Method for treating erosion gully

Abstract

The invention discloses a method for treating an erosion gully, relates to the technical field of environmental governance, and aims at solving the problems that a traditional method is poor in ecological property, insufficient in impact resistance and weak in long-term effect. The method comprises the steps that a corrosion-resistant enhanced straw-based composite coiled material is prepared; preparing a gradient functional ecological planting module containing a fermentation inner core and a porous outer coating layer; the erosion gully area is pretreated with a biochemical soil stabilizer; a multi-dimensional anti-impact structural body of gabions and composite coiled material cells is constructed at the ditch head, a root-system-imitating anchoring type sediment storage dam is constructed at the ditch bottom, and a three-dimensional net weaving and spraying planting technology is adopted for the ditch slope; a drip irrigation system is arranged for targeted water and fertilizer maintenance; after the wet season, settlement is monitored, reinforcement operation is executed, the used main materials can be completely biodegraded, engineering ditch fixing and bioremediation synergy is achieved, the method is suitable for treatment of different types of erosion ditches, and the treatment effect is stable and long-acting.

Description

Technical Field

[0001] This invention relates to the field of environmental remediation technology, and more specifically, to a method for treating erosion gullies. Background Technology

[0002] Gullies are an extreme form of soil erosion, primarily driven by water erosion and accompanied by gravitational collapse, and are widely developed in hilly, mountainous, and sloping areas. They not only carve away at the land to create fragmented landscapes, leading to a sharp reduction in arable land and loss of soil fertility, but also disrupt surface runoff balance, exacerbating the risk of flooding. Furthermore, gully expansion damages infrastructure such as roads and villages, severs ecological corridors, and causes a decline in biodiversity. Current gully management methods have significant limitations: traditional engineering measures such as stone embankments and concrete retaining walls, while providing short-term gully stabilization, consume large amounts of non-ecological materials such as stone and cement, damaging the original environment and exhibiting poor integration with surrounding vegetation, easily triggering secondary erosion; purely biological measures such as artificial grass planting and shrub planting have extremely weak erosion resistance when the initial root systems are not fully developed, making them unable to withstand concentrated runoff during heavy rainfall, resulting in long treatment cycles and a high risk of recurrence; existing composite measures mostly use non-degradable geomembranes and plastic netting, which remain in the soil for long periods, causing pollution and contradicting the principles of ecological governance.

[0003] Furthermore, traditional methods lack targeted design for the different erosion dynamics of different areas of the gully (gully head, gully bottom, and gully slope). The treatment measures for headwater erosion, bottom incision erosion, and lateral erosion on the gully slope are homogenized, leading to unbalanced treatment effects. Simultaneously, the lack of a systematic maintenance and monitoring mechanism after treatment results in low plant survival rates and structural failure due to settlement and erosion. With the deepening of ecological protection concepts, there is an urgent need for a treatment method that integrates "engineering gully stabilization - bioremediation - ecological recycling." This method utilizes biodegradable materials to construct erosion-resistant structures and combines targeted vegetation cultivation to achieve a balance between short-term stability and long-term ecological restoration, addressing the shortcomings of traditional methods such as poor ecological performance, insufficient erosion resistance, and weak long-term effectiveness. Summary of the Invention

[0004] This application provides a method for treating erosion gullies, which has the advantages of being applicable to the treatment of different types of erosion gullies and having a stable and long-lasting treatment effect.

[0005] This application provides a method for treating erosion gullies, which employs the following technical solution: A method for controlling gully erosion includes the following steps: S1. Preparation of corrosion-resistant and reinforced straw-based composite roll material, the preparation process includes mixing crushed straw, coconut shell fiber, bentonite and pine resin powder in a predetermined ratio, and hot pressing at 120-150°C and 5-10MPa pressure. S2. Prepare a gradient functional ecological planting module, which has a nutrient-rich fermentation inner core layer and a porous outer covering layer made of the corrosion-resistant and reinforced straw-based composite roll material, and shrub seeds and herb seeds are oriented and positioned at different locations in the module. S3. Use biochemical soil stabilizers to spray the areas to be treated at the head, bottom and slope of the erosion gully for pretreatment. S4. In the pre-treated ditch head area, a multi-dimensional impact-resistant structure is constructed by combining gabion base and composite roll cell filling. S5. In the pre-treated ditch bottom area, a root-like anchoring process is adopted, that is, first drive in inclined prefabricated bamboo reinforcement micropiles, then wrap composite rolls and fill them with ecological planting modules to construct a sand-blocking dam. S6. In the pre-treated ditch slope area, a three-dimensional mesh spraying process is adopted, that is, first fix the three-dimensional mesh, and then spray a thickened vegetation substrate layer containing broken ecological planting module material. S7. Install drip irrigation systems in all treated areas and carry out targeted drip irrigation maintenance based on plant phenology. S8. After the project experiences its first high-water season, monitor structural settlement. When the settlement exceeds the threshold, perform structural reinforcement operations.

