Method for ecological restoration of water in semi-closed lake

Abstract

The application relates to a semi-closed lake water ecological restoration method applied to the field of water treatment, which realizes ecological restoration of the semi-closed lake by constructing a lake water ecological system, environmental protection dredging and silt treatment, and composite ecological revetment and estuary wetland and water system interconnection regulation, so that water transparency is improved, and a replicable highland lake ecological restoration technical system is formed; in addition, under the action of the composite revetment structure of'mechanical support + anti-seepage + ecological buffer', the lake bank is effectively protected, the bank slope erosion resistance is improved, internal water and soil are effectively maintained, water and soil loss is not prone to occur, meanwhile, under the action of the loosening monitoring unit, the stability of the composite revetment structure can be effectively monitored; when water and soil loss occurs due to excessive erosion of the revetment, the situation can be found out in time, so that the staff can timely maintain, and the abnormal range of the bank is prevented from continuously expanding.

Description

Technical Field

[0001] This invention relates to a lake water restoration method, and more particularly to a semi-enclosed lake water ecological restoration method applied in the field of water treatment. Background Technology

[0002] A semi-enclosed lake is a body of water with minor tributaries flowing into or out of it, but which remains relatively isolated from the surrounding waters. These lakes are typically formed by geological activity or siltation and exhibit seasonal closure. Typical characteristics are as follows:

[0003] Hydrological characteristics: The water level is affected by the dynamic balance of replenishment and discharge, mainly by rainfall and groundwater replenishment, and is connected to the outside world through passes or tributaries.

[0004] Ecological structure: The water body has weak flow, resulting in stratification of water temperature and dissolved oxygen, commonly with upper lake layer, lower lake layer and variable temperature layer structure.

[0005] Causes of formation: Mostly formed by geological activities or the separation of the ocean and land, such as marine lakes formed by the accumulation of silt.

[0006] Currently, domestic and international ecological restoration technologies for semi-enclosed lakes mostly focus on simple dredging or planting, lacking systematic research on the special hydrological conditions of subtropical mountain lakes. For example, Chinese patent CN112979104A discloses a restoration system and method for the ecological restoration of polluted water quality in large rivers and lakes, and Chinese patent CN109775868A discloses a method for the treatment and ecological restoration of river and lake water pollution.

[0007] Its ecological environment has the following problems:

[0008] ① Semi-enclosed lakes have poor water system connectivity and insufficient hydrodynamics, resulting in low self-purification capacity;

[0009] ②The sludge treatment technology is outdated, and the resource utilization rate is less than 30%;

[0010] ③ The shoreline protection and ecological restoration are disconnected, resulting in weak erosion resistance, easy soil erosion, and even local collapse. Summary of the Invention

[0011] In view of the above-mentioned prior art, the technical problems to be solved by the present invention are the poor water system connectivity of semi-enclosed lakes, the backward silt treatment technology, the disconnect between shoreline protection and ecological restoration, and the weak erosion resistance.

[0012] To address the above problems, this invention provides a method for restoring the aquatic ecosystem of a semi-enclosed lake, comprising the following steps:

[0013] S1. Hydrodynamic optimization and primary ecosystem construction: The lake will be transformed through water system connectivity projects to enhance water flow. On this basis, a gradient zone of submerged plants will be set up in the lake area, and aquatic animals will be introduced simultaneously to build a food chain. The submerged plant gradient zone will be planted with a combination of turbidity-tolerant plant species.

[0014] S2. Environmental dredging and silt resource utilization: The lake area is divided into blocks by using a cofferdam for zoned diversion. The silt in the isolated area is dredged by dry excavation and pumping in sequence. The dredged silt is transported to the treatment area for high-pressure filter solidification. The solidified soil is then used for surrounding landscaping or embankment reinforcement.

