A lawn regulation and storage system applied to a sponge airport and a construction method thereof

Abstract

This invention belongs to the field of sponge airport construction engineering technology, and discloses a lawn water retention system and its construction method for use in sponge airports. The lawn water retention system includes: a lawn water retention system installed beside the runway, comprising a primary lawn runoff system, a secondary lawn infiltration system, and a tertiary vegetated swale storage system; the primary lawn runoff system is used to quickly drain rainwater from the airport runway surface; the secondary lawn infiltration system is used to reduce surface runoff and infiltrate surface rainfall; the tertiary vegetated swale storage system utilizes surface runoff stored in depressions. This invention innovatively introduces retention channels to achieve a physical separation between the airport runway and the lawn infiltration system, avoiding runoff accumulation caused by the inability to quickly drain surface water under extreme rainfall conditions; simultaneously, this invention innovatively makes full use of the surface depressions at the edge of the airport lawn to establish a vegetated swale system, and the stored rainwater can also be used for daily irrigation.

Description

Technical Field

[0001] This invention belongs to the field of sponge airport construction engineering technology, and in particular relates to a lawn water storage system and its construction method for use in sponge airports. Background Technology

[0002] The concept of sponge city management has strengthened urban planning, design, and construction. In recent years, the construction of sponge airports has received widespread attention. Traditional airport construction uses large-area hardening methods, which, in the face of frequent rainstorms, can easily cause water film to form on airport runways, and in severe cases, can even cause serious water accumulation on the apron, affecting the safe and efficient operation of the airport.

[0003] Many airports are incorporating the concept of sponge cities during their construction, creating "four-type airports" that are safe, green, smart, and people-oriented. This improves airport drainage and flood control capabilities, reduces airport runoff pollution load, and enhances the efficiency of rainwater resource utilization. Traditional airport lawns are planted with ordinary yellow soil, which has limited soil infiltration capacity and lacks rainwater retention and infiltration effects. This makes it difficult to effectively reduce surface runoff and weakens the ability to cope with extreme weather such as heavy rain, easily leading to runway flooding and threatening the safe operation of the airport.

[0004] Therefore, how to utilize the large area of ​​lawn in the aircraft area to construct a lawn regulation and storage system that integrates rainwater infiltration, storage, and reuse, so as to meet the functions of "infiltration, retention, storage, purification, utilization, and drainage" of a sponge airport and minimize the impact on site development, is an urgent problem to be solved.

[0005] Based on the above analysis, the problems and shortcomings of the existing technology are as follows:

[0006] (1) Existing technologies cannot effectively separate the runway from the grass storage system in the rapid drainage of water accumulation on the airport runway, thus failing to effectively prevent water accumulation on the airport runway.

[0007] (2) Existing technologies cannot effectively increase the resistance of surface rainwater flow, reduce the peak runoff of lawn floods, and improve the efficiency of rainwater storage and infiltration.

[0008] (3) Existing technology does not utilize the surface depressions formed by grassed swales to store a large amount of rainwater and improve rainwater utilization. Summary of the Invention

[0009] To overcome the problems existing in related technologies, the present invention discloses an embodiment of a lawn storage system and its construction method for use in sponge airports. The purpose of the present invention is to combine the concept of sponge city construction with the lawn in the flight area, effectively utilize the storage capacity of large-area lawns in airports, reduce the peak surface runoff, and avoid runway water accumulation that threatens flight safety.

[0010] The technical solution is as follows: a lawn water storage system for sponge airports, including a runway, with a lawn water storage system installed beside the runway, the lawn water storage system including a primary lawn runoff system, a secondary lawn infiltration system and a tertiary grassed swale storage system;

[0011] The primary lawn runoff system is used to quickly remove rainwater from the airport runway surface, and the runway is physically separated from the secondary lawn infiltration system by the retention channels, so as to remove surface runoff from the runway surface under extreme rainfall conditions.

[0012] The secondary turf infiltration system utilizes fine-rooted turf to increase surface runoff resistance, reduce surface runoff, and infiltrate surface rainfall.

