Design method and system of seawall protection structure based on coiled space metasurface technology

Abstract

The application discloses a seawall protection structure design method and system based on a winding space metasurface technology, relates to the technical field of seawall protection engineering, and comprises the following steps: selecting a suitable winding space metasurface unit model according to frequency parameters and wave height parameters of sea waves; designing and optimizing the winding space metasurface unit model based on a preset refractive index distribution; arranging and installing the designed winding space metasurface unit model array outside a seawall and debugging; and adjusting the arrangement and refractive index of the winding space metasurface unit model to cope with different sea wave conditions by monitoring sea conditions in real time. The application modulates the energy distribution of water surface waves, realizes focusing, scattering or absorption of the waves, effectively reduces the direct impact of the sea waves on the seawall, enhances the protection effect, and reduces the long-term maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seawall protection engineering, in particular to a seawall protection structure design method and system based on a wrapped spatial metasurface technology. BACKGROUND

[0002] Current seawall protection structures usually adopt traditional physical barrier methods, such as using concrete, stones and steel bars to build breakwaters to resist the impact of sea waves. However, these traditional technologies face the following challenges in practical application:

[0003] High maintenance cost: Traditional seawalls are easily damaged by wind and wave erosion, especially in extreme weather, and the maintenance and repair costs are extremely high.

[0004] Insufficient impact resistance: Existing seawalls are difficult to effectively buffer and disperse the impact force of waves, especially in extreme conditions such as typhoons and storm surges, and are easily destroyed by sea waves.

[0005] Environmental impact: Large-scale construction of reinforced concrete dams can destroy coastal ecosystems and affect marine habitats, leading to ecological imbalance.

[0006] Existing technologies attempt to introduce new materials and flexible structures to improve protection effects, such as using wave absorbers, flexible wave walls, etc., but these measures still have the problem of insufficient protection ability in the face of extreme sea conditions. Therefore, there is an urgent need for a new protection technology that can dynamically regulate wave energy to enhance the overall protection performance of seawalls.

[0007] In view of the problems in the related art, no effective solution has been proposed so far. SUMMARY

[0008] In view of the problems in the related art, the present application proposes a seawall protection structure design method and system based on a wrapped spatial metasurface technology to overcome the above technical problems existing in the prior art.

[0009] To this end, the specific technical solutions adopted by the present application are as follows:

[0010] According to one aspect of the present application, a seawall protection structure design method based on a wrapped spatial metasurface technology is provided, which comprises the following steps:

[0011] S1. Selecting an appropriate wrapped spatial metasurface unit model according to the frequency and wave height parameters of the sea waves;

[0012] S2. Designing and optimizing the wrapped spatial metasurface unit model based on a pre-set refractive index distribution;

[0013] S3, arrange and install the designed and optimized coiled space metasurface unit model array outside the seawall, and debug;

[0014] S4, adjust the placement and refractive index of the coiled space metasurface unit model to cope with different sea wave conditions by monitoring the sea conditions in real time.

[0015] Further, the design and optimization of the coiled space metasurface unit model based on the preset refractive index distribution includes the following steps:

[0016] S21, based on the requirement of the coiled space metasurface unit model, design zigzag channels and straight channels, preset geometric parameters, and construct an initial coiled space metasurface unit model design framework;

[0017] S22, based on the functional requirement of the coiled space metasurface unit model for refractive index distribution, optimize the performance of the coiled space metasurface unit model by adjusting the geometric parameters.

[0018] Further, based on the target requirement, design zigzag channels and straight channels, preset geometric parameters, and construct an initial coiled space metasurface unit model design framework, which includes the following steps:

[0019] S211, design the geometric structure of zigzag channel, prolong the wave propagation distance through the zigzag path, produce phase delay, and form high refractive index area;

[0020] S212, parallelly set straight channels to provide impedance matching path for zigzag channels, ensure the overall performance of the coiled space metasurface unit model structure, and optimize the transmission efficiency of waves;

[0021] S213, based on the frequency, wavelength and wave speed of water surface wave, and according to the proportional relationship between wave and zigzag channel geometric parameters, set initial parameters for the coiled space metasurface unit model structure;

[0022] S214, through the channel width formula, combine the relationship between the thickness of rigid plate and the number of coiled channels, and complete the parameter calculation and structure design of the coiled space metasurface unit model.

