Spiral intertidal zone wetland structure

Abstract

The utility model discloses a spiral intertidal zone wetland structure, which comprises a water channel, a water retaining structure and a fixed planting structure, the water channel is spirally arranged on a wetland, the water channel comprises a starting port, and the starting port is arranged on one side of the wetland far away from the shore; the water retaining structure comprises a water gap dam and a water retaining dam, the water gap dam is arranged at the starting port, and the water retaining dam is arranged in the middle of the water channel; the fixing and planting structures are arranged on the two sides of the water channel and used for separating the water channel from the plant planting area. The retention time of a water body on the wetland is prolonged through the spiral water channel, the wetland can be kept in a water environment for a long time by blocking the water body in the water channel through the water blocking structure, water and soil loss of the plant planting area can be avoided through the fixed planting structure, and the wetland can provide a good living environment for animals and plants; meanwhile, animals, plants and microorganisms in the plant planting area and the water channel can better absorb and degrade pollutants, the concentration of pollutants entering the sea is reduced, and the ecological environment of the intertidal zone is effectively restored.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of intertidal zone ecological restoration, especially relates to a spiral intertidal zone wetland structure. BACKGROUND

[0002] Intertidal zone is the habitat of many organisms, and the water eutrophication and accumulation of harmful substances caused by sewage discharge can destroy the living environment of animals and plants, weaken the species diversity of intertidal zone, and further destroy the stability of the entire intertidal zone ecosystem. The high content of pollutants has become one of the serious challenges faced by the intertidal zone ecosystem, and thus how to maintain the stability of the intertidal zone ecosystem is a problem to be solved at present. SUMMARY

[0003] The main purpose of the utility model is to provide a spiral intertidal zone wetland structure, which aims to solve the problem of the stability of the intertidal zone ecosystem.

[0004] To achieve the above-mentioned purpose, the utility model provides a spiral intertidal zone wetland structure, which is arranged on the intertidal zone wetland, and the spiral intertidal zone wetland structure comprises a water channel, a water retaining structure and a fixed planting structure, the water channel is arranged in a spiral on the intertidal zone wetland, the water channel comprises a starting port, and the starting port is arranged on the side of the intertidal zone wetland far from the shore; the water retaining structure comprises a water inlet dam and a water retaining dam, the water inlet dam is arranged at the starting port, and the water retaining dam is arranged in the middle of the water channel; the fixed planting structure is arranged on both sides of the water channel, and the fixed planting structure is used for spacing the water channel and the plant planting area to prevent water and soil loss in the plant planting area when the water in the water channel flows.

[0005] The spiral intertidal zone wetland structure of the utility model can keep the wetland in a water environment for a long time by prolonging the residence time of water in the wetland through the spiral water channel and blocking the water in the water channel through the water retaining structure, the fixed planting structure arranged between the water channel and the plant planting area can avoid water and soil loss in the plant planting area, so that the wetland can provide a good living environment for animals and plants, promote the stability of the intertidal zone ecosystem, and the animals, plants and microorganisms in the plant planting area and the water channel can better absorb and degrade pollutants, reduce the concentration of pollutants entering the sea, and effectively restore the ecological environment of the intertidal zone.

[0006] In some embodiments, the number of water inlet dams is the same as the number of starting ports; the number of water retaining dams is multiple, and the multiple water retaining dams are arranged in the water channel along the extension direction of the water channel.

[0007] In some embodiments, the top elevation of the water retaining dam increases in sequence along the extension direction of the water channel from the starting port.

[0008] In some embodiments, the top elevation of the water retaining structure is higher than the mean low water level and lower than the mean high water level.

[0009] In some embodiments, the water retaining structure is filled with gabion stone or rock.

[0010] In some embodiments, the planting area is covered with a soil layer for shaping an environment suitable for plant growth.

[0011] In some embodiments, the planting design elevation of the planting area is higher than the mean low water level and lower than the mean high water level.

[0012] In some embodiments, the fixed planting structure comprises pine piles, geotextile and steel nails, the pine piles are densely arranged vertically in a single row along the side of the water channel, and the geotextile is fixed to one side of the pine piles facing the planting area by the steel nails.

