A method for controlling and maintaining artificial directional filling on wind-eroded sand beaches

Abstract

The present invention relates to the field of wind erosion control technology, and specifically to a method for artificial directional filling and maintenance control applicable to wind-eroded sand beaches, comprising: generating a wind erosion risk distribution heat map based on beach elevation point cloud data and historical wind erosion vector maps, marking strong wind erosion areas as targeted maintenance areas; using a particle size layer filling device to sequentially construct a coarse sand layer, a medium sand layer, and a fine sand layer based on the results of in-situ sand particle size analysis; shaping a continuous wavy wind-guiding ridge on the surface of the filling area, controlling its direction with the direction of the main harmful wind and meeting the ridge height-width ratio and slope requirements; evenly distributing diamond-shaped vegetation troughs on the leeward side of the ridge, filling it with a sand-humus-water-retaining agent mixed matrix, planting salt-alkali-tolerant shrubs, and laying a high-density mycorrhizal fiber mat activated by seaweed extract, ultimately constructing a gridded biological sand fixation system. The present invention achieves high-precision identification of wind-eroded sand beaches, coordinated control of structurally stable filling and ecological restoration, and has the advantages of strong stability and wide applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of wind erosion control, and in particular to a method for controlling and regulating artificial directional filling and maintenance of wind-eroded sand beaches. Background Art

[0002] Wind-eroded beaches refer to coastal areas subject to significant wind erosion, severe sand loss, and low ecosystem stability, and are commonly found in arid or semi-arid coastal zones. Affected by strong winds and extreme weather, these beach areas are prone to localized dune migration, sand erosion, and sand leakage, threatening coastal infrastructure, ecological vegetation, and shoreline stability. To curb the degradation of wind-eroded beaches, establishing a synergistic mechanism of "artificial intervention + ecological restoration" has become a hot topic in research and engineering practice. Among these, directional artificial filling, as an active intervention method, has broad application prospects in wind erosion control and vegetation restoration projects due to its flexible operation and strong adaptability.

[0003] However, existing wind filling maintenance methods generally have three technical bottlenecks: first, there is a lack of accurate identification methods for wind erosion intensity based on high-precision spatial data, and the demarcation of maintenance areas relies on empirical judgment, resulting in low intervention efficiency; second, wind filling operations usually do not distinguish between particle size layers, resulting in a loose filling structure, poor wind resistance, and no synergy with the terrain wind-guiding structure; third, biological sand fixation measures such as shrub planting and mycorrhizal laying have point distribution problems and inconsistent construction standards, making it difficult to achieve surface ecological stability and sustainable restoration. Summary of the Invention

[0004] The present invention provides a method for the maintenance and control of artificial directional filling on wind-eroded sand beaches, and proposes a new method for the maintenance and control of wind-eroded sand beaches that integrates high-resolution data support, layered filling structure control, and wind guide-vegetation collaborative design to improve wind erosion resistance and ecological restoration efficiency.

[0005] A method for controlling and maintaining directional filling of wind-eroded sand beaches, comprising the following steps:

[0006] S1: Generate a heat map of wind erosion risk distribution based on beach elevation point cloud data and historical wind erosion vector maps, and mark areas with strong wind erosion as targeted maintenance areas;

[0007] S2: Based on the particle size analysis results of the in-situ sand in the targeted curing area, a particle size layer filling device is used to fill the targeted curing area with a coarse sand layer (0.5-1mm), a medium sand layer (0.25-0.5mm), and a fine sand layer (0.1-0.25mm). The thickness ratio of each layer is 3:5:2.

[0008] S3: Create a continuous wavy wind-guiding ridge on the surface of the fill area. The ridge line should form an angle of 15°±5° with the main harmful wind direction. The ridge line height H and ridge line spacing L should meet the ratio requirements: ;

[0009] S4: Diamond-shaped vegetation troughs are dug on the leeward slope of the wind-guiding ridge, salt- and alkali-tolerant shrub seedlings are planted, and mycorrhizal fiber blankets are laid to form a gridded biological sand fixation system.

