A flexible ecological revetment structure for reservoir drawdown zone and a construction method thereof

Abstract

The application discloses a kind of flexible ecological revetment structure for reservoir drawdown zone and its construction method, belong to revetment structure technical field.The structure includes at least one sealed bag unit, sealed bag unit includes sealed bag, dry shrinkage zone and pre-tear line.Sealed bag is made of waterproof degradable material, inside encapsulation has plant seed and dry growth medium, overall density is greater than water.Dry shrinkage zone both ends are hung to the outer surface of sealed bag, shrink when losing water.Pre-tear line is located in the side of sealed bag.When construction, multiple units are put into drawdown zone bank slope surface in wet season, and flexible revetment layer is formed to resist scouring;after water level drops, dry shrinkage zone loses water and shrinks, and pre-tear line is torn, and seed and medium are released;seed germination forms vegetation, and root system is reinforced and solidified.The application makes revetment function and water level change self-adapting cooperation, realizes engineering revetment and ecological restoration integration, construction efficiency is higher, and it is suitable for large-area reservoir drawdown zone bank slope protection.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering and reservoir ecological restoration technology, specifically relating to a flexible ecological revetment structure and its construction method for slope protection and ecological restoration in the drawdown zone of a reservoir. Background Technology

[0002] The drawdown zone of a reservoir is a unique area where water and land alternate due to the periodic rise and fall of water levels, making bank slope protection and ecological restoration quite challenging. This area faces problems such as bank slope instability, soil erosion, and the poor adaptability of traditional bank protection structures.

[0003] Currently, two main types of technologies are used for the management of drawdown zones: Category 1: Rigid bank protection structures, such as concrete grids, masonry revetments, and gabions. While these structures can stabilize bank slopes in the short term, they suffer from drawbacks such as poor ecological compatibility, obstruction of water-land material exchange, difficulty in adapting to deformation caused by water level fluctuations, high construction costs, and unsightly appearance.

[0004] The second category is flexible revetment structures, such as geotextile bags and eco-bags. These structures have certain ecological benefits, but they still require on-site filling and stacking, resulting in low construction efficiency. Furthermore, they lack an automatic vegetation restoration mechanism that is linked to water level changes, requiring artificial planting or natural regeneration of vegetation, with survival rates affected by the duration of flooding.

[0005] Furthermore, traditional vegetation restoration methods—artificial planting during low water levels—require irrigation systems, but these systems are easily destroyed by water flow during high water periods; direct sowing during high water levels results in seed drift and a low planting rate. The intensity of flooding stress varies significantly across different elevation drawdown zones, necessitating an integrated bank protection and vegetation restoration technology that can coordinate with the water level receding process.

[0006] Therefore, it is necessary to develop an ecological revetment structure and its construction method that can both provide flexible revetment functions and adapt to water level changes while reducing the need for subsequent human intervention. Summary of the Invention

[0007] This invention provides a simple structure that can be deployed in batches and has both flexible bank protection and ecological restoration functions, as well as its construction method, to overcome the problems of poor ecological compatibility of existing rigid bank protection structures, lack of automatic vegetation restoration function of flexible bank protection structures, and reliance on manual labor and difficulty in coordinating with water level rhythms in traditional vegetation restoration technologies.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A flexible ecological revetment structure for the drawdown zone of a reservoir includes at least one sealed bag unit, which constitutes the basic revetment component of the flexible ecological revetment structure. The sealed pouch unit includes: The sealed bag is made of waterproof and biodegradable material and contains plant seeds and dry growth medium. The overall density of the sealed bag is greater than that of water, so that it can sink to the bottom of the water during the high water season and be stacked on the surface of the drawdown zone to form a flexible covering layer that resists water erosion. At least one drying shrink tape is provided, with connecting holes at both ends of the drying shrink tape. The outer surface of the sealed bag is provided with connecting ears that match the connecting holes. The drying shrink tape is hung on the connecting ears through the connecting holes. The drying shrink tape has the characteristic of shrinking in a dehydration environment. A pre-tear line is provided on the side of the sealed bag; When the water level drops and the sealed bag unit is exposed above the water surface, the drying shrinkage zone shrinks due to water loss, applying a tearing force to the pre-tear line, thereby tearing the sealed bag open and releasing the internal growth medium and seeds onto the drawdown slope surface to form a vegetation layer to further reinforce the slope.