[0013] In some embodiments, the top elevation of the pine piles is higher than the planting design elevation of the planting area.

[0014] In some embodiments, the spiral intertidal wetland structure further comprises a middle water discharge channel, one end of the middle water discharge channel is in communication with the water channel near the shore, and the other end is in communication with a sewage outlet on the shore.

[0015] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0017] Figure 1 FIG. 1 is a schematic diagram of a spiral intertidal wetland structure in the present application;

[0018] Figure 2 FIG. 4 is a plan view of a water intake dam in the present application;

[0019] Figure 3 FIG. 5 is a plan view of a water retaining dam in the present application;

[0020] Figure 4 FIG. 6 is a cross-sectional view of a water retaining structure in the present application;

[0021] Figure 5 Fig. 1 is a plan view of a solid planting structure according to the present application;

[0022] Figure 6 Fig. 2 is a sectional view of the solid planting structure according to the present application.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 100 spiral intertidal wetland structure, 10 water channel, 11 starting port, 21 water port dam, 22 water retaining dam, 30 solid planting structure, 31 pine pile, 32 geotextile, 33 steel nail, 40 plant planting area, 50 middle water discharge channel.

[0025] The object, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0028] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but must be based on the realization of a person skilled in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0029] Please refer to Figures 1-6The utility model provides a spiral intertidal wetland structure 100 for arranging on the intertidal wetland, and the spiral intertidal wetland structure 100 includes water channel 10, water retaining structure and fixed planting structure 30, water channel 10 is arranged in spiral on the intertidal wetland, and water channel 10 includes starting mouth 11, and starting mouth 11 is set up at the side of the intertidal wetland far from the shore, water retaining structure includes water inlet dam 21 and water retaining dam 22, and water inlet dam 21 is set up at starting mouth 11, and water retaining dam 22 is set up in the middle of water channel 10, and fixed planting structure 30 is set up at both sides of water channel 10, and fixed planting structure 30 is used to interval water channel 10 and plant planting area 40 to prevent the water and soil loss in plant planting area 40 when water body flows in water channel 10.

[0030] The spiral intertidal wetland structure 100 of the utility model can keep the wetland in water environment for a long time by prolonging the residence time of water body on the wetland through the spiral water channel 10 and blocking the water body in the water channel 10 by the water retaining structure, the fixed planting structure 30 arranged between the water channel 10 and the plant planting area 40 can avoid the water and soil loss in the plant planting area 40, so that the wetland can provide a good living environment for animals and plants and promote the stability of the intertidal ecological system, and the animals, plants and microorganisms in the plant planting area 40 and the water channel 10 can better absorb and degrade pollutants, reduce the concentration of pollutants entering the sea and effectively repair the ecological environment of the intertidal zone.

[0031] Specifically, as shown in the figure, Figure 1 The water channel 10 can be arranged in a spiral shape on the entire intertidal wetland, and the other areas of the wetland except the water channel 10 can be the plant planting area 40, which can be used for planting plants. The plants can not only effectively purify the water body, but also provide a good living environment for animals and microorganisms in the water body, and the diversity of animals and microorganisms in the water body can further purify the water body.

[0032] The water channel 10 can be arranged as tortuously as possible on the integrated wetland, and the tortuous water channel 10 can better prolong the residence time of the water body in the water channel 10, so that the animals and plants on the wetland have a good living environment and can better purify the water body.

[0033] The water channel 10 can have a starting mouth 11, which can be arranged at the side of the wetland far from the shore, i.e. close to the sea water, so that the water body can better flow into the water channel 10 from the starting mouth 11 during the tide rise, improving the exchange degree of the water body in the water channel 10 and the external water body.

[0034] The length and width of the water channel 10 can be designed according to the specific topography of the wetland, and the specific arrangement mode of the water channel 10 is not limited in the application, and the water channel 10 can be arranged in a spiral shape to extend the residence time of the water body.