[0015] S3. Ecological bank protection construction: A composite bank protection structure is constructed along the bank slope. The bank protection structure, from the water body to the bank slope, includes submerged plant strips, soil and water protection blankets, and imitation wood pile bank protection. The imitation wood pile bank protection uses reinforced concrete imitation wood piles driven into the bank slope base to provide mechanical support. The soil and water protection blanket is laid on the bank slope surface and connected and fixed to the imitation wood pile bank protection for seepage prevention and erosion resistance. Submerged plants are planted in the near-shore waters to form a composite bank protection structure of "mechanical support + seepage prevention + ecological buffer", which effectively improves the erosion resistance and thus maintains the soil and water on the bank, making it less prone to soil erosion.

[0016] The imitation wood pile revetment includes two sets of imitation wood piles. The bottom of the imitation wood piles is connected to an expansion unit. The two sets of imitation wood piles are of different heights and are arranged alternately. Multiple imitation wood piles are fixedly connected to the soil and water protection blanket with rope loops. Loosening monitoring units are set on the imitation wood piles. The rope loops include a ring section and a straight section fixedly connected to the outer end of the ring section. The straight section is fixedly connected to the soil and water protection blanket. The ring section is fitted over the imitation wood piles, and the loosening monitoring unit is located inside the ring section.

[0017] In the above-mentioned semi-enclosed lake water ecological restoration methods, the ecological restoration of this type of semi-enclosed lake is achieved by constructing a lake water ecosystem, environmentally friendly dredging and silt treatment, as well as composite ecological revetment and estuary wetland and water system connectivity regulation, thereby improving water transparency and forming a replicable plateau lake ecological restoration technology system.

[0018] As a further improvement to this application, the turbidity-tolerant plant species in the submerged plant gradient zone in step S1 are a combination of Vallisneria natans and Potamogeton malaianus, and the aquatic animals in step S1 include filter-feeding fish, benthic mollusks and zooplankton.

[0019] As a further improvement of this application, the expansion unit includes a rectangular base plate fixedly connected to the lower end of the imitation wood pile, two force-expanding protrusions fixedly connected to the front and rear ends of the rectangular base plate, and two annular steel sleeves respectively fitted outside the two adjacent force-expanding protrusions. The rectangular base plate at the bottom of the tall imitation wood pile is located above the two adjacent rectangular base plates and abuts against them. A tapered anchor rod is also fixedly connected to the lower end of the rectangular base plate at the bottom of the tall imitation wood pile, and the tapered anchor rod penetrates the space between the two adjacent rectangular base plates. The height of the imitation wood pile underground is not less than 1 / 3 of the overall height of the imitation wood pile.

[0020] As a further improvement of this application, the imitation wood pile includes two large-diameter sections, a small-diameter section fixedly connected between the two large-diameter sections, and a fixed arc layer. The loosening monitoring unit includes a moving arc layer wrapped around the small-diameter section, multiple colored rods fixedly connected to the upper end of the moving arc layer, and multiple limiting sleeves respectively sleeved on the colored rods. Multiple longitudinal holes are drilled in the upper large-diameter section, and multiple colored rods move through the longitudinal holes. A radial groove is drilled at the outer end of the moving arc layer, and the annular section matches the radial groove.

[0021] As a further improvement of this application, the fixed arc layer and the moving arc layer form a complete ring, and the inner diameter of the ring is consistent with the diameter of the small diameter segment, and the central angle of the moving arc layer cross section is greater than 90°.

[0022] As a further improvement of this application, the limiting sleeve is made of a high-toughness material, and the upper and lower ends of the limiting sleeve abut against the large-diameter section and the moving arc layer, respectively, and the upper end of the colored rod is flush with the upper surface of the large-diameter section.

[0023] As another improvement of this application, the imitation wood pile is also equipped with a redundant monitoring unit. The redundant monitoring unit includes a self-reset switch installed at the lower end of the upper large-diameter section, a solar panel fixedly installed at the top of the upper large-diameter section, an LED light, and a microcontroller. The LED light is electrically connected to the solar panel and signal-connected to the microcontroller. The self-reset switch is used to control the power on and off of the LED light. A moving contact rod is also fixedly connected to the upper end of the moving arc layer. The moving contact rod is located directly below the self-reset switch.