[0013] The three-level vegetated swale storage system utilizes surface depressions to store surface runoff that the primary and secondary lawn runoff storage systems cannot store during rainfall, and then uses the rainwater to irrigate the lawn after the rainfall ends.

[0014] In one embodiment, the retention channel is composed of permeable bricks, with a filter screen on top and a water level sensor inside; the retention channel is used to store rainwater from the running track and surface runoff, and slowly releases the rainwater through the permeable bricks after rainfall to irrigate the lawn; the water level sensor is used to capture changes in the water level in the retention channel and feed them back to the smart terminal.

[0015] In one embodiment, a smart gate valve is arranged at the bottom of the stagnant water channel. The smart gate valve is connected to the drainage pipe through an overflow pipe. A water level sensor transmits the water level rise rate to a smart terminal in real time. When the water level rise rate is too fast, the smart terminal opens the smart gate valve to discharge the stagnant water channel into the drainage pipe through the overflow pipe.

[0016] In one embodiment, the primary lawn runoff system further includes a vegetation layer A and a soil layer A; the vegetation layer A is planted with ground cover grass (Pennisetum purpureum) at a seeding rate of 10-15 g / m². 2 The planting soil layer A is composed of 85% very fine sand, 10% yellow soil, and 5% peat soil, and its thickness is 300-400 mm; the particle size of the very fine sand is 50-100 mm. .

[0017] In one embodiment, the secondary lawn infiltration system consists of a vegetation layer B and a soil layer B; the vegetation layer B is planted with Dichondra repens, and the seeding rate is 10-15 g / m². 2 The planting soil layer B is composed of a mixture of 75% fine sand, 20% yellow soil, and 5% peat soil, and has a thickness of 300-400 mm; the fine sand has a particle size of 100-250 g / m². .

[0018] In one embodiment, the three-tiered vegetated swale storage system consists of a vegetation layer C and a soil layer C; the vegetation layer C is planted with Kentucky bluegrass at a seeding rate of 15-20 g / m². 2 The planting soil layer C is composed of a mixture of 50% fine sand, 45% yellow soil, and 5% peat soil, and has a thickness of 300-400 mm; the fine sand has a particle size of 100-250 g / m². .

[0019] In one embodiment, the lawn water storage system consists of a water storage layer, an infiltration layer, multiple soil layers, and multiple green vegetation layers from bottom to top.

[0020] The multi-segment planting soil layer includes planting soil layer A, planting soil layer B and planting soil layer C;

[0021] The multi-layered greening system includes greening layer A, greening layer B, and greening layer C.

[0022] In one embodiment, the water storage layer is composed of a mixture of 25% sandy loam, 25% perlite, and 50% coconut coir, and the thickness of the water storage layer is 200 mm.

[0023] In one embodiment, the seepage layer is composed of a mixture of 20% peat, 75% vermiculite, and 5% biochar, and the thickness of the seepage layer is 400-500 mm.

[0024] Another object of the present invention is to provide a construction method for a lawn water storage system applied to a sponge airport, the construction method comprising the following steps:

[0025] S101, Lawn laying foundation treatment, the longitudinal slope of the lawn laying shall not be less than 1.5%, the three-level grass swale storage system shall be excavated, the bottom shall be cleaned and compacted, and drainage pipes shall be installed at the bottom of the three-level grass swale storage system.

[0026] S102, After the foundation treatment is completed, the retention ditch is constructed. The retention ditch is constructed entirely with permeable bricks. The height of the retention ditch cannot exceed the topsoil layer A.

[0027] S103, lay the water storage layer and seepage layer, prepare the required soil, mix it evenly and lay it in layers;

[0028] S104. The construction of multiple planting layers is divided by the retention channel. The planting soil is mixed evenly, and the planting layer A is constructed first. The longitudinal slope of planting layer A is not less than 1.5% after construction. Then the planting layer B is constructed. The longitudinal slope of planting layer B is not less than 1.5% after construction. Finally, the planting layer C is constructed.

[0029] S105: After the construction of multiple soil layers is completed, multiple green plant layers are planted. When planting, the sowing amount is carried out according to the different sections, and watering is carried out after sowing.