[0009] Furthermore, the number of the sealed bag units is multiple, which are connected in series to form a strip revetment component. The strip revetment component is arranged along the contour line of the drawdown zone slope to form a flexible revetment strip parallel to the water level line.

[0010] Furthermore, the number of the strip revetment components is multiple, which are interconnected by transverse connecting cables to form a mesh revetment mat. The mesh revetment mat is integrally attached to the surface of the bank slope to form a continuously covered flexible revetment layer.

[0011] Furthermore, the top and bottom surfaces of the sealed bag are provided with the drying shrinkage strip.

[0012] Furthermore, the material of the drying shrink tape is polyvinyl alcohol.

[0013] Furthermore, the sealed bag is made of photodegradable or oxygen-degradable plastic.

[0014] Furthermore, the pre-tear line is a localized area of ​​reduced strength formed by an indentation process.

[0015] A construction method for the above-mentioned flexible ecological revetment structure includes the following steps: S1: Unit prefabrication: Prepare multiple sealed bag units, each sealed bag unit having an overall density greater than water, and encapsulating flood-resistant plant seeds and dry growth medium inside; S2: Deployment: During the high water period of the reservoir, multiple sealed bag units are deployed to the bank slope surface of the target area of ​​the drawdown zone. The sealed bag units sink to the bottom of the water and accumulate on the bank slope surface or are spread out through connectors to form a flexible bank protection layer covering the bank slope. S3: Bank protection maintenance: During the high water season, the flexible bank protection layer covers and compacts the soil on the bank slope surface to resist water erosion and inhibit soil and water loss on the bank slope. S4: Trigger Release: When the reservoir water level drops and the sealed bag unit is exposed above the water surface, the drying shrinkage strip on the sealed bag generates a shrinkage force due to water loss and drying. This shrinkage force is transmitted along the surface of the sealed bag to the pre-tear line, tearing the sealed bag and releasing the internal growth medium and seeds to the bank slope surface. S5: Vegetation reinforcement: Seeds germinate and grow using the released growth medium and surface water of the bank slope, forming a vegetation cover layer. The vegetation roots penetrate deep into the bank slope soil, further reinforcing and stabilizing the soil, and enhancing the overall stability of the bank slope.

[0016] Furthermore, in the S2 deployment step, multiple sealed bag units are connected in series by biodegradable connecting cables to form a strip revetment assembly, or multiple strip revetment assemblies are connected by transverse connecting cables to form a mesh revetment mat, which is then deployed as a whole onto the surface of the drawdown zone slope.

[0017] Furthermore, in the S4 trigger release step, the sealed bag units at different elevations are triggered sequentially according to the time they emerge from the water surface. The units at higher elevations are triggered first and release seeds first, while the units at lower elevations are triggered later and release seeds later, thus forming a tiered planting of vegetation.

[0018] Compared with the prior art, the technical advantages of the present invention are as follows:

[0019] Bank protection performance: During the high-water season, this structure forms a flexible cover layer that directly resists water erosion and reduces soil loss from the bank slope. Compared with rigid bank protection, it has flexible deformation capabilities and can adapt to bank slope settlement.

[0020] Ecological function: During the dry season, seeds are automatically released to form vegetation, and the root system of the vegetation and the flexible cover layer together form a protective system.

[0021] Adaptive water level change: Utilizing the humidity response characteristics of the drying contraction zone, the system automatically converts water level drops into a trigger for seed release, reducing human intervention. Different elevation units trigger the release in stages, coordinating with the reservoir's receding water process.

[0022] Construction efficiency: The modules can be prefabricated, and the vessels can be deployed at once during the high water season. They automatically sink to the bottom and position themselves, requiring no complicated installation or subsequent maintenance. They are suitable for large areas with significant elevation differences in the drawdown zone.

[0023] Environmentally friendly: The sealed bag is made of biodegradable material and gradually degrades after being exposed to water; the double-sided shrinkage band improves trigger reliability. Attached Figure Description

[0024] Figure 1 This is a front view schematic diagram of the overall structure of the sealing bag unit in one embodiment of the present invention.

[0025] Figure 2 This is a cross-sectional view of the sealing bag unit in one embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of a flexible revetment strip.

[0027] Figure 4 This is a schematic diagram of a flexible revetment layer structure.

