (3) Then, bionic island units are selected according to the ecological needs of the river, and the bionic island units are placed in a uniform river section at the river entrance in the direction of water flow; wherein the bionic island unit is one of the first island unit, the second island unit, the third island unit, and the fourth island unit;

[0009] (4) Finally, bionic embankments are placed at intervals along the edges of both sides of the river channel.

[0010] Furthermore, in (2), the number of island units in each row is controlled within a range of 3 to 7.

[0011] Furthermore, in (2), the first island unit, the second island unit, the third island unit and the fourth island unit are

[0012] Little D n and bottom slope Ω n The following formulas are used for calculation:

[0013]

[0014]

[0015] Where,

[0016] n takes values ​​of 1, 2, 3, or 4;

[0017] V is the water velocity at the position 10% of the water depth above the riverbed;

[0018] C1 = 0.2: maintains a low flow rate for ecological purification and keeps plant roots stable; C2 = 0.4: promotes water flow driving for fish migration; C3 = 1.2: locally strengthens the scouring effect of water flow; C4 = 0.7: locally deflects water flow driving;

[0019] α is the slope angle of the water-facing surface at the bottom of the corresponding island unit;

[0020] is the internal friction angle of the water-facing surface at the bottom of the corresponding island unit.

[0021] Furthermore, in (3), the distance between adjacent bionic island monomers is more than 1.5 times the width of the bionic island monomer.

[0022] Furthermore, in (4), locations with landslides, collapses, and unstable foundations are selected to place bionic berms.

[0023] Furthermore, in (4), according to actual needs, the bionic embankment is arranged in a pyramid-shaped stack along the vertical direction.

[0024] The present invention also provides the following technical solution: a river habitat reinforcement structure, applied to the river habitat restoration method, comprising: a bionic island and a plurality of bionic embankments; the bionic island is arranged on a uniform river section at the river entrance, and the plurality of bionic embankments are arranged at intervals on both sides of the river edge.

[0025] Furthermore, the bionic island includes a first island unit, a second island unit, a third island unit and a fourth island unit; the first island unit, the second island unit, the third island unit and the fourth island unit are arranged in rows in sequence to form four rows of bionic island groups with different heights, and the first island unit, the second island unit, the third island unit and the fourth island unit are all hollow structures.

[0026] Furthermore, each of the first island units is provided with a water inlet and a first retention pool is provided on the top. The first retention pool is connected to the water inlet, and the pool wall of the first retention pool is a plant fiber mat.

[0027] Furthermore, first reserved openings are provided on both sides of the widest part of each first island unit.

[0028] Furthermore, each of the second island units is provided with a second reserved opening inside and a first lighting and ventilation opening on the top.

[0029] Furthermore, each of the third island units is provided with a third reserved opening inside and a second lighting and ventilation opening on the top.

[0030] Furthermore, each of the fourth island units is formed by splicing two of the second island units, and each of the fourth island units is provided with a fourth reserved opening inside and a third lighting and ventilation opening on the top.

[0031] Furthermore, second retention pools with different height differences are formed between the first island units in the first row, the second island units in the second row, the third island units in the third row, and the fourth island units in the fourth row.

[0032] Furthermore, a bionic island unit is provided in front of the bionic island group, and the bionic island unit is one of the first island unit, the second island unit, the third island unit, and the fourth island unit.

[0033] Furthermore, the first island unit, the second island unit, the third island unit, the fourth island unit and the bionic embankment together form an artificial wetland micro-topography in the river channel.

[0034] Furthermore, each of the bionic berms is a hollow structure, and a fish inlet is provided at the front end of each of the bionic berms.

[0035] Furthermore, a plurality of partition plates are provided inside each of the bionic berms to divide the interior of the bionic berm into a plurality of spaces, and some of the partition plates are provided with fifth reserved openings.

[0036] Furthermore, an observation port is provided at the lower side of each bionic berm and a hinge anchor is provided at the bottom.

