A system for pollution reduction, carbon sink increase and disaster response in the intertidal zone of the coast

Abstract

The utility model discloses a system for coast intertidal zone pollution reduction-harvesting-increased disaster, which comprises an ecological ditch area, an artificial reef area and a mangrove area in sequence from the coast to the offshore direction. The ecological ditch area comprises an ecological revetment, a ditch and a filter tank in sequence from the coast to the offshore direction, and a sedimentation tank is arranged at the end of the ditch. The filter tank is located at the offshore side of the sedimentation tank. A water retaining ridge is arranged near the filter tank in the offshore direction. The artificial reef area comprises a plurality of first artificial reefs. The mangrove area comprises mangroves and second artificial reefs in sequence from the coast to the offshore direction. The system realizes deep cooperation of "ditch pollution reduction-reef purification protection-mangrove harvesting increase", and achieves efficient treatment of intertidal zone sewage, coast protection and efficient harvesting increase.

Description

Technical Field

[0001] This utility model belongs to the field of environmental pollution control and ecological restoration, specifically relating to a system for reducing pollution, increasing sequestration, and responding to disasters in the intertidal zone of the coast. Background Technology

[0002] The intertidal zone, as a key ecological barrier for land-sea interaction, serves multiple functions, including pollutant buffering, carbon storage, and coastal protection. However, it currently faces three core threats: (1) Problem of superimposed pollution: The intertidal zone is affected by both the cyclical movement of tides and land runoff. On the one hand, nitrogen and phosphorus from agricultural non-point sources and persistent organic matter (such as antibiotics and dyes) and heavy metals from industrial / aquaculture wastewater enter the intertidal zone through surface runoff. On the other hand, pollutants from nearshore waters (such as nitrogen and phosphorus from aquaculture tailwater and oil pollution from ships) are carried back to the intertidal zone with the rising tide. The long-term deposition and accumulation of these two types of pollutants in the intertidal zone leads to excessive bottom sediment pollution. Subsequently, the pollutants enter the overlying water bodies through bottom sediment resuspension and pore water release, causing water quality deterioration. This not only threatens the survival of benthic organisms such as shellfish, snails, and clams, but also affects the habitat and reproduction of dominant intertidal organisms such as shrimp and crabs, and damages the integrity of the ecological community structure. (2) Decline in carbon sequestration function: Due to land reclamation and pollution stress, the original mangrove forests and salt marsh vegetation in the intertidal zone have degraded, the decomposition of organic carbon in the bottom sediment has accelerated, the carbon sequestration capacity has decreased compared with the natural state, and it is difficult to play the ecological value of "blue carbon". (3) Increased disaster risk: Global sea level rise and frequent extreme weather (typhoons, storm surges) have accelerated the rate of erosion of the intertidal zone. Although traditional concrete seawalls can resist some disasters, they have poor ecological compatibility, destroy the intertidal habitat, and cannot cope with the long-term erosion caused by the alternation of tides.

[0003] Therefore, there is a need to provide a system that combines pollution reduction, sequestration enhancement, and disaster response for coastal intertidal zones. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a system for pollution reduction, sedimentation, and disaster response in the intertidal zone. It addresses the complex problems of "land-based pollution input - tidal pollution enrichment - storm surge erosion" in the intertidal zone and the poor environmental adaptability of existing coastal intertidal ecological restoration systems (failing to fully consider the unique environment of the intertidal zone with "tidal alternation, high salinity and humidity, and strong scouring; for example, the lack of anti-loss and fixation measures for microbial agents leads to a significant decrease in the effectiveness of the technology) and insufficient functional synergy (each technology only achieves a single function, such as ditches only reducing pollution, reefs only responding to disasters, and mangroves only...). The current approach to mangrove reef enhancement lacks a coordinated system of "pollution reduction-reef enhancement-disaster response," making it incapable of addressing complex intertidal issues. It also suffers from low long-term effectiveness and cost-effectiveness (traditional technologies lack dynamic adjustment and maintenance design; for example, mangroves lack wave protection, microbial agents lack replenishment mechanisms, and the treatment effect has a short maintenance period (usually 2-3 years), with high costs for repeated maintenance). This invention provides an ecological restoration system integrating "ecological ditch interception, magnetic microbial agent degradation, artificial reef protection, and mangrove reef enhancement," suitable for comprehensive ecological management in the intertidal zone and adjacent land-river-sea confluence areas.