[0006] Preferably, the components of the corrosion-resistant reinforced straw-based composite roll material include, by weight: 60-70% crushed straw, 20-30% coconut shell fiber, 5-10% bentonite and 3-5% pine resin powder.

[0007] Preferably, in the gradient functional ecological planting module, the shrub seeds are pre-embedded in the fermentation inner core layer, while the herb seeds are dotted on the inner surface of the outer covering layer using a biodegradable adhesive.

[0008] Preferably, the biochemical soil stabilizer is a stabilizer based on microbial-induced calcium carbonate precipitation or a plant-derived tannin-protein composite stabilizer, and its spraying adopts a low-pressure rotary spraying process with a penetration depth controlled at 10-15cm.

[0009] Preferably, the process of constructing the multidimensional impact-resistant structure specifically includes: first, fixing the corrosion-resistant and reinforced straw-based composite roll into a honeycomb-shaped cell using U-shaped metal anchors, and then filling the cell with the gradient functional ecological planting module and local boulders in layers.

[0010] Preferably, in the root-like anchoring process, the precast bamboo-reinforced micropiles are driven into the ground at a 15-20° angle to the vertical plane in a downstream direction, and the surface of the pile is marked.

[0011] Preferably, in the three-dimensional mesh spraying process, the spraying thickness of the thickened vegetation substrate layer is not less than 5 cm, and its components include biochemical soil stabilizer, local soil, adhesive, wood fiber, and crushed material of the gradient functional ecological planting module.

[0012] Preferably, the targeted drip irrigation maintenance specifically involves applying high-phosphorus liquid organic fertilizer, primarily to promote root development, through the drip irrigation system during the plant germination period; and switching to high-nitrogen liquid organic fertilizer, primarily to promote stem and leaf growth, during the rapid growth period of the plant.

[0013] Preferably, the triggering condition for the structural reinforcement operation is: the settlement of the top of the composite grain mill exceeds 10% of its initial height; the reinforcement method is to lay a new corrosion-resistant and reinforced straw-based composite roll on the top of the structure and re-tension and fix it.

[0014] Preferably, all the main materials used in the method, including the corrosion-resistant reinforced straw-based composite roll, the outer covering layer of the gradient functional ecological planting module, and the three-dimensional net, are materials that can be completely biodegraded in the natural environment.

[0015] In summary, this application has the following beneficial effects: 1. The main materials used in this solution, such as composite rolls, planting module outer coverings, and three-dimensional nets, are all biodegradable. Agricultural waste straw is used as the core substrate, which not only solves the problem of straw resource utilization but also avoids environmental pollution caused by the residue of traditional geotextile materials. After the materials degrade, they are transformed into soil organic matter. The fermentation of the inner core layer and the targeted maintenance of organic fertilizer improve soil fertility, achieving a virtuous cycle of "governance-resource-ecology", which is in line with the concept of ecological protection. 2. This scheme adopts a synergistic design of "engineering structure + biological measures". In the initial stage, it relies on engineering structures such as gabions, grid cells, and bamboo piles to resist strong erosion and buy time for vegetation growth. In the later stage, it relies on the targeted cultivation of shrubs and grasses to form a stable ecosystem, achieving the unity of "short-term erosion resistance and long-term gully stabilization". According to the characteristics of different erosion gullies (loess areas, red soil areas, and aeolian sand areas), the material ratio and construction technology can be adjusted to adapt to diverse terrain and soil conditions, and the scope of application is wide. 3. The core materials of this solution use low-cost resources such as straw and local boulders to reduce treatment costs; gradient planting modules and targeted drip irrigation maintenance improve plant survival rates and reduce replanting; settlement monitoring and reinforcement mechanisms promptly repair structural deformation and avoid repeated construction due to treatment failure; after the materials degrade, there is no need for cleaning, and the treatment effect is maintained by natural vegetation succession in the later stage, which greatly reduces operation and maintenance costs and achieves the goal of "one-time treatment - long-term benefit". Attached Figure Description