[0037] Compared to existing technologies, the present invention's in-channel habitat reinforcement and restoration method utilizes a first, second, third, and fourth island unit, along with a biomimetic berm, within the channel to create a topographically varied artificial wetland microtopography. This modulates water flow and its interaction with the riverbed rock and soil, creating diverse landforms within the channel and improving hydraulic performance. This enhances the habitat function of fish and other aquatic organisms, increases the diversity of in-channel habitats, and creates varying water depths through varying slopes and grades, enriching habitat diversity and species richness. Furthermore, the first and second retention ponds, along with the artificial wetland microtopography, create a piston-like flow pattern, ensuring a certain residence time for water within the system, allowing pollutants to pass through the biochemical-filtration-sedimentation process, thereby reducing pollutant concentrations. Furthermore, the geometric shape and three-dimensional structure of the first and second retention ponds and the artificial wetland microtopography give the originally straight artificial channel curved edges, or add obstacles to increase habitat heterogeneity, supporting biodiversity and providing rich ecosystem services. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but should not be construed as limiting the present invention.

[0039] Figure 1 : A three-dimensional diagram of the in-river habitat reinforcement structure of the present invention;

[0040] Figure 2 : A top view of the in-river habitat reinforcement structure of the present invention

[0041] Figure 3 : A three-dimensional diagram of the first island unit of the present invention;

[0042] Figure 4 : A three-dimensional diagram of the internal structure of the second island unit of the present invention;

[0043] Figure 5 : A three-dimensional diagram of the third island unit of the present invention;

[0044] Figure 6 : A perspective view of the fourth island unit of the present invention;

[0045] Figure 7 : A schematic structural diagram of the bionic berm of the present invention;

[0046] Figure 8 : A three-dimensional diagram of the internal structure of the bionic berm of the present invention. DETAILED DESCRIPTION

[0047] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0048] like Figure 1 and Figure 2 As shown, the in-channel habitat reinforcement structure of the present invention includes a bionic island and a plurality of bionic berms 1; wherein the bionic island is arranged on a uniform channel section at the channel entrance, and the plurality of bionic berms 1 are arranged at intervals on both side edges of the channel.

[0049] Specifically, the bionic islands include a first island unit 2, a second island unit 3, a third island unit 4, and a fourth island unit 5. These are arranged in rows, forming four staggered rows of bionic islands, thereby increasing and restoring the complexity of the river channel structure and the diversity of hydraulic conditions. Each of these three units is hollow.

[0050] like Figure 3 As shown, the first row is composed of first island units 2, which serve as ecological purification. Each first island unit 2 is equipped with a water inlet 201 to guide and restrict the inflow of river water. A first retention pond 202 is located on the top of each first island unit 2. The first retention pond 202 is connected to the water inlet 201 and is used to grow filtering aquatic plants. It also serves as a breeding ground for benthic animals. Water filtered through the first retention pond 202 enters the interior of the first island unit 2 through the water inlet 201. Furthermore, the walls of the first retention pond 202 are made of plant fiber mats with permeability. Each first island unit 2 is equipped with first reserved openings 203 on both sides of its widest width to allow water, fish, and benthic organisms to enter.

[0051] The size D1 of the first island unit 2 is calculated according to the following formula:

[0052]

[0053] Where,

[0054] V is the water velocity (10% water depth above the riverbed);

[0055] C = 0.3: normal water flow conditions (reference value);

[0056] C1=0.2: Maintain low flow rate for ecological purification and keep plant root system stable;

[0057] Ω1 is the bottom slope of the first island unit 2;

[0058] Ω1 is calculated using the following formula:

[0059]

[0060] Where,

[0061] α is the slope angle of the water-facing surface at the bottom of the first island unit 2;

[0062] φ is the internal friction angle of the water-facing surface at the bottom of the first island unit 2.

[0063] like Figure 4 As shown, the second row of second island units 3 protects fish migration. Each second island unit 3 has a second reserved opening 301 for fish to pass through, and a first light and ventilation opening 302 at the top, which also provides a feeding area for birds. People can also release fish fry through the first light and ventilation opening 302, thereby increasing the biodiversity of the river through human intervention.