[0010] Optionally, the S1 includes:

[0011] S11: UAV LiDAR is used to obtain beach elevation point cloud data with an elevation measurement accuracy of ±2cm;

[0012] S12: overlaying and analyzing the beach elevation point cloud data with the wind erosion depth monitoring values ​​during storm events in the past five years, calculating the wind erosion intensity weight coefficient through GIS spatial interpolation, and generating a historical wind erosion vector map;

[0013] S13: Based on the beach elevation point cloud data and the historical wind erosion vector map, a wind erosion risk distribution heat map is generated using a grid weighted overlay algorithm, wherein the wind erosion risk value R is calculated as:

[0014] , where E is the elevation change rate and K is the wind erosion intensity weight coefficient;

[0015] S14: In the wind erosion risk distribution heat map, mark the area with a risk value R≥0.8 as a strong wind erosion area;

[0016] S15: Delineate a targeted maintenance area based on the spatial boundary of the severe wind erosion area.

[0017] Optionally, the S2 includes:

[0018] S21: collecting in-situ sand samples in the targeted curing area, performing particle size analysis using a laser particle size analyzer, and outputting the particle size analysis results;

[0019] S22: According to the particle size analysis results, the sieve hole combination of the vibrating screening machine of the particle size layer blowing and filling device is adjusted, and the configuration is as follows:

[0020] The diameter of the first-level sieve hole is 0.5mm (to intercept coarse sand);

[0021] Secondary sieve hole diameter 0.25mm (intercepting medium sand);

[0022] The diameter of the third-level sieve hole is 0.1mm (to intercept fine sand);

[0023] S23: Start the particle size layer blowing and filling device to blow a coarse sand layer (0.5-1 mm) into the targeted curing area through the air pressure delivery pipe. The blowing and filling pressure is controlled at 0.3-0.5 MPa. The layer thickness is calculated according to the thickness ratio reference value.

[0024] S24: After the coarse sand layer is filled, switch the vibrating screen to the secondary screen hole and fill the medium sand layer (0.25-0.5mm). The filling pressure is maintained at 0.3-0.5MPa, and the layer thickness is 5 / 3 times that of the coarse sand layer.

[0025] S25: After the medium sand layer is filled, switch the vibrating screening machine to the third-level sieve hole and fill the fine sand layer (0.1-0.25mm). The filling pressure is maintained at 0.3-0.5MPa, and the layer thickness is 2 / 3 times that of the coarse sand layer.

[0026] Optionally, the S3 includes:

[0027] S31: Pre-compact the surface of the targeted curing area after completing the three-layer filling output from S2, using a low-frequency vibration plate (frequency 8-10Hz) to reciprocate along the sand layer until the compaction reaches 85%-90%;

[0028] S32: Calculate the strike angle of the wind-guiding ridgeline based on the main harmful wind direction data provided by the local meteorological department, and set the angle between the ridgeline strike and the main harmful wind direction to 15°±5°;

[0029] S33: Based on the ratio requirement of ridge height H to spacing L (H / L=0.3-0.4), a continuous wavy wind-guiding ridge is mechanically formed on the surface of the compacted targeted curing area. The cross section of the ridge is an asymmetric parabola, where:

[0030] The windward slope is strictly set to 1:3;

[0031] The leeward slope ratio is strictly set to 1:5;

[0032] S34: The surface of the continuous wavy air guide ridge is sprayed with humidifiers to shape it, and the natural sedimentation is maintained stable for 48 hours to form the final air guide structure surface.

[0033] Optionally, the S4 includes:

[0034] S41: on the formed wind guide structure surface, locate the leeward slope of the continuous wavy wind guide ridge line;

[0035] S42: Diamond-shaped planting trenches are dug at equal intervals along the leeward slope. The trench depth is 30-40 cm, and the side length is 40 cm × 40 cm. The spacing between the trenches is the same as the spacing L between the wind-guiding ridges.

[0036] S43: Fill the diamond-shaped planting trough with a mixed matrix, which is evenly prepared in a volume ratio of sand: humus: water-retaining agent = 7:2:1.

[0037] Optionally, the S4 further includes:

[0038] S44: Plant salt-tolerant shrub seedlings in a diamond-shaped planting trough filled with mixed substrate. Choose Tamarix or Hibiscus syriacus, with a planting density of 2-3 plants / m².

