Riprap anti-scouring composite structure based on bionic technology and construction method

Abstract

The invention discloses a riprap anti-scouring composite structure based on a bionic process and a construction method, and relates to the field of wind power pile foundation protection. The composite structure comprises a bionic net bag riprap body and a base net bag riprap body. A layered composite protection structure is formed by a bionic net bag riprap body and a base net bag riprap body, gravel particles in the bionic net bag riprap body are restrained through a bionic net bag, and gravel particles in the base net bag riprap body are restrained through a base net bag, so that stone displacement and loss caused by water flow scouring are prevented, and the problem that common riprap is prone to displacement is solved; the anti-scouring stability of the structure is improved; the bionic aquatic plant blades are utilized to consume water flow energy through flexible swing, sediment is promoted to deposit around the pile foundation, a scouring pit is covered, and long-term siltation promotion and self-maintenance are formed. Rigid support is provided through the bottom layer riprap body, flexible energy dissipation is provided through the upper surface layer aquatic plants, the rigid support and the upper surface layer aquatic plants are layered and compounded to form a rigid-flexible protection system, the purpose of structure synergistic interaction is achieved, and the dual functions of anti-scouring and siltation promotion are reasonably considered.

Description

Technical Field

[0001] The present invention relates to the field of wind power pile foundation protection, and in particular to a bionic process-based riprap anti-scour composite structure and a construction method. Background Art

[0002] Wind turbine pile foundations, the key supporting structures for offshore wind turbines, are subject to scouring from natural factors such as waves, tides, and currents. This can cause sediment loss around the wind turbine pile foundations, forming scour pits. If these scour pits continue to deepen and expand, the pile foundation's depth into the mud will decrease, reducing its lateral friction and vertical bearing capacity. In severe cases, this can lead to pile instability. Therefore, protective mechanisms are necessary to prevent scour from damaging the effective operating environment of wind turbine pile foundations.

[0003] In the relevant technology, riprap protection and aquatic grass protection can be used to establish a protection mechanism for wind turbine pile foundations. For riprap protection, under the long-term action of water currents such as waves and tides, the stones in the riprap layer are prone to displacement and scattering, resulting in the destruction of the integrity of the protective layer. It cannot effectively cover the area around the pile foundation, thus losing its protective effect and may also cause secondary scouring; and with the passage of time and the continuous changes in the marine environment, the performance of the riprap layer will gradually decline. For example, the mutual abrasion between stones will make the stones smaller and the porosity will increase, thereby reducing the stability and scouring resistance of the protective layer, requiring frequent maintenance and replenishment of riprap. As for aquatic plant protection, bionic aquatic plant protection has certain requirements for water flow conditions and seabed substrate. In sea areas with fast water flow and small sand particle size, the damping effect of bionic aquatic plants is difficult to effectively promote sedimentation, and cannot form a sufficiently thick sediment cover layer to protect the pile foundation, and may even be damaged by water erosion. Once the aquatic plant protection is installed underwater, if it is damaged or its performance degrades, it is difficult to repair and replace it, and professional divers and equipment are required to operate it. Not only is the cost high, but the operation risk is also relatively high, and actual maintenance and management are difficult.

[0004] Therefore, conventional riprap protection is easily displaced by water flow, requiring frequent stone replenishment and maintenance. It relies solely on the gaps between the stones to slow down the flow, resulting in limited siltation reduction. Conventional aquatic weed protection lacks rigid support and has weak resistance to direct scouring. Laying it alone is complex and costly.

[0005] The above method cannot establish a long-term stable anti-scour structure, has high operation and maintenance costs, and is difficult to balance construction feasibility and adaptability to the marine environment to meet the protection needs of offshore wind turbine pile foundations. Summary of the Invention

[0006] In view of this, the present invention provides a riprap anti-scour composite structure and a construction method based on bionic technology to solve the problems raised by the above background technology.

