Auxiliary structure for shallow sea ecological restoration and restoration system construction method

Abstract

The present invention provides an auxiliary structure for beach and shallow sea ecological restoration and a method for constructing a restoration system, which belongs to the technical field of water conservancy engineering for beach and shallow sea ecological restoration; the auxiliary structure includes a combined permeable submerged dike structure, a natural wave-breaking combined pile body and an oyster cultivation mesh structure; the combined permeable submerged dike structure includes a hexagonal hollow prism and an isosceles trapezoidal hollow prism, and the two prisms are in a staggered stacking structure, providing a natural shelter for small marine organisms; the natural wave-breaking combined pile body penetrates the combined permeable submerged dike structure through the upper and lower openings of the prism body, forming an effective support and fixation for the combined permeable submerged dike structure; the oyster cultivation mesh structure is fixed to the natural wave-breaking combined pile body, and its design meets the filter-feeding environment of oyster cultivation. The restoration system is designed accordingly based on the auxiliary structure and the on-site environment. The structure of the present invention is simple, the raw materials are easy to obtain, the protective engineering is organically combined with the oyster reef body, and it is ecologically friendly and does not require subsequent artificial treatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of water conservancy engineering for beach and shallow sea ecological restoration, and in particular relates to an auxiliary structure for beach and shallow sea ecological restoration and a restoration system construction method. Background Art

[0002] Shallow seas, located in the transition zone between land and sea, are a vital component of ecosystems, playing an irreplaceable role in carbon sequestration, climate regulation, biodiversity, and maintaining ecosystem stability. Against the backdrop of frequent storm surges and accelerated sea level rise caused by global warming, the global area of ​​shallow seas has lost as much as 50% over the last century. This rapid loss has jeopardized critical functions and ecosystem services, necessitating urgent ecological restoration of shallow seas.

[0003] Traditional shoal and shallow sea restoration methods mostly rely on submerged dikes, which block hydrological connectivity, reduce sediment replenishment in the wetlands behind, and have poor adaptability to muddy coasts. Wave-breaking measures designed to provide a favorable environment for ecological restoration often use concrete pipe piles. Their hard surface inhibits the attachment of shellfish larvae, but concrete pipe piles are limited in function and can easily cause ecological damage. Oyster reef restoration is often isolated, mostly using artificial reefs without integrated protective engineering.

[0004] Most of the existing auxiliary methods for shallow sea ecological restoration are based on changing hydrological conditions and lack the "hydrological-ecological" synergistic efficiency enhancement function. Summary of the Invention

[0005] In response to the above problems, the present invention proposes an auxiliary structure for shallow sea ecological restoration and a restoration system construction method to solve the problems mentioned in the above background.

[0006] The first aspect of the present invention provides an auxiliary structure for beach and shallow sea ecological restoration, comprising a combined air-permeable submerged dike structure, a natural wave-breaking combined pile body, and an oyster cultivation net structure;

[0007] The combined permeable submerged dike structure includes several groups of hexagonal hollow prisms and corresponding isosceles trapezoidal hollow prisms; the hexagonal hollow prisms and isosceles trapezoidal hollow prisms are in an interlaced stacking structure and have equal column heights; the lengths of the six sides of the hexagonal hollow prisms are equal to the waist length and upper side length of the isosceles trapezoidal hollow prisms; the sides of both prisms are provided with a number of corresponding openings of appropriate number and size, the aperture size of which is sufficient to effectively pass tidal currents, sediment, and small marine organisms;

[0008] The natural wave-breaking composite piles are made of natural materials and are provided in multiple groups. They penetrate the combined permeable submerged dike structure through the upper and lower openings of the prism, effectively supporting and fixing the combined permeable submerged dike structure. The diameter of the piles is adapted to the size of the prism openings for easy fixation. The bottom of the combined piles is inserted into the seabed mud.

[0009] The oyster cultivation net structure is fixed horizontally and tilted above the combined permeable submerged dike structure by natural wave-breaking combined piles, and its shape and size are adapted to the stacking structure of the combined permeable submerged dike structure; when the oyster larvae are cultivated to a certain extent, the oyster cultivation net structure can fall off naturally or be covered on the combined permeable submerged dike structure through artificial falling off.