[0039] S45: Cut the mycorrhizal fiber blanket into diamond-shaped units (the size of which matches the diamond-shaped planting trough), and lay them on the surface of the planting trough and the surrounding slope. The mycorrhizal fiber blanket is made of a coconut shell fiber substrate inoculated with AM fungi, and the mycelium density is ≥50 hyphae / cm²;

[0040] S46: Spray the area where the mycorrhizal fiber blanket is laid with rooting water (water volume 20-30L / m²) to start the maintenance procedure of the grid-based biological sand fixation system.

[0041] Optionally, the sieve hole configuration of the vibrating screening machine in S22 meets the dynamic verification conditions: when the particle size analysis results of the in-situ sand show that the coarse sand content is less than 40%, the diameter of the first-level sieve hole is reduced to 0.45 mm; when the fine sand content is greater than 30%, the diameter of the third-level sieve hole is expanded to 0.15 mm.

[0042] Optionally, the ridge height H of the continuous wavy wind-guiding ridge formed in S33 is determined by the formula Determined dynamically, L is the ridgeline spacing, and the length of a single ridgeline shall not exceed 50m. A 2m wide buffer zone is set every 50m.

[0043] Optionally, the mycorrhizal fiber blanket laid by S45 is immersed in an activation solution containing seaweed extract (concentration 1.5 g / L) for 30 minutes before cutting, and the re-measured value of the mycelium density after laying shall not be less than 90% of the original density.

[0044] Beneficial effects of the present invention:

[0045] The present invention constructs a historical wind erosion vector map by integrating the beach elevation point cloud data obtained by drone LiDAR with the wind erosion depth monitoring values ​​of the past five years, and calculates the wind erosion risk value through a raster weighted overlay algorithm to form a high-resolution wind erosion risk distribution heat map, thereby achieving accurate identification and targeted delineation of strong wind erosion areas, and effectively avoiding the problems of large-scale blind intervention and waste of resources in traditional governance solutions.

[0046] The present invention dynamically adjusts the sieve hole configuration of the particle size layer filling device based on the results of in-situ sand sample particle size analysis, realizes layered filling of coarse sand, medium sand and fine sand, and constructs a wind-erosion-resistant sand layer structure with a thickness ratio of 3:5:2; combined with the mechanical shaping of the continuous wavy wind-guiding ridge line, an asymmetric parabolic cross-section of 1:3 on the windward slope and 1:5 on the leeward slope is designed, and the ridge line height is controlled to form a stable and efficient wind flow refraction and guidance structure, which greatly improves the sand surface's anti-disturbance ability.

[0047] The present invention establishes a gridded biological sand fixation system by evenly excavating diamond-shaped vegetation troughs on the leeward side slope of the wind-guiding ridge, filling them with a mixed matrix of sand, humus and water-retaining agent, planting salt-alkali-tolerant shrubs such as Tamarix or Hibiscus syriacus, and laying pre-activated high-density mycorrhizal fiber blankets. In combination with the rooting water and mycelium re-testing standards, the system has multiple functions such as water retention, mycorrhizal symbiotic sand fixation, and ecological restoration, ensuring the long-term stable operation of the maintenance area and sustainable ecological restoration capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 Schematic diagram of a method flow in an embodiment of the present invention;

[0050] Figure 2 Schematic diagram of the S4 process of an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative methods for implementing certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0052] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0053] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0054] like Figure 1-Figure 2 As shown, a method for controlling and regulating directional filling maintenance of wind-eroded sand beaches includes the following steps:

[0055] S1: Generate a heat map of wind erosion risk distribution based on beach elevation point cloud data and historical wind erosion vector maps, and mark areas with strong wind erosion as targeted maintenance areas;

[0056] S2: Based on the particle size analysis results of the in-situ sand in the targeted curing area, a particle size layer filling device is used to fill the targeted curing area with a coarse sand layer (0.5-1mm), a medium sand layer (0.25-0.5mm), and a fine sand layer (0.1-0.25mm). The thickness ratio of each layer is 3:5:2.

[0057] S3: Create a continuous wavy wind-guiding ridge on the surface of the fill area. The ridge is oriented at an angle of 15°±5° to the main harmful wind direction. The ridge height H and spacing L satisfy H / L=0.3-0.4.

