Coastal beach quicksand prevention maintenance method and experimental device

Abstract

The invention discloses a coastal sand beach quicksand prevention maintenance method and an experimental device, and relates to the technical field of coastal ecological restoration and beach maintenance engineering.The method comprises the steps that firstly, a water absorption module is arranged below a sand layer of a sand beach simulation system, and an unsaturated area is formed in the sand layer near the water absorption module through the water pumping effect of the water absorption module; then in the water absorption process of the water absorption module, tide simulation and wave simulation are carried out on the sand beach simulation system in a matched mode; and finally, according to the water absorption effect of the water absorption module and the sand bed state of the sand beach simulation system, the anti-quicksand experiment effect is judged. The sand beach simulation system comprises a wave-making section, an experiment section and a wave-eliminating section which are sequentially communicated and arranged; the water suction module comprises a water suction pipe laid below the sand layer, water suction holes are formed in the water suction pipe, and the water suction pipe is connected with a water suction pump. The sand drifting phenomenon and the solution of the sand beach under the natural condition can be comprehensively simulated, and the experiment condition close to the reality is provided for research.

Description

Technical Field

[0001] The invention relates to the technical field of coastal ecological restoration and beach maintenance engineering, and more specifically to a coastal beach quicksand prevention maintenance method and an experimental device. Background Art

[0002] The problem of quicksand on coastal beaches has always been a major challenge in the field of marine engineering and ecological protection. The quicksand phenomenon not only causes beach erosion and coastline retreat, but also destroys the habitat of marine organisms, affecting the ecological environment and economic development of coastal areas. In order to cope with this problem, traditional coastal beach quicksand prevention systems usually need to comprehensively consider multiple complex factors such as waves, tides, wind, sediment movement, and groundwater levels. However, these systems are often large-scale, costly, and require complex engineering technology to implement. For example, although traditional methods such as breakwaters, revetment projects, and artificial sand replenishment can alleviate beach erosion to a certain extent, they have many disadvantages, such as damage to the natural landscape, negative impacts on the marine ecosystem, and high construction and maintenance costs. In addition, these methods are often difficult to adapt to the dynamically changing natural environment and cannot fundamentally solve the problem of quicksand on the beach.

[0003] Given the complexity and difficulty of implementing the anti-sand system on coastal beaches, carrying out large-scale anti-sand projects directly in actual coastal environments is not only costly but also risky. Therefore, laboratory research has become a key step in exploring and verifying new anti-sand technologies. Through laboratory simulation experiments, the formation mechanism of beach quicksand phenomena can be studied under controllable conditions, the feasibility of new anti-sand technologies can be verified, and relevant parameters can be optimized. Laboratory research can not only reduce research costs, but also reduce interference with the natural environment, providing scientific basis and technical support for practical engineering applications.

[0004] Although laboratory simulation is of great significance in coastal beach research, existing simulation methods and devices still have many shortcomings. First, most of the existing simulation experiments focus on the study of a single factor (such as waves or tides), while ignoring the impact of key factors such as groundwater level and sand layer porosity on beach stability. Secondly, existing experimental devices often lack dynamic control capabilities and are difficult to simulate the dynamic changes of beaches in natural environments. In addition, the scalability of existing experimental methods is poor, and the experimental results are difficult to directly apply to actual projects. Therefore, the development of an experimental method and device that can fully simulate the phenomenon of beach quicksand under natural conditions is of great significance to promoting the development of coastal beach quicksand prevention technology. Summary of the invention

[0005] In view of this, the present invention provides a maintenance method and experimental device for preventing quicksand on a coastal beach, aiming to solve the above technical problems.

[0006] In the prior art, the simplest way to solve the problem of beach loss is to use artificial transportation to directly replenish sand. However, the direct sand replenishment method has the following problems in practice:

[0007] First of all, direct sand replenishment requires a large amount of sand. According to the Mineral Resources Law of the People's Republic of China, sand is a mineral resource and cannot be mined at will. This means that obtaining the sand needed for sand replenishment requires legal channels, which not only involves high costs, but also includes labor costs and transportation costs, and the overall cost is far higher than expected.