[0007] In a first aspect, the present invention provides a riprap anti-scour composite structure based on bionic technology, comprising:

[0008] A bionic net bag riprap body comprises a bionic net bag and a plurality of gravel particles wrapped in the bionic net bag, wherein the outer surface of the bionic net bag riprap body is fixedly paved with a plurality of bionic water grass blades;

[0009] A base net bag riprap body comprises a base net bag and a plurality of gravel particles wrapped in the base net bag, wherein the base net bag riprap body is suitable for being arranged around the bottom periphery of an offshore wind power pile foundation;

[0010] The bionic net bag riprap body is covered and arranged above the axial direction of the base net bag riprap body, and a plurality of the base net bag riprap bodies and a plurality of the bionic net bag riprap bodies together form a layered composite protective structure.

[0011] Beneficial effects: A layered composite protective structure is formed by the bionic net bag riprap and the base net bag riprap. The bionic net bag riprap restrains the gravel particles within it through the bionic net bag, while the base net bag riprap restrains the gravel particles within it through the base net bag, preventing the displacement and loss of stones caused by water scouring. This solves the problem of easy displacement of conventional riprap and improves the stability of the structure against scouring. The bionic water grass blades on the upper surface flexibly swing to consume water energy, reducing direct scouring force and compensating for the lack of rigidity of pure water grass protection. The bionic water grass blades stop and slow down the water flow, promoting sediment deposition around the pile foundation, covering the scouring pit, and forming a long-term siltation-promoting and self-maintaining structure. Sediment deposition fills the gaps between the riprap bodies within the layered composite protective structure, forming a more stable overall protective structure and reducing maintenance requirements. The composite structure provided by the present invention has the bottom riprap body providing rigid support and the upper surface water grass providing flexible energy dissipation. The two are layered and combined to form a rigid-flexible protective system, achieving the purpose of structural synergy and rationally balancing the dual functions of anti-scouring and siltation.

[0012] In some embodiments, the composite structure is divided into the following parts from the inside out along the axial direction of the offshore wind turbine pile foundation:

[0013] a base area, consisting of the base net bag riprap, the base area accounting for more than 50% of the total volume of the composite structure;

[0014] The bionic seagrass area is composed of the bionic net bag riprap body, and the bionic seagrass area is distributed on the surface of the composite structure.

[0015] Beneficial Effects: Setting the base area to account for more than 50% of the composite structure's volume, the base area dominates, ensuring the composite structure's center of gravity is lowered, optimizing load distribution, enhancing anti-overturning capabilities, and resisting wave impacts. The small-volume bionic aquatic plant area on the surface focuses on promoting siltation and energy dissipation, reducing material usage and overall costs. In this solution, the large-volume riprap on the bottom layer is filled with low-cost gravel, providing primary stability. The bionic aquatic plant blades buffer water flow, promote siltation, and enhance overall anti-scour capabilities. The layered design clarifies the functions of each area and complements each other, optimizing the layout of the protective structure and improving its efficiency and adaptability.

[0016] In some embodiments, the bionic aquatic plant blades are made of flexible polymer materials that have been treated with UV protection.

[0017] Beneficial effects: Anti-ultraviolet treatment delays the aging and brittleness of polymer materials under strong ocean sunlight, avoids blade breakage and failure, and extends the service life of bionic water grass blades; the flexible material ensures that the blades continue to dissipate energy as they swing with the water flow, maintains flexible function, and maintains the silt-promoting effect.

[0018] In some embodiments, the bottom of the bionic water grass blade is bonded and fixed to the gravel particles in the bionic net bag through a gelling material, and the bionic water grass blade partially extends to the outside of the bionic net bag.

[0019] Beneficial effect: The blades of the bionic water grass are bonded to the gravel particles through the cementitious material. The cementitious material can penetrate the gaps between the gravel to form an overall bond, thus preventing the blades from being torn off by the water flow and improving the anchoring reliability.

[0020] In some embodiments, the cementitious material is Portland cement or phosphate cement.

[0021] Beneficial effects: After hardening in a seawater environment, silicate / phosphate cement is resistant to chemical erosion and can withstand the corrosion of the marine environment, ensuring long-term and effective anchoring strength between the bionic water grass blades and the gravel particles.

[0022] In some embodiments, the length of the bionic aquatic plant blades is 0.5m to 2m.