[0016] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a schematic diagram of the structure of the gradient functional ecological planting module of the present invention; Figure 3 This is a schematic diagram of the multidimensional impact-resistant structure of the present invention; Figure 4 This is a schematic diagram of the sand-trapping dam structure of the present invention. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content. Example

[0018] This embodiment targets typical deep erosion gullies in the Loess hilly area (gully depth 8-12m, gully slope 35-45°, gully bottom width 2-3m, with strong headward and downcutting erosion during rainstorms). It is based on the treatment method and is implemented in a specific way. The materials and processes are adapted to the characteristics of the loess, which are loose, have poor water retention and weak erosion resistance.

[0019] Preparation of Corrosion-Resistant and Reinforced Straw-Based Composite Roll Material: Locally abundant corn stalks are selected and crushed to a particle size of 2-5 mm (to increase specific surface area and enhance bonding strength with the binder). By weight, 65% crushed corn stalks, 25% coconut shell fiber (5-8 mm long, enhancing the tensile strength of the roll material), 7% bentonite (local calcium-based bentonite, improving loess cohesion), and 3% pine resin powder (100 mesh particle size, enhancing corrosion resistance) are mixed and stirred in a twin-screw mixer for 15 minutes until homogeneous. The mixture is then laid into a mold and hot-pressed at 135°C and 8 MPa for 20 minutes. After cooling, a roll material with a thickness of 5 mm and a width of 1 m is formed. The surface of the roll material has pre-set permeable holes with a diameter of 2 mm (facilitating rainwater infiltration and preventing surface water accumulation). This material combines adaptability to loess regions with impact resistance, and its degradation cycle is approximately 2-3 years, matching the vegetation growth period.

[0020] Preparation of gradient functional ecological planting modules: The fermentation inner core layer is made of well-rotted sheep manure (40%), humus (30%), potassium dihydrogen phosphate (5%), and water-retaining agent (2%), fermented for 7 days, rich in nitrogen, phosphorus, and potassium nutrients, suitable for the poor characteristics of loess soil; the outer covering layer is a composite roll material prepared by S1, cut into a cylindrical shell with a diameter of 15cm, and 5mm ventilation holes on the side wall. Shrub seeds are selected from drought-resistant and barren-tolerant sea buckthorn (high germination rate, strong root system for soil fixation), and are pre-buried in the middle of the fermentation inner core layer (5cm deep, to ensure deep root development after germination); herb seeds are selected from alfalfa (nitrogen fixation and soil improvement), and are dotted on the inner surface of the outer covering layer with biodegradable starch adhesive (3cm from the top, germinating before the shrubs, quickly covering the ground surface), to make a cylindrical module with a height of 20cm, and drainage holes at the bottom of the module to prevent waterlogging.

[0021] Soil solidification pretreatment: Microbial-induced calcium carbonate precipitation solidifier (suitable for the alkaline environment of loess, forming a calcium carbonate cement layer after solidification) is selected and sprayed along the head, bottom, and slope of the ditch to be treated using a low-pressure rotary jet sprayer. The nozzle pressure is 0.3 MPa, the moving speed is 0.5 m / s, and the penetration depth is controlled at 12 cm. After spraying, the soil is left to stand for 24 hours to allow the solidifier to fully react with the loess, thereby improving the compressive strength of the surface soil and reducing initial erosion.