[0010] Preferably, in the combined permeable submerged dike structure, at least three groups of hexagonal hollow prisms and isosceles trapezoidal hollow prisms are provided, the staggered stacking structure has the center position as the highest height, and the two sides are symmetrically stacked, and isosceles trapezoidal hollow prisms are provided on the innermost and outermost sides for fixation.

[0011] Preferably, the natural wave-breaking composite pile body is made of natural wood, the diameter of the bundled combination is adapted to the size of the prism opening, the bottom is inserted into the seabed mud by sharpening, the openings of the two prisms are evenly spaced, and three-stage reinforcement treatment is performed at the top, middle and bottom of the composite pile body.

[0012] Preferably, the oyster cultivation net structure is made of degradable material braided ropes fully soaked in oyster shell powder suspension and then woven alternately into a net, and knots are provided at each corner to facilitate fixation to the natural wave-breaking combined pile body to meet the filter-feeding environment of oyster cultivation.

[0013] Preferably, the side thickness of the hexagonal hollow prism (11) and the isosceles trapezoidal hollow prism (12) should be no less than 0.2 times the side length.

[0014] The second aspect of the present invention provides a method for constructing a shallow sea ecological restoration system, using the auxiliary structure described in the first aspect, and comprising the following steps:

[0015] S1. Determine the water depth for placement of auxiliary structures and the height of staggered stacking of combined submerged dike structures based on the tidal range in the shallow sea ecological restoration area;

[0016] S2, determine the placement width of auxiliary structures based on the wave conditions in the shallow sea ecological restoration area;

[0017] S3. Determine the plane layout length, quantity and spacing of auxiliary structure units according to the scope of the beach and shallow sea ecological restoration area.

[0018] Preferably, the S1 is specifically:

[0019] According to the tidal water level table of the shallow sea ecological restoration area, the local tidal range is determined to judge whether the area belongs to the low tide area or the medium tide area. For the low tide area, the auxiliary structures are placed at an average water depth of 2 to 4 meters, and a single-layer stacking form with three groups is adopted. For the medium tide area, the auxiliary structures can be placed at an average water depth of 4 to 5 meters, and a multi-layer stacking form is adopted. The top elevation of the combined permeable submerged dike structure, that is, the highest point of the center position should be no less than 50 cm below the low tide level, the top elevation of the natural wave-breaking combined pile body should be no less than 50 cm above the high tide level, and the bottom should be inserted into the seabed no less than 100 cm.

[0020] Preferably, the S2 is specifically:

[0021] The placement width of the auxiliary structures is adaptively adjusted according to the effective wave height in the shallow sea ecological restoration area. For areas with stronger wave action, that is, Hs>1m, the S1 stacking assembly is arranged horizontally in a continuous manner in no less than 2 groups. For areas with weaker waves, that is, Hs<1m, only one group of the S1 stacking assembly can be arranged horizontally. The installation density of the natural wave-breaking combination piles should increase with the increase of wave action intensity. For areas with weaker waves, the natural wave-breaking combination piles can be installed at intervals in the openings on the top of the combined permeable submerged dike structure. For areas with stronger waves, the installation interval of the natural wave-breaking combination piles should be reduced, and a staggered array installation should be adopted to improve the wave reduction effect.

[0022] Preferably, the S3 is specifically:

[0023] The sheltered area should be no less than 1 km larger than the shallow sea ecological restoration area. The spacing between auxiliary structure units should be 50% to 100% of the plane layout length of the auxiliary structure units. The plane layout length of the auxiliary structure units should be determined according to the size of the area to be protected, and then the number of auxiliary structures to be arranged longitudinally along the coastline should be determined.

[0024] Compared with the prior art, the present invention has the following innovations:

[0025] 1. The auxiliary structure for shallow-sea ecological restoration of the present invention utilizes a modular, permeable submerged dike structure to effectively pass tides and sediment, providing effective water and sediment replenishment for the shallow-sea ecosystem to be restored. The two basic units are constructed for ease of construction and have good stability when combined and stacked. The internal connectivity of the structure is good, making it suitable for use as a natural nest for small marine organisms such as crabs and fish fry.

[0026] 2. The combination of the natural wave-breaking composite piles and the oyster cultivation net structure used in the present invention is eco-friendly and has a service life of 4 to 5 years. During this period, it can provide a stable hydrological environment for the shallow sea ecosystem to be restored. It does not require recycling after being scrapped, reducing maintenance costs. The natural wave-breaking composite piles are naturally degradable and provide rich nutrients to the ecosystem. After the oyster cultivation net structure is detached from the natural wave-breaking composite piles, it can be attached to the combined permeable submerged dike structure to form a natural oyster reef, which has sustainable development benefits and has potential benefits in addressing future sea level rise and climate change.