[0023] Further, based on the functional requirement of the coiled space metasurface unit model for refractive index distribution, optimize the performance of the coiled space metasurface unit model by adjusting the geometric parameters, which includes the following steps:

[0024] S221, based on the effective medium theory, control the relative refractive index distribution of the coiled space metasurface unit model by adjusting the length and width of zigzag channel, and determine the change rate of refractive index;

[0025] S222. Based on the analysis of the relationship between the relative effective refractive index and the energy transfer efficiency and the variation of the Zigzag channel length, determine the range of optimization parameters;

[0026] S223. Based on the optimization analysis results, adjust the geometric parameters of the zigzag channel to improve wave modulation efficiency and reduce phase loss;

[0027] S224. Draw a graph showing the relationship between geometric parameters and refractive index distribution to verify whether the performance of the wound space metasurface unit model meets the design requirements. If it does, proceed with the design; if not, make adjustments and improvements.

[0028] Furthermore, the formula for channel width is:

[0029] d =( a -8 w ) / N ;

[0030] In the formula, d Indicates the width of the zigzag channel; w The thickness of the rigid plate is indicated. N Indicates the number of zigzag channels; a This represents the total width of the coiled spatial metasurface unit model.

[0031] Furthermore, the formula for the refractive index distribution is:

[0032] n ( y )= n 0sech ( αy );

[0033] In the formula, n 0 represents the maximum refractive index of the metasurface unit at the center of the model array; y The distance between the coiled spatial metasurface unit model and the array center is represented by sech; sech represents the hyperbolic sine function. α This represents a constant that controls the refractive index gradient.

[0034] Furthermore, the formula for determining the rate of change of the refractive index is:

[0035] α =cosh -1 ( n 0 / n L ) / L ;

[0036] In the formula, α This represents a constant that controls the refractive index gradient; n Lrepresents the refractive index of the most marginal wrapped space metasurface unit model; n 0 represents the maximum refractive index of the metasurface unit at the center position of the model array; L represents the distance from the center of the model array to the edge; cosh represents the hyperbolic cosine function.

[0037] Further, the designed and optimized wrapped space metasurface unit model array is arranged and installed outside the seawall, and debugging is performed, including the following steps:

[0038] S31, the wrapped space metasurface unit model with high refractive index is arranged in the target area to form a focusing effect of water surface waves, the characteristics of the focusing area are measured, and the refractive index distribution is adjusted in a spherical form to observe the change of focal length;

[0039] S32, adjust the refractive index distribution, arrange the wrapped space metasurface unit model according to the increasing refractive index, form the scattering effect of water surface waves, observe the change of water surface wave amplitude in the scattering area, confirm that the amplitude of the shadow area is reduced to the design target, and measure the minimum amplitude position of the far field water surface wave amplitude;

[0040] S33, adjust the zigzag channel and straight channel combination design, optimize the wave energy absorption ratio, and set the length of the rigid plate, analyze the change of far field water surface wave amplitude, and verify the influence of geometric parameters on transmission efficiency;

[0041] S34, overall performance evaluation is performed on the wrapped space metasurface unit model array, and the focusing and scattering effects in the target area are confirmed.

[0042] According to another aspect of the present application, a seawall protection structure design system based on wrapped space metasurface technology is also provided, which comprises:

[0043] A parameter design and adaptation module is used to select an adapted wrapped space metasurface unit model according to the frequency parameters and wave height parameters of the sea waves;

[0044] A model design and optimization module is used to design and optimize the wrapped space metasurface unit model based on a preset refractive index distribution;

[0045] A structure arrangement and debugging module is used to arrange and install the designed wrapped space metasurface unit model array outside the seawall and perform debugging;

[0046] A real-time monitoring and adjustment module is used to adjust the placement and refractive index of the wrapped space metasurface unit model by real-time monitoring of the sea conditions to cope with different sea wave conditions.