[0024] As a further improvement to this application, the distance between the moving contact rod and the self-resetting switch is not less than half the distance between the moving arc layer and the upper large-diameter section.

[0025] In summary, by constructing a lake ecosystem, implementing environmentally friendly dredging and silt treatment, and combining composite ecological revetments with estuarine wetland and water system connectivity regulation, ecological restoration of this semi-enclosed lake is achieved, improving water transparency and forming a replicable plateau lake ecological restoration technology system. Furthermore, the composite revetment structure, combining mechanical support, seepage prevention, and ecological buffering, effectively protects the lake shoreline, enhances the erosion resistance of the bank slope, effectively maintains internal soil and water, and prevents soil erosion. Simultaneously, the loosening monitoring unit effectively monitors the stability of this composite revetment structure, allowing for timely detection of soil erosion due to excessive erosion, facilitating timely maintenance by staff, and reducing the continued expansion of abnormal areas along the shoreline. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating the main process of the first embodiment of this application;

[0027] Figure 2 This is a perspective view of the composite revetment structure according to the first embodiment of this application;

[0028] Figure 3 This is a side view of the composite revetment structure according to the first embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the layout of two sets of imitation wood piles according to the first embodiment of this application;

[0030] Figure 5 This is a partial perspective view of the two sets of imitation wooden piles in the first embodiment of this application;

[0031] Figure 6 This is an exploded view of the two sets of imitation wood piles in the first embodiment of this application;

[0032] Figure 7 This is a side view of the composite revetment structure according to the second embodiment of this application;

[0033] Figure 8 This is a partial perspective view of the imitation wooden stake according to the second embodiment of this application;

[0034] Figure 9 This is a schematic diagram of the radial section of the imitation wood pile according to the second embodiment of this application;

[0035] Figure 10 This is an exploded view of the simulated wooden pile according to the second embodiment of this application;

[0036] Figure 11 This is a partial schematic diagram of the simulated wooden stake after an abnormality occurs in the second embodiment of this application;

[0037] Figure 12This is a schematic diagram of the vertical cross-section of the imitation wood pile portion in the third embodiment of this application;

[0038] Figure 13 This is a schematic diagram of the vertical cross-section of the imitation wood pile portion after an abnormality occurs, according to the third embodiment of this application.

[0039] Explanation of the labels in the diagram:

[0040] 1. Imitation wood pile, 11. Small diameter section, 12. Large diameter section, 131. Fixed arc layer, 132. Moving arc layer, 14. Colored rod, 15. Limiting sleeve, 101. Radial groove, 102. Longitudinal hole, 2. Soil and water protection blanket, 3. Rope sleeve, 31. Ring section, 32. Straight section, 4. Outer expansion unit, 41. Rectangular base plate, 42. Force-expanding protruding rod, 43. Ring steel sleeve, 44. Conical anchor rod, 51. Moving contact rod, 52. Self-resetting switch, 61. Solar panel, 62. LED light. Detailed Implementation

[0041] The three embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0042] First implementation method:

[0043] Figure 1 This paper presents a method for restoring the aquatic ecosystem of a semi-enclosed lake, including the following steps:

[0044] S1. Hydrodynamic optimization and primary ecosystem construction: The lake will be transformed through water system connectivity projects to enhance water flow. On this basis, a gradient zone of submerged plants will be set up in the lake area, and aquatic animals will be introduced simultaneously to build a food chain. The submerged plant gradient zone will be planted with a combination of turbidity-tolerant plant species, preferably a combination of Vallisneria natans and Potamogeton malaianus. Aquatic animals include filter-feeding fish, benthic shellfish and zooplankton.

[0045] Among them, Vallisneria natans and Potamogeton malaianus are suitable for subtropical or temperate lakes. In other climate regions, submerged plants adapted to the climate zone can be selected, depending on the specific location of the lake.

[0046] S2. Environmental dredging and silt resource utilization: The lake area is divided into blocks by using a cofferdam for zoned diversion. The silt in the isolated area is dredged by dry excavation and pumping in sequence. The dredged silt is transported to the treatment area for high-pressure filter solidification. The solidified soil is then used for surrounding landscaping or embankment reinforcement.