[0027] 3. The auxiliary structure for beach and shallow sea ecological restoration of the present invention has a simple structure and the raw materials are easy to obtain. Without affecting the water and sand replenishment of the wetland ecosystem, the protective project is organically combined with the oyster reef, realizing the synergistic effect of "hydrology-ecology" in beach and shallow sea ecological restoration. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a schematic structural diagram of an auxiliary structure for beach and shallow sea ecological restoration according to the present invention.

[0029] Figure 2 This is a schematic diagram of the principle of an auxiliary structure for beach and shallow sea ecological restoration according to the present invention.

[0030] Figure 3 Schematic diagram of two basic units of the combined permeable submerged dike structure of the present invention.

[0031] Figure 4 This is an elevation map along the cross section of the area to be repaired according to the second embodiment of the present invention.

[0032] Figure 5 This is a plan view of the repair system according to the second embodiment of the present invention.

[0033] Figure 6 This is a comparison diagram of the wave fields with and without the repair system at various water levels in Example 2 of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the specification of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] Example 1:

[0036] This embodiment provides an auxiliary structure for beach and shallow sea ecological restoration, such as Figure 1As shown, it includes a combined permeable submerged dike structure 1, a natural wave-breaking combined pile body 2, and an oyster cultivation mesh structure 3. The combined permeable submerged dike structure 1 comprises two basic units: a hexagonal hollow prism 11 and an isosceles trapezoidal hollow prism 12. The two basic units have seven equally spaced circular openings on each side. The apertures of each basic unit are consistent, meeting the internal hydrological connectivity requirements of the combined permeable submerged dike structure and allowing the passage of tidal currents and sediment. The basic unit structure is shown in FIG. Figure 3 As shown. In this embodiment, a double-layer stacking form is adopted, in which hexagonal side-opening hollow prisms 11 and isosceles trapezoidal side-opening hollow prisms 12 are staggered and stacked. The natural wave-breaking composite pile body 2 uses 5 bamboos with a diameter of 16 cm to form a natural wave-breaking composite pile body with a diameter of about 48 cm through circular binding. The top, middle and bottom of the composite pile body are reinforced in three sections. The bottom is sharpened to facilitate insertion into the seabed soil. Its basic size is compatible with the size of the circular openings on each side of the hollow prism. The natural wave-breaking composite pile body 2 passes through the combined air-permeable submerged dike structure 1. The friction between the natural wave-breaking composite pile body 2 and the seabed soil can provide effective restraint for the combined air-permeable submerged dike structure 1, which can greatly enhance the stability of the overall structure when it is put into use. The basic structure of the oyster cultivation mesh structure 3 is divided into horizontal fixation and inclined fixation. The natural wave-breaking composite pile body 2 forms a stable triangular mesh structure, which is conducive to maintaining the overall stability.

[0037] Furthermore, in this embodiment, the basic dimensions of the two basic units of the combined permeable submerged dike structure 1 are specifically illustrated using the basic dimensions of a hexagonal hollow prism 11 as an example. The regular hexagon has a side length of 1 meter and a prism length of 7 meters. When laid flat, the hexagonal hollow prism 12 has a height of approximately 1.732 meters. Each side has equally spaced circular openings, which can be viewed as seven 1m*1m squares with 50cm diameter circular openings at their centers. Therefore, the center spacing of each circular opening is 1 meter. This aperture size effectively allows for the passage of tidal currents and sediment, allowing small marine organisms such as crabs, fish fry, and shrimp to freely pass through, providing a living environment for them and potentially enhancing ecological diversity. To ensure the stability of the basic unit, the side thickness of the hollow prism should be no less than 0.2 times the side length, meaning that in this embodiment, the side thickness of each basic unit is no less than 20 cm. When stacked, the combined permeable submerged dike structure 1 has a top height of approximately 2.598 meters and can be placed at a water depth of 4-5 meters to provide a protective environment and water and sediment supply for the wetland ecosystem to be restored. The basic unit dimensions of the combined permeable submerged dike structure 1 can be adaptively adjusted according to actual needs.