[0005] The technical solution adopted by this utility model to solve its technical problem is: This utility model provides a system for pollution reduction, sedimentation enhancement and disaster response in the intertidal zone of the coast, which includes an ecological ditch area, an artificial reef area and a mangrove area in sequence from the coast to the nearshore direction; From the coastline towards the nearshore direction, the ecological ditch area includes ecological revetment, ditch and filtration pond in sequence. A sedimentation pond is located at the end of the ditch, and the filtration pond is located on the nearshore side of the sedimentation pond. A water-retaining sill is provided near the nearshore side of the filtration pond. The artificial reef area includes multiple first artificial reefs; the first artificial reef has a channel from the coast to the nearshore direction. The channel is equipped with a stainless steel filter screen near the nearshore direction and a backflow baffle near the coast. The backflow baffle can be opened and closed with the tide, closing during high tide and opening during low tide. The channel is filled with porous carbon loaded with magnetic bacteria agent. From the coast towards the nearshore area, the mangrove area includes mangroves and a second artificial reef.

[0006] In some implementations, ecological revetments include geotextile / ecobags, *Phyllostachys edulis*, and *Reed florida*. The geotextile / ecobags serve as the slope, *Phyllostachys edulis* is planted along the coastline, and *Reed florida* is planted on the slope. To prevent the *Phyllostachys edulis* and *Reed florida* from growing too tall and falling over, or from decaying and becoming polluted, they need to be pruned regularly.

[0007] In some embodiments, the sedimentation tank includes an outlet and a sludge discharge outlet, with the outlet connected to the filtration tank; the outlet is located in the upper part of the sedimentation tank, and the sludge discharge outlet is located at the bottom of the sedimentation tank.

[0008] In some embodiments, the filter pool includes filter media, turf, and a drain outlet, with the filter media located at the bottom of the filter pool, the turf located on the filter media, and the drain outlet located at the bottom of the filter pool near the sea.

[0009] In some implementations, the drain outlet is equipped with a check valve, allowing unidirectional flow from the filtration pool towards the artificial reef area.

[0010] In some implementations, a buffer zone is provided between the filtration pool and the artificial reef area.

[0011] In some embodiments, the surface of the first artificial reef is provided with multiple holes and grooves.

[0012] In some implementations, the first artificial reef is a cube or a triangular prism.

[0013] In some implementations, the first artificial reef has at least two rows, with adjacent rows staggered left and right.

[0014] In some embodiments, the angle between the backflow baffle and the channel cross-section is 20-50°; the backflow baffle is fixed to the channel near the coast via a rotatable device.

[0015] In some embodiments, the rotatable device is provided with a torsion spring.

[0016] In some implementations, the mangrove forest includes Kandelia candel, tung tree, and thorny bush, with Kandelia candel located closer to the coast, tung tree in the middle, and thorny bush closer to the nearshore area.

[0017] In some implementations, the structure of the second artificial reef is the same as that of the first artificial reef.

[0018] In some implementations, pine stake dikes are set up around the mangroves.

[0019] This invention addresses the integrated needs of "pollution reduction, carbon sequestration enhancement, and disaster response" in the intertidal zone. Leveraging the spatial gradient of the intertidal zone—from the land side to the core intertidal area to the sea side—it constructs a closed-loop governance system encompassing "land-side source interception and pollution reduction, enhanced degradation in the core intertidal area, and sea-side protection and carbon sequestration enhancement." By modifying ecological ditches to adapt to the tidal environment, integrating magnetic microbial agents with artificial reefs achieves erosion resistance and efficient degradation. Combined with mangroves for synergy, the ultimate goal is to achieve controllable intertidal pollution, increased carbon sequestration, and preventable disasters.