[0030] Combining all the above technical solutions, the advantages and positive effects of this invention are as follows:

[0031] (1) The present invention establishes a primary lawn runoff system. The thicker above-ground stems of the ground cover grass and the surface soil layer can effectively reduce the surface runoff flow resistance, so that rainwater can flow out of the primary lawn runoff system quickly, achieving the purpose of rapid drainage of water accumulation on the airport runway. At the same time, a retention channel is set up to separate the runway from the secondary lawn water storage system, effectively avoiding water accumulation on the airport runway.

[0032] (2) The present invention utilizes the fine root structure of less than 1 mm formed by the green layer of Dichondra repens in the secondary lawn infiltration system, which can greatly increase the resistance of surface rainwater flow, reduce the peak runoff of lawn floods, and improve the rainwater infiltration efficiency.

[0033] (3) The present invention sets up a three-level grass swale storage system. The surface depressions formed by the grass swales can store a large amount of rainwater, which can be used to irrigate the lawn after the rainfall ends, thereby improving the rainwater utilization rate.

[0034] (4) The present invention innovatively introduces a retention channel to achieve physical separation between the airport runway and the lawn infiltration system, avoiding the runway water accumulation caused by the inability of surface runoff to drain quickly under extreme rainfall conditions; the fine-rooted lawn of the lawn infiltration system can increase the surface runoff resistance and reduce runoff peak; at the same time, the present invention innovatively makes full use of the surface depressions at the edge of the airport lawn to establish a grass swale system, and the stored rainwater can also be used for daily irrigation.

[0035] (5) This invention can collect rainwater from lawns and airport runways in retention ditches and vegetated swales for daily lawn irrigation, reducing airport irrigation water costs. The lawn infiltration system can store a large amount of rainwater, reduce surface runoff peaks, and alleviate the load on the airport drainage system. At the same time, the airport lawns and runways have a large area and generate a large amount of surface runoff. The reduction rate of COD, TN, and TP in rainwater runoff is between 30% and 60%, which can save sewage treatment costs. The annual savings in sewage treatment costs are considerable.

[0036] (6) Existing technology for airport lawns has not yet established an applicable lawn water storage system and construction method, and still adopts the traditional turf paving form, which makes it difficult to make full use of the "sponge" properties of the lawn. This technical solution can fully utilize the "sponge" properties of airport lawns, and use airport lawns to realize an integrated water storage system that combines rapid drainage, infiltration and reuse of rainwater. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure;

[0038] Figure 1 This is a schematic diagram of a lawn water storage system for sponge airports provided in an embodiment of the present invention;

[0039] Figure 2 This is a flowchart of the construction method for a lawn water storage system applied to a sponge airport, provided in an embodiment of the present invention.

[0040] Figure 3 This is a schematic diagram of different lawn surface runoff coefficients provided in the embodiments of the present invention;

[0041] Figure 4 This is a schematic diagram of the soil saturated hydraulic conductivity of soil layers A, B, and C provided in an embodiment of the present invention.

[0042] In the diagram: 1. Running track; 2. Primary turf runoff system; 201. Vegetation layer A; 202. Soil layer A; 203. Retention ditch; 204. Water level sensor; 205. Smart gate valve; 206. Permeable brick; 207. Filter screen; 208. Overflow pipe; 3. Secondary turf infiltration system; 301. Vegetation layer B; 302. Soil layer B; 4. Tertiary vegetated swale storage system; 401. Vegetation layer C; 402. Soil layer C; 5. Drainage pipe; 6. Water storage layer; 7. Infiltration layer. Detailed Implementation

[0043] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] Example 1, such as Figure 1 As shown in the figure, this invention provides a lawn water retention system for a sponge airport, including a runway 1 and a lawn water retention system. The lawn water retention system is located beside the airport runway 1 and is divided into three levels: a primary lawn runoff system 2, a secondary lawn infiltration system 3, and a tertiary vegetated swale storage system 4. The primary lawn runoff system 2 is used to quickly drain rainwater from the airport runway 1 surface, preventing water accumulation on the runway 1 and affecting aircraft takeoff and landing. The secondary lawn infiltration system 3 can reduce surface runoff and efficiently infiltrate surface rainfall. The tertiary vegetated swale storage system 4 can store rainwater that the primary lawn runoff system 2 and the secondary lawn infiltration system 3 cannot store during extreme rainfall, and can also be used for daily lawn irrigation.