[0047] S3, such as Figure 2In the diagram, 'a' represents the bank slope. The ecological bank protection structure is constructed by building a composite bank protection structure along the bank slope. From the water body to the bank slope, the bank protection structure includes a submerged plant strip, a soil and water protection blanket 2, and a simulated wood pile bank protection. The simulated wood pile bank protection uses reinforced concrete simulated wood piles driven into the bank slope base to provide mechanical support. The soil and water protection blanket 2 is laid on the bank slope surface and connected and fixed to the simulated wood pile bank protection for seepage prevention and erosion resistance. Submerged plants are planted in the near-shore waters to form a composite bank protection structure of "mechanical support + seepage prevention + ecological buffer", which effectively improves the erosion resistance and thus maintains the soil and water on the bank, making it less prone to soil erosion.

[0048] like Figure 2-3 The imitation wood pile revetment includes two sets of imitation wood piles 1. The bottom of the imitation wood piles 1 is connected to an expansion unit 4. The two sets of imitation wood piles 1 have different heights and are arranged alternately. The height of the imitation wood piles 1 underground is not less than 1 / 3 of the overall height of the imitation wood piles 1, so that the part pre-buried underground is not too small, so that there is a large anchoring force between it and the soil, and so that it can maintain a good mechanical support effect.

[0049] Multiple imitation wood piles 1 are fixedly connected to the soil and water protection blanket 2 by rope loops 3. The imitation wood piles 1 are equipped with loosening monitoring units. The rope loops 3 include a ring section 31 and a straight section 32 fixedly connected to the outer end of the ring section 31. The straight section 32 is fixedly connected to the soil and water protection blanket 2. The ring section 31 is fitted over the imitation wood piles 1, and the loosening monitoring unit is located inside the ring section 31. The rope loops 3 make the soil and water protection blanket 2 and the imitation wood piles 1 stably connected, providing support for them and enabling them to provide stable protection for the bank slope.

[0050] like Figures 4-6The outer expansion unit 4 includes a rectangular base plate 41 fixedly connected to the lower end of the imitation wood pile 1, two force-expanding protrusions 42 fixedly connected to the front and rear ends of the rectangular base plate 41, and two annular steel sleeves 43 respectively fitted around the two adjacent force-expanding protrusions 42. The rectangular base plate 41 at the bottom of the taller imitation wood pile 1 is located above the two adjacent rectangular base plates 41 and abuts against them. The lower end of the rectangular base plate 41 at the bottom of the taller imitation wood pile 1 is also fixedly connected with a conical anchor rod 44, which penetrates the space between the two adjacent rectangular base plates 41. The bottoms of multiple imitation wood piles 1 of different heights are pressed against each other by the rectangular base plates 41. At the same time, under the action of the annular steel sleeves 43, two sets of imitation wood piles 1 of different heights can be connected in series. When the area covered by the soil and water protection blanket 2 is excessively eroded, resulting in the loss of some soil and water, the soil and water protection blanket 2 in that area will sink under the action of gravity, thus tilting the corresponding imitation wood pile 1. The pulling force causes the corresponding imitation wood pile 1 to tilt towards the lake side and tend to separate from the soil. At this time, for the taller imitation wood pile 1, the conical anchor rod 44 at its bottom is located deeper in the soil, and the barbed structure provides greater anchoring force to resist the above-mentioned trend. At the same time, under the action of the annular steel sleeve 43, when under force, it can be distributed to the two adjacent lower force-expanding protrusions 42, thereby increasing the force-bearing range and reducing local force. For the lower imitation wood pile 1, after being pulled by the soil and water protection blanket 2, the pressure of the rectangular base plate 41 at the higher position on the rectangular base plate 41 at the lower position can effectively inhibit its movement, and at the same time expand the force-bearing range to both sides, thereby increasing the force-bearing range and also reducing local force. In summary, under the action of the outer expansion unit 4, the soil and water protection blanket 2 and the imitation wood pile 1 can be kept stable, and it is not easy for the pile to fall off and cause the local bank slope to lose protection, effectively ensuring the stability of the soil and water protection blanket 2.