[0035] The water retaining structure is mainly used for intercepting the water in the waterway 10, so that the waterway 10 can still be in a water environment during the ebb tide. The water retaining structure can include a water inlet dam 21 and a water retaining dam 22. The water inlet dam 21 is arranged at the starting opening 11 of the waterway 10 to block the water in the waterway 10 from flowing out of the starting opening 11, so that the water can stay in the waterway 10 for a longer time. The water retaining dam 22 is arranged in the middle of the waterway 10, and the water retaining dam 22 can segmentally store water in the waterway 10, effectively reducing the outflow speed of the water in the waterway 10, so that the waterway 10 near the shore side can also store sufficient water to maintain a water environment for the wetland.

[0036] As shown in Figures 2-4 , the shape of the water inlet dam 21 can be set as an arc structure. Since the water inlet dam 21 is mainly used to block the starting opening 11 of the waterway 10 to prevent the water in the waterway 10 from flowing out of the starting opening 11, the arc-shaped water inlet dam 21 can reduce the impact of the water on the dam body, play a certain buffering role, improve the stability of the dam body, and better block the water in the waterway 10. The water retaining dam 22 is arranged in the middle of the waterway 10 and along the extension direction of the waterway 10. The width of the water retaining dam 22 can be set according to the width of the waterway 10. Of course, the shape and width of the water inlet dam 21 and the water retaining dam 22 are not limited in the present application, and can be set according to the conditions of the starting opening 11 and the waterway 10.

[0037] As shown in Figure 5 and Figure 6 , the planting structure 30 is mainly used for fixing the plant growth range and providing a stable growth environment for the plants. The planting structure 30 is arranged at the side of the waterway 10 to separate the waterway 10 from the plant planting area 40, preventing water and soil loss caused by the rising and falling tides from affecting the survival of the plants.

[0038] In summary, the main principle of the spiral intertidal wetland structure 100 in the present application for improving the stability of the intertidal wetland ecosystem is to reconstruct the present situation of the intertidal beach, vegetation, animals, and microbial community, artificially create a long-term water wetland environment, and form an ecological buffer zone. The microbial metabolism process and the plant and animal absorption and degradation process in the wetland can precipitate and treat the pollutants brought into the sea by surface runoff, reduce the concentration of pollutants entering the sea, exchange water bodies by the rising and falling tides of seawater, and realize the function of purifying the polluted seawater in the intertidal zone. At the same time, the various plant habitats provided by the wetland are conducive to the restoration of species diversity in the intertidal zone, thereby realizing the function of ecological restoration and improving the stability of the intertidal wetland ecological environment.

[0039] Please refer to Figure 1In some embodiments, the number of water inlets 21 is the same as the number of starting inlets 11; the number of water retaining dams 22 is multiple, and the multiple water retaining dams 22 are arranged in the water channel 10 along the extension direction of the water channel 10. In this way, the water retaining structure can better block the water in the water channel 10, so that the wetland can be kept in a water environment for a long time, and the plants, animals and microorganisms on the wetland can better survive in the wetland, repairing the ecological environment of the wetland.

[0040] In some embodiments, the top elevations of the water retaining dams 22 gradually increase along the extension direction of the water channel 10 from the starting inlets 11. In this way, the water retaining dams 22 can better block the water in the water channel 10, and the water channel 10 far from the starting inlets 11 can also store enough water to keep the wetland in a water environment.

[0041] Specifically, the top elevation of the water retaining dam 22 can be understood as the height of the highest point of the dam body in the vertical direction. Since the seawater gradually moves away from the shore during the ebb tide, the top elevation of the water retaining dam 22 near the shore is higher than that of the water retaining dam 22 far from the shore, which can store more water in the water channel 10 near the shore, thereby better keeping the wetland in a water environment and avoiding the water channel 10 near the shore from drying up during the ebb tide, affecting the ecological environment of the wetland.

[0042] In some embodiments, the top elevation of the water retaining structure is higher than the multi-year average low tide level and lower than the multi-year average high tide level. In this way, the seawater can enter the water channel 10 and exchange with the water in the water channel 10 when the seawater rises, and the water retaining structure can block the water and store it in the water channel 10 when the seawater recedes.

[0043] Please refer to Figures 1-4 In some embodiments, the water retaining structure is made of gabion stone cages or stacked and filled with blocks. In this way, not only can it effectively block the water, but also can ensure that the water can be stored and exchanged between the different water retaining dams 22.