[0020] This invention addresses the problem of land-based pollutants entering the intertidal zone via surface runoff, as well as the accumulation of nearshore pollutants in the intertidal zone due to tidal carrying, thereby reducing pollution load from both the source and the core area.

[0021] This invention solves the problems of easy loss and low degradation efficiency of magnetic bacterial agents in the highly dynamic environment of the intertidal zone, and improves the long-term effectiveness of pollution reduction.

[0022] This invention resolves the conflict between intertidal disaster response and ecology, enhancing the carbon sequestration function and biodiversity of mangroves while resisting storm surges and shoreline erosion.

[0023] This utility model utilizes ecological ditch areas to reduce pollution, increase plant biomass, and fix carbon. It initially removes insoluble matter, nitrogen, phosphorus, and heavy metals from land-based sewage, avoiding blockage of microbial agent channels in artificial reef areas, damage to microbial agent activity, and harm to other marine life. Water treated by ecological ditch areas and artificial reef areas has less pollutant, resulting in higher survival and growth rates of mangroves. At the same time, the mangrove area reduces pollution, lowers carbon, and provides disaster preparedness. Its wave-shrinking effect can reduce the loss of microbial agents and improve the growth environment of marine life. The artificial reef area further reduces waves, providing better protection for the embankment while also reducing pollution.

[0024] The beneficial effects of this utility model are: This utility model has strong adaptability to the intertidal environment: each module is designed for the tidal, high salinity and strong scouring characteristics of the coastal intertidal zone, such as the ecological ditch water-retaining structure and the reef microbial agent anti-loss device, which solves the problem that traditional technologies are difficult to apply in the intertidal zone. This utility model achieves a breakthrough in functional synergy: for the first time, it realizes deep synergy between "ditch pollution reduction - reef purification and protection - mangrove carbon sequestration enhancement", with the total pollution removal rate increasing by 30%-40% compared to the original isolated technology, the wave resistance capacity increasing by more than 50% compared to the original single reef technology, and the carbon sequestration capacity increasing by 10-20% compared to the original single mangrove technology, thus realizing the integration of "pollution reduction - carbon sequestration enhancement - disaster response". This invention offers superior long-term effectiveness and cost-effectiveness: the reef body integrating magnetic bacterial agents extends the activity period of the agents to 6-8 months, increases the survival rate of mangrove seedlings to ≥80%, extends the maintenance period to 1-2 years, and reduces maintenance costs by 40%-50% compared to the original technology; moreover, the materials (such as reef body material and mangrove species) have a high local availability rate, reducing construction costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the system of this utility model for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast.

[0026] Figure 2 This is a schematic diagram of the structure of the first artificial reef.