[0064] The size D2 of the second island unit 3 is calculated according to the following formula:

[0065]

[0066] Where,

[0067] V is the water velocity (10% water depth above the riverbed);

[0068] C = 0.3, normal water flow conditions (reference value);

[0069] C2 = 0.4, water flow driving fish migration;

[0070] Ω2 is the bottom slope of the second island unit 3;

[0071] Ω2 is calculated using the following formula:

[0072]

[0073] Where,

[0074] α is the slope angle of the water-facing surface at the bottom of the second island unit 3;

[0075] φ is the internal friction angle of the water-facing surface at the bottom of the second island unit 3.

[0076] like Figure 5As shown, the third row comprises third island units 4, which regulate and retain water flow. Each third island unit 4 has a third reserved opening for fish to pass through, and a second light and ventilation opening 401 at the top. By providing these third island units 4, flowing water is directed from high to low, enhancing the localized scouring of the riverbed and forming retention pools and shoals.

[0077] The size D3 of the third island unit 4 is calculated according to the following formula:

[0078]

[0079] Where,

[0080] V is the water velocity (10% water depth above the riverbed);

[0081] C = 0.3, normal water flow conditions (reference value);

[0082] C3=1.2, the scouring effect of water flow is locally enhanced;

[0083] Ω3 is the bottom slope of the third island unit 4;

[0084] Ω3 is calculated using the following formula:

[0085]

[0086] Where,

[0087] α is the slope angle of the water-facing surface at the bottom of the third island unit 4;

[0088] φ is the internal friction angle of the water-facing surface at the bottom of the third island unit 4.

[0089] like Figure 6 As shown, the fourth row is composed of fourth island units 5, which serve to deflect water flow. Each fourth island unit 5 is composed of two second island units 3. Each fourth island unit 5 has a fourth reserved opening for fish to pass through, and a third light and ventilation opening 501 is located in the middle of the top.

[0090] The size D4 of the fourth island unit 5 is calculated according to the following formula:

[0091]

[0092] Where,

[0093] V is the water velocity (10% water depth above the riverbed);

[0094] C = 0.3, normal water flow conditions (reference value);

[0095] C4=0.7, local deflection flow drive;

[0096] Ω4 is the bottom slope of the fourth island unit 5;

[0097] Ω4 is calculated using the following formula:

[0098]

[0099] Where,

[0100] α is the slope angle of the water-facing surface at the bottom of the fourth island unit 5;

[0101] φ is the internal friction angle of the water-facing surface at the bottom of the fourth island unit 5.

[0102] like Figure 1 and Figure 2 As shown, further, second retention ponds 6 with different height differences are formed between the first row of first island units 2, the second row of second island units 3, the third row of third island units 4 and the fourth row of fourth island units 5, which is beneficial to protecting the reproduction and survival of fish and benthic animals with different water depth requirements, and is also beneficial to creating habitats for aquatic plants with different water depth requirements.

[0103] In a preferred embodiment, bionic island units (e.g., first island unit 2, second island unit 3, third island unit 4, or fourth island unit 5) can be added in front of the bionic island cluster. The preceding bionic island unit divides the incoming jet into two parts, and the subsequent bionic island cluster meets and deflects each jet part, causing the incoming jet to spread across the width of the basin. This helps create diverse water depth, bottom sediment, and flow velocity conditions. The bionic island cluster also provides excellent shelter, with the local area behind the bionic island cluster providing a good refuge and resting place for organisms. It also helps form relatively large water depth, bubbles, turbulence, and flow velocity gradients, playing an important role in increasing the diversity of river habitats.