[0038] Furthermore, in this embodiment, the natural wave-breaking composite pile bodies 2 are installed at intervals of one opening at the top of the combined permeable submerged dike structure 1. The uniform array installation reduces wave energy, providing a favorable protective environment for the wetland ecosystem to be restored. The natural wave-breaking composite pile bodies 2 can serve as biological migration channels. The concrete pipe piles used in traditional wave-breaking measures are difficult to maintain, and their scrapping produces significant ecological pollution, which is not conducive to sustainable development. Therefore, suitable natural materials are selected as units of the natural wave-breaking composite pile bodies 2 based on local natural resources. For example, dead tree branches can be selected in the mangrove areas along the coast of China, and thick bamboo can be selected in the lush bamboo forests of Southeast Asia.

[0039] Furthermore, in this embodiment, the oyster cultivation mesh structure 3 is made of degradable braided ropes thoroughly soaked in a suspension of oyster shell powder and then alternately woven into a mesh. Knots are provided at each corner to facilitate fixation to the natural wave-breaking combined piles, meeting the filter-feeding environment of oyster cultivation. The mesh is woven into a stable triangular mesh structure with horizontal and tilted fixation, forming a stable triangular mesh structure with the natural wave-breaking combined piles, which helps maintain overall stability. When the oyster larvae are cultivated to a certain level, the oyster cultivation mesh structure can be naturally detached or artificially detached to cover the combined permeable submerged dike structure. Oyster cultivation generally takes 1.5 to 3 years from larval stage to maturity. Here, "certain level" refers to the oysters reaching maturity, at which point the mesh structure connections have been largely degraded and can be naturally detached.

[0040] Based on the above auxiliary structures, it is applied to the construction of shallow sea ecological restoration system, such as Figure 2 As shown, the specific process includes:

[0041] S1. Determine the water depth for placement of auxiliary structures based on the tidal range in the shallow-sea ecological restoration area. Specifically, determine the local tidal range (the difference between high tide and low tide) based on the tidal water table for the shallow-sea ecological restoration area to determine whether the area belongs to a low-tide area (tidal range <2m) or a medium-tide area (tidal range 2-3m). For low-tide areas, auxiliary structures can be placed at an average water depth of 2-4m in a single-layer stacking form. For medium-tide areas, auxiliary structures can be placed at an average water depth of 4-5m in a multi-layer stacking form. The top elevation of the combined permeable submerged dike structure should be at least 50cm below the low-tide water level, and the top elevation of the natural wave-breaking combined pile body should be at least 50cm above the high-tide water level, with the bottom inserted at least 100cm into the seabed.

[0042] S2. Determine the placement width of the auxiliary structures based on the wave conditions in the shallow-sea ecological restoration area. Specifically, the placement width of the auxiliary structures should be adaptively adjusted based on the effective wave height in the shallow-sea ecological restoration area. For areas with strong wave action (wave height Hs>1m), the stacked assemblies in S1 should be arranged in a continuous horizontal arrangement of no less than two groups. For areas with weaker waves (wave height Hs<1m), only one stacked assembly in S1 can be arranged horizontally. The installation density of the natural wave-breaking composite piles should increase with the increase in wave intensity. For areas with weaker waves, the natural wave-breaking composite piles can be installed at intervals in the openings on the top of the combined permeable submerged dike structure. For areas with stronger waves, the installation interval of the natural wave-breaking composite piles should be reduced, and a staggered array installation can be used to improve the wave reduction effect.

[0043] S3. Determine the plane layout length and spacing of the auxiliary structure units according to the scope of the beach and shallow sea ecological restoration area. Specifically, the optimal number of auxiliary structure units is 5 to 6. The shelter area should be no less than 1 km larger than the beach and shallow sea ecological restoration area. The spacing between auxiliary structure units should be 50% to 100% of the plane layout length of the auxiliary structure units. The plane layout length of the auxiliary structure units should be determined according to the size of the area to be protected.

[0044] Example 2:

[0045] This embodiment further illustrates the effectiveness of the present invention in conjunction with a specific scenario.

[0046] In this embodiment, the area to be repaired is a typical wave-dominated shallow sea landform with a concave profile caused by low tidal range and high wave energy. It is located in a 4km*5km sea area, and the area to be repaired is 1km*3.2km. The local tidal range is 1.4m. Figure 4 As shown, the local water depth ranges from 5m in the open sea to about 2.14m within the offshore restoration range, and the effective wave height toward the shore in this area is usually 0.8m.