[0008] Secondly, it is not ordinary yellow sand that is suitable for beach sand replenishment. If the selected sand particle size is not appropriate, it will aggravate the erosion of local beaches. This requires selecting sand with appropriate particle size according to the natural environment of the beach. The market price of sand with a specific particle size is as high as nearly 800 yuan per ton, and the cost of sand replenishment is extremely high. For example, Hailong Bay Beach in Rizhao City, Shandong Province, is the first port shoreline restoration and improvement project in my country to "return the port to the sea". The project has an investment of 610 million yuan, 1,882 meters of shoreline have been restored, and 460,000 square meters of beach area have been added. In addition, if there are extreme weather such as strong storms and waves after sand replenishment, the newly added sand may be quickly washed away, resulting in the previous investment going down the drain, and it may also cause damage to the surrounding marine ecological environment.

[0009] Furthermore, according to the "Coastline Protection and Utilization Management Measures", artificial reclamation including sand replenishment has been prohibited, so it is impossible to expand the coastline by artificial means, and direct sand replenishment is naturally difficult to implement. Moreover, the approval process for sand replenishment construction on the coastline is strict, and various environmental impact assessments are also extremely cumbersome. In the approval process, detailed construction plans, environmental impact assessment reports, ecological restoration plans and other materials need to be submitted to multiple departments, including marine management departments, environmental protection departments, fishery departments, etc. These departments will conduct strict reviews of sand replenishment projects from different angles. Water construction is extremely difficult, and complex marine hydrological conditions such as tides, waves, and currents need to be dealt with during the construction process. This not only increases the technical difficulty and safety risks of construction, but also leads to slow construction progress and further increases construction costs.

[0010] It can be seen that although the direct sand replenishment method looks simple, the actual operation is not only complicated but also unreliable. Therefore, in order to overcome the above problems, it is necessary to study a new solution to achieve the effect of preventing quicksand.

[0011] In order to achieve the above object, the present invention adopts the following technical solution:

[0012] A method for maintaining a coastal beach against quicksand is provided, wherein a beach simulation system is designed in a laboratory to simulate a real beach environment, and the method comprises the following means:

[0013] First, a water absorption module is arranged under the sand layer of the beach simulation system, and the sand layer near the water absorption module forms an unsaturated zone through the pumping action of the water absorption module;

[0014] Then, during the water absorption process of the water absorption module, the beach simulation system is coordinated to perform tide simulation and wave simulation;

[0015] Finally, the effect of the anti-quicksand experiment is determined according to the water absorption effect of the water absorption module and the state of the sand layer of the beach simulation system.

[0016] Through the above technical scheme, the present invention can effectively study the formation mechanism of beach quicksand phenomenon and verify the feasibility of new anti-quicksand technology by simulating the beach environment in the laboratory. Compared with large-scale anti-quicksand engineering directly on the actual coast, laboratory simulation can greatly reduce research costs and reduce interference and damage to the natural environment. By adjusting the groundwater level through the water absorption module, the dynamic changes of the beach in the natural environment can be dynamically simulated, providing experimental conditions closer to reality for research. Optimizing relevant parameters through experimental results provides scientific basis and technical support for practical engineering applications, which is conducive to the development of more effective coastal beach quicksand prevention technology.

[0017] Preferably, in the above-mentioned method for maintaining a coastal beach against quicksand, the water absorption module is arranged at the bottom of the intertidal zone of the beach during the tidal simulation process.

[0018] Preferably, in the above-mentioned coastal beach maintenance method for preventing quicksand, the water absorption module is arranged 0.3 m below the sand layer.

[0019] The present invention also provides an experimental device for preventing quicksand on a coastal beach:

[0020] The beach simulation system comprises: an experimental water tank, wherein the experimental water tank comprises a wave-making section, an experimental section and a wave-breaking section which are sequentially connected and arranged; the experimental section is used for laying sand, the wave-making section is used for making waves, and pushing the waves toward the experimental section to the wave-breaking section for wave breaking;

[0021] The water absorption module comprises a water absorption pipe laid under the sand layer, the water absorption pipe is provided with a water absorption hole, the water absorption pipe is connected with a water pump, and the water pump is arranged outside the experimental water tank.