[0044] In some embodiments, the size of the gabion stone cages or blocks used in different positions of the water retaining dams 22 can be different. For example, the block size of the water inlet dam 21 can be 200-300 mm, which can just block the water in the water channel 10, and the block size of the water retaining dam 22 can be 400-500 mm, which can not only block the water, but also provide a good exchange space for the water in the water channel 10. At the same time, the water retaining dam 22 can also have a certain aeration and oxygenation effect during the flow of the water, creating a better living environment for plants and animals and improving the purification effect.

[0045] Please refer to Figure 5 and Figure 6In some embodiments, the planting area 40 is covered with a layer of soil, which is used to create an environment suitable for plant growth. The planting area 40 is used to grow plants that can grow well in a brackish water environment. The topography of the planting area 40 is arranged to have a natural slope from the highest point to the lowest point. The bottom of the planting area is covered with a layer of soil that meets the growth requirements. The arrangement of plants and the size of the seedlings are determined based on the overall design and the surrounding environment. The micro-topography is shaped to create growth conditions suitable for salt marsh vegetation, and a multi-level salt marsh wetland community is constructed to improve the waterfront landscape and form a healthy and benign cycle of salt marsh wetland ecological shoreline while ensuring purification effect and ecological function.

[0046] The planting area 40 and the waterway 10 should be arranged at intervals, and the highest point of the terrain after the waterway 10 extends outward on both sides is located in the planting area 40, and the lowest point of the corresponding terrain is located in the waterway 10 to ensure water retention.

[0047] In some embodiments, the planting design of the planting area 40 has an elevation higher than the average low tide level and lower than the average high tide level. In this way, when the tide rises, the seawater submerges the planting area 40 to provide necessary nutrients for animals and plants, and when the tide recedes, the planting area 40 can purify the stored seawater and improve the stability of the intertidal wetland ecological environment.

[0048] It can be understood that during the rising tide, when the design high tide level is higher than the water level in the waterway and higher than the average high tide level, aquatic animals enter the waterway 10 with the tide, and the tide and the original water in the waterway 10 exchange water until the water level in the waterway 10 is higher than the design high tide level, and the entire wetland area is submerged.

[0049] During the ebb tide, the water level continues to drop, and the waterway 10 can provide a habitat for aquatic animals. When the water level in the waterway is lower than the average high tide level, the waterway 10 gradually becomes a static purification tank, which uses microbial metabolism and plant and animal absorption and degradation processes to precipitate and treat pollutants brought into the ocean by surface runoff, thereby reducing the concentration of pollutants entering the sea and achieving the function of purifying seawater in the intertidal zone.

[0050] Please refer to Figure 5 and Figure 6 In some embodiments, the planting structure 30 includes pine stakes 31, geotextile 32, and steel nails 33. The pine stakes 31 are vertically and densely arranged in a single row along the sides of the waterway 10, and the geotextile 32 is fixed to one side of the pine stakes 31 facing the planting area 40 by the steel nails 33. The planting structure 30 is mainly used to fix the growth range of plants and provide a stable growth environment for plants to prevent water and soil loss caused by the rising and falling tides from affecting plant survival.

[0051] Since the intertidal wetland is generally located on a muddy coast, the pine pile 31 has good corrosion resistance and can be used for a relatively long period of time. The pine pile 31 can improve the drainage condition, enhance the soil stability, and provide support for the plant root system. The geotextile 32 can further reduce the water loss in the filling layer, so that the wetland can be kept in a water state for a long time. The steel nails 33 can be made of stainless steel material, and the geotextile 32 is fixed on the pine pile 31 by the steel nails 33. Further, the fixed planting structure 30 formed by the pine pile 31 and the geotextile 32 can effectively prevent water and soil loss, and provide a good maintenance condition for the plant planting area 40.

[0052] In some embodiments, the top elevation of the pine pile 31 is higher than the planting design elevation of the plant planting area 40. In this way, the pine pile 31 with the top elevation higher than the plant planting area 40 during the ebb tide can better stabilize the filling layer in the plant planting area 40, prevent water and soil loss on the filling layer, and enable the plants to grow better in the plant planting area 40.