[0045] The primary lawn runoff system 2 includes a green layer A201, a soil layer A202, a retention channel 203, a water level sensor 204, and an intelligent gate valve 205.

[0046] In this embodiment of the invention, the grass species planted in the green layer A201 is creeping foxtail grass, with a sowing rate of 10-15 g / m². 2 The soil layer A202 consists of 85% very fine sand and 50-100 g / m³ of other materials. It is composed of 10% yellow soil and 5% peat soil. The thickness of the planting layer A202 is 300-400mm. The green planting layer A201 can form a relatively thick above-ground stem on the surface of the primary lawn runoff system 2. While effectively storing rainwater, it does not affect surface runoff and can effectively drain rainwater from the airport runoff surface 1.

[0047] In this embodiment of the invention, the retention channel 203 is composed of permeable bricks 206, with a filter screen 207 arranged on top, and a water level sensor 204 is installed inside the retention channel 203. The retention channel 203 is used to store rainwater from the running track 1 and surface runoff, and slowly releases the rainwater through the permeable bricks 206 after rainfall to irrigate the lawn;

[0048] The water level sensor 204 is used to capture changes in the water level in the retention channel 203 and feed them back to the smart terminal; a smart gate valve 205 is arranged at the bottom of the retention channel 203, and the smart gate valve 205 is connected to the drainage pipe 5 through the overflow pipe 208.

[0049] In this embodiment of the invention, the water level sensor 204 transmits the water level rise rate to the smart terminal in real time. When the water level rise rate is too fast, the smart terminal opens the smart gate valve 205 to discharge the stagnant water channel 203 into the drainage pipe 5 through the overflow pipe 208, so as to avoid the stagnant water channel 203 from being filled and causing water accumulation on the lawn and road.

[0050] In the above scheme, the primary lawn runoff system 2 and the secondary lawn infiltration system 3 are separated by the retention channel 203, which realizes the isolation function between the airport runway 1 and the secondary lawn infiltration system 3, and avoids the impact of the secondary lawn infiltration system 3 on the airport runway 1 during the flow storage process.

[0051] In the above scheme, the retention ditch 203 is hollow inside, which can store some of the rainwater from the primary lawn runoff system 2, effectively reducing surface runoff. At the same time, in the event of extreme rainfall such as heavy rain, a large amount of rainwater rushes into the airport runway 1 in a short period of time. The water level sensor 204 detects the water level change in the retention ditch 203, and the smart terminal opens the smart gate valve 205 to discharge the retention ditch 203 into the drainage pipe 5 through the overflow pipe 208, so as to achieve the function of rapid drainage of rainwater from the airport pavement.

[0052] In this embodiment of the invention, the secondary lawn infiltration system 3 consists of a green vegetation layer B301 and a soil layer B302; the secondary lawn infiltration system 3 can store a large amount of rainwater on the surface without affecting the primary lawn runoff system 2 and the running track 1;

[0053] The B301 green layer of the secondary lawn infiltration system 3 is planted with Dichondra repens grass, at a seeding rate of 10-15 g / m². 2 The soil layer B302 consists of 75% fine sand at a density of 100-250 g / L. It is composed of 20% yellow soil and 5% peat soil, and the thickness of the planting layer B302 is 300-400mm; the green planting layer B301 can form a fine root system, which can effectively intercept surface runoff, store a large amount of rainwater, and relieve the pressure of rainwater drainage.

[0054] In this embodiment of the invention, the three-stage vegetated swale storage system 4 consists of a green vegetation layer C401 and a soil layer C402; the green vegetation layer C401 is planted with Kentucky bluegrass at a seeding rate of 15-20 g / m². 2 The soil layer, C402, consists of 50% fine sand at a density of 100-250 g / L. The soil is composed of 45% yellow soil and 5% peat soil, and the thickness of the C402 planting layer is 300-400mm. The three-level grass swale storage system 4 utilizes surface depressions to store surface runoff that the two-level lawn infiltration system 3 cannot absorb. After rainfall, it can be used to irrigate the lawn, thereby improving rainwater utilization.