[0023] Beneficial effects: The length of the bionic water grass blades is limited to 0.5-2m to match the requirements of hydrodynamics. If the length of the bionic water grass blades is less than 0.5m, there is a risk of insufficient energy dissipation effect. If the length of the bionic water grass blades is greater than 2m, they are easily entangled and damaged with each other, and the expected flexible energy dissipation and sedimentation-promoting effect cannot be achieved. In addition, limiting the length can prevent the blades from entangled with the equipment during lifting, avoid construction risks, and improve construction safety.

[0024] In some embodiments, the length of the bionic aquatic plant blades is 0.625m to 1.875m.

[0025] Beneficial effects: The bionic water grass blades are 0.625-1.875m in length, which can adapt to match the wavelength of common waves and maximize the turbulent energy dissipation efficiency.

[0026] In some embodiments, the particle size of the gravel particles in the base net bag is larger than the particle size of the gravel particles in the bionic net bag.

[0027] Beneficial effects: The large-size gravel in the bottom layer resists the impact of high-speed water flow, and the small-size gravel on the surface fills the gaps to enhance density, forming a graded anti-scour design to better protect the wind turbine pile foundation.

[0028] In some embodiments, the base mesh bag and the biomimetic mesh bag are corrosion-resistant polymer woven meshes.

[0029] Beneficial effect: The corrosion-resistant polymer net bag can effectively resist seawater salt corrosion and avoid the net bag damage leading to structural disintegration.

[0030] In a second aspect, the present invention provides a construction method of a riprap anti-scour composite structure based on a bionic process, comprising the following steps:

[0031] The base net bag riprap is transported to the bottom of the offshore wind turbine pile foundation through a delivery pipe or a crane and piled around the perimeter;

[0032] The bionic net bag riprap is piled on the upper layer of the base net bag riprap by using a dropping pipe or a crane;

[0033] A layered composite protective structure is formed by a plurality of base net bag riprap bodies and a plurality of bionic net bag riprap bodies.

[0034] Beneficial effects: A composite structure is formed by stacking the base net bag riprap and the bionic net bag riprap in layers. The base area riprap is precisely positioned by the delivery tube to avoid underwater manual operation. The crane quickly lays the large-volume bottom layer, and the construction process is efficient and accurate. The order of bottom layer first and then surface layer ensures that the base stably supports the upper bionic aquatic plant area, prevents crushing and deformation, and ensures the integrity of the structure.

[0035] In some embodiments, when a crane is used to drop the bionic net bag riprap, the falling speed of the bionic net bag riprap is controlled so that the bionic water grass blades can be suspended in the seawater.

[0036] Beneficial effect: By falling at a low speed, the bionic water grass blades can be suspended and spread out, avoiding bending and breaking when stacked, so as to ensure the energy dissipation and sedimentation-promoting function of the bionic water grass blades.

[0037] In some embodiments, when the bionic net bag riprap is released using a release tube, the landing point of the bionic net bag riprap is directionally adjusted so that the bionic aquatic plant blades are not buried under the bionic net bag riprap.

[0038] Beneficial effect: Through directional landing, the bionic water grass blades are ensured to be exposed to the water flow upward, giving full play to the energy dissipation and sedimentation promotion effect, and avoiding burial failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 Schematic diagram of a riprap anti-scour composite structure based on bionic technology according to an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of a bionic water grass blade according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the bonding point of the bionic water grass blades according to an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of a bionic net bag riprap according to an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 1. Base net bag riprap; 2. Bionic net bag riprap; 3. Offshore wind power pile foundation; 4. Bionic aquatic grass blades; 5. Cementitious material. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0047] The following combination Figures 1 to 4 , describing embodiments of the present invention.

[0048] According to an embodiment of the present invention, on the one hand, a riprap anti-scour composite structure based on bionic technology is provided, including a bionic net bag riprap body 2 and a base net bag riprap body 1. The base net bag riprap body 1 is suitable for being arranged around the bottom peripheral side of an offshore wind power pile foundation 3, and the bionic net bag riprap body 2 is covered and arranged axially above the base net bag riprap body 1. Multiple base net bag riprap bodies 1 and multiple bionic net bag riprap bodies 2 together form a layered composite protective structure.