[0047] S1. The water depth for placing auxiliary structures is determined based on the tidal range in the shallow sea ecological restoration area. Based on the local tidal range, the area is judged to be a low tide area (tidal range <2m). The auxiliary structures can be placed at an average water depth of 2 to 4m. Here, the auxiliary structures are located 2km offshore with an average water depth of 3.78m. A single-layer stacking structure is used. The top elevation of the combined permeable submerged dike structure is -1.78m and is located 108cm below the low tide level. The natural wave-breaking combined pile is 6m long, with the top elevation located 50cm above the high tide level and the bottom inserted 100cm into the seabed.

[0048] S2. Determine the placement width of the auxiliary structure based on the wave conditions in the shallow sea ecological restoration area. Based on the effective wave height of the area, determine that it is a relatively weak wave area (wave height Hs < 1m). The stacked assembly described in step 1 can be arranged horizontally in one group with a placement width of 5m. The natural wave-breaking composite piles are installed at intervals of one opening at the top of the combined open-hole submerged dike structure, using a uniform array installation.

[0049] S3: Determine the layout length and spacing of the auxiliary structure units based on the scope of the shallow sea ecological restoration area. There are 5 auxiliary structure units. The restoration area is 3.2 km in size, and the area to be protected is 4.2 km in size. The spacing between auxiliary structure units is 50% of the layout length of the auxiliary structure units. Based on the size of the area to be protected, the layout length of the auxiliary structure units is 600 m, and the spacing is 300 m.

[0050] like Figure 5 As shown in the figure, the final plan layout of the repair system is determined according to the above steps. The blue rectangles are the auxiliary structures arranged. Figure 6 As shown in the figure, MSL, HSL and LSL represent mean sea level, high tide level and low tide level respectively. Under the three conditions, the auxiliary structures for the ecological restoration of the shallow sea of ​​the shoal can provide a stable shelter environment for the ecological restoration area. Under the most unfavorable condition HSL, the maximum effective wave height in the ecological restoration area is reduced from 0.78m to 0.46m, which can effectively reduce the effective wave height by about 41%. Designing the auxiliary structures for the ecological restoration of the shallow sea of ​​the shoal according to the design method and steps has good benefits.

[0051] In summary, the present invention provides a design method for auxiliary structures for beach and shallow sea ecological restoration. The combined permeable submerged dike structure can effectively pass tides and sediments, and provide effective water and sediment supply for the beach and shallow sea ecosystem to be restored. The structure is simple and easy to construct. The natural wave-breaking combined pile body and the oyster cultivation mesh structure can provide a stable hydrological environment for the beach and shallow sea ecosystem to be restored during combined use. After being scrapped, no recycling is required, which reduces maintenance costs. The natural wave-breaking combined pile body can be naturally degraded and provide rich nutrients for the ecosystem. After the oyster cultivation mesh structure falls off from the natural wave-breaking combined pile body, it can be attached to the combined permeable submerged dike structure to form a natural oyster reef with sustainable development benefits. It has potential benefits for responding to future sea level rise and climate change. It is an auxiliary structure for ecological restoration with "hydrological-ecological" synergistic enhancement functions.

[0052] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

[0053] Although the above describes the specific implementation methods of the present invention, it does not limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. An auxiliary structure for beach and shallow sea ecological restoration, characterized by: It includes a combined permeable submerged dike structure (1), a natural wave-breaking combined pile body (2), and an oyster cultivation net structure (3); The combined permeable submerged dike structure (1) comprises a plurality of groups of hexagonal hollow prisms (11) and corresponding isosceles trapezoidal hollow prisms (12); the hexagonal hollow prisms (11) and the isosceles trapezoidal hollow prisms (12) are in an interlaced stacking structure and have equal column lengths, and the lengths of the six sides of the hexagonal hollow prisms (11) are equal to the waist length and upper side length of the isosceles trapezoidal hollow prisms (12); the sides of the two prisms are provided with a plurality of corresponding openings of a matching number and size, and the aperture size is large enough to effectively pass tidal currents, sediment and small marine organisms; The natural wave-breaking combined pile body (2) is made of natural material and is provided in multiple groups. The combined permeable submerged dike structure (1) is penetrated through the upper and lower openings of the prism body, thereby effectively supporting and fixing the combined permeable submerged dike structure (1). The diameter of the pile body is adapted to the size of the prism opening for easy fixation. The bottom of the combined pile body is inserted into the seabed mud and sand. The oyster cultivation net structure (3) is fixed horizontally and tilted above the combined permeable submerged dike structure (1) by means of natural wave-breaking combined piles (2), and its shape and size are adapted to the stacking structure of the combined permeable submerged dike structure; when the oyster larvae are cultivated to a specific degree, the oyster cultivation net structure (3) can be naturally detached or artificially detached to cover the combined permeable submerged dike structure (1), and the specific degree refers to the oysters reaching a mature stage.