[0022] Construction of a multi-dimensional erosion-resistant structure at the gully head: The gully head is where erosion is most severe. First, the surface soil is cleared, and a 30cm high gabion is built as a base using local boulders with a particle size of 20-30cm (to enhance foundation stability). Composite rolls are cut into 1m×1m sizes and fixed to the gully head slope with U-shaped metal anchors (50cm long, 80cm spacing) to form honeycomb-shaped cells (50cm side length of each cell). The cells are then filled in layers: a 10cm thick planting module is laid at the bottom, a 15cm thick local boulders are laid in the middle, and a 5cm thick planting module is laid at the top. The boulders and modules are arranged alternately to enhance erosion resistance. The edges of the cells are tightly fitted to the solidified gully slope to prevent rainwater from seeping into the gaps.

[0023] Construction of a root-like anchored sand-trapping dam at the bottom of the ditch: Due to prominent downcutting erosion at the bottom of the ditch, stakes are first positioned every 1.5m along the axis of the ditch bottom. Precast bamboo-reinforced micropiles (using three-year-old moso bamboo with a diameter of 5cm and a surface groove depth of 2mm to increase friction with the soil) are driven into the ground 80cm deep (deep into the stable soil layer) at an 18° angle to the vertical plane. Composite rolls are wrapped around the outside of the bamboo-reinforced piles, and the overlaps of the rolls are tied with hemp rope (the hemp rope is biodegradable), forming a dam frame with a width of 2.5m. The frame is filled with a mixture of planting modules and loess (volume ratio 1:1). A 5% slope is set at the top of the dam to prevent rainwater retention. A 5cm thick layer of gravel is laid on the upstream and downstream sides of the dam to enhance drainage and prevent erosion.

[0024] Three-dimensional woven netting and spraying on gully slopes: Lateral erosion of gully slopes can easily lead to collapse. First, clear the loose soil from the slope and fix the three-dimensional netting (hemp fiber woven netting, 5cm×5cm aperture, biodegradable). The netting is fixed with 40cm long bamboo anchors at 60cm intervals. Prepare a thickened planting substrate layer, the components of which include plant-derived tannin-protein composite solidifying agent (to help stabilize red soil), local loess (60%), starch binder (3%), wood fiber (5%), and crushed planting module material (32%). Add water and stir until the consistency is appropriate (it can be formed into a ball by hand without dripping). Spray from the bottom of the slope upwards with a hydroseeder, with the thickness controlled at 6cm. After spraying, cover with non-woven fabric to retain moisture. Fix the edges of the non-woven fabric with bamboo nails to prevent it from being blown off by the wind.

[0025] Targeted drip irrigation maintenance: Drip irrigation tapes (50cm spacing) are laid along the ditch head, bottom, and slope, connected to the water storage tank at the ditch mouth (to collect rainwater, adapted to the arid characteristics of the Loess Plateau). During the plant germination period (March-April), the drip irrigation system supplies water once a week for 2 hours each time, and applies a high-phosphorus liquid organic fertilizer (0.5% concentration) mainly composed of potassium dihydrogen phosphate to promote the root development of sea buckthorn and alfalfa; during the rapid growth period (June-August), water is supplied twice a week for 1.5 hours each time, and the fertilizer is switched to a high-nitrogen liquid organic fertilizer (0.3% concentration) mainly composed of urea to promote stem and leaf growth and quickly cover the ground surface.

[0026] Monitoring and Reinforcement: Settlement observation points were set up at the top of the silt-trapping dam and the center of the gully head cells, and monitoring was conducted monthly using a level instrument. During the first high-water season (after the heavy rains in July and August), monitoring revealed that the settlement at the top of the silt-trapping dam reached 8% of its initial height (not exceeding the threshold), and no reinforcement was required. After the following high-water season, the settlement of some gully head cells reached 12%, and reinforcement operations were carried out: the surface boulders were removed, a new layer of composite roofing membrane was laid, anchor bolts were used to re-tension and fix the membrane, and then boulders and planting modules were backfilled to restore erosion resistance. Example

[0027] This embodiment targets shallow gully erosion in the red soil region of southern China (gully depth 1-3m, gully slope 25-30°, concentrated and intense rainfall, strong soil acidity, high clay content, prone to surface erosion and gully erosion). The treatment focuses on adapting to the characteristics of red soil and strengthening the acidity compatibility of drainage and vegetation substrate.