[0051] In the aforementioned methods for ecological restoration of semi-enclosed lakes, ecological restoration of such semi-enclosed lakes is achieved through the construction of a lake ecosystem, environmentally friendly dredging and silt treatment, composite ecological revetment, and the regulation and control of estuary wetlands and water system connectivity. This results in improved water transparency and the formation of a replicable plateau lake ecological restoration technology system. Under the action of the composite revetment structure of "mechanical support + seepage prevention + ecological buffering", the lake shore is effectively protected, the erosion resistance of the bank slope is improved, the internal soil and water are effectively maintained, the loss of soil and water is less likely, and the occurrence of local collapse is reduced.

[0052] Second implementation method:

[0053] This embodiment adds a loosening monitoring unit and its related structures to the first embodiment, while the rest remains the same as the first embodiment.

[0054] Figures 8-10As shown, the imitation wood pile 1 includes two large-diameter sections 12, a small-diameter section 11 fixedly connected between the two large-diameter sections 12, and a fixed arc layer 131. The loosening monitoring unit includes a moving arc layer 132 wrapped around the small-diameter section 11, multiple colored rods 14 fixedly connected to the upper end of the moving arc layer 132, and multiple limiting sleeves 15 respectively sleeved around the colored rods 14. Multiple longitudinal holes 102 are drilled in the upper large-diameter section 12, and the multiple colored rods 14 move through the longitudinal holes 102. A radial groove 101 is drilled at the outer end of the moving arc layer 132. The annular section 31 matches the radial groove 101. When the area covered by the soil and water protection blanket 2 is excessively eroded, resulting in some soil loss, causing the corresponding imitation wood pile 1 to tilt towards the lake side and tend to separate from the soil, the rope sleeve 3 generates tension on the imitation wood pile 1. Because the overall anchoring force of the imitation wood pile 1 is strong, the tilting amplitude is small and difficult to detect. At this time, if Figure 11 The rope loop 3 acts directly on the dynamic arc layer 132, causing the dynamic arc layer 132 to tend to move upward. When the soil erosion or collapse in the area covered by the soil and water protection blanket 2 is too large, the force on the dynamic arc layer 132 will also increase, causing it to move upward and drive the colored rod 14 to protrude from the surface of the large diameter section 12. For the staff, the condition of the area covered by the soil and water protection blanket 2 can be effectively judged according to the state of the colored rod 14. Compared with the existing technology, it effectively avoids the situation where soil erosion is difficult to detect. When the local collapse is relatively minor, artificial intervention can be carried out, thereby effectively ensuring the restoration effect of the semi-enclosed lake.

[0055] The fixed arc layer 131 and the moving arc layer 132 form a complete ring, and the inner diameter of the ring is consistent with the diameter of the small diameter segment 11. The central angle of the cross-section of the moving arc layer 132 is greater than 90°. On the one hand, this allows the fixed arc layer 131 to be stably fitted over the small diameter segment 11, making it difficult to separate from it. On the other hand, when under stress, the stress point of the annular segment 31 and the imitation wooden pile 1 is mainly located at the fixed arc layer 131, which facilitates its upward movement.

[0056] The limiting sleeve 15 is made of high toughness material, and the upper and lower ends of the limiting sleeve 15 abut against the large diameter section 12 and the moving arc layer 132 respectively. The upper end of the colored rod 14 is flush with the upper surface of the large diameter section 12. The limiting sleeve 15 is mainly used to restrict the moving arc layer 132 so that it will not easily move upward towards the large diameter section 12, thereby reducing the occurrence of false alarms from the loosening monitoring unit.