[0053] Please refer to Figure 1 In some embodiments, the spiral intertidal wetland structure 100 further comprises a middle water discharge channel 50, one end of which is in communication with the waterway 10 close to the shore, and the other end is in communication with the sewage outlet on the shore.

[0054] The middle water discharge channel 50 is mainly used to discharge the surface runoff containing pollutants into the sea. The middle water discharge channel 50 can be arranged or not arranged according to the situation. If there is middle water discharged by the surrounding sewage treatment facilities, the structure can be arranged to directly discharge the middle water into the waterway 10, so as to better purify the sewage.

[0055] The present application provides a specific embodiment of a spiral intertidal wetland structure 100:

[0056] The spiral intertidal wetland structure 100 is arranged close to the present seawall on the sea side, and the wetland area formed thereby can reach 25098 square meters. The waterway 10 is about 730m long, and the width of the waterway 10 is 2m-35m. The waterway 10 is in a spiral shape and is arranged as tortuously as possible, and totally contains more than ten bends to prolong the water residence time and ensure the purification effect. Three water retaining structures are arranged in the waterway 10. The water inlet dam 21 is located at the entrance of the waterway 10 on the sea side, is about 56.7m long, has a total width of 6.8m, and has a dam top elevation of 0.6m. The material of the water inlet dam 21 is gabion stone cage, and the particle size of the filling block stone is about 200-300mm. A water retaining dam 22 is arranged on the side of the waterway 10 close to the sea, is about 3m long, has a total width of 6.8m, and has a dam top elevation of 0.8m. The material of the water retaining dam 22 is 400-500mm block stone paving. A water retaining dam 22 is arranged on the side of the waterway 10 close to the shore, is about 4m long, has a total width of 6.8m, and has a dam top elevation of 1.0m. The material of the water retaining dam 22 is 400-500mm block stone paving.

[0057] The working principle is that during the rising tide process, when the design high tide level 1.5m>water level in the waterway>average high tide level 1m, aquatic animals enter the waterway 10 with the tide water, and the tide water and the original water body in the waterway 10 exchange water until the water level in the waterway>design high tide level 1.5m, and the entire wetland area is submerged; during the ebb tide process, the water level continues to drop, and the waterway 10 can provide a habitat for aquatic animals, and when the water level in the waterway<average high tide level 1m, the waterway 10 gradually becomes a static purification tank, which uses the metabolic process of microorganisms and the absorption and degradation process of plants and animals to precipitate and treat pollutants brought into the ocean by surface runoff, thereby reducing the concentration of pollutants entering the sea and achieving the function of purifying the polluted seawater in the intertidal zone.

[0058] The plant planting area 40 is used for planting plants, and plants that can grow well in brackish water environment should be selected, and in this case, paper reed, flowering bamboo, water iris, reed, water onion, powder lady banana, and other plants are selected, and the total planting area is 15162㎡; The terrain layout in the plant planting area 40 should be undulating, changing between 0.1m-2.0m, and the highest point to the lowest point presents a natural slope state with a slope ratio of 1:4; The bottom of the planting area should be paved with soil layer that meets the growth requirements; The arrangement scheme and seedling size of the plants are determined comprehensively according to the overall design scheme and the surrounding environment, and there is no fixed type requirement, fast-growing seedlings, slow-growing seedlings, large seedlings, and small seedlings can be used, and the growth conditions suitable for salt marsh vegetation are formed through micro-terrain shaping to construct a multi-level salt marsh wetland community, which can improve the waterfront landscape while ensuring the purification effect and ecological function, and form a healthy and benign cycle of salt marsh wetland ecological coastline.

[0059] The plant planting area 40 and the waterway 10 are arranged at intervals, and the highest point of the terrain after extending outward on both sides of each waterway 10 is located in the plant planting area 40, and the lowest point of the corresponding terrain is located in the waterway 10, so as to ensure water retention.