[0047] Further, the design and optimization of the wrapped space metasurface unit model based on the preset refractive index distribution comprises:

[0048] Based on the requirement of the coiled space metasurface unit model, zigzag channels and straight channels are designed, and geometric parameters are preset to construct an initial coiled space metasurface unit model design framework;

[0049] Based on the functional requirement of the refractive index distribution on the coiled space metasurface unit model, the performance of the coiled space metasurface unit model is optimized by adjusting the geometric parameters.

[0050] The beneficial effects of the present application are:

[0051] 1、The coiled space metasurface structure can concentrate wave energy in the focal region, reducing the impact force on other areas of the seawall by more than 50%, reducing direct impact on the structure, reducing damage risk, and extending the service life of the seawall by more than 30%. The repair needs of traditional protective dikes are reduced, maintenance costs are saved, the use of traditional hard materials is reduced, the impact on marine ecology is greatly reduced, and dynamic response protection capability can be provided in extreme sea conditions by adjusting the refractive index distribution and unit arrangement. Thus, by modulating the energy distribution of the water surface wave, focusing, scattering or absorbing the wave is achieved, effectively reducing the direct impact of the wave on the seawall, thereby enhancing the protection effect and reducing long-term maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0053] Figure 1 is a flowchart of a seawall protection structure design method based on coiled space metasurface technology according to an embodiment of the present application;

[0054] Figure 2 is a principle block diagram of a seawall protection structure design system based on coiled space metasurface technology according to an embodiment of the present application;

[0055] Figure 3 is a schematic diagram of a coiled space unit according to an embodiment of the present application;

[0056] Figure 4 is a top view of a coiled space unit according to an embodiment of the present application;

[0057] Figure 5 is a schematic diagram of a metasurface array composed of gradient refractive index coiled space units according to an embodiment of the present application;

[0058] Figure 6 is a schematic diagram of the relative effective refractive index and energy transmission of a winding space unit according to an embodiment of the present application as a function of the length of the rigid plate;

[0059] Figure 7 is a schematic diagram of the refractive index distribution of a winding unit along the y-axis direction according to an embodiment of the present application;

[0060] Figure 8 is a schematic diagram of the channel length reduction distribution of a winding unit along the y-axis direction according to an embodiment of the present application;

[0061] Figure 9 is a schematic diagram of the channel length increase distribution of a winding unit along the y-axis direction according to an embodiment of the present application;

[0062] Figure 10 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application;

[0063] Figure 11 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application;

[0064] Figure 12 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application;

[0065] Figure 13 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application;

[0066] Figure 14 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application;

[0067] Figure 15 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application;

[0068] Figure 16 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application;

[0069] Figure 17 is a comparison chart of experimental data of wave modulation effect according to an embodiment of the present application.

[0070] In the figure:

[0071] 1, parameter design and adaptation module; 2, model design and optimization module; 3, structure arrangement and debugging module; 4, real-time monitoring and adjustment module. DETAILED DESCRIPTION

[0072] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0073] According to embodiments of the present invention, a design method and system for seawall protection structures based on wound spatial metasurface technology are provided.

[0074] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 As shown, the seawall protection structure design method based on wound spatial metasurface technology according to an embodiment of the present invention includes the following steps:

[0075] S1. Select the appropriate rolled-up space metasurface unit model based on the frequency and wave height parameters of the ocean waves.