[0104] like Figure 7 and Figure 8 As shown, each bionic berm 1 is hollow, constructed from a flexible material to form a frame-like composite double-layer support structure. A fish entrance 101 is provided at the front end of the bionic berm 1 for fish to enter. Multiple partitions 102 are provided within the bionic berm 1, dividing the interior of the bionic berm 1 into multiple spaces. Some of these partitions 102 are provided with fifth reserved openings 103 for fish to pass through. Furthermore, observation ports 104 are provided on the lower side of the bionic berm 1 for observing the interior of the bionic berm 1. A hinge anchor 105 is provided at the bottom of the bionic berm 1 to facilitate insertion of the bionic berm 1 into the riverbed, ensuring that the bionic berm 1 is securely positioned on both sides of the river.

[0105] like Figure 1 and Figure 2As shown, the first, second, third, and fourth island units 2, 3, 4, and 5, along with the biomimetic berm 1, are arranged within the river channel to form a richly varied artificial wetland microtopography. This modulates water flow and its interaction with the riverbed rock and soil, creating diverse landforms within the river channel and improving hydraulic performance. These include water depth, turbulence and uniformity, deep pools or shallows, etc., thereby enhancing the habitat functions of fish and other aquatic organisms and improving habitat diversity within the river channel. Different slopes and grades create varying water depths, enriching habitat diversity and species richness. Furthermore, the first retention pond 202, the second retention pond 6, and the artificial wetland microtopography together form a piston-like flow, ensuring a certain residence time for water within the system, allowing pollutants to pass through the biochemical-filtration-sedimentation process, thereby reducing pollutant concentrations. Furthermore, the geometric shape and three-dimensional structure of the first and second retention ponds 202, 6, and the artificial wetland microtopography give the originally straight artificial river channel curved edges, or add obstacles to increase habitat heterogeneity, supporting biodiversity and providing rich ecosystem services.

[0106] In this embodiment, the first island unit 2, the second island unit 3, the third island unit 4, the fourth island unit 5 and the bionic embankment 1 are all cross-laminated structures of high-damping magnesium-titanium bionic materials prepared by 3D printing and melt infiltration technology.

[0107] like Figure 1 and Figure 2 In addition, the present invention also provides a method for restoring a river habitat, comprising the following steps:

[0108] (1) The river to be restored is determined based on the river basin scope, hydrological characteristics and water quality treatment requirements of the river to be restored. The distribution position, number and distance between adjacent bionic islands and bionic embankments 1 in the river are determined; among them, the distance between bionic islands is determined according to the water volume and water flow distribution conditions of the river.

[0109] (2) After determining the distribution positions of the bionic islands and bionic berms 1 in the river channel, the bionic island group is placed first. The bionic island group includes the first island unit 2, the second island unit 3, the third island unit 4 and the fourth island unit 5. When placing them, a row of first island units 2, a row of second island units 3, a row of third island units 4 and a row of fourth island units 5 are arranged in sequence along the direction of water flow. It is necessary to ensure that 1 / 2 of the fourth island unit 5 remains above the normal water level.

[0110] In this step, according to the direction of water flow and the actual riverbed, an appropriate fixing method is selected to fix the lower end of the bionic island to the riverbed. The number of island units in each row is controlled within the range of 3 to 7.

[0111] In addition, in this step, the size D of the first island unit 2, the second island unit 3, the third island unit 4 and the fourth island unit 5 is n and bottom slope Ω n The following formulas are used for calculation:

[0112]

[0113]

[0114] Where,

[0115] n takes values ​​of 1, 2, 3, or 4;

[0116] V is the water velocity (10% water depth above the riverbed);

[0117] C = 0.3, normal water flow conditions (reference value);

[0118] C1 = 0.2: maintains a low flow rate for ecological purification and keeps plant roots stable; C2 = 0.4: promotes water flow driving for fish migration; C3 = 1.2: locally strengthens the scouring effect of water flow; C4 = 0.7: locally deflects water flow driving;

[0119] α is the slope angle of the water-facing surface at the bottom of the corresponding island unit;

[0120] is the internal friction angle of the water-facing surface at the bottom of the corresponding island unit.