[0028] In the diagram: 10. Sealed bag, 11. Connecting ear, 20. Growth medium, 30. Plant seed, 40. Drying shrinkage strip, 41. Connecting hole, 50. Pre-tear line, 60. Connecting cable, 70. Strip revetment component, 80. Lateral connecting cable, 90. Mesh revetment mat. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and embodiments. The described embodiments are for illustrative purposes only and do not constitute a limitation on the scope of protection.

[0030] Example 1: Structural Composition and Density Control Method of Sealed Bag Unit

[0031] like Figure 1 , Figure 2 As shown, this embodiment provides a sealing bag unit, including a sealing bag 10, a growth medium 20, plant seeds 30, a drying shrink tape 40, and a pre-tear line 50.

[0032] The sealed bag 10 is made of a waterproof and biodegradable plastic film, which can be either photodegradable or oxygen-degradable. This material maintains good mechanical properties while submerged in water and gradually degrades under natural sunlight after being exposed to the water surface.

[0033] The growth medium 20 is made by mixing and drying coconut shell fiber, well-rotted organic fertilizer, and fine sand in an appropriate ratio. By adjusting the proportion of fine sand, the bulk density of the growth medium 20 is made greater than that of water, ensuring that the overall density of the sealed bag is greater than that of water. In addition to fine sand, diatomaceous earth, bentonite, or vermiculite can also be used as high-density fillers.

[0034] The plant seeds are selected from 30 flood-tolerant plant varieties adapted to the local drawdown zone environment, such as Bermuda grass, oxtail grass, and reeds. The seeds are sterilized and dried before packaging to reduce the moisture content to a low level to prevent mold or premature germination during storage.

[0035] Regarding the preparation and installation of the drying shrink tape 40: The drying shrinkage tape 40 is made of polyvinyl alcohol (PVA), specifically selected from PVA foam or PVA film. PVA materials have excellent water absorption and swelling and water loss shrinkage properties. The shrinkage mechanism is as follows: PVA molecular chains contain a large number of hydroxyl groups. In the dry state, hydrogen bonds form between the molecular chains, resulting in a tight arrangement. After absorbing water, water molecules enter between the molecular chains, weakening the hydrogen bonds, increasing the inter-chain spacing, and causing the material to expand. After water loss, the hydrogen bonds reform, the molecular chains shrink, and the material volume decreases. In this embodiment, PVA foam with a thickness of 2-5 mm is selected and cut into strips 50 mm long and 10 mm wide, with a drying shrinkage rate of 20%-40%.

[0036] Connection holes 41 are provided at both ends of the drying shrink tape 40. The shape of the connection holes 41 matches the connection ears 11 on the packaging bag 1, and can be round holes, oblong holes, or slits. The size of the connection holes 41 is slightly larger than the cross-sectional size of the connection ears 11 to facilitate the hanging operation, but the gap should not be too large to prevent them from falling off.

[0037] The installation process of the shrink-wrap tape 40 is carried out in a moist state: First, immerse the shrink-wrap tape 40 in clean water to allow it to fully absorb water and expand to its maximum volume; then, align the connecting holes 41 at both ends of the shrink-wrap tape 40 with the corresponding connecting ears 11 on the packaging bag 1, and insert the connecting ears 11 into the connecting holes 41 to complete the connection. During installation, pay attention to the installation direction of the shrink-wrap tape 40 to ensure that its shrinkage direction is consistent with the stress direction of the structural weakening line 5.

[0038] This connection method can be installed in a wet state, meeting the initial state requirements of the dry shrink tape 40; in addition, installation does not require heating, avoiding damage to the polyvinyl alcohol material from high temperatures, and is easy to install, making it suitable for industrial mass production.

[0039] The pre-tear line 50 is formed by an indentation process. Pressure is applied to the film surface of the sealed pouch 10 using a heated indentation die, reducing the material thickness and strength in this area while maintaining material continuity and preventing through-holes. The tear strength of the indented area is lower than that of the unindented area.