[0076] S2. Design and optimize the rolled-up spatial metasurface unit model based on the preset refractive index distribution;

[0077] S3. Arrange and install the designed and optimized spiral space metasurface unit model array on the outside of the seawall, and perform debugging;

[0078] It should be explained that modular assembly: the units (i.e., the rolled-up space metasurface unit models) can be manufactured and installed modularly, flexibly adjusted according to sea conditions, and convenient for maintenance and replacement. Due to the symmetry of the metasurface, such as Figure 5 As shown, half of the array of coiled spatial metasurface unit cells is plotted. Here, the units (i.e., the coiled spatial metasurface unit cell model) are arranged from the center to the edge of the metasurface, and the refractive index is distributed according to design requirements. The actual total length of the metasurface is 2. L =2.45 meters.

[0079] S4. By monitoring sea conditions in real time, adjust the placement and refractive index of the rolled-up space metasurface unit model to cope with different wave conditions.

[0080] It should be explained that the seawall protection structure is a metasurface composed of multiple wound spatial units. These units are arranged on the outer side of the seawall or embedded in the seabed according to the design concept of gradient effective refractive index (GRIN) metasurfaces. This metasurface consists of the following parts:

[0081] zigzag channels (e.g.) Figures 3-4As shown): Composed of coiled spatial units, the wave propagation distance is increased through a tortuous path, thereby generating phase delay and forming a high refractive index region. In this study, it is first assumed that the frequency of the water surface wave is 1.435 Hz, the corresponding wavelength of the water surface wave is 0.757 meters, and the wave speed is approximately 1.09 meters per second. The height of the coiled spatial unit is approximately 14 times the width of the unit (0.05 meters); the coiled spatial unit is placed in the water, and the height of the unit is approximately 14 times the width of the unit (0.05 meters). h 1 is 2.5 meters, water depth h 0 is 2 meters; the width of the unit a It is 0.05 meters long. b It is 0.10 meters; the thickness of the rigid plate is w Channel width d The expression for (i.e., the zigzag channel width) is: d =( a -8 w ) / n ,in n This represents the number of winding channels (i.e., the number of zigzag channels). The length of the rigid plate is... l .

[0082] Preferably, the design and optimization of the wound spatial metasurface unit model based on a preset refractive index distribution includes the following steps:

[0083] S21. Based on the requirements of the coiled spatial metasurface unit model, design zigzag channels and straight channels, preset geometric parameters, and construct the initial design framework of the coiled spatial metasurface unit model.

[0084] It should be explained that the straight channel is a straight channel without coiled spatial units, set in parallel with the zigzag channel, providing an impedance matching path to reduce energy loss and optimize wave transmission efficiency.

[0085] S22. Based on the functional requirements of the refractive index distribution for the rolled-up spatial metasurface unit model, the performance of the rolled-up spatial metasurface unit model is optimized by adjusting the geometric parameters.

[0086] Preferably, based on the target requirements, zigzag channels and straight channels are designed, and geometric parameters are preset. The initial design framework for the coiled spatial metasurface unit model includes the following steps:

[0087] S211. Design the geometry of the zigzag channel to extend the wave propagation distance through a tortuous path, generate phase delay, and form a high refractive index region;

[0088] S212. Parallel linear channels are set up to provide an impedance matching path for the zigzag channel, ensuring the overall performance of the coiled space metasurface unit model structure and optimizing wave transmission efficiency.

[0089] S213, based on the frequency, wavelength and wave speed of the water surface wave, and according to the proportional relationship between the wave and the geometric parameters of the zigzag channel, the initial parameters of the coiled space metasurface unit model structure are set;

[0090] S214, through the channel width formula, the relationship between the thickness of the rigid plate and the number of coiled channels is combined to complete the parameter calculation and structure design of the coiled space metasurface unit model.