[0058] S4: Diamond-shaped vegetation troughs are dug on the leeward slope of the wind-guiding ridge, salt- and alkali-tolerant shrub seedlings are planted, and mycorrhizal fiber blankets are laid to form a gridded biological sand fixation system.

[0059] S1 includes:

[0060] S11, Acquisition of Beach Elevation Point Cloud Data: An airborne drone LiDAR system was used to perform high-density scanning of the target beach area, acquiring comprehensive, accurate beach elevation point cloud data. The LiDAR system maintained a vertical ranging error within ±2 cm and a horizontal resolution better than 0.2 m. The point cloud data recorded elevation changes as (x, y, z) triples, providing a spatial reference for subsequent wind erosion intensity calculations.

[0061] S12, Construction of historical wind erosion vector map: Combined with the typhoon and storm event data recorded by the local meteorological station in the past five years, the wind erosion depth monitoring value sequence of the corresponding period is extracted. The wind erosion depth monitoring value (unit: cm) is superimposed on the point cloud elevation change layer to form a time series change model. The wind erosion intensity weight coefficient is calculated for each grid cell through the GIS spatial analysis module. , its expression is:

[0062] ;

[0063] in, is the average wind erosion depth of the grid in the past five years, This is the maximum wind erosion depth in the history of this beach area.

[0064] The obtained wind erosion intensity weight coefficient K layer constitutes the historical wind erosion vector map.

[0065] S13, wind erosion risk value calculation and heat map generation: perform differential processing on the beach elevation point cloud data and calculate the elevation change rate E, which is defined as follows:

[0066] ;

[0067] in, is the elevation value at the initial observation time, is the elevation value at the latest observation time;

[0068] Combined with the K value, the wind erosion risk value R of each grid is calculated: ;

[0069] Here, dividing by 10 is the normalization factor, so .

[0070] The calculation results form a heat map of wind erosion risk distribution, in which the color scale changes continuously from low risk (blue) to high risk (red).

[0071] Example: The initial value of the elevation of a cell in a certain area is 2.00m, and the current value is 1.82m. Then:

[0072] ;

[0073] If the 5-year average wind erosion depth in this area is 18 cm and the maximum wind erosion depth is 30 cm, then:

[0074] ;

[0075] The wind erosion risk value of the area is:

[0076] .

[0077] S14, Marking of strong wind erosion areas: Mark all areas meeting the requirements in the wind erosion risk distribution heat map. The regional raster is extracted, a spatial vector boundary layer is generated, and the areas are uniformly labeled as strong wind erosion areas. This process is completed through spatial query and binarization to ensure the continuity of the marked areas.

[0078] S2 includes:

[0079] S21, Particle Size Analysis: Within the designated targeted conservation area, in-situ sampling points are arranged using an equidistant grid pattern, with sampling depth controlled within the surface layer of 0-20 cm. The collected in-situ sand samples are analyzed using a laser particle size analyzer, which outputs a particle size distribution histogram and the percentage of each particle size. The particle size range is divided into the following:

[0080] Coarse sand particle size range: 0.5-1mm;

[0081] Medium sand particle size range: 0.25-0.5mm;

[0082] Fine sand particle size range: 0.1-0.25mm;

[0083] The output results form the following granularity analysis vector: ,in, is the percentage of coarse sand content, is the percentage of medium sand content, is the percentage of fine sand content, satisfying .

[0084] S22, Vibrating Screen Mesh Configuration: Based on the particle size analysis results, configure the vibrating screen mesh combination in the particle size layer blowing and filling device. The standard mesh configuration is as follows:

[0085] First-level sieve diameter: 0.5mm (retaining particles with a particle size ≥ 0.5mm);

[0086] Secondary sieve diameter: 0.25mm (retains particles with a diameter ≥ 0.25mm and < 0.5mm);

[0087] Diameter of the third-level sieve: 0.1mm (retaining particles with a size ≥ 0.1mm and < 0.25mm).

[0088] In order to ensure the screening accuracy and clear separation of blown filling materials, dynamic verification conditions need to be implemented:

[0089] like , then the first-level sieve hole diameter is adjusted to 0.45mm to increase the screening fineness;

[0090] like , the diameter of the third-level sieve hole is relaxed to 0.15mm to reduce the screening blockage rate.

[0091] Example: If the analysis result of a sample is: , then because , the first-level sieve hole should be adjusted to 0.45mm, and the rest remain the default.