[0040] Working principle: During the high-water season, the units sink to the bottom, and multiple units accumulate to form a flexible cover layer. During underwater immersion, the sealing bag 10 remains sealed, and the drying shrinkage belt 40 remains moist and expanded, without generating shrinkage force. As the water level drops and the units emerge from the water, the drying shrinkage belt 40 loses water and shrinks, generating shrinkage force along its length. This shrinkage force is transmitted to the sealing bag 10 through the connecting lugs 11 at both ends and concentrates at the pre-tear line 50. When the shrinkage force exceeds the tear strength of the pre-tear line 50, the pre-tear line 50 tears, the sealing bag 10 is opened, and the internal growth medium 20 and seeds 30 are released onto the bank surface. The growth medium 20 absorbs water and expands, and the seeds 30 germinate to form vegetation.

[0041] Example 2: Formation and Contour Line Layout Method of Strip Revetment Components

[0042] like Figure 3 As shown, multiple sealed bag units are connected in series at appropriate intervals via biodegradable connecting cables 60 to form a strip-shaped revetment component 70. The interval can be adjusted according to the designed planting density and revetment requirements, for example, set to 30-80 cm. The connecting cables 60 can be made of biodegradable polyester thread.

[0043] During deployment, the strip revetment components 70 are laid out along the contour lines of the drawdown zone slope, forming flexible revetment strips parallel to the water level. A vessel travels along the predetermined elevation line and slowly lowers the components into the water, allowing them to sink naturally. Since the overall density of the unit is greater than water, the components sink vertically and adhere to the slope surface. In areas with steeper slopes, the connecting cables 60 between the units are tensioned by gravity, ensuring the components conform to the slope as a whole.

[0044] Multiple strip-shaped revetment components 70 can be deployed along different elevations to form multi-level protective strips. During the high-water season, all strips are submerged underwater to jointly resist water erosion; during the low-water season, as the water level drops, the strips with higher elevations emerge above the water surface first and trigger the erosion process, while the strips with lower elevations emerge later and trigger the erosion process, thus achieving tiered vegetation restoration.

[0045] The revetment functions of the strip revetment component 70 include: the weight of the unit itself compacts the surface soil and inhibits the initiation of soil particles; the connecting cables 60 between units form constraints and limit the lateral displacement of the soil; the rough structure on the surface of the unit increases the flow resistance, reduces the near-bottom flow velocity, and reduces scouring.

[0046] Example 3: Overall protective structure of mesh revetment mat

[0047] like Figure 4 As shown, multiple strip revetment components 70 are connected at nodes by transverse connecting cables 80 to form a mesh revetment mat 90. Specific operation: First, prepare multiple strip revetment components 70 according to Example 2, with each component unit having the same spacing; then, lay the multiple components parallel to each other, with the spacing similar to the unit spacing, aligning the unit positions on each component; use transverse connecting cables 80 to bind and fix the connecting ears 11 or connecting cables 60 of corresponding units on adjacent components.

[0048] The connected mesh revetment mat 90 forms a grid pattern. The grid size can be adjusted as needed to match the designed planting density. The mesh revetment mat 90 can be rolled up for transportation and storage. During deployment, the roll is placed at the stern of a boat, which travels along the contour lines, and the mat is unrolled and laid on the water surface, allowing it to sink naturally. After sinking, the mat units connect to each other, providing good overall resistance to water flow impact.

[0049] Compared to rigid revetments such as masonry slope protection and concrete grid, the mesh revetment mat 90 can bend with slight deformation of the bank slope, without blocking the exchange of substances between water and land, and vegetation roots can grow through the mesh. Compared to traditional flexible revetments such as geotextile bags and eco-bags, the mesh revetment mat 90 of this invention is prefabricated in the factory, requires no on-site filling or stacking, and has an automatic vegetation triggering function.

[0050] Example 4: Reliability Design of Double-Sided Shrink Tape

[0051] The orientation of the sealed bag unit after sinking to the bottom of the water is random. If the drying shrinkage strip 40 is only set on one side, when that side is facing down, the shrinkage strip is pressed to the bottom and in contact with the moist soil, which may result in slower drying and affect triggering.

[0052] In this embodiment, drying shrink wraps 40 are fixed to both the top and bottom surfaces of the sealed bag 10. Specifically, connecting ears 11 are provided on the upper and lower surfaces of the bag body, and one drying shrink wrap 40 is attached to each. When the unit emerges from the water, regardless of the unit's orientation, one side of the drying shrink wrap 40 is always exposed to the air, allowing for faster water loss, drying, and shrinkage. Although the other side of the shrink wrap dries more slowly, since both shrink wraps are connected to the same bag body, sufficient shrinkage force from one side is enough to tear the pre-tear line 50. This design helps improve triggering reliability. Furthermore, when both sides shrink simultaneously, the tension directions are opposite, creating opposing tension on the bag body, which is beneficial for tearing at the pre-tear line 50.