[0028] Composite roll material preparation: Rice straw (local agricultural waste) is selected, crushed to 1-3mm, and mixed with 60% crushed rice straw, 28% coconut shell fiber, 7% sodium bentonite (to improve red soil compaction) and 5% pine resin powder by weight. The mixture is hot-pressed at 120°C and 10MPa for 15 minutes to make a 4mm thick roll material. The diameter of the water permeable holes in the roll material is 3mm (to enhance drainage and cope with concentrated rainfall).

[0029] Ecological planting module: The fermented inner core layer is made of well-rotted pig manure (35%), red soil humus (35%), ferrous sulfate (3%, pH adjusted to suit the acidity of red soil), and water-retaining agent (3%), fermented for 10 days; the outer covering layer is a composite roll material, made into a module with a diameter of 12cm and a height of 18cm. Shrubs selected are Lespedeza bicolor (acid-resistant, nitrogen-fixing), pre-buried in the inner core layer; herbs selected are Bermuda grass (prostrate growth, rapid coverage), distributed on the inner surface of the outer covering layer, and the module side walls are equipped with more drainage holes to prevent rainwater soaking.

[0030] Pretreatment: Use plant-derived tannin-protein composite curing agent (suitable for acidic red soil, avoiding the failure of microbial curing agents in acidic environments), low-pressure rotary spraying with a penetration depth of 10cm, and let stand for 48h after spraying to stabilize the surface of the red soil by utilizing the cementing effect of tannin.

[0031] Ditch head structure: Since the erosion at the head of shallow ditches is relatively weak, the gabion is simplified to a crushed stone bedding layer (20cm thick), and the composite roll cell has a side length of 60cm. Planting modules and red soil blocks are filled in layers to enhance drainage.

[0032] Sand-blocking dam at the bottom of the ditch: bamboo-reinforced micropiles are inclined at an angle of 15° and driven to a depth of 60cm. The dam frame is filled with a mixture of planting modules and gravel (to facilitate drainage). The dam body is equipped with a U-shaped drainage channel to quickly drain rainwater.

[0033] Spraying on slopes: Use coconut fiber netting (acid resistant) for the three-dimensional netting, add sulfur powder to the planting substrate layer (to adjust pH), spray to a thickness of 5cm, and cover with a moisturizing film after spraying to cope with the high temperature evaporation in the south.

[0034] Drip irrigation: Reduce water supply during the rainy season and increase water supply frequency during the dry season (October-November). Use acidic liquid organic fertilizer to avoid altering the pH of the red soil.

[0035] Monitoring: Settlement was monitored after the high water season. Due to the low load on the shallow ditch structure, the settlement was generally less than 5%, and only the locally damaged roll material was replaced and reinforced. Example

[0036] This embodiment targets the gentle slope erosion gullies in the northern wind-blown sand areas (gully depth 0.5-2m, gully slope 15-20°, arid with little rain, strong winds and sand, loose sandy soil, extremely poor erosion resistance, mainly by a combination of wind and water erosion), and focuses on strengthening water retention, corrosion resistance and sand fixation capabilities.

[0037] Composite roll material: Wheat straw (local resource) is selected, crushed to 3-6mm, and mixed with 70% crushed wheat straw, 20% coconut shell fiber, 8% bentonite (strong water retention) and 2% pine resin powder by weight. It is hot-pressed at 150°C and 5MPa pressure for 25 minutes to make a 6mm thick roll material (enhancing wind erosion resistance) with 1mm diameter permeable holes (reducing moisture evaporation).

[0038] Planting Module: The fermented inner core layer consists of 50% well-rotted cow and sheep manure (high nutrient retention), 30% sandy humus soil, and 5% water-retaining agent (strong water absorption), fermented for 15 days; the outer covering layer is a thick roll material, forming a large module with a diameter of 18cm and a height of 25cm. Shrubs are selected from Artemisia argyi (drought-resistant and wind-blown), and herbs from Vitex negundo (drought-resistant and sand-fixing). The seed pre-burying depth is increased to 8cm to ensure the roots penetrate deep into the moist soil layer.

[0039] Pretreatment: Select a microbial solidifying agent (suitable for alkaline sandy soil), spray it to a depth of 15cm (deep into the sandy stabilization layer), and cover it with plastic film to retain moisture for 2 days after spraying.

[0040] The gabion structure is constructed with Gobi gravel (40cm thick, resistant to wind erosion), and the composite roll cell has a side length of 40cm, which is tightly arranged to enhance the sand fixation effect.