[0092] S23, coarse sand layer blowing and filling: Activate the first-level sieve combination to separate the coarse sand particles with a particle size of 0.5-1mm, and blow them into the targeted curing area through the air pressure conveying pipe. The blowing and filling pressure is controlled at: ;

[0093] Thickness of coarse sand layer As the base thickness benchmark value, users can use the median wind erosion depth of the region Settings, recommended settings are: ;

[0094] in The median wind erosion depth over the past five years (unit: cm). Grid path scanning was used for blown fill to ensure uniform thickness across all units.

[0095] S24, medium sand layer filling: After the coarse sand layer is filled, switch to the secondary sieve (0.25mm) to screen the medium sand particle size group (0.25-0.5mm), and maintain the filling pressure at: ;

[0096] Thickness of medium sand layer Satisfy the following proportional relationship: ;

[0097] S25, fine sand filling: After the medium sand layer is completed, switch to the third-level sieve (default 0.1mm, which can be relaxed to 0.15mm if dynamic adjustment is required) to screen fine sand with a particle size range of 0.1-0.25mm. Filling pressure maintenance:

[0098] ;

[0099] Thickness of fine sand layer Satisfy the following proportional relationship:

[0100] Example calculation of thickness of each layer:

[0101] Assuming the median wind erosion depth in the area ,but:

[0102] Thickness of coarse sand layer: ;

[0103] Thickness of medium sand layer: ;

[0104] Thickness of fine sand layer: ;

[0105] S3 includes:

[0106] S31, Pre-compaction: To ensure the foundation stability of the three-layer, graded sand fill completed in S2 during the subsequent mechanical shaping of the wind guide ridge, pre-compaction is performed on the surface layer of the targeted curing area. This compaction process utilizes low-frequency vibrating plate compaction equipment with a controlled vibration frequency of 8–10 Hz, an effective plate contact area of ​​≥0.5 m², and a working weight of at least 800 kg to provide appropriate sinking force and ensure the sand layer is compacted to the target density.

[0107] Compaction is performed in a grid-like pattern, with a horizontal, reciprocating, staggered approach. The overlap is controlled at 30%–40% to avoid missing any compacted areas. An integrated compaction sensor system provides real-time feedback on construction quality, controlling the compaction target range.

[0108] The built-in compaction sensor monitors the compaction status in real time and controls the target compaction degree at: ,in Represents the relative degree of compaction and is calculated as: , is the on-site dry density, It is the maximum dry density obtained from laboratory compaction test.

[0109] Example: If the dry density measured on site is , the maximum dry density is ,but:

[0110] ;

[0111] Meet compaction requirements.

[0112] S32, calculation of wind guide ridge strike angle: In order for the wind guide ridge to fully play its role in wind direction guidance, wind speed control and turbulence relief, its strike angle and the direction of the main harmful wind must be reasonably set. Introduce the wind direction statistical data of the past 10 years provided by the local meteorological bureau, generate a wind rose diagram, and extract the direction value with the highest frequency in the wind rose diagram. . Set the wind guide ridge line angle Satisfies the following angle relationship: ;

[0113] This angle setting can induce wind flow refraction and enhance diversion stability, and the specific direction is calibrated by the total station instrument.

[0114] For example, if the dominant local wind direction is NNE (wind direction angle 22.5°), the wind deflection ridgeline should be laid out between 7.5° and 37.5°. Construction layout is completed using a total station in conjunction with a laser theodolite, and the direction is calibrated every 20 meters to ensure continuity and deviation control.

[0115] S33, Wind Guide Ridge Structural Parameter Setting and Mechanical Shaping: Parametrically design the spatial geometry of the wind guide ridge and use mechanical shaping equipment to physically construct it. The ridge design must meet the following structural ratios: ;

[0116] At the same time, the dynamic value of the ridge height H is determined by the following formula: , where L is determined by the terrain zoning and the deployment capacity of construction machinery, with a recommended value of 1.5-2.5m. The ridgeline is mechanically shaped by a dedicated slope forming machine, with an asymmetric parabolic cross-section that meets the following slope parameters:

[0117] Windward slope: ;

[0118] Leeward slope slope: ;

[0119] That is, for every 1 unit of elevation upward, the corresponding horizontal distance is 3 or 5 units. Example calculation: If the selected spacing ,but:

[0120] ;

[0121] Mechanical shaping utilizes a crawler-mounted slope shaping machine equipped with a three-axis parabolic shovel, which continuously pushes the shovel to form the slope. The shovel width matches the spacing between ridgelines. To prevent excessive ridgelines from causing wind pressure accumulation and disrupting drainage, a 2-meter-wide buffer zone is installed every 50 meters, with a transition slope of 1:10, providing both structural release and equipment reversal capabilities.