[0060] The fixed planting structure 30 is used to fix the plant growth range and provide a stable growth environment for the plants to prevent water and soil loss caused by the rising and falling tide process from affecting the survival of the plants, which includes pine piles 31, geotextiles 32, and stainless steel nails 33; In this case, the pine piles 31 are located on the muddy coast and are corrosion-resistant, which can be used to improve drainage conditions, enhance soil stability, and provide support for plant root systems. A single row of dense pine piles 31 is generally used, and the length and size are determined according to the calculation results. In this case, a single row of dense pine piles 31 with a diameter of 150mm, a tail diameter of 80mm, and a length of 6m is used, and the top of the pine piles 31 is 200mm higher than the plant planting design elevation. Two layers of 150g / ㎡ geotextiles 32 are laid on the inside of the pine piles 31 for drainage and to prevent water and soil loss; The stainless steel nails 33 are used to fix the geotextiles 32, with a diameter of 8mm and a spacing of 600mm, and the number of layers is determined according to the design scheme. In this case, three layers are arranged.

[0061] The middle water discharge channel 50 is used for discharging the surface runoff containing pollutants into the sea, and is arranged as needed, and if there is middle water discharged by a sewage treatment facility in the periphery, the structure can be provided to directly discharge the middle water into the water channel 10 for purification treatment.

[0062] In summary, the spiral intertidal wetland structure 100 of the present application can keep the wetland in a water environment for a long time by prolonging the residence time of water in the wetland through the spiral water channel 10 and blocking the water in the water channel 10 by the water retaining structure, the fixed planting structure 30 arranged between the water channel 10 and the plant planting area 40 can avoid soil erosion of the plant planting area 40, so that the wetland can provide a good living environment for animals and plants, promote the stability of the intertidal ecosystem, and at the same time, the animals and plants and microorganisms in the plant planting area 40 and the water channel 10 can better absorb and degrade pollutants, reduce the concentration of pollutants entering the sea, and effectively restore the ecological environment of the intertidal zone.

[0063] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields, or the like made by using the content of the present application specification and drawings within the inventive concept of the present application are included in the patent protection scope of the present application.

Claims

1. A spiral intertidal wetland structure for placement on an intertidal wetland, characterized by, The application relates to a spiral intertidal wetland structure comprising: a water channel arranged spirally on the intertidal wetland, the water channel comprising a starting port arranged on a side of the intertidal wetland far from the shore; a water retaining structure comprising water inlet dams arranged at the starting ports and water retaining dams arranged in the middle of the water channel; a planting structure arranged on both sides of the water channel, the planting structure being used for spacing the water channel and a plant planting area to prevent water and soil loss in the plant planting area when water in the water channel flows.

2. The spiral intertidal wetland structure of claim 1, wherein, The number of the water inlet dams is the same as that of the starting ports. The number of the water retaining dams is multiple, and the multiple water retaining dams are arranged in the water channel along the extension direction of the water channel.

3. The spiral intertidal wetland structure of claim 2, wherein, The top elevations of the water retaining dams are sequentially increased along the extension direction of the water channel from the starting ports.

4. The spiral intertidal wetland structure of claim 1, wherein, The top elevation of the water retaining structure is higher than the average low tide level and lower than the average high tide level.

5. The spiral intertidal wetland structure of claim 1, wherein, The water retaining structure is made of gabion stone cages or stacked and filled block stones.

6. The spiral intertidal wetland structure of claim 1, wherein, The surface of the plant planting area is paved with a filling layer, and the filling layer is used for shaping an environment suitable for plant growth.

7. The spiral intertidal wetland structure of claim 1, wherein, The planting design elevation of the plant planting area is higher than the average low tide level and lower than the average high tide level.

8. The spiral intertidal wetland structure of claim 1, wherein, The planting structure comprises pine piles, geotextiles and steel nails, the pine piles are vertically densely paved in a single row on the side of the water channel, and the geotextiles are fixed on one side of the pine piles facing the plant planting area through the steel nails.

9. The spiral intertidal wetland structure of claim 8, wherein, The top elevation of the pine piles is higher than the planting design elevation of the plant planting area.

10. The spiral intertidal wetland structure of claim 1, wherein, The spiral intertidal wetland structure further comprises a middle water discharge channel, one end of the middle water discharge channel is communicated with the water channel close to the shore, and the other end is communicated with a sewage outlet on the shore.

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