[0022] Through the above technical scheme, the present invention integrates functions such as wave generation, tidal simulation, and water absorption, and can fully simulate the quicksand phenomenon of the beach under natural conditions. Through the water supply circulation system and the water absorption module, the experimental conditions, such as water level changes, wave frequency, etc., can be accurately controlled to improve the repeatability and accuracy of the experiment. The device affects the stability of the beach by adjusting the groundwater level, avoiding the damage to the natural landscape and ecological environment caused by traditional anti-quicksand methods (such as breakwaters and artificial sand replenishment). The device is reasonably designed, low in cost, and easy to operate and maintain, and is suitable for widespread use in laboratory environments.

[0023] Preferably, in the above-mentioned experimental device for preventing quicksand on coastal beaches, it also includes a water supply circulation system, the water supply circulation system includes a circulating water pipeline connected between the wave-making section and the wave-breaking section, the circulating water pipeline has a water tank and an ultrafiltration water purifier, the ultrafiltration water purifier is arranged close to the wave-breaking section, a water replenishment pump is provided on the pipeline between the water tank and the wave-making section, a drain valve is provided on the pipeline between the ultrafiltration water purifier and the wave-breaking section, and the water pump is connected to the ultrafiltration water purifier.

[0024] Preferably, in the above-mentioned experimental device for preventing quicksand on a coastal beach, the outer side of the water suction pipe is wrapped with a sand-blocking filter layer.

[0025] Preferably, in the above-mentioned experimental device for preventing quicksand on a coastal beach, a reciprocating wave-making push plate is provided in the wave-making section.

[0026] Preferably, in the above-mentioned experimental device for preventing quicksand on coastal beaches, multiple layers of wave-breaking cotton nets are provided in the wave-breaking section.

[0027] Preferably, in the above-mentioned experimental device for preventing quicksand on a coastal beach, a plurality of detection racks are further provided on the top edge of the experimental water tank, and wave height meters are installed on the detection racks.

[0028] Preferably, in the above-mentioned experimental device for preventing quicksand on a coastal beach, a crossbeam is provided above the experimental water tank, and a hook is slidably connected to the crossbeam, and the hook is used to transport sand for the experiment.

[0029] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a maintenance method and experimental device for preventing quicksand on coastal beaches, which can fully simulate the quicksand phenomenon on beaches under natural conditions and provide experimental conditions close to reality for research. Through laboratory simulation, the high cost and high risk of large-scale engineering practice are avoided. The dynamic changes of the beach can be dynamically simulated to provide more accurate experimental data for research. The damage to the natural landscape and ecological environment caused by traditional quicksand prevention methods is avoided, which meets the requirements of ecological protection. The device is reasonably designed, low in cost, easy to operate and maintain, and suitable for wide application. The relevant parameters are optimized through experimental results, providing scientific basis and technical support for practical engineering applications, and promoting the development of quicksand prevention technology on coastal beaches. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 The accompanying drawing is a schematic diagram of the overall system of the experimental device provided by the present invention;

[0032] Figure 2 The accompanying drawing is a schematic diagram of the overall structure of the experimental device provided by the present invention;

[0033] Figure 3 The accompanying drawing is a schematic structural diagram of a wave-making section provided by the present invention;

[0034] Figure 4 The accompanying drawing is a schematic diagram of the structure of the wave-cutting band provided by the present invention;

[0035] Figure 5 The accompanying drawing is a schematic structural diagram of a water absorption module provided by the present invention;

[0036] Figure 6 The accompanying drawing is a schematic structural diagram of the water suction pipe provided by the present invention;

[0037] Figure 7 The accompanying drawing is a schematic diagram of the structure of the detection frame provided by the present invention;

[0038] Figure 8 The accompanying drawing is a schematic structural diagram of the hook provided by the present invention.