[0121] (3) Then, bionic island units are selected according to the ecological needs of the river, and the bionic island units are placed in the uniform river section at the river entrance in the direction of water flow; wherein the bionic island unit is one of the first island unit 2, the second island unit 3, the third island unit 4 and the fourth island unit 5.

[0122] In this step, the distance between adjacent bionic island monomers is more than 1.5 times the width of the bionic island monomers.

[0123] (4) Finally, bionic embankments 1 are placed at intervals along the edges of both sides of the river channel; among them, bionic embankments 1 are preferably placed at locations with landslides, collapses, or unstable foundations. According to actual needs, bionic embankments 1 can be arranged in a pyramid-like stacking pattern along the vertical direction.

[0124] In summary, the in-river habitat reinforcement structure and restoration method of the present invention have the following advantages:

[0125] 1. By setting up biomimetic islands in the river channel, the inflow of river water can be deflected and the circulation pattern in the treatment wetlands and detention ponds can be improved, while increasing habitat heterogeneity to support biodiversity, thereby providing ecosystem services.

[0126] 2. By setting up a bionic berm 1 in the river channel, the rectangular waterway is effectively avoided, a curved edge is created, and the function of providing multiple habitats is enhanced. At the same time, a bionic structure with the functions of slope protection, shelter, and flow diversion is constructed.

[0127] 3. The first and second retention ponds 202 and 6, along with the constructed wetland microtopography, create a plug-flow system. This allows water to retain a certain amount of time within the system, allowing pollutants to pass through the biochemical, filtration, and sedimentation processes, thereby reducing pollutant concentrations and achieving optimal pollutant degradation. Furthermore, the geometric shape and three-dimensional structure of the first and second retention ponds 202 and 6, as well as the constructed wetland microtopography, create curved edges in the originally straight artificial river channel, or increase habitat heterogeneity by adding obstacles, thereby supporting biodiversity and providing a richer ecosystem service.

[0128] 4. By setting up the first island unit 2 with different structures in the river channel, it plays a role in ecological purification, and the second island unit 3 plays a role in protecting fish migration, thereby meeting the fish migration needs and maintaining the diversity of the ecosystem; the third island unit 4 plays a role in regulating and retaining water flow, and the fourth island unit 5 plays a role in deflecting water flow, enhancing local scouring, adjusting the pattern of sediment scouring and deposition, and rebuilding the shoal.

[0129] As long as it does not violate the creative ideas of the present invention, any combination of various different embodiments of the present invention should be regarded as the content disclosed by the present invention; within the technical concept of the present invention, any simple modifications of the technical solution and any combination of different embodiments that do not violate the creative ideas of the present invention should be within the protection scope of the present invention.

Claims

1. A method for restoring in-river habitats, characterized in that: The following steps are involved: (1) The river to be restored shall be determined based on the river basin scope, hydrological characteristics and water quality treatment requirements of the river to be restored, and the distribution location, number and distance between adjacent bionic islands and bionic embankments in the river shall be determined; the distance between bionic islands shall be determined based on the water volume and water flow distribution of the river; (2) After determining the distribution positions of the bionic islands and bionic berms in the river channel, first place a bionic island group on the uniform river channel section at the river channel entrance. The bionic island group includes the first island unit, the second island unit, the third island unit, and the fourth island unit. When placing them, arrange a row of the first island unit, a row of the second island unit, a row of the third island unit, and a row of the fourth island unit in the direction of the water flow, and ensure that 1 / 2 of the fourth island unit remains above the normal water level. (3) Then, bionic island units are selected according to the ecological needs of the river, and the bionic island units are placed in a uniform river section at the river entrance in the direction of water flow; wherein the bionic island unit is one of the first island unit, the second island unit, the third island unit, and the fourth island unit; (4) Finally, bionic embankments are placed at intervals along the edges of both sides of the river channel.

2. The method for restoring in-river habitats according to claim 1, wherein: In (2), the number of island units in each row is controlled within the range of 3 to 7.