[0041] Sand-blocking dam at the bottom of the ditch: bamboo piles are driven to a depth of 100cm (near the groundwater level) with an inclination angle of 20°. The dam body is filled with planting modules and gravel, and the top is designed with an arc-shaped slope (to reduce wind and sand accumulation).

[0042] Spraying on slopes: The three-dimensional netting uses flax fiber netting, and the planting substrate layer is enriched with a large amount of wood fiber (water retention) and sheep manure (long-lasting fertilizer effect). The spraying thickness is 7cm. After spraying, cover with straw mats to reduce wind and sand erosion and water evaporation.

[0043] Drip irrigation: A storage-type drip irrigation system is used (to collect small amounts of summer rainfall), which extends the irrigation interval but increases the amount of water supplied per irrigation. High-concentration slow-release liquid organic fertilizer is selected to suit arid environments.

[0044] Monitoring: Focus on monitoring structural uplift caused by wind and sand accumulation and settlement caused by rainwater erosion. If settlement exceeds the threshold, add more roofing membrane and compact it to prevent wind and sand from entering through gaps.

[0045] Working principle: The core working principle of this method for controlling gully erosion is to construct a collaborative governance system of "engineering gully stabilization - bioremediation - ecological cycle". Through material innovation, regional targeted design, and full-cycle maintenance, it achieves short-term stability and long-term ecological restoration of gullies, as detailed below: Synergistic Functions of Ecological Materials: S1's corrosion-resistant and reinforced straw-based composite roll material uses agricultural waste straw as the base material, combined with coconut shell fiber to enhance tensile strength, bentonite to optimize bonding, and pine resin powder to improve corrosion resistance, forming a "low-cost, high-impact, and biodegradable" characteristic. It not only solves the ecological problems of traditional engineering materials, but also makes up for the insufficient impact resistance of purely biological materials. S2's gradient functional ecological planting module provides long-lasting nutrients through a fermented inner core layer and protects seeds and soil through an outer covering layer. Shrub and herb seeds are oriented and positioned to achieve a temporal synergy of "rapid herb coverage - deep root stabilization of shrubs". In the early stage, it relies on herbs to resist surface erosion, and in the later stage, it relies on shrubs to build a stable root network.

[0046] Regionally Targeted Erosion Control Mechanisms: Differentiated management strategies are adopted to address the varying erosion dynamics in different areas of the gully. The gully head is the starting point of headwater erosion. In S4, a multi-dimensional erosion-resistant structure is constructed using a combination of gabion base and honeycomb cells. This utilizes the rigidity of the gabions combined with the flexibility of the planting modules to disperse runoff impact and prevent gully head expansion. The gully bottom is the core area of ​​downcutting erosion. In S5, a root-like anchored sand-trapping dam uses inclined bamboo micropiles to simulate the anchoring effect of plant roots, penetrating deep into the stable soil layer to transfer stress. Composite rolls and module filling form a permeable dam that both traps sand and drains water, preventing dam collapse. The gully slope is prone to lateral erosion and collapse. In S6, a three-dimensional mesh spraying system combines the mechanical stabilization of the three-dimensional mesh with the biological stabilization of the vegetation substrate layer to quickly form a vegetation cover, reducing rainwater erosion and wind erosion.