[0122] S34, Surface shaping of the wind guide ridge: After the wind guide ridge is shaped, its surface may be slightly loose and threshed. If not treated in time, it may become unstable due to condensation at night, early wind or disturbance by small animals. This step uses spray humidification shaping technology for reinforcement. The humidification equipment uses an atomizing nozzle array system. The spray equipment controls the spray flow rate to 1.5-2.0L / min / , to maintain the surface moisture content at 10%-12%.

[0123] After spraying, set up a fenced-off curing area and allow the material to settle naturally for at least 48 hours. During this period, no disturbance should be performed. If wind speeds exceed 4 m / s during the settling period, re-humidify the material and spray additional binder (such as a sodium alginate-carboxymethyl cellulose mixture) to enhance early structural stability.

[0124] S4 includes:

[0125] S41, Locating the Leeward Slope of the Wind-Guiding Ridge: After completing the continuous undulating wind-guiding ridgeline in S3, the leeward slope of the ridgeline must be precisely identified as the priority area for ecological vegetation placement. Using an RTK-GPS high-precision positioning system combined with a slope extraction algorithm, parabolic slopes with a slope ratio of 1:5 are automatically identified within the 3D terrain model. To facilitate subsequent mechanized trenching operations, the slope strip 20 to 80 cm below the ridgeline is selected as the construction area. Air vents or high-interference areas are excluded to ensure a closed environment conducive to plant rooting.

[0126] S42, Diamond-Shaped Vegetation Troughs: On the identified leeward slope, troughs are laid out in an equidistant pattern, along the direction of the wind-guiding ridgeline. The troughs are designed in a diamond shape, with each trough 40 cm long and 30–40 cm deep, angled into the slope. Grooving is performed using a slope-guided, fixed-depth troughing machine equipped with automatic angle correction and soil-slicing devices to prevent localized slope disturbance and edge collapse.

[0127] The calculation formula for the area of ​​diamond-shaped planting trough is:

[0128] ;

[0129] During the excavation process, pay attention to controlling the flatness of the trench bottom and maintaining a certain degree of roughness on the trench wall to facilitate the embedding of the matrix and the attachment of the roots.

[0130] S43, Mixed Media Filling: After the trough is constructed, fill each planting trough with a pre-mixed, uniformly prepared media. This media consists of sand, humus, and water-retaining agent in a volume ratio of 7:2:1. A spiral blade agitator is used to continuously mix the media to ensure uniform distribution. The media should be filled to approximately 90% of the trough depth, leaving headroom for planting and water retention.

[0131] Example calculation of single tank fill volume:

[0132] If the tank depth is 35 cm, the tank volume is:

[0133] Single tank volume cm=48.6L, then the proportion is:

[0134] SARS: 33.95L, humus: 9.7L, water retaining agent: 4.85L;

[0135] After filling, compact it manually to avoid seedlings from falling over or water loss due to excessive porosity.

[0136] S44, planting salt-alkali tolerant shrub seedlings: In the filled planting trough, artificially plant salt-alkali tolerant shrub seedlings, preferably Tamarix chinensis or Hibiscus hamabo. According to the regional wind resistance and sand fixation dense planting standards, set the planting density to:

[0137] To improve the survival rate, each seedling needs to be acclimated in advance, including salinity adaptation water bath and root pruning, and local compaction and root water sealing after planting.

[0138] S45, mycorrhizal fiber blanket laying: Cut the mycorrhizal fiber blanket into diamond-shaped units (40 cm side length) that match the size of the diamond-shaped planting trough, and cover the trough surface and the surrounding slope area of ​​30 cm to form a continuous windbreak and sand fixation network. The fiber blanket structure is:

[0139] Base material: coconut shell fiber;

[0140] Species: AM fungi (arbuscular mycorrhiza);

[0141] Mycelium density: ;

[0142] Pretreatment: Before cutting, soak the fiber blanket in a 1.5g / L seaweed extract activation solution for 30 minutes to activate the mycelium. After laying, retest the mycelium density in some areas, which must be no less than 90% of the original density.