[0057] It is worth noting that, to ensure the stable functioning of the loosening monitoring unit when localized soil erosion and collapse occur on the bank slope, such as... Figure 7In the figure, b represents a protrusion. In this embodiment, a protrusion is set at the lake where the imitation wood pile 1 is installed. The protrusion can be formed by cement pouring, so that the straight section 32 rests on the protrusion and the end of the straight section 32 near the imitation wood pile 1 is inclined upward. This causes the soil and water protection blanket 2 to deform towards the bank slope collapse. When the imitation wood pile 1 is under force, the force near the imitation wood pile 1 is inclined upward, so that there is always an upward component force. In this way, when the tensile force of the soil and water protection blanket 2 on the imitation wood pile 1 is too large, the fixed arc layer 131 can move upward, thereby triggering the above-mentioned warning phenomenon.

[0058] With the help of the loosening monitoring unit, the stability of this composite revetment structure can be effectively monitored. When the revetment suffers from soil erosion due to excessive scouring, it can be detected in time, making it easier for staff to carry out timely maintenance and reducing the continued expansion of the abnormal area on the bank.

[0059] The third implementation method:

[0060] This embodiment adds a redundant monitoring unit based on the second embodiment, while the rest remains the same as the second embodiment.

[0061] Figure 12 As shown, the imitation wood pile 1 is also equipped with a redundant monitoring unit. The redundant monitoring unit includes a self-reset switch 52 installed at the lower end of the upper large diameter section 12, a solar panel 61 fixedly installed at the top of the upper large diameter section 12, an LED light 62, and a microcontroller. The LED light 62 is electrically connected to the solar panel 61 and is signal-connected to the microcontroller. A moving contact rod 51 is also fixedly connected to the upper end of the moving arc layer 132. The moving contact rod 51 is located directly below the self-reset switch 52.

[0062] The LED light 62 has a dual-control switch. The microcontroller contains a program to control the LED light 62's timed switch, typically turning it on at night and off during the day. The specific time can be set according to actual needs. Simultaneously, the self-reset switch 52 also controls the power supply to the LED light 62. Figure 13When soil erosion or local collapse occurs in the area covered by the soil and water protection blanket 2, causing the moving arc layer 132 to move upward, the moving contact rod 51 moves upward until it contacts the self-reset switch 52. If the LED light 62 was originally on, it will be turned off at this time, and if the LED light 62 was originally off, it will be turned on at this time, so that the LED light 62 at this location is in the opposite state to the LED lights 62 in other non-collapsed areas around it. This can effectively expand the warning range, making it easier for staff to detect abnormalities in time, and assisting the loosening monitoring unit in monitoring the loosening of the imitation wood pile 1. When the staff arrives at the site, they can combine the state of the LED light 62 with the state of the colored rod 14 to judge and analyze the condition of the corresponding bank slope. When the two abnormalities occur simultaneously, it indicates that the bank slope is abnormal, which can effectively avoid misjudgment caused by damage to the LED light 62 itself.

[0063] The distance between the moving contact rod 51 and the self-reset switch 52 is not less than half the distance between the moving arc layer 132 and the upper large diameter section 12, so that the moving contact rod 51 is not easily close to the self-reset switch 52, thereby turning the LED light 62 on or off.

[0064] Compared to the second implementation method, this implementation method provides a wider range of warnings to staff regarding the conditions below the soil and water protection blanket 2, further accelerates artificial intervention in slope anomalies, and effectively ensures the restoration effect of the semi-enclosed lake.