[0027] Among them, 11. Windmill grass, 12. Variegated reed, 13. Geotextile / ecological bag, 14. Sedimentation tank, 141. Sludge discharge port, 142. Water outlet, 15. Filter tank, 151. Filter media, 152. Drainage outlet, 153. Potamogeton crispus, 16. Water retaining wall, 17. Buffer zone, 21. First artificial reef, 31. Kandelia candel, 32. Paulownia tomentosa, 33. Ratwort, 34. Second artificial reef, 211. Channel, 212. Backflow baffle, 213. Porous carbon loaded with magnetic bacteria agent, 214. Stainless steel filter screen. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in this utility model do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0030] Reference Figure 1 , Figure 2 This utility model optimizes and integrates the environmental characteristics of the coastal intertidal zone, and provides a system for pollution reduction, sedimentation and disaster response in the coastal intertidal zone. It includes three core modules from the coast to the nearshore direction: ecological ditch area, artificial reef area and mangrove area, so as to realize the synergistic function of "pollution reduction, sedimentation and disaster response". From the coastline toward the nearshore direction, the ecological ditch area includes an ecological revetment, a ditch, and a filtration pond 15. A sedimentation pond 14 is located at the end of the ditch, and the filtration pond 15 is located on the nearshore side of the sedimentation pond 14. A water-retaining sill 16 is provided near the nearshore direction of the filtration pond 15. The artificial reef area includes multiple first artificial reefs 21. Each first artificial reef 21 has a channel 211 extending from the coast towards the nearshore area. The channel 211 near the nearshore area is equipped with a stainless steel filter screen 214, and a backflow baffle 212 near the coast. The backflow baffle 212 can open and close with the tides, closing during high tide and opening during low tide. The channel 211 is filled with porous carbon 213 loaded with magnetic bacterial agents. The backflow baffle 212 reduces the loss of the porous carbon 213 loaded with magnetic bacterial agents. During high tide, it strengthens the fixation of the bacterial agents, preventing more thorough loss. Although the filters at both ends can block the bacterial agents, the high-velocity nearshore water flow during high tide can easily cause the bacterial agent-activated carbon composite to leak through the filter screen gaps. The backflow baffle 212 closes during high tide, directly blocking the water flow impact path, preventing direct scouring of the composite, and reducing bacterial agent loss. On the other hand, it can reduce clogging and lower maintenance costs. The filter screens at both ends are easily clogged by bottom sediment particles and plankton carried by the tide (they need to be cleaned once every 1-2 months). The filter screens need to be disassembled when cleaning, which can easily damage the bacterial agent carrier. When the backflow baffle 212 is closed, it can block most impurities from passing through the channel. At the same time, it is convenient to replace / replenish the porous carbon 213 loaded with magnetic bacterial agent. The porous carbon 213 loaded with magnetic bacterial agent can be replaced / replenished from one side of the backflow baffle 212 without disassembling the device. From the coast towards the nearshore area, the mangrove area includes mangroves and a second artificial reef 34.

[0031] In one specific embodiment, the ecological revetment includes geotextile / ecological bags 13, windmill grass 11, and variegated reed 12. The geotextile / ecological bags 13 serve as the slope, windmill grass 11 is planted on the coast, and variegated reed 12 is planted on the slope.

[0032] In one specific embodiment, the sedimentation tank 14 includes an outlet 142 and a sludge discharge outlet 141. The outlet 142 is connected to the filter tank 15. The outlet 142 is located in the upper part of the sedimentation tank, and the sludge discharge outlet 141 is located at the bottom of the sedimentation tank.

[0033] In one specific embodiment, the filter pool 15 includes filter media 151, pickled mustard greens 153 and drain outlet 152. The filter media 151 is located at the bottom of the filter pool 15, the pickled mustard greens 153 are located on the filter media 151, and the drain outlet 152 is located at the bottom of the filter pool 15 near the sea.

[0034] In one specific embodiment, the drain outlet 152 is equipped with a check valve, allowing unidirectional flow from the filter pool 15 to the artificial reef area.

[0035] In one specific embodiment, a buffer zone 17 is provided between the filter pool 15 and the artificial reef area.

[0036] In one specific embodiment, the surface of the first artificial reef 21 is provided with multiple holes and grooves.

[0037] In one specific embodiment, the first artificial reef 21 is a cube or a triangular prism.

[0038] In one specific embodiment, the first artificial reef 21 has at least two rows, with the two adjacent rows staggered left and right.

[0039] In one specific embodiment, the angle between the backflow baffle 212 and the cross section of the channel 211 is 20-50°, and the backflow baffle 212 is fixed to the channel 211 in the direction near the coast by a rotatable device.

[0040] In one specific embodiment, the rotatable device is provided with a torsion spring.

[0041] In one specific embodiment, the mangrove forest includes Kandelia candel 31, Ficus pumila 32 and Lepidium apetalum 33, with Kandelia candel 31 located near the coast, Ficus pumila 32 located in the middle, and Lepidium apetalum 33 located near the nearshore area.