[0091] Preferably, based on the functional requirements of the coiled space metasurface unit model on the refractive index distribution, the performance of the coiled space metasurface unit model is optimized by adjusting the geometric parameters, including the following steps:

[0092] S221, based on the effective medium theory, by adjusting the length and width of the zigzag channel, the relative refractive index distribution of the coiled space metasurface unit model is controlled, and the change rate of the refractive index is determined;

[0093] S222, based on the analysis of the relationship between the relative effective refractive index and the energy transmission efficiency of the zigzag channel length change, the optimization parameter range is determined;

[0094] S223, according to the optimization analysis result, the geometric parameters of the zigzag channel are adjusted to improve the wave modulation efficiency and reduce the phase loss;

[0095] S224, draw the geometric parameter and refractive index distribution relationship diagram, verify whether the performance of the coiled space metasurface unit model meets the design requirements, if it meets, design, if it does not meet, adjust and improve.

[0096] It needs to be explained that the design of each coiled space unit (i.e. zigzag channel) is based on the effective medium theory, by adjusting the geometric parameters (such as channel length, width and coiling degree) to control the relative effective refractive index n r and impedance matching degree of the unit. The specific parameters of the unit are as follows:

[0097] zigzag channel length ( l ): determines the size of the relative effective refractive index, the longer the length, the more obvious the phase delay when the wave passes, as shown in Figure 6 , Figure 6 shows the relative effective refractive index n r and energy transmission of the coiled space unit changes with l , wherein the solid line represents the relationship between the relative effective refractive index n r of the unit and the length of the rigid plate l , and the dashed line represents the energy (i.e. transmission energy) transmission changes with lThe changing circumstances. To better illustrate the parameters. l The effect of is illustrated by dashed lines, indicating one possible value, namely when . l When set to 4.58 cm, n r The value is 3.1, corresponding to an energy (i.e., transmitted energy) transfer rate of 90%.

[0098] It needs to be explained that the refractive index distribution: The relative refractive index distribution followed by the arrangement of the coiled spatial units, designed according to functional requirements, can create a lens-like function to achieve wave focusing or scattering effects. In this invention, to achieve focused water surface waves, the units are rearranged from the center to the edge in order of decreasing refractive index, employing a hyperbolic secant distribution of the unit refractive index distribution, as shown below. Figure 7 As shown, the unit refractive index n ( y )= n 0sech ( αy ),in n 0 represents the maximum refractive index at the center position, which is set in this invention. n 0 = 3.1; y This is the distance between the element and the center of the array; setting the refractive index of the outermost element. n L =1; then the constant controlling the refractive index gradient is... α =cosh -1 ( n 0 / n L ) / L =1.5; Calculations show that to achieve the following... Figure 7 The refractive index distribution shown indicates the channel length in the wound unit of the metasurface structure. l along y The values ​​of the axis are as follows Figure 8 As shown, a metasurface for focusing water surface waves is thus designed. If the cells are rearranged from the center to the edge in order of increasing refractive index, the scattering effect of the metasurface can be obtained, with the winding cell channel length along... y Axial directions are distributed as follows Figure 9 As shown in the image.

[0099] Preferably, the channel width formula is:

[0100] d =( a -8 w ) / N ;

[0101] In the formula, d Indicates the width of the zigzag channel; w The thickness of the rigid plate is indicated. Nrepresents the number of zigzag channels; a represents the total width of the wrapped spatial metasurface cell model.

[0102] Preferably, the refractive index distribution formula is:

[0103] n y n 0sech αy

[0104] In the formula, n 0represents the maximum refractive index of the metasurface cell at the center position of the model array; y represents the distance of the wrapped spatial metasurface cell model from the center of the array; sech represents the hyperbolic sine function; α represents a constant controlling the refractive index gradient.

[0105] Preferably, the formula for determining the rate of change of the refractive index is:

[0106] α =cosh -1 n n L L ;

[0107] In the formula, α represents a constant controlling the refractive index gradient; n L represents the refractive index of the most edge wrapped spatial metasurface cell model; n 0represents the maximum refractive index of the metasurface cell at the center position of the model array; L represents the distance from the center of the model array to the edge; cosh represents the hyperbolic cosine function.