[0055] Example 2: In this embodiment of the invention, the lawn water storage system consists of a water storage layer 6, an infiltration layer 7, multiple soil layers, and multiple green vegetation layers from bottom to top.

[0056] The multiple soil layers include soil layer A202, soil layer B302 and soil layer C402;

[0057] The multi-layered greening system includes greening layer A201, greening layer B301, and greening layer C401.

[0058] In this embodiment of the invention, the water storage layer 6 is composed of 25% sandy loam, 25% perlite, and 50% coconut coir, and the thickness of the water storage layer 6 is 200mm.

[0059] In this embodiment of the invention, the seepage layer 7 is composed of 20% peat, 75% vermiculite and 5% biochar, and the thickness of the seepage layer 7 is 400~500mm.

[0060] Example 3, as Figure 2 As shown in the figure, an embodiment of the present invention provides a construction method for a lawn water storage system in a sponge airport, including the following steps:

[0061] S101, Lawn laying foundation treatment, according to design requirements, the longitudinal slope of the lawn laying should not be less than 1.5%, the three-level grass swale storage system 4 should be excavated according to design requirements, the bottom should be cleaned and compacted, and drainage pipe 5 should be installed at the bottom of the three-level grass swale storage system 4.

[0062] S102, After the foundation treatment is completed, the retention ditch 203 is constructed. The retention ditch 203 should be constructed entirely with permeable bricks 206. The height of the retention ditch 203 should not exceed the soil layer A202.

[0063] S103, lay the water storage layer 6 and the seepage layer 7, prepare the required soil according to the design requirements, mix them evenly and lay them in layers;

[0064] S104, the construction of the multi-segment planting soil layer is divided by the retention ditch 203. According to the design, the planting soil is first prepared and mixed evenly. Then, the planting soil layer A202 is constructed. After the construction of the planting soil layer A202, the longitudinal slope should not be less than 1.5%. Then, the planting soil layer B302 is constructed, while ensuring that the longitudinal slope of the planting soil layer B302 is not less than 1.5%. Finally, the planting soil layer C402 is constructed. After the construction of the three-level grassed swale storage system 4, the depth should meet the design requirements.

[0065] S105. After the construction of multiple soil layers is completed, multiple green plant layers will be planted. When planting, the sowing should be carried out strictly in accordance with the designed sowing quantity. After sowing, watering should be carried out in time to ensure the survival rate.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0067] To further demonstrate the positive effects of the above embodiments, the present invention conducts the following experiments based on the above technical solutions.

[0068] Experiment 1: In this experiment, healthy ground cover grasses such as Napier grass, Dichondra repens, and Kentucky bluegrass were selected and transplanted into three experimental areas enclosed by PVC boards, each measuring 1m x 1m. At the same time, a control group of bare ground without grass was set up. The experimental areas were placed on an experimental platform with a slope of 1.5%. Holes were made in the PVC board on the lower side, and collection pipes were installed. The collection pipes were connected to measuring cylinders to collect and measure surface runoff.

[0069] This invention conducted an experiment on the impact of vegetation on surface runoff by simulating rainfall. The simulated rainfall was conducted with an average rainfall intensity of 100 mm / h. Surface runoff was collected 30 minutes after the rainfall. To avoid errors from a single experiment, the experiment was conducted three times. To ensure that the soil moisture was the same before each rainfall, the rainfall was spaced seven days apart and kept under the same dry conditions indoors. The average value was taken after three repeated experiments.

[0070] Figure 3 The graph shows the surface runoff coefficients for different lawn types. As can be seen, the fine-rooted Dichondra repens has the lowest surface runoff coefficient. This fine-rooted Dichondra repens forms a larger area of ​​soil compaction, increasing surface flow resistance. Simultaneously, the finer roots improve root distribution in the soil, allowing the obstructed surface runoff to infiltrate more easily. In contrast, the coarser Napier grass forms a more balanced lawn runoff coefficient, retaining some water retention capacity while also providing significant surface runoff, which can meet the airport's rapid stormwater drainage requirements.