[0042] In one specific embodiment, the structure of the second artificial reef 34 is the same as that of the first artificial reef 21.

[0043] In one specific embodiment, a pine pile cofferdam is set up around the mangrove forest.

[0044] Plant replacements can be flexibly selected based on specific environmental parameters of the intertidal zone (salinity, topography, pollution type, budget).

[0045] Specifically, this utility model provides a system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of a coast, comprising: (1) Module 1 Ecological Ditch Area: Ecological Ditch Area for Pollution Reduction at Landside Sources Structural Design: The slope is protected using geotextile / ecological bags 13 (ecological bags filled with planting soil and biochar) to prevent erosion and collapse; salt-tolerant and flood-resistant plants are selected, with *Gnaphalium affine* 11 planted in the emergent layer (coastal area) (row spacing 0.3-0.5m, plant spacing 0.2-0.3m), and *Arundo donax* 12 planted on the slope (plant spacing 0.4m), whose roots adsorb nitrogen, phosphorus, and heavy metals. A ditch is constructed along the intertidal landward drainage path, 100-500m long (along the coastline), 2-3m wide, and 0.8-1.2m deep; the ditch is constructed from high to low in one direction, with a sedimentation tank 14 (5-8m³ volume) at the end (low-lying end), equipped with a sludge discharge port 141 at the bottom of the tank and an adjustable valve. The settled sludge is cleaned once a month during low tide to ensure unobstructed drainage. An outlet 142 is located in the upper part of the sedimentation tank 14, into which the supernatant is injected into a filtration tank 15. The filter pool 15 is located on the nearshore side of the sedimentation pool 14. The bottom is covered with a 15-20cm thick biochar-zeolite composite filter media 151 (biochar-zeolite ratio 1:1) to enrich salt-tolerant microorganisms (such as Haloxylon ammodendron and Pseudomonas aeruginosa) to enhance the degradation of organic matter. The submerged layer is planted with Potamogeton crispus 153 (coverage rate 60%-70%) to absorb nutrients in the water. The bottom of the filter pool 15 is provided with a drain outlet 152 near the nearshore side. The filter pool 15 is also provided with a water retaining wall 16 (0.2m) near the nearshore side to reduce the impact of waves and the backflow of seawater during low tide. The nearshore side of the filter pool 15 is provided with a buffer zone 17, which is 50-100m long.

[0046] Working principle: Land-based sewage enters the ditch with coastal surface runoff and collects in sedimentation tank 14. The supernatant after sedimentation flows into filtration tank 15, and after filtration, it flows through buffer zone 17 into the artificial reef area of ​​module two. The roots of *Phragmites australis* and *Arundinaria florida* adsorb nitrogen, phosphorus, and heavy metals; the sedimentation tank intercepts insoluble pollutants; *Potamogeton crispus* absorbs nutrients from the water; and the composite filter media and attached microorganisms degrade organic matter. Before the treated sewage enters the artificial reef area in the intertidal core zone, the total nitrogen removal rate is ≥50%, and the suspended solids removal rate is ≥75%, effectively reducing the pollution load in the intertidal zone and achieving both pollution reduction and sedimentation enhancement functions. A retaining wall prevents seawater backflow.

[0047] (2) Module 2 Artificial Reef Area: Intertidal Core Area Purification and Protection - Artificial Reef Area with Integrated Magnetic Bacterial Agent The first artificial reef 21 is designed using precast C30 marine concrete (resistant to seawater corrosion, compressive strength ≥30MPa), forming a cube or triangular prism structure (side length / height 1.5-2m). Multiple holes and grooves are retained on the surface (to increase the surface area for biological attachment). Multiple interconnected microbial agent channels 211 with a diameter of 8-10cm are added internally. These channels 211 extend from the coast towards the nearshore area. A 316L stainless steel filter screen 214 (2mm aperture) is installed on the nearshore side of the channel 211, while a backflow baffle 212 is installed on the nearshore side. The angle between the backflow baffle 212 and the cross-section of the channel 211 is 30°. The backflow baffle 212 is hinged to the channel 211 on the coastal side (the hinge is equipped with a torsion spring, so the backflow baffle is closed when there are no waves), preventing the microbial agent from being lost with the waves. Porous carbon 213 loaded with magnetic microbial agent is filled into the microbial agent channels 211 (filling volume is 70%-80% of the channel volume).