[0108] Preferably, the wrapped spatial metasurface cell model array arrangement completed by design and optimization is installed on the outside of the seawall, and debugging includes the following steps:

[0109] S31, arrange the wrapped spatial metasurface cell model with high refractive index in the target area to form the focusing effect of water surface waves, measure the characteristics of the focusing area, adjust the refractive index distribution in a spherical form, and observe the change of focal length;

[0110] S32, adjust the refractive index distribution, arrange the wrapped spatial metasurface cell model according to the increasing refractive index, form the scattering effect of water surface waves, observe the change of water surface wave amplitude in the scattering area, confirm that the amplitude of the shadow area is reduced to the design target, and measure the minimum amplitude position of the far-field water surface wave amplitude;

[0111] ​​​​​​S33, adjust the zigzag channel and straight channel combination design, optimize the wave energy absorption ratio, and set the rigid plate length, analyze the change of the far-field water surface wave amplitude, and verify the influence of the geometric parameters on the transmission efficiency;

[0112] S34, overall performance evaluation of the wrapped space metasurface unit model array, confirmation of the focusing and scattering effect in the target area.

[0113] It needs to be explained that the wave focusing: arranging high refractive index units in front of the seawall, so that the sea wave energy is gathered in the target area, and the impact on other parts of the seawall is weakened. As shown in Figure 10 , the distribution of the water surface wave amplitude forms a sharp focal point with high amplitude. The size of the focal point can be adjusted by the unit structure parameters. The water surface wave amplitude at the focal point is amplified by 1.65 times compared with the case without structure, indicating that the energy density is greatly increased, which shows that the metasurface array can be used to focus the water surface wave energy in the specified area. In order to more accurately describe the focusing characteristics, as shown in Figures 10-11 , the solid line shows the normalized amplitude distribution of the water surface wave along the x axis and the y axis when passing through the focusing metasurface. The dotted line shows the amplitude distribution of the Helmholtz resonator array for comparison. As shown in Figure 10 , the focal length of the metasurface is about 2.65 meters. All the calculations of longer and thicker metasurfaces are repeated, and it is found that the focusing effect can be significantly improved. As shown in Figure 11 , the amplitude distribution of the water surface wave along the y axis direction when passing through the focusing point of the focusing metasurface. The width of the focusing area is about 1.1 meters. The influence of different parameters on the focusing effect is also studied. For example, the refractive index distribution is adjusted to be spherical, and the results show that the amplitude distribution of the water surface wave still shows a sharp focal point with high amplitude, and the corresponding focal length increases to 3.65 meters, which is greater than the original design of 2.65 meters.

[0114] Energy scattering: by adjusting the unit arrangement, rearranging the units from the center to the edge in the order of increasing refractive index, and arranging the length of the wrapped unit channel along the y axis direction as shown in Figure 9 . The wave energy is dispersed to a wider area to avoid concentrated impact damage to the dam. As shown in Figures 12-13 , the scattering effect of the metasurface is shown. It can be observed that the water surface wave is scattered to both sides of the edge, and the wave amplitude along the x axis direction is significantly reduced. In the shadow area behind the metasurface, the amplitude of the water surface wave is reduced to 1 / 2.87 without structure. As shown in Figure 12 , it can be found that the minimum amplitude of the water surface wave in the far field appears x=1.8 meters. Due to the complex refraction of transmitted waves, the amplitude in the near field may even exceed 1. For example Figure 13 As shown, except y Beyond the minimum amplitude at =0 meters, in the far field y The minimum amplitude also exists at ±1.75 meters. Compared to the Helmholtz resonator array, the main energy of the water surface wave is along the incident direction ( x The axis is scattered to both sides, therefore in the far field x The amplitude of the wave is lower in the axial direction.

[0115] Energy absorption and impedance matching: The combination of zigzag and straight channel design allows the unit to absorb some wave energy while ensuring impedance matching and reducing energy loss.

[0116] like Figures 14-15 As shown, when l When the value is fixed at 3.5 cm, the minimum amplitude of the water surface wave in the far field appears to occur at... x =1.37 meters. Except for y Beyond the minimum amplitude at =0 meters, in the far field y The minimum amplitude point also exists at ±1.73 meters.