[0049] Specifically, the bionic net bag riprap body 2 includes a bionic net bag and a plurality of gravel particles wrapped in the bionic net bag. The outer surface of the bionic net bag riprap body 2 is fixedly paved with a plurality of bionic water grass blades 4.

[0050] Specifically, the base net bag riprap body 1 includes a base net bag and a plurality of gravel particles wrapped in the base net bag.

[0051] The composite structure provided in this embodiment comprises a bionic mesh riprap 2 and a base mesh riprap 1, forming a layered composite protective structure. The bionic mesh riprap 2 constrains the gravel particles within it through the bionic mesh, while the base mesh riprap 1 constrains the gravel particles within it through the base mesh. This prevents the displacement of stones caused by water scouring, thereby resolving the problem of easy displacement of conventional riprap and improving the structural stability against scouring. This application utilizes bionic waterweed blades 4 on the upper surface to consume water energy through flexible swinging, reducing direct scouring forces and compensating for the lack of rigidity of pure waterweed protection. The bionic waterweed blades 4 block the water flow and decelerate it, promoting sediment deposition around the pile foundation, covering the scouring pit, and forming a long-term sedimentation-promoting and self-maintaining structure. Sediment deposition fills the gaps between the riprap bodies within the layered composite protective structure, forming a more stable overall protective structure and reducing maintenance requirements.

[0052] The composite structure provided by the present invention comprises a bottom layer of riprap that provides rigid support, and an upper layer of aquatic plants that provides flexible energy dissipation. The two are layered and composited to form a rigid-flexible protection system, thereby achieving the purpose of structural synergy and reasonably taking into account the dual functions of anti-scouring and promoting siltation.

[0053] In a specific embodiment, the composite structure is divided into a base area and a bionic seagrass area from the inside to the outside along the axial direction of the offshore wind turbine pile foundation 3 .

[0054] Specifically, the base area is composed of base net bag riprap 1, and the base area accounts for more than 50% of the total volume of the composite structure; the bionic seagrass area is composed of bionic net bag riprap 2, and the bionic seagrass area is distributed on the surface of the composite structure.

[0055] Through the above scheme, the base area is set to account for more than 50%. For composite structures, the base area dominates the volume, which helps to ensure the composite structure's center of gravity is shifted downward, optimize load distribution, enhance anti-overturning capabilities, and resist wave impact. The small-volume bionic water grass area on the surface focuses on promoting siltation and energy dissipation, reducing material usage and overall costs. In this scheme, the large-volume riprap on the bottom layer is filled with low-cost gravel, providing primary stability. The four bionic water grass blades buffer water flow, promote siltation, and enhance overall anti-scour capabilities. The layered design ensures that the functions of each area are clear and complementary, optimizing the layout of the protective structure and improving its efficiency and adaptability.

[0056] Preferably, the height of the base area accounts for 60%-70% of the height of the composite structure, and the height of the bionic seagrass area accounts for 30%-40%. The bionic area is lightweight to reduce material costs.

[0057] In this embodiment, the bionic seagrass area is completely covered on the base area, and along the radial direction of the pile foundation, the construction area of ​​the bionic seagrass area is larger than the construction area of ​​the base area.

[0058] In some embodiments, the particle size of the gravel particles in the base net bag is larger than the particle size of the gravel particles in the bionic net bag.

[0059] Specifically, for example, the particle size of the gravel particles in the base net bag is 15-30 cm; the particle size of the gravel particles in the bionic net bag is 5-10 cm.

[0060] Through the above scheme, the large-grained gravel in the bottom layer resists the impact of high-speed water flow, and the small-grained gravel on the surface fills the gaps to enhance density, forming a graded anti-scour design to better protect the wind turbine pile foundation.

[0061] In some embodiments, the base mesh and the biomimetic mesh are corrosion-resistant polymer woven meshes.

[0062] Through the above solution, the mesh bag made of corrosion-resistant polymer can effectively resist seawater salt corrosion and avoid the structural disintegration caused by damage to the mesh bag.

[0063] Specifically, the corrosion-resistant polymer may be polyester or polyethylene.