[0053] Example 5: Alternatives to Different Materials

[0054] In addition to photodegradable plastics, the sealed bag 10 can also use oxygen-degradable plastics (such as polyethylene film with added oxidants), which are stable during submersion and gradually degrade after being exposed to the water surface. Biodegradable plastics such as polylactic acid (PLA), polybutylene terephthalate adipate (PBAT), or starch-based composite plastics can also be used.

[0055] In addition to polyvinyl alcohol foam, drying shrink tape 40 can also be made of materials with water loss shrinkage properties such as superabsorbent resin and fiber composite sheets, cellulose-based hydrogel sheets, and natural rubber.

[0056] In addition to fine sand, the high-density filler in the growth medium 20 can be diatomaceous earth, bentonite, vermiculite or slag powder, etc.

[0057] Example 6: Step-by-step triggering and vegetation reinforcement at different water levels

[0058] Taking the Three Gorges Reservoir area as an example, the drawdown zone elevation ranges from 145m to 175m. Based on the duration of flooding, the drawdown zone can be roughly divided into a high water level zone (170m-175m), a medium water level zone (155m-170m), and a low water level zone (145m-155m). During deployment, sealed bags containing seeds of corresponding flood-tolerant plants are placed in the corresponding elevation sections. Tree and shrub seeds can be placed in the high water level zone, flood-tolerant herbaceous and shrub seeds in the medium water level zone, and highly flood-tolerant herbaceous seeds in the low water level zone.

[0059] The decline in reservoir water levels typically begins in autumn and lasts for several months. During this process, units at higher elevations emerge first, and the drying and shrinking zone (40°C) triggers seed release. Units at lower elevations emerge later and are triggered later. Each triggered seed release utilizes the residual moisture in the bank slope soil to germinate, completing seedling establishment before winter. Due to the different trigger times at different elevations, vegetation recovery exhibits a tiered pattern.

[0060] After vegetation forms, its root system reinforces and stabilizes the soil on the bank slope. According to relevant studies, the root systems of grasses such as Bermuda grass are densely distributed in the soil, with a root length density of 15-20 roots / cm². The shear strength of soil covered by vegetation can be increased by 30%-40% compared to bare slopes. Furthermore, the above-ground parts of the vegetation can reduce wave energy and minimize direct impact on the bank slope when flood season arrives again.

[0061] The sealed bag material 10 gradually degrades after being exposed to water. Taking photodegradable polyethylene as an example, under natural light conditions, the film cracks after several months, then becomes brittle and disintegrates, eventually decomposing into low molecular weight products that are utilized by soil microorganisms without producing toxic or harmful substances.

[0062] Examples of on-site construction methods

[0063] Construction preparation phase: Topographic surveying is conducted on the target drawdown zone to determine the bank slope, elevation zones, and area. Based on the designed vegetation type and plant density, the required number of sealing bag units and their allocation at each elevation are calculated. Sealing bag units are prefabricated in the factory and packaged according to elevation zones. As needed, the units are strung together to form strip revetment components 70 or connected to form mesh revetment mats 90, rolled up, and secured with biodegradable ropes.

[0064] Deployment Operation: Transport the prefabricated modules to the reservoir dock and transfer them to the deployment vessel. Deployment should be carried out during the reservoir's high-water season (when the water level is close to the highest point). The vessel travels along the design elevation line, slowly lowering the modules into the water from the stern or side. For strip-shaped components, the line is laid out while the vessel is moving; for mesh mattresses, one end can be anchored to the top of the bank slope first, then the vessel travels away from the bank slope, unfolding the mattress and allowing it to sink naturally. Avoid overlapping or knotting the modules during deployment. After deployment, the module positions can be randomly checked; if there is a significant deviation, adjustments can be made using rope traction.

[0065] Post-flood management: Regularly inspect the area during the receding flood season to observe the module triggering status and vegetation germination. If any modules fail to trigger, manually turn them over to allow them to dry. Since the slope soil remains moist after the floodwaters recede when triggered, the seeds generally require sufficient water for germination and do not require artificial irrigation. The tiered triggering mechanism helps vegetation recover naturally. If vegetation cover is insufficient in certain areas due to erosion, modules can be added during the following year's high-water season.