[0071] Experiment 2: This experiment used a mixture of 85% very fine sand, 10% yellow soil, and 5% peat moss as planting soil, laying layer A202; a mixture of 75% fine sand, 20% yellow soil, and 5% peat moss as planting soil, laying layer B302; and a mixture of 50% fine sand, 45% yellow soil, and 5% peat moss as planting layer C. The prepared planting soils were laid in a 1m x 1m PVC-enclosed experimental area. The thickness of each layer (A202, B302, and C402) was 300-400mm. The area was placed outdoors for 15 days to more closely resemble the soil environment of an airport lawn after a period of use.

[0072] This invention uses a soil infiltration meter to test the saturated hydraulic conductivity of three different soils. The three soil saturated hydraulic conductivity values ​​are as follows: Figure 4 As shown in the figure, the A202 topsoil layer, due to its high proportion of ultrafine sand, clogs the surface soil pores, resulting in a low saturated hydraulic conductivity. However, the fine sand also prevents the surface soil from forming a large compaction structure, which is beneficial for the rapid drainage of surface runoff and avoids water accumulation in runway 1. The B302 topsoil layer uses a relatively high proportion of fine sand, 100-250 g / L. The fine sand can form a large pore structure, which helps increase soil saturation. The coarser fine sand forms a rough surface structure on the surface, increasing the flow resistance of surface runoff, which can reduce surface runoff peaks and store more rainfall. The C402 topsoil layer uses a large amount of yellow soil, which is relatively inexpensive. For large-area grassed swales, it can reduce the cost of lawn laying while ensuring optimal soil hydraulic properties.

[0073] Practical application demonstrates that the primary lawn runoff system 2 provided in this embodiment of the invention uses grass with thicker root systems, allowing rainwater from the airport runway 1 to be quickly discharged. The retention ditch 203 can store a small amount of rainwater, which, upon entering the retention ditch 203, can slowly irrigate the lawn through permeable bricks 206. The retention ditch 203 includes intelligent facilities that can adjust the drainage volume according to rainfall intensity. The secondary lawn infiltration system plants fine-rooted grasses, which have high interception efficiency for surface rainwater runoff and can improve the lawn's infiltration capacity. Excess rainwater flows into the tertiary vegetated swale storage system 4 and can be used for daily lawn irrigation. This system can solve the problem of water accumulation on the airport runway 1 during extreme weather. During heavy rain, it can quickly drain water from the airport runway 1, reducing surface runoff peaks and volumes, while effectively storing rainwater and improving rainwater utilization.

[0074] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lawn water storage system for sponge airports, comprising a runway (1), characterized in that, A lawn regulation and storage system is set up next to the running track (1). The lawn regulation and storage system includes a primary lawn runoff system (2), a secondary lawn infiltration and storage system (3), and a tertiary grass swale storage system (4). The primary lawn runoff system (2) is used to quickly drain rainwater from the runway (1) and physically separate the runway (1) from the secondary lawn infiltration system (3) through the retention ditch (203) to drain surface runoff from the runway (1) under extreme rainfall conditions. The secondary lawn infiltration system (3) utilizes fine-rooted lawns to increase surface runoff resistance, reduce surface runoff, and infiltrate rainfall; The three-level grass swale storage system (4) utilizes surface depressions to store surface runoff that cannot be stored by the primary lawn runoff system (2) and the secondary lawn infiltration system (3) during rainfall, and uses the rainwater to irrigate the lawn after the rainfall ends.

2. The lawn water storage system for sponge airports according to claim 1, characterized in that, The retention channel (203) is composed of permeable bricks (206), and a filter screen (207) is arranged on the top of the retention channel (203). A water level sensor (204) is arranged inside the retention channel (203) to capture water level changes in the retention channel (203) and feed them back to the smart terminal.