[0039] in:

[0040] 1- Experimental water tank;

[0041] 11-wave-making section; 111-wave-making push plate; 112-linear reciprocating displacement pushing mechanism; 12-experimental section; 13-wave-breaking section; 131-wave-breaking cotton net; 14-slideway;

[0042] 2-water absorption module;

[0043] 21-water suction pipe; 211-water suction hole; 22-water pump; 23-sand blocking filter layer;

[0044] 3- Water supply circulation system;

[0045] 31-circulating water pipeline; 32-water tank; 33-ultrafiltration water purifier; 34-water supply pump; 35-drain valve;

[0046] 4-Detection rack;

[0047] 41-first slide; 42-second slide; 43-vertical pole;

[0048] 5- beam;

[0049] 51-Hook. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] See attached Figure 1 To Attachment Figure 6 The embodiment of the present invention discloses an experimental device for preventing quicksand on a coastal beach:

[0052] The beach simulation system comprises: an experimental water tank 1, wherein the experimental water tank 1 comprises a wave-making section 11, an experimental section 12 and a wave-breaking section 13 which are sequentially connected and arranged; the experimental section 12 is used for laying sand, and the wave-making section 11 is used for making waves and pushing the waves toward the experimental section 12 to the wave-breaking section 13 for wave breaking;

[0053] The water absorption module 2 includes a water absorption pipe 21 laid under the sand layer. The water absorption pipe 21 is provided with a water absorption hole 211 . The water absorption pipe 21 is connected to a water pump 22 . The water pump 22 is arranged outside the experimental water tank 1 .

[0054] The water absorption holes 211 on the water absorption pipe 21 are arranged at equal intervals, and the interval S is as follows:

[0055]

[0056] In the formula, L pipeis the length of the suction pipe, L hole is the length of the water suction hole, R is the radius of the water suction pipe, r is the radius of the water suction hole, P pipe is the internal pressure of the suction pipe, P hole is the internal pressure of the water absorption hole.

[0057] In the laying of the actual experiment, the arrangement of the suction pipe 21 is parallel to the coastline of the beach simulation system or has a certain angle α, and groundwater is extracted through the suction pipe 21 on the suction pipe 21, wherein 0°<α≤60°.

[0058] like Figure 1 As shown, it also includes a water supply circulation system 3, which includes a circulating water pipeline 31 connected between the wave-making section 11 and the wave-breaking section 13, and the circulating water pipeline 31 is provided with a water tank 32 and an ultrafiltration water purifier 33. The ultrafiltration water purifier 33 is arranged close to the wave-breaking section 13, and a water replenishment pump 34 is provided on the pipeline between the water tank 32 and the wave-making section 11, and a drain valve 35 is provided on the pipeline between the ultrafiltration water purifier 33 and the wave-breaking section 13, and a water pump 22 is connected to the ultrafiltration water purifier 33.

[0059] Through the above water supply circulation system 3, the water tank 32 is used as a water source, and water is pumped from the water tank 32 into the wave making section 11 through the water supply pump 34. When the drain valve 35 is closed, it can simulate high tide, and when the water supply pump 34 is closed and the drain valve 35 is opened, it can simulate low tide. At the same time, in the case of simulating high tide, simulating low tide or neither high tide nor low tide, wave making can be carried out in cooperation with the wave making section 11.

[0060] See attached Figure 6 , the outer side of the water suction pipe 21 is wrapped with a sand blocking filter layer 23. In this embodiment, the sand blocking filter layer 23 is a filter cotton or a filter net.

[0061] See attached Figure 3 A reciprocating wave-making push plate 111 is provided in the wave-making section 11.

[0062] In this embodiment, a linear reciprocating displacement pushing mechanism 112 is installed above the wave-making section 11. The mechanism is a conventional motor-driven lead screw slider structure, that is, the lead screw is driven by the motor to rotate, thereby causing the sliding seat threadedly connected to the lead screw to perform a linear displacement action, and the wave-making push plate 111 is fixedly connected to the sliding seat, which can drive the wave-making push plate 111 to move. The rotation speed of the motor can be controlled, and the movement frequency of the wave-making push plate 111 can be changed to control the wave-making effect.