[0064] For the base net bag and the bionic net bag, the mesh aperture is 0.4-0.6 times the minimum particle size of the gravel therein; the tensile strength of the net bag is ≥50kN / m, and the elongation at break is ≤15%.

[0065] Regarding the design of materials and structure of the bionic water grass blade 4:

[0066] In some embodiments, the bionic waterweed blades 4 are made of a flexible polymer material that has been treated with UV protection. This treatment slows down the aging and embrittlement of the polymer material under strong ocean sunlight, preventing the blades from breaking and failing, thereby extending the service life of the bionic waterweed blades 4. The flexible material ensures that the blades continuously dissipate energy as they sway with the water flow, maintaining their flexibility and promoting their siltation-promoting effect.

[0067] In some embodiments, the bottom of the bionic waterweed blade 4 is bonded to the gravel particles within the bionic net bag via a cementitious material 5, and the bionic waterweed blade 4 partially extends outside the bionic net bag. The cementitious material 5 allows the bionic waterweed blade 4 to be bonded to the gravel particles, penetrating the gaps between the gravel to form a solid bond, preventing the blade from being torn apart by water flow and improving anchoring reliability.

[0068] In some embodiments, the cementitious material 5 is silicate cement or phosphate cement. After hardening in a seawater environment, silicate / phosphate cement is resistant to chemical erosion and can withstand the corrosion of the marine environment, ensuring long-term and effective anchoring strength between the bionic water grass blades 4 and the gravel particles.

[0069] In some embodiments, the length of the bionic water grass blades 4 is 0.5m to 2m. Limiting the length range of the bionic water grass blades 4 to 0.5-2m is to match the requirements of hydrodynamics. If the bionic water grass blades 4 are less than 0.5m, they are prone to insufficient energy dissipation. If the bionic water grass blades 4 are longer than 2m, they are easily entangled and damaged, failing to achieve the desired flexible energy dissipation and sedimentation-promoting effect. Furthermore, limiting the length prevents the blades from entanglement with equipment during hoisting, avoiding construction risks and improving construction safety.

[0070] In some embodiments, the length of the bionic water grass blades 4 is 0.625m to 1.875m. The length of the bionic water grass blades 4 is 0.625-1.875m, which can adapt to match the wavelength of common waves and maximize the turbulent energy dissipation efficiency.

[0071] In some embodiments, the thickness of the bionic water grass blades 4 is set to 1.5 mm-3 mm.

[0072] According to an embodiment of the present invention, on the other hand, a construction method of a riprap anti-scour composite structure based on a bionic process is provided, comprising the following steps:

[0073] S1: The base net bag riprap 1 is transported to the bottom of the offshore wind power pile foundation 3 by a delivery pipe or a crane and piled around the periphery;

[0074] S2: stacking the bionic net bag riprap 2 on the upper layer of the base net bag riprap 1 through a delivery pipe or a crane;

[0075] A layered composite protective structure is formed by a plurality of base net bag riprap bodies 1 and a plurality of bionic net bag riprap bodies 2.

[0076] This construction method adopts the method of stacking the base net bag riprap 1 and the bionic net bag riprap 2 in layers in sequence to form a composite structure. Specifically, the base area riprap is accurately positioned by the delivery pipe to avoid underwater manual operation; the crane quickly lays the large volume of the bottom layer, and the construction process is efficient and accurate; the order of the bottom layer first and then the surface layer ensures that the base stably supports the upper bionic aquatic plant area, prevents crushing and deformation, and ensures the integrity of the structure.

[0077] In some embodiments, when the bionic net bag riprap 2 is dropped by a crane, the falling speed of the bionic net bag riprap 2 is controlled so that the bionic water grass blades 4 can be suspended in the seawater. For example, the falling speed of the bionic net bag riprap 2 is controlled to be ≤0.5 m / s.

[0078] Through the above scheme, the bionic water grass blades 4 can be suspended and unfolded by falling at a low speed, avoiding bending and breaking when stacking, so as to ensure the energy dissipation and sedimentation-promoting function of the bionic water grass blades 4.