3. The lawn water storage system for sponge airports according to claim 2, characterized in that, The bottom of the retention channel (203) is equipped with an intelligent gate valve (205). The intelligent gate valve (205) is connected to the drainage pipe (5) through the overflow pipe (208). The water level sensor (204) transmits the water level rise rate to the intelligent terminal in real time. When the water level rise rate is too fast, the intelligent terminal opens the intelligent gate valve (205) to discharge the retention channel (203) into the drainage pipe (5) through the overflow pipe (208).

4. The lawn water storage system for sponge airports according to claim 1, characterized in that, The primary lawn runoff system (2) includes a green vegetation layer A (201) and a soil layer A (202). The green vegetation layer A (201) is planted with ground cover grass (Pennisetum purpureum) at a seeding rate of 10-15 g / m². 2 The planting soil layer A (202) is composed of 85% very fine sand, 10% yellow soil and 5% peat soil, and the thickness of the planting soil layer A (202) is 300-400 mm; the particle size of the very fine sand is 50-100 mm. .

5. The lawn water storage system for sponge airports according to claim 1, characterized in that, The secondary lawn infiltration system (3) consists of a green vegetation layer B (301) and a soil layer B (302); The grass species planted in the green layer B (301) is Dichondra repens, with a sowing rate of 10-15 g / m². 2 The planting soil layer B (302) is composed of 75% fine sand, 20% yellow soil and 5% peat soil, and the thickness of the planting soil layer B (302) is 300-400 mm; the particle size of the fine sand is 100-250 g / mm. .

6. The lawn water storage system for sponge airports according to claim 1, characterized in that, The three-level vegetated swale storage system (4) consists of a green vegetation layer C (401) and a soil layer C (402); the green vegetation layer C (401) is planted with Kentucky bluegrass, and the seeding rate is 15~20g / m². 2 The planting soil layer C (402) is composed of 50% fine sand, 45% yellow soil and 5% peat soil, and the thickness of the planting soil layer C (402) is 300-400 mm; the particle size of the fine sand is 100-250 g / mm. .

7. The lawn water storage system for sponge airports according to claim 1, characterized in that, The lawn regulation system consists of a water storage layer (6), an infiltration layer (7), multiple soil layers, and multiple green vegetation layers from bottom to top. The multi-segment planting layers include planting layer A (202), planting layer B (302) and planting layer C (402). The multi-layered greening includes greening layer A (201), greening layer B (301) and greening layer C (401).

8. The lawn water storage system for sponge airports according to claim 7, characterized in that, The water storage layer (6) is composed of 25% sandy loam, 25% perlite and 50% coconut coir.

9. The lawn water storage system for sponge airports according to claim 7, characterized in that, The seepage layer (7) is composed of 20% peat soil, 75% vermiculite and 5% biochar, and the thickness of the seepage layer (7) is 400~500mm.

10. A method for constructing a lawn water storage system for sponge airports, characterized in that, The construction method for implementing the lawn water storage system for sponge airports according to any one of claims 1 to 9 includes the following steps: S101, the foundation treatment for lawn laying, the longitudinal slope of lawn laying shall not be less than 1.5%, the three-level grass swale storage system (4) shall be excavated, the bottom shall be cleaned and compacted, and a drainage pipe (5) shall be installed at the bottom of the three-level grass swale storage system (4). S102, after the foundation treatment is completed, the retention channel (203) is constructed. The retention channel (203) is constructed entirely with permeable bricks (206). The height of the retention channel (203) cannot exceed the soil layer A (202). S103, lay the water storage layer (6) and the seepage layer (7), prepare the required soil, mix it evenly and lay it in layers; S104, the construction of multiple planting layers takes the retention channel (203) as the dividing line, and the planting soil is mixed evenly. First, the planting layer A (202) is constructed. After the construction of planting layer A (202), the longitudinal slope is not less than 1.5%. Then, the planting layer B (302) is constructed. After the construction of planting layer B (302), the longitudinal slope is not less than 1.5%. Finally, the planting layer C (402) is constructed. S105: After the construction of multiple soil layers is completed, multiple green plant layers are planted. When planting, the sowing amount is carried out according to the different sections, and watering is carried out after sowing.

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