[0063] See attached Figure 4 A multi-layer wave-absorbing cotton net 131 is provided in the wave-absorbing section 13. In this embodiment, the wave-absorbing cotton net 131 is a dense metal net structure.

[0064] See attached Figure 7A plurality of detection racks 4 are also provided on the top edge of the experimental water tank 1, and a wave height meter is installed on the detection rack 4.

[0065] In this embodiment, the detection frame 4 is a three-dimensional structure, and the top edge of the experimental water tank 1 has a slide 14, and the slide 14 is slidably connected to a first slide 41 that moves along the length direction of the experimental water tank 1, and the first slide 41 is slidably connected to a second slide 42 that is perpendicular to the length direction of the experimental water tank 1, and the second slide 42 is connected to a vertically telescopic vertical rod 43, which can also be a cylinder or a hydraulic cylinder. The wave height meter is installed at the bottom end of the vertical rod 43 and can be adjusted.

[0066] In this embodiment, there are three detection racks 4 , which are respectively installed at both ends and the middle of the experimental section 12 .

[0067] See attached Figure 8 A crossbeam 5 is provided above the experimental water tank 1, and a hook 51 is slidably connected to the crossbeam 5, and the hook 51 is used to transport sand for the experiment.

[0068] The experimental method of the experimental device for preventing quicksand on the coastal beach provided in this embodiment includes the following means:

[0069] First, a water absorption module 2 is arranged under the sand layer of the beach simulation system, and the sand layer near the water absorption module 2 forms an unsaturated zone through the pumping action of the water absorption module 2;

[0070] Then, during the water absorption process of the water absorption module 2, the beach simulation system is coordinated to perform tide simulation and wave simulation;

[0071] Finally, the effect of the anti-quicksand experiment is determined based on the water absorption effect of the water absorption module 2 and the state of the sand layer of the beach simulation system.

[0072] In this embodiment, the water absorption module 2 is arranged at the bottom of the intertidal zone of the beach during the tidal simulation process.

[0073] In this embodiment, the water absorption module 2 is arranged 0.3 m below the sand layer.

[0074] The principle of the maintenance method for preventing quicksand on the coastal beach provided in this embodiment is as follows: by controlling the water absorption of the water absorption module 2 inside the sand layer in the intertidal zone of the beach, the distribution of the groundwater level can be adjusted, the unsaturated area of ​​the sand layer of the beach can be expanded to form an unsaturated strip parallel to the coastline, and the lowest water level point can be formed near the water absorption module 2, thereby increasing the adsorption and friction force on the surface sand, so that the sand is naturally deposited on the beach shoulder. By regulating the groundwater level and thus affecting the state of sand transport on the beach, the groundwater is kept unsaturated during large waves or high tides, the suspension of sediment and the concentration of suspended sand are reduced, the erosion of the beach is delayed, and the stability of the beach during large waves or high tides is improved. The beach will form storm profiles and non-storm profiles according to the season. In the storm season, waves cause beach erosion, and sediment is transported offshore, resulting in a narrowing of the beach width; while in the non-storm season, sand will slowly be transported from underwater to the beach shoulder, naturally silted up, and the beach will become wider.

[0075] Based on the basic principles of hydrodynamic characteristics, this technology allows the beach to recover itself in the natural dynamic process of the interaction of waves, currents, sand and groundwater, thereby protecting the coast. No rigid protective structure is set up, thus avoiding changes to the natural landscape of the coast, and does not hinder the natural exchange of seawater and beach, with minimal impact on the environment. This technology has no impact on the landscape, does not change the natural landscape, maintains the original style of the coast, and provides a guarantee for ecotourism and the stability of the marine ecosystem. It does not hinder the exchange of seawater, ensures the normal circulation of the marine ecosystem, and is conducive to the survival and reproduction of marine organisms. The construction cost is low, and no expensive professional marine engineering technology and equipment are required, which reduces the economic investment in coastal protection. The construction difficulty is simple and can be implemented quickly, reducing the construction period and labor costs. In practical applications, by rationally planning the coastal area and taking advantage of the natural terrain and the reciprocating characteristics of water flow, the silt is moderately deposited in the beach shoulder area, promoting the natural recovery of the coastline. At the same time, it can be combined with ecological restoration measures, such as planting suitable coastal plants, to further enhance the stability and ecological function of the coast. The filtered water source has a wide range of uses, such as lagoons, entertainment facilities, aquariums, swimming pools, etc. If filtered water is not used, the seawater can be returned to the sea by utilizing the potential energy of gravity through the terrain difference or by using a water pump.