[0066] Compared with traditional bank protection construction methods, the construction method of this invention has a high degree of prefabrication and requires less on-site work, making it particularly suitable for drawdown zone management projects with tight schedules and large areas.

[0067] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexible ecological revetment structure for the drawdown zone of a reservoir, characterized in that: It includes at least one sealed bag unit, which constitutes the basic revetment component of the flexible ecological revetment structure. The sealed pouch unit includes: The sealed bag is made of a waterproof and biodegradable material and contains plant seeds and a dry growth medium. The overall density of the sealed bag is greater than that of water. At least one drying shrink tape, wherein the drying shrink tape has connection holes at both ends, and the outer surface of the sealing bag has connection ears that match the connection holes, and the drying shrink tape is hung on the connection ears through the connection holes; A pre-tear line is provided on the side of the sealed bag; When the drying shrinkage tape shrinks in a dry environment, it applies tension to the pre-tear line to tear open the sealed bag.

2. The flexible ecological revetment structure for the drawdown zone of a reservoir according to claim 1, characterized in that: The number of sealed bag units is multiple, which are connected in series to form a strip revetment component. The strip revetment component is arranged along the contour line of the drawdown zone slope to form a flexible revetment strip parallel to the water level line.

3. A flexible ecological revetment structure for the drawdown zone of a reservoir according to claim 2, characterized in that: The strip revetment components are multiple in number and are interconnected by transverse connecting cables to form a mesh revetment mat. The mesh revetment mat is integrally attached to the surface of the bank slope to form a continuous and flexible revetment layer.

4. A flexible ecological revetment structure for the drawdown zone of a reservoir according to claim 1, characterized in that: The top and bottom surfaces of the sealed bag are provided with the drying shrinkage strip.

5. A flexible ecological revetment structure for the drawdown zone of a reservoir according to claim 1, characterized in that: The material of the drying shrink tape is polyvinyl alcohol.

6. A flexible ecological revetment structure for the drawdown zone of a reservoir according to claim 1, characterized in that: The sealed bag is made of photodegradable or oxygen-degradable plastic.

7. A flexible ecological revetment structure for the drawdown zone of a reservoir according to claim 1, characterized in that: The pre-tear line is a localized area of ​​reduced strength formed by an indentation process.

8. A construction method for a flexible ecological revetment structure as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Unit prefabrication: Prepare multiple sealed bag units, each sealed bag unit having an overall density greater than water, and encapsulating flood-resistant plant seeds and dry growth medium inside; S2: Deployment: During the high water period of the reservoir, multiple sealed bag units are deployed to the bank slope surface of the target area of ​​the drawdown zone. The sealed bag units sink to the bottom of the water and accumulate on the bank slope surface or are spread out through connectors to form a flexible bank protection layer covering the bank slope. S3: Bank protection maintenance: During the high water season, the flexible bank protection layer covers and compacts the soil on the bank slope surface to resist water erosion and inhibit soil and water loss on the bank slope. S4: Trigger Release: When the reservoir water level drops and the sealed bag unit is exposed above the water surface, the drying shrinkage strip on the sealed bag generates a shrinkage force due to water loss and drying. This shrinkage force is transmitted along the surface of the sealed bag to the pre-tear line, tearing the sealed bag and releasing the internal growth medium and seeds to the bank slope surface. S5: Vegetation reinforcement: Seeds germinate and grow using the released growth medium and surface water of the bank slope, forming a vegetation cover layer. The vegetation roots penetrate deep into the bank slope soil, further reinforcing and stabilizing the soil, and enhancing the overall stability of the bank slope.

9. The construction method of the flexible ecological revetment structure according to claim 8, characterized in that: In the S2 deployment step, multiple sealed bag units are connected in series by biodegradable connecting cables to form a strip revetment assembly, or multiple strip revetment assemblies are connected by transverse connecting cables to form a mesh revetment mat, which is then deployed as a whole onto the surface of the drawdown zone slope.

10. The construction method of the flexible ecological revetment structure according to claim 8, characterized in that: In the S4 trigger release step, the sealed bag units at different elevations are triggered sequentially according to the time they emerge from the water surface. The units at higher elevations are triggered first and release seeds first, while the units at lower elevations are triggered later and release seeds later, forming a tiered planting of vegetation.

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