[0079] In some embodiments, when the bionic net bag riprap 2 is released using a release tube, the landing point of the bionic net bag riprap 2 is directionally adjusted so that the bionic aquatic grass blades 4 are not buried under the bionic net bag riprap 2 .

[0080] Through the above scheme, the bionic water grass blades 4 are ensured to be exposed to the water flow upwards through the directional landing point, so as to give full play to the energy dissipation and sedimentation promoting effect and avoid burial failure.

[0081] The construction method provided in this embodiment has low material cost and is easy to construct. The overall construction method is the same as the traditional riprap method, and the requirements for construction vessels and equipment are not high. In addition, the construction is convenient and the construction period is short. The combination of riprap and bionic aquatic plants can effectively reduce the manufacturing cost and operation and maintenance cost of offshore wind power foundation anti-scour.

[0082] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A riprap anti-scour composite structure based on bionic technology, characterized in that: include: A bionic net bag riprap body (2) comprises a bionic net bag and a plurality of gravel particles wrapped in the bionic net bag, wherein the outer surface of the bionic net bag riprap body (2) is fixedly paved with a plurality of bionic water grass blades (4); A base net bag riprap body (1) comprises a base net bag and a plurality of crushed stone particles wrapped in the base net bag, wherein the base net bag riprap body (1) is suitable for being arranged around the bottom peripheral side of an offshore wind power pile foundation (3); The bionic net bag riprap body (2) is arranged to cover the axial upper part of the base net bag riprap body (1), and a plurality of the base net bag riprap bodies (1) and a plurality of the bionic net bag riprap bodies (2) together form a layered composite protective structure.

2. The bionic process-based riprap anti-scour composite structure according to claim 1 is characterized in that: The composite structure is divided into the following parts from the inside to the outside along the axial direction of the offshore wind power pile foundation (3): A base area, consisting of the base net bag riprap body (1), the base area accounting for more than 50% of the total volume of the composite structure; The bionic seaweed area is composed of the bionic net bag riprap body (2), and the bionic seaweed area is distributed on the surface of the composite structure.

3. The bionic process-based riprap anti-scour composite structure according to claim 1 is characterized in that: The bionic water grass blades (4) are made of flexible polymer materials that have been treated with UV rays.

4. The bionic process-based riprap anti-scour composite structure according to claim 1 is characterized in that: The bottom of the bionic water grass blade (4) is bonded and fixed to the gravel particles in the bionic net bag through a gelling material (5), and the bionic water grass blade (4) partially extends to the outside of the bionic net bag.

5. The bionic process-based riprap anti-scour composite structure according to claim 4 is characterized in that: The cementitious material (5) is silicate cement or phosphate cement.

6. The bionic process-based riprap anti-scour composite structure according to claim 1 is characterized in that: The length of the bionic water grass blades (4) is 0.5m to 2m.

7. The bionic process-based riprap anti-scour composite structure according to claim 6 is characterized in that: The length of the bionic water grass blade (4) is 0.625m to 1.875m.

8. The bionic process-based riprap anti-scour composite structure according to claim 1 is characterized in that: The particle size of the gravel particles in the base net bag is larger than the particle size of the gravel particles in the bionic net bag; and / or; The base net bag and the bionic net bag are corrosion-resistant polymer woven nets.

9. A construction method of a riprap anti-scour composite structure based on bionic technology according to any one of claims 1 to 8, characterized in that: The following steps are involved: The base net bag riprap (1) is transported to the bottom of the offshore wind power pile foundation (3) through a delivery pipe or a crane and is piled around the periphery; The bionic net bag riprap body (2) is stacked on the upper layer of the base net bag riprap body (1) through a delivery pipe or a crane; A layered composite protective structure is formed by a plurality of base net bag riprap bodies (1) and a plurality of bionic net bag riprap bodies (2).

10. The construction method according to claim 9, characterized in that: When using a crane to drop the bionic net bag riprap, controlling the falling speed of the bionic net bag riprap so that the bionic water grass blades (4) can be suspended in the seawater; and / or; When the bionic net bag riprap body (2) is released using a release tube, the landing point orientation of the bionic net bag riprap body (2) is directionally adjusted so that the bionic water grass blades (4) are not buried under the bionic net bag riprap body (2).

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