[0076] Embodiment 1:

[0077] The simulated environment in the laboratory is actually almost the same as the real beach environment. In this experiment, the "Technical Specifications for Simulation Tests of Water Transport Engineering" (JTS / T231-2021) was strictly followed, and the Froude Similarity Criterion was mainly used. When constructing the experimental model, model sand was specially selected to ensure that the sediment start-up was similar, and key factors such as the sediment settling velocity ratio were fully considered.

[0078] For example, the burial depth in the model needs to be accurately determined according to the geometric scale of the model to restore the real beach environment to the greatest extent. In addition, the present invention is specifically for sandy coasts. The porosity of sand is about 0.4. Even if it is compacted, there are still pores between the sand on the sandy coast, and water can penetrate naturally.

[0079] Selecting an appropriate model scale can ensure the accuracy of the simulated flow characteristics. For fluid mechanics research, it is necessary to ensure that the Reynolds number and other important dimensionless parameters are consistent between the prototype and the model. The model scale for the overall physical model test has the following regulations: the overall physical model length scale should not be greater than 150; the original incident wave of the model, the effective wave height of the irregular wave should not be less than 2cm, and the spectrum peak period should not be less than 0.8s; the model scale is determined based on the wave-making capacity of the wave maker, the test tank and the building structure scale, and the measurement accuracy of the test instrument, and the test conditions should be fully utilized, and a smaller model scale should be used. Model test design should be based on similarity theory and dimensional analysis, and the corresponding similarity criteria should be followed between the model and the prototype.

[0080] Froude similarity criterion (also called gravity similarity criterion):

[0081] When water flows through the beach area, gravity is the main force. By replacing F in Newton's law with gravity, the similarity criterion under gravity can be obtained. The Froude number between the model and the prototype must be equal.

[0082] Gravity can be expressed as:

[0083]

[0084] Newton's Laws:

[0085]

[0086] The scale format is:

[0087]

[0088]

[0089] Depend on ,have to:

[0090]

[0091] because ,

[0092] Flow rate scale:

[0093]

[0094] Time scale:

[0095]

[0096] Length scale:

[0097]

[0098] Pressure scale:

[0099]

[0100] Force scale:

[0101]

[0102] Where L0 is the prototype length of the building; L m is the length of the building model.

[0103] like Figure 1 and Figure 2 As shown, firstly, an experimental water tank 1 with a length of 48.5 m, a width of 0.8 m, and a height of 1.5 m is set up. The water tank supports experimental requirements under various conditions such as stable water flow, waves, and interaction between waves and water flow (wave-current coupling). Thereafter, a sand layer is laid in the water tank and water is poured in; then, a water suction pipe 21 and a water pump 22 are set up, and one end of the water suction pipe 21 is connected to the water pump 22.

[0104] During the experiment, the suction pipe 21 was buried at a position of 0.3m below the sand layer (simulated at a scale of 1:10). In the initial stage, the water level in the water tank was in a relatively stable state. At this time, the water in the sand layer was saturated or nearly saturated, the gaps between the sand particles were filled with water, and the sand layer around the suction pipe of the water pump was also soaked by water. When the water pump 22 was started, due to the suction force of the suction pipe 21, the water in the pores of the surrounding sand layer would be sucked first, and the water would be quickly sucked into the suction pipe 21, causing the sand layer around the suction pipe 21 to partially saturate. A decrease in water pressure occurred; subsequently, as the water in the sand layer was continuously sucked into the suction pipe, the water level in the water tank began to drop rapidly. In this process, the water in the sand layer formed a seepage layer that flowed toward the suction pipe 21; as the water level continued to drop, the water in the sand layer far away from the suction pipe 21 would slowly flow to the location of the suction pipe 21 for replenishment under the dual effects of gravity and hydraulic gradient. At this time, the sand layer around the suction pipe had become relatively dry, and the remaining water in the water tank was mainly concentrated in the area far away from the suction pipe 21 or at the bottom of the sand layer.