[0143] ;

[0144] The outer edge of the fiber blanket should be fixed with pressure strips to prevent it from being lifted by the wind. U-shaped fixing nails should be added for anchoring in areas with slopes exceeding 25°.

[0145] S46, rooting water spraying and biological sand fixation system start: evenly spray rooting water in the paving area, and control the water volume to:

[0146] ;

[0147] Use a multi-hole atomizing nozzle for spraying to ensure that the surface of the fiber blanket is moistened and to activate the symbiotic system of AM fungi hyphae and roots.

[0148] Use salt-free freshwater or low-mineralized well water containing trace elements and growth promoters to activate AM fungi and stimulate root symbiosis. Avoid open water or surface runoff during spraying. Spray in two staggered sprayings, with 10-minute intervals between each application.

[0149] Once spraying is completed, the grid-based biological sand fixation system is officially launched and enters the maintenance and management phase, which includes:

[0150] Weekly monitoring: plant growth status, survival rate (target ≥90%), soil moisture content;

[0151] Monthly supplementation: micronutrient solution (containing P, K and mycorrhizal growth-promoting factors);

[0152] Quarterly testing: mycorrhizal infection rate, fiber blanket integrity, vegetation coverage and sand surface anti-interference coefficient.

[0153] Through the synergistic mechanism of mycorrhizal symbiosis + structural coverage + shrub roots, an integrated sand-fixing structure of "root-net-blanket-sand" is formed to achieve the goals of long-term ecological stability and wind erosion suppression.

[0154] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0155] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for controlling and maintaining directional filling of wind-eroded sand beaches, characterized in that: The following steps are involved: S1: Generate a heat map of wind erosion risk distribution based on beach elevation point cloud data and historical wind erosion vector maps, and mark areas with strong wind erosion as targeted maintenance areas; S2: Based on the particle size analysis results of the in-situ sand in the targeted curing area, a particle size-divided layer filling device is used to sequentially fill the targeted curing area with coarse sand layer, medium sand layer, and fine sand layer, with the thickness ratio of each layer being 3:5:2; S3: Create a continuous wavy wind-guiding ridge on the surface of the fill area. The ridge line should form an angle of 15°±5° with the main harmful wind direction. The ridge line height H and ridge line spacing L should meet the ratio requirements: ,include: S31: Pre-compact the surface of the targeted curing area after completing the three-layer filling output from S2, using a low-frequency vibration plate to reciprocate along the sand layer until the compaction reaches 85%-90%; S32: Calculate the strike angle of the wind-guiding ridgeline based on the main harmful wind direction data provided by the local meteorological department, and set the angle between the ridgeline strike and the main harmful wind direction to 15°±5°; S33: Based on the ratio requirement of ridge height H and ridge spacing L, a continuous wavy wind-guiding ridge is mechanically formed on the surface of the compacted targeted curing area. The cross section of the ridge is an asymmetric parabola, where: The windward slope is strictly set to 1:3; The leeward slope ratio is strictly set to 1:5; S34: The surface of the continuous wavy wind guide ridge line is sprayed with humidifier to shape it, and the natural sedimentation is maintained for 48 hours to form the final wind guide structure surface; S4: Diamond-shaped vegetation troughs are dug on the leeward slope of the wind-guiding ridge, salt- and alkali-tolerant shrub seedlings are planted, and mycorrhizal fiber blankets are laid to form a gridded biological sand fixation system.

2. The method for controlling and maintaining directional filling of wind-eroded sand beaches according to claim 1, characterized in that: Said S1 comprises: S11: UAV LiDAR is used to obtain beach elevation point cloud data with an elevation measurement accuracy of ±2cm; S12: overlaying and analyzing the beach elevation point cloud data with the wind erosion depth monitoring values ​​during storm events in the past five years, calculating the wind erosion intensity weight coefficient through GIS spatial interpolation, and generating a historical wind erosion vector map; S13: Based on the beach elevation point cloud data and the historical wind erosion vector map, a wind erosion risk distribution heat map is generated using a grid weighted overlay algorithm, wherein the wind erosion risk value R is calculated as: , where E is the elevation change rate and K is the wind erosion intensity weight coefficient; S14: In the wind erosion risk distribution heat map, mark the area with a risk value R≥0.8 as a strong wind erosion area; S15: Delineate a targeted maintenance area based on the spatial boundary of the severe wind erosion area.