[0048] The magnetic bacterial agent adopts an existing structure, including a core-shell structure of "Fe3O4@SiO2-chitosan" (Fe3O4 particle size 50-100nm, SiO2+chitosan coating layer thickness 20-30nm), loaded with salt-tolerant degrading bacteria (Pseudomonas + Oligotrophosporium, ratio 1:1). The chitosan coating layer enhances the binding force between the bacterial agent and the carrier, reducing tidal erosion loss. The porous carbon is porous biochar domesticated with seawater (specific surface area 150-200m² / g), with a bacterial agent loading of 5%-8%.

[0049] The first artificial reef layout method: On the nearshore side of buffer zone 17, triangular prism reefs are arranged in four staggered rows with a spacing of 2-5m between them, forming a protective and purification zone, achieving seamless connection between the ditches and the reefs, and strengthening the degradation of tidal backflow pollution.

[0050] Working principle: During high tide, the polluted water carried by the tide mixes with the pre-treated water flowing out of the filtration pool. During low tide, the polluted water passes through the holes in the reef and the bacterial agent channel, making full contact with the magnetic bacterial agent. The bacterial agent efficiently degrades organic matter (COD degradation rate ≥80%) and converts nitrogen and phosphorus (nitrogen and phosphorus removal rate ≥60%). The stainless steel filter screen and backflow baffle reduce the loss of bacterial agent, extending the activity period of the bacterial agent to 6-8 months. At the same time, the reef's own structure resists tidal erosion, reducing wave height by 40%-60%, playing a protective role and taking into account both pollution reduction and disaster response functions.

[0051] (III) Module 3 Mangrove Area: Seaside Sedimentation Enhancement and Protection - Artificial Reefs and Mangroves Mangrove planting configuration: Select wave-resistant and salt-tolerant native mangrove species and plant Kandelia candel 31 (50-60cm tall, 1-1.2m spacing), Aristolochia mangifera 32 (40-50cm tall, 0.8-1m spacing), and Lepidium apetalum 33 (40-50cm tall, 0.2-0.4m spacing) on ​​the nearshore side (mid-tide zone) of the artificial reef area. The ratio of Kandelia candel 31, Aristolochia mangifera 32, and Lepidium apetalum 33 should be 5:2:3 (the specific ratio needs to be adjusted according to different regions and community structures; this example is the Zhuhai area). The Kandelia candel planting area should be close to the artificial reef area, the Aristolochia mangifera planting area should be in the middle, and the Lepidium apetalum should be on the side of the Aristolochia mangifera planting area away from the coast. Before planting, apply a compound soil conditioner (10t / ha biochar + 3t / ha humic acid) to the substrate to reduce soil salinity (electrical conductivity ≤500μS / cm) and improve seedling survival rate.

[0052] Collaborative protection design: On the outer side of the mangrove forest (low tide zone), a second artificial reef 34 with integrated microbial agents is deployed (spaced 2-5m apart, the structure of the second artificial reef 34 is the same as the first artificial reef 21), forming a "double-layer protection-capacity enhancement" system with the inner reef and mangrove forest; at the same time, pine pile dikes are set up around the mangrove planting area to further slow down the water flow and protect the growth of seedlings.