[0105] Experiments have shown that the system of this embodiment can effectively reduce the water level in the sand layer and expand the range of the unsaturated zone of the water body in the sand layer.

[0106] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0107] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for maintaining a coastal beach against quicksand, characterized in that: A beach simulation system is designed in the laboratory to simulate the real beach environment. The method includes the following means: Firstly, a water absorption module (2) is arranged under the sand layer of the beach simulation system, and the sand layer near the water absorption module (2) forms an unsaturated zone through the pumping action of the water absorption module (2); Then, during the water absorption process of the water absorption module (2), the beach simulation system is coordinated to perform tide simulation and wave simulation; Finally, the effect of the anti-sand flow experiment is determined based on the water absorption effect of the water absorption module (2) and the state of the sand layer of the beach simulation system.

2. A method for maintaining a coastal beach against quicksand according to claim 1, characterized in that: The water absorption module (2) is arranged at the bottom of the intertidal zone area of ​​the beach during the tidal simulation process.

3. A method for maintaining a coastal beach against quicksand according to claim 1, characterized in that: The water absorption module (2) is arranged 0.3 m below the sand layer.

4. An experimental device for preventing quicksand on a coastal beach, used for carrying out a method for preventing quicksand on a coastal beach as claimed in any one of claims 1 to 3, characterized in that: The beach simulation system comprises: an experimental water tank (1), wherein the experimental water tank (1) comprises a wave-making section (11), an experimental section (12) and a wave-breaking section (13) which are sequentially connected and arranged; the experimental section (12) is used for laying sand, and the wave-making section (11) is used for making waves and pushing the waves toward the experimental section (12) to the wave-breaking section (13) for wave breaking; The water absorption module (2) comprises a water absorption pipe (21) laid under the sand layer, the water absorption pipe (21) is provided with a water absorption hole (211), the water absorption pipe (21) is connected to a water pump (22), and the water pump (22) is arranged outside the experimental water tank (1).

5. The experimental device for preventing quicksand on a coastal beach according to claim 4, characterized in that: The invention also comprises a water supply circulation system (3), wherein the water supply circulation system (3) comprises a circulating water pipeline (31) connected between the wave generating section (11) and the wave dissipating section (13), wherein the circulating water pipeline (31) is provided with a water tank (32) and an ultrafiltration water purifier (33), wherein the ultrafiltration water purifier (33) is arranged close to the wave dissipating section (13), wherein a water replenishment pump (34) is provided on the pipeline between the water tank (32) and the wave generating section (11), wherein a drain valve (35) is provided on the pipeline between the ultrafiltration water purifier (33) and the wave dissipating section (13), and wherein the water pump (22) is connected to the ultrafiltration water purifier (33).

6. The experimental device for preventing quicksand on a coastal beach according to claim 4, characterized in that: The outer side of the water suction pipe (21) is wrapped with a sand blocking filter layer (23).

7. The experimental device for preventing quicksand on a coastal beach according to claim 4, characterized in that: A reciprocating wave-making push plate (111) is provided in the wave-making section (11).

8. The experimental device for preventing quicksand on a coastal beach according to claim 4, characterized in that: Multiple layers of wave-absorbing cotton nets (131) are provided in the wave-absorbing section (13).

9. The experimental device for preventing quicksand on a coastal beach according to claim 4, characterized in that: A plurality of detection racks (4) are also provided on the top edge of the experimental water tank (1), and a wave height meter is installed on the detection rack (4).

10. The experimental device for preventing quicksand on a coastal beach according to claim 4, characterized in that: A crossbeam (5) is provided above the experimental water tank (1), and a hook (51) is slidably connected to the crossbeam (5), and the hook (51) is used to transport sand for the experiment.

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