3. The method for controlling and maintaining directional filling of wind-eroded sand beaches according to claim 2, characterized in that: The S2 includes: S21: collecting in-situ sand samples in the targeted curing area, performing particle size analysis using a laser particle size analyzer, and outputting the particle size analysis results; S22: According to the particle size analysis results, the sieve hole combination of the vibrating screening machine of the particle size layer blowing and filling device is adjusted, and the configuration is as follows: The diameter of the first-level sieve hole is 0.5mm; The diameter of the secondary sieve is 0.25mm; The diameter of the third-level sieve hole is 0.1mm; S23: Start the particle size layer blowing and filling device to blow the coarse sand layer into the targeted curing area through the air pressure conveying pipe. The blowing and filling pressure is controlled at 0.3-0.5 MPa, and the layer thickness is calculated according to the thickness ratio reference value; S24: After the coarse sand layer is filled, switch the vibrating screen to the secondary screen hole and fill the medium sand layer with the filling pressure maintained at 0.3-0.5 MPa. The layer thickness is 5 / 3 times that of the coarse sand layer. S25: After the medium sand layer is filled, switch the vibrating screening machine to the third-level sieve hole and fill the fine sand layer. The filling pressure is maintained at 0.3-0.5MPa, and the layer thickness is 2 / 3 times that of the coarse sand layer.

4. The method for controlling and maintaining directional filling of wind-eroded sand beaches according to claim 1, characterized in that: The S4 includes: S41: on the formed wind guide structure surface, locate the leeward slope of the continuous wavy wind guide ridge line; S42: Diamond-shaped planting trenches are dug at equal intervals along the leeward slope. The trenches are 30-40 cm deep and 40 cm x 40 cm long. The spacing between the trenches is the same as that between the wind-guiding ridges. S43: Fill the diamond-shaped planting trough with a mixed matrix, which is evenly prepared in a volume ratio of sand: humus: water-retaining agent = 7:2:

1.

5. The method for controlling and maintaining directional filling of wind-eroded sand beaches according to claim 4, characterized in that: Said S4 further comprises: S44: Plant salt-tolerant shrub seedlings in a diamond-shaped planting trough filled with mixed substrate. Choose Tamarix or Hibiscus syriacus, with a planting density of 2-3 plants / m². S45: Cut the mycorrhizal fiber blanket into diamond-shaped units and lay them on the surface of the planting trough and the surrounding slope. The mycorrhizal fiber blanket is made of a coconut shell fiber substrate inoculated with AM fungi, and the mycelium density is ≥50 hyphae / cm²; S46: Spray rooting water on the area where the mycorrhizal fiber blanket is laid to start the maintenance procedure of the grid-based biological sand fixation system.

6. The method for controlling and maintaining directional filling of wind-eroded sand beaches according to claim 3, characterized in that: The sieve hole configuration of the vibrating screening machine in S22 meets the dynamic verification conditions: when the particle size analysis results of the in-situ sand show that the coarse sand content is less than 40%, the diameter of the first-level sieve hole is reduced to 0.45 mm; when the fine sand content is greater than 30%, the diameter of the third-level sieve hole is expanded to 0.15 mm.

7. The method for controlling and maintaining directional filling of wind-eroded sand beaches according to claim 1, characterized in that: The continuous wavy wind-guiding ridge formed in S33 has a ridge height H determined by the formula Determined dynamically, L is the ridgeline spacing, and the length of a single ridgeline shall not exceed 50m. A 2m wide buffer zone is set every 50m.

8. The method for controlling and maintaining directional filling of wind-eroded sand beaches according to claim 5, characterized in that: The mycorrhizal fiber blanket laid by S45 is immersed in an activation solution containing seaweed extract for 30 minutes before cutting, and the re-measured value of the mycelium density after laying shall not be less than 90% of the original density.

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