3. The method for restoring in-river habitats according to claim 1, wherein: In (2), the sizes D of the first island unit, the second island unit, the third island unit, and the fourth island unit are n and bottom slope Ω n The following formulas are used for calculation: Where, n takes values ​​of 1, 2, 3, or 4; V is the water velocity at the position 10% of the water depth above the riverbed; C1 = 0.2: maintains a low flow rate for ecological purification and keeps plant roots stable; C2 = 0.4: promotes water flow driving for fish migration; C3 = 1.2: locally strengthens the scouring effect of water flow; C4 = 0.7: locally deflects water flow driving; α is the slope angle of the water-facing surface at the bottom of the corresponding island unit; is the internal friction angle of the water-facing surface at the bottom of the corresponding island unit.

4. The method for restoring in-river habitats according to claim 1, wherein: In (3), the distance between adjacent bionic island monomers is more than 1.5 times the width of the bionic island monomer.

5. The method for restoring in-river habitats according to claim 1, wherein: In (4), locations with landslides, collapses, and unstable foundations are selected to place bionic embankments.

6. The method for restoring in-river habitats according to claim 1, wherein: In (4), according to actual needs, the bionic embankment is arranged in a pyramid-shaped stack along the vertical direction.

7. A river habitat reinforcement structure, applied to the river habitat restoration method according to any one of claims 1 to 6, comprising: bionic islands and multiple bionic berms; The bionic island is arranged on a uniform river channel section at the river channel entrance, and a plurality of bionic embankments are arranged at intervals on both side edges of the river channel.

8. The in-river habitat reinforcement structure according to claim 7, characterized in that: The bionic island includes a first island unit, a second island unit, a third island unit and a fourth island unit; the first island unit, the second island unit, the third island unit and the fourth island unit are arranged in rows in sequence to form four rows of bionic island groups with different heights, and the first island unit, the second island unit, the third island unit and the fourth island unit are all hollow structures.

9. The in-river habitat reinforcement structure according to claim 8, characterized in that: Each of the first island units is provided with a water inlet and a first retention pool is provided on the top. The first retention pool is connected to the water inlet, and the pool wall of the first retention pool is a plant fiber mat.

10. The in-river habitat reinforcement structure according to claim 9, characterized in that: Each of the first island units is provided with first reserved openings on both sides of its widest side.

11. The in-river habitat reinforcement structure according to claim 8, characterized in that: Each of the second island units is provided with a second reserved opening inside and a first lighting and ventilation opening on the top.

12. The in-channel habitat reinforcement structure according to claim 8, wherein: Each of the third island units is provided with a third reserved opening inside and a second lighting and ventilation opening on the top.

13. The in-channel habitat reinforcement structure according to claim 8, characterized in that: Each of the fourth island units is formed by splicing two of the second island units, and each of the fourth island units is provided with a fourth reserved opening inside and a third lighting and ventilation opening on the top.

14. The in-channel habitat reinforcement structure according to claim 8, wherein: Second retention pools with different height differences are formed between the first island units in the first row, the second island units in the second row, the third island units in the third row, and the fourth island units in the fourth row.

15. The in-channel habitat reinforcement structure according to claim 8, characterized in that: A bionic island unit is provided in front of the bionic island group, and the bionic island unit is one of the first island unit, the second island unit, the third island unit and the fourth island unit.

16. The in-channel habitat reinforcement structure according to claim 8, characterized in that: The first island unit, the second island unit, the third island unit, the fourth island unit and the bionic berm jointly form an artificial wetland micro-topography in the river channel.

17. The in-channel habitat reinforcement structure according to claim 7, wherein: Each of the bionic berms is a hollow structure, and a fish inlet is provided at the front end of each of the bionic berms.

18. The in-channel habitat reinforcement structure according to claim 7, wherein: A plurality of partition plates are provided inside each of the bionic berms to divide the interior of the bionic berm into a plurality of spaces, and some of the partition plates are provided with fifth reserved openings.

19. The in-channel habitat reinforcement structure according to claim 7, wherein: An observation port is provided below the side of each bionic berm and a hinge anchor is provided at the bottom.

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