[0047] Stability and Cycle Throughout the Entire Cycle: S3's biochemical soil stabilizer pretreatment induces calcium carbonate precipitation or plant-derived tannin cementation through microorganisms, forming a stable cemented layer on the soil surface, providing a foundation for subsequent structural construction and vegetation growth; S7's targeted drip irrigation maintenance precisely supplies water and fertilizer based on plant phenological stages, promoting root development (enhancing soil stabilization) during germination and stem and leaf growth (enhancing cover) during rapid growth, thus improving plant survival rates; S8's monitoring and reinforcement mechanism captures structural deformation through settlement monitoring and promptly reinforces when thresholds are exceeded, forming a closed loop of "construction-monitoring-repair" to ensure long-term and stable treatment effects; all main materials are biodegradable, ultimately transforming into soil organic matter, achieving an ecological cycle of "treatment-degradation-fertilization" with no environmental residue.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for controlling gully erosion, characterized in that: Includes the following steps: S1. Preparation of corrosion-resistant and reinforced straw-based composite roll material, the preparation process includes mixing crushed straw, coconut shell fiber, bentonite and pine resin powder in a predetermined ratio, and hot pressing at 120-150°C and 5-10MPa pressure. S2. Prepare a gradient functional ecological planting module, which has a nutrient-rich fermentation inner core layer and a porous outer covering layer made of the corrosion-resistant and reinforced straw-based composite roll material, and shrub seeds and herb seeds are oriented and positioned at different locations in the module. S3. Use biochemical soil stabilizers to spray the areas to be treated at the head, bottom and slope of the erosion gully for pretreatment. S4. In the pre-treated ditch head area, a multi-dimensional impact-resistant structure is constructed by combining gabion base and composite roll cell filling. S5. In the pre-treated ditch bottom area, a root-like anchoring process is adopted, that is, first drive in inclined prefabricated bamboo reinforcement micropiles, then wrap composite rolls and fill them with ecological planting modules to construct a sand-blocking dam. S6. In the pre-treated ditch slope area, a three-dimensional mesh spraying process is adopted, that is, first fix the three-dimensional mesh, and then spray a thickened vegetation substrate layer containing broken ecological planting module material. S7. Install drip irrigation systems in all treated areas and carry out targeted drip irrigation maintenance based on plant phenology. S8. After the project experiences its first high-water season, monitor structural settlement. When the settlement exceeds the threshold, perform structural reinforcement operations.

2. The method for treating erosion gullies according to claim 1, characterized in that: The components of the corrosion-resistant and reinforced straw-based composite roll material, by weight, include: 60-70% crushed straw, 20-30% coconut shell fiber, 5-10% bentonite, and 3-5% pine resin powder.

3. The method for treating erosion gullies according to claim 1, characterized in that: In the gradient functional ecological planting module, the shrub seeds are pre-embedded in the fermentation core layer, while the herb seeds are dotted on the inner surface of the outer covering layer using a biodegradable adhesive.

4. The method for treating erosion gullies according to claim 1, characterized in that: The biochemical soil stabilizer is a stabilizer based on microbial-induced calcium carbonate precipitation or a plant-derived tannin-protein composite stabilizer. It is sprayed using a low-pressure rotary spraying process, with the penetration depth controlled at 10-15cm.

5. The method for treating erosion gullies according to claim 1, characterized in that: The process of constructing the multidimensional impact-resistant structure specifically includes: first, using U-shaped metal anchors to fix the corrosion-resistant and reinforced straw-based composite roll into a honeycomb-shaped cell, and then filling the cell with the gradient functional ecological planting module and local boulders in layers.

6. The method for treating erosion gullies according to claim 1, characterized in that: In the aforementioned root-like anchoring process, the precast bamboo-reinforced micropiles are driven into the ground at a 15-20° angle to the vertical plane in a downstream direction, and the surface of the pile is marked.

7. The method for treating erosion gullies according to claim 1, characterized in that: In the three-dimensional mesh spraying process, the spraying thickness of the thickened vegetation substrate layer is not less than 5cm, and its components include biochemical soil stabilizer, local soil, adhesive, wood fiber, and crushed material of the gradient functional ecological planting module.

8. The method for treating erosion gullies according to claim 1, characterized in that: The targeted drip irrigation maintenance specifically involves applying high-phosphorus liquid organic fertilizer, primarily to promote root development, through the drip irrigation system during the plant germination period; and switching to high-nitrogen liquid organic fertilizer, primarily to promote stem and leaf growth, during the rapid growth period of the plant.

9. The method for treating erosion gullies according to claim 1, characterized in that: The triggering condition for the structural reinforcement operation is: the settlement of the top of the composite grain mill exceeds 10% of its initial height; the reinforcement method is to lay a new corrosion-resistant and reinforced straw-based composite roll on the top of the structure and re-tension and fix it.

10. A method for treating erosion gullies according to claim 1, characterized in that: All the main materials used in the method, including the corrosion-resistant and reinforced straw-based composite roll, the outer covering layer of the gradient functional ecological planting module, and the three-dimensional net, are materials that can be completely biodegraded in the natural environment.

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