2. The auxiliary structure for beach and shallow sea ecological restoration according to claim 1, characterized in that: In the combined permeable submerged dike structure (1), at least three groups of hexagonal hollow prisms (11) and isosceles trapezoidal hollow prisms (12) are provided. The staggered stacking structure has the center position as the highest height, and the two sides are symmetrically stacked. The innermost and outermost sides are both provided with isosceles trapezoidal hollow prisms (12) for fixation.

3. The auxiliary structure for beach and shallow sea ecological restoration according to claim 1, characterized in that: The natural wave-breaking combined pile body (2) is made of natural wood. The diameter of the combined pile body after being bundled is adapted to the size of the prism opening. The bottom is inserted into the seabed mud and sand by sharpening. The openings of the two prisms are evenly spaced and reinforced in three sections at the top, middle and bottom of the combined pile body.

4. The auxiliary structure for beach and shallow sea ecological restoration according to claim 1, characterized in that: The oyster cultivation net structure (3) is made of degradable material braided ropes that are fully soaked in oyster shell powder suspension and then alternately woven into a net. Knots are provided at each corner to facilitate fixation to the natural wave-breaking combined pile body (2) to meet the filter-feeding environment of oyster cultivation.

5. A method for constructing a shallow sea ecological restoration system, characterized by: Using the auxiliary structure according to any one of claims 1 to 4, and comprising the following process: S1. Determine the water depth for placement of auxiliary structures and the height of staggered stacking of combined submerged dike structures based on the tidal range in the shallow sea ecological restoration area; S2, determine the placement width of auxiliary structures based on the wave conditions in the shallow sea ecological restoration area; S3. Determine the plane layout length, quantity and spacing of auxiliary structure units according to the scope of the beach and shallow sea ecological restoration area.

6. The method for constructing a shallow sea ecological restoration system according to claim 5, characterized in that: The S1 is specifically: According to the tidal water level table of the shallow sea ecological restoration area, the local tidal range is determined to judge whether the area belongs to the low tide area or the medium tide area. For the low tide area, the auxiliary structures are placed at an average water depth of 2 to 4 meters, and a single-layer stacking form with three groups is adopted. For the medium tide area, the auxiliary structures can be placed at an average water depth of 4 to 5 meters, and a multi-layer stacking form is adopted. The top elevation of the combined permeable submerged dike structure, that is, the highest point of the center position should be no less than 50 cm below the low tide level, the top elevation of the natural wave-breaking combined pile body should be no less than 50 cm above the high tide level, and the bottom should be inserted into the seabed no less than 100 cm.

7. The method for constructing a shallow sea ecological restoration system according to claim 5, characterized in that: The S2 is specifically: The placement width of the auxiliary structures is adaptively adjusted according to the effective wave height in the shallow sea ecological restoration area. For areas with strong wave action, that is, wave height Hs>1m, the S1 medium stacking assembly is arranged horizontally in a continuous manner in no less than 2 groups. For areas with weaker waves, that is, Hs<1m, only one group of the S1 medium stacking assembly can be arranged horizontally. The installation density of the natural wave-breaking combination piles should increase with the increase of wave action intensity. For areas with weaker waves, the natural wave-breaking combination piles can be installed at intervals in the openings on the top of the combined permeable submerged dike structure. For areas with stronger waves, the installation interval of the natural wave-breaking combination piles should be reduced, and a staggered array installation should be adopted to improve the wave reduction effect.

8. The method for constructing a shallow sea ecological restoration system according to claim 5, characterized in that: The S3 is specifically: The sheltered area should be no less than 1 km larger than the shallow sea ecological restoration area. The spacing between auxiliary structure units should be 50% to 100% of the plane layout length of the auxiliary structure units. The plane layout length of the auxiliary structure units should be determined according to the size of the area to be protected, and then the number of auxiliary structures to be arranged longitudinally along the coastline should be determined.

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