[0053] Working principle: Mangroves fix the bottom sediment through their extensive root systems, reducing sediment resuspension, absorbing residual nitrogen and phosphorus in seawater, and fixing carbon dioxide through photosynthesis (increasing carbon sequestration capacity by 30%-50% compared to the original single mangrove forest); the outer reef further reduces storm surge wave height (residual wave height reduction ≥20%), providing wave-resistant shelter for mangroves and increasing seedling survival rate to ≥80%; at the same time, the reef pores and mangrove roots provide habitat for marine life, promoting biodiversity and forming a synergistic effect of "disaster response-carbon sequestration-ecological restoration".

[0054] The *Gnaphalium affine* first filters high-salinity seawater and pollutants (such as heavy metals and nitrogen and phosphorus from aquaculture wastewater) from the nearshore area, reducing the salinity to below 20‰, thus creating a suitable growing environment for the inner *Symplocos cuspidata* and *Kandelia candel*. The tall canopies of the *Kandelia candel* and *Symplocos cuspidata* can block strong sunlight, preventing the leaves of the *Gnaphalium affine* from being scorched by high summer temperatures (such as the average temperature of 30℃+ in Shenzhen in July and August), forming a mutually beneficial microenvironment.

[0055] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present utility model.

Claims

1. A system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of a coast, characterized in that: From the coast towards the nearshore area, it includes, in sequence, an ecological ditch area, an artificial reef area, and a mangrove area; From the coastline toward the nearshore direction, the ecological ditch area includes an ecological revetment, a ditch and a filtration pond (15). A sedimentation pond (14) is located at the end of the ditch, and the filtration pond (15) is located on the nearshore side of the sedimentation pond (14). A water retaining wall (16) is provided near the nearshore direction of the filtration pond (15). The artificial reef area includes multiple first artificial reefs (21); the first artificial reef (21) has a channel (211) inside from the coast to the nearshore direction, the channel (211) is equipped with a stainless steel filter (214) near the nearshore direction, the channel (211) is equipped with a backflow baffle (212) near the coast, the backflow baffle (212) can be opened and closed with the tide, closed during high tide and opened during low tide, and the channel (211) is filled with porous carbon (213) loaded with magnetic bacterial agent. From the coast toward the nearshore direction, the mangrove area includes mangroves and a second artificial reef (34).

2. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 1, characterized in that, The ecological revetment includes geotextile / ecological bags (13), windmill grass (11) and variegated reed (12). The geotextile / ecological bags (13) serve as the slope, the windmill grass (11) is planted on the coast, and the variegated reed (12) is planted on the slope.

3. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 1, characterized in that, The sedimentation tank (14) includes an outlet (142) and a sludge discharge outlet (141), and the outlet (142) is connected to the filter tank (15).

4. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 1, characterized in that, The filter pool (15) includes filter media (151), sedge (153) and drain outlet (152). The filter media (151) is located at the bottom of the filter pool (15), the sedge (153) is located on the filter media (151), and the drain outlet (152) is located at the bottom of the filter pool (15) near the sea.

5. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 4, characterized in that, The drain outlet (152) is equipped with a check valve; A buffer zone (17) is provided between the filtration pool (15) and the artificial reef area.

6. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 1, characterized in that, The surface of the first artificial reef (21) has multiple holes and grooves; The first artificial reef (21) is a cube or a triangular prism; The first artificial reef (21) has at least two rows, with the two adjacent rows staggered left and right.

7. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 6, characterized in that, The angle between the backflow baffle (212) and the cross section of the channel (211) is 20-50°; the backflow baffle (212) is fixed to the channel (211) in the direction close to the coast by a rotatable device.

8. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 7, characterized in that, The rotatable device is equipped with a torsion spring.

9. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 1, characterized in that, Mangrove forests include Kandelia candel (31), Ficus microcarpa (32) and Lepidium apetalum (33). Kandelia candel (31) is located near the coast, Ficus microcarpa (32) is located in the middle, and Lepidium apetalum (33) is located near the sea.

10. The system for pollution reduction, sedimentation enhancement, and disaster response in the intertidal zone of the coast according to claim 1, characterized in that, A pine stake dike was set up around the mangrove forest.

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