[0065] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A method for ecological restoration of water in a semi-enclosed lake, characterized in that: Comprise the following steps: S1, water power optimization and primary ecosystem construction: the lake is connected to the water system engineering reconstruction, to enhance the flow of water; On this basis, the submerged plant gradient zone is configured in the lake area, and aquatic animals are introduced simultaneously to build food chain; The submerged plant gradient zone is planted with turbidity-tolerant plant varieties; S2, environmental dredging and sludge resource treatment: the lake area is isolated by cofferdam diversion, and the sludge in the isolated area is sequentially dry excavated and pumped dredged; The dredged sludge is transported to the treatment area, and the treated solidified soil is used for surrounding landscaping or bank reinforcement; S3, ecological revetment construction: a composite revetment structure is constructed on the shore slope line, which comprises a submerged plant zone, a water and soil protection blanket and a wood pile revetment from the water body to the shore slope; The wood pile revetment is made of reinforced concrete wood pile, which is driven into the shore slope basement to provide mechanical support; The water and soil protection blanket is laid on the surface of the shore slope and connected and fixed between the wood pile revetment, which is used for seepage prevention and erosion resistance; The submerged plant is planted in the near-shore water; The wood pile revetment comprises two groups of wood piles, the bottom of the wood pile is connected with an expansion unit, the two groups of wood piles are different in height, and the two groups of wood piles are arranged alternately, a plurality of rope sleeves are fixedly connected between the wood pile and the water and soil protection blanket, a loosening monitoring unit is arranged on the wood pile, the rope sleeve comprises an annular segment and a flat segment fixedly connected to the outer end of the annular segment, the flat segment is fixedly connected with the water and soil protection blanket, the annular segment is sleeved outside the wood pile, and the loosening monitoring unit is located on the inner side of the annular segment; A protrusion is arranged at the lake where the wood pile is installed, the protrusion is formed by cement pouring, and the flat segment is arranged on the protrusion; The expansion unit comprises a rectangular bottom plate fixedly connected to the lower end of the wood pile, two expansion rods fixedly connected to the front and rear ends of the rectangular bottom plate, and two annular steel sleeves sleeved outside the adjacent two expansion rods, the rectangular bottom plate at the bottom of the high wood pile is located above and in contact with the two adjacent rectangular bottom plates, and a tapered anchor rod is fixedly connected to the lower end of the rectangular bottom plate at the bottom of the high wood pile, and the tapered anchor rod penetrates the space between the two adjacent rectangular bottom plates, the height of the wood pile in the ground is not less than 1 / 3 of the overall height of the wood pile; The wood pile comprises two large-diameter segments, a small-diameter segment fixedly connected between the two large-diameter segments, and a fixed-arc layer, the loosening monitoring unit comprises a dynamic-arc layer wrapped outside the small-diameter segment, a plurality of color rods fixedly connected to the upper end of the dynamic-arc layer, and a plurality of limiting sleeves sleeved outside the color rods, a plurality of longitudinal holes are opened in the upper large-diameter segment, a plurality of color rods are movably penetrated through the longitudinal holes, a radial slot is opened in the outer end of the dynamic-arc layer, and the annular segment and the radial slot are matched with each other.

2. The method for ecological restoration of water in a semi-enclosed lake according to claim 1, characterized in that: The turbidity-tolerant plant varieties in the submerged plant gradient zone in step S1 are a combination of Vallisneria and Potamogeton malainatus, and the aquatic animals in step S1 include filter-feeding fish, benthic shellfish and plankton.

3. The method for ecological restoration of water in a semi-enclosed lake according to claim 1, characterized in that: The fixed arc layer and the movable arc layer form a complete ring, and the inner diameter of the ring is consistent with the diameter of the small diameter section, and the central angle of the section of the movable arc layer is greater than 90°.

4. The method for ecological restoration of water in a semi-enclosed lake according to claim 3, characterized in that: The limiting sleeve is made of high toughness material, and the upper and lower ends of the limiting sleeve are in contact with the large diameter section and the movable arc layer respectively, and the upper end of the color rod is flush with the upper surface of the large diameter section.

5. The method for ecological restoration of water in a semi-enclosed lake according to claim 4, characterized in that: The wood pile also has a redundant monitoring unit, which includes a self-reset switch installed at the lower end of the upper large diameter section, a solar cell panel fixedly installed on the top of the upper large diameter section, an LED lamp, and a microcontroller, the LED lamp is electrically connected with the solar cell panel, and the LED lamp is signal connected with the microcontroller, the self-reset switch is used to control the on-off of the LED lamp, and the upper end of the movable arc layer is also fixedly connected with a movable contact rod, which is located directly below the self-reset switch.

6. The method for ecological restoration of water in a semi-enclosed lake according to claim 5, characterized in that: The distance between the movable contact rod and the self-reset switch is not less than half of the distance between the movable arc layer and the upper large diameter section.

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