[0117] It should be explained that, as mentioned above, the parameters of the protective structure can be obtained through computer simulation calculations based on actual hydrological conditions (surface wave frequency) and the location and requirements of the protected object. Then, the parameters of the actual structure can be adjusted according to the calculation results to achieve the purpose of specific protection.

[0118] like Figures 16-17 As shown, considering different hydrological conditions, the calculations were performed when the frequency of the introduced surface wave was set to 2.185 Hz, corresponding to a surface wave wavelength of 0.5, which is approximately 10 times the unit magnification (0.05 meters). Figures 10-11 Modulation of water surface wave propagation by the same structure. The minimum amplitude of the water surface wave in the far field appears... x =2.32 meters.

[0119] According to another embodiment of the invention, such as Figure 2 As shown, a seawall protection structure design system based on wound spatial metasurface technology is also provided. This seawall protection structure design system includes:

[0120] The parameter design and adaptation module 1 is used to select the appropriate rolled-up spatial metasurface unit model based on the frequency and wave height parameters of the ocean waves.

[0121] Model design and optimization module 2 is used to design and optimize the rolled-up spatial metasurface unit model based on the preset refractive index distribution;

[0122] A structure arrangement and debugging module 3 is configured to arrange and install the designed winding space metasurface unit model array outside the seawall and debug it;

[0123] A real-time monitoring and adjustment module 4 is configured to adjust the placement and refractive index of the winding space metasurface unit model to cope with different sea wave conditions by monitoring the sea conditions in real time.

[0124] Preferably, the design and optimization of the winding space metasurface unit model based on the preset refractive index distribution comprises:

[0125] Based on the requirements of the winding space metasurface unit model, zigzag channels and straight channels are designed, and geometric parameters are preset to construct an initial winding space metasurface unit model design framework;

[0126] Based on the functional requirements of the refractive index distribution of the winding space metasurface unit model, the performance of the winding space metasurface unit model is optimized by adjusting the geometric parameters.

[0127] In summary, by means of the above technical solutions of the present application, the wave energy can be concentrated in the focal area by the winding space metasurface structure, so that the impact force on other areas of the seawall is reduced by more than 50%, the direct impact on the structure is reduced, the damage risk is reduced, the service life of the seawall is expected to be extended by more than 30%, the repair demand of the traditional protective dike is reduced, the maintenance cost is saved, the use of traditional hard materials is reduced, the impact on the marine ecology is greatly reduced, and the dynamic response protection capability can be provided in extreme sea conditions by adjusting the refractive index distribution and the unit arrangement, so as to modulate the energy distribution of the water surface wave, realize the focusing, scattering or absorption of the wave, effectively reduce the direct impact of the sea wave on the seawall, and further enhance the protection effect and reduce the long-term maintenance cost.

[0128] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A seawall protection structure design method based on a coiled space metasurface technology, characterized in that, The seawall protection structure design method comprises the following steps: S1, according to the frequency parameters and wave height parameters of the sea wave, selecting the appropriate winding space metasurface unit model; S2, based on the preset refractive index distribution, the design and optimization of the winding space metasurface unit model; S3, the winding space metasurface unit model array arranged and installed on the outside of the seawall is debugged; S4, by monitoring the sea conditions in real time, adjusting the placement and refractive index of the winding space metasurface unit model to cope with different sea wave conditions.

2. The seawall defense structure design method based on the wrapped-space metasurface technology according to claim 1, characterized in that, The design and optimization of the winding space metasurface unit model based on the preset refractive index distribution comprises the following steps: S21, based on the winding space metasurface unit model requirement, designing zigzag channel and straight channel, and presetting geometric parameters to construct the initial winding space metasurface unit model design framework; S22, based on the function requirement of the winding space metasurface unit model, optimizing the performance of the winding space metasurface unit model by adjusting the geometric parameters.

3. The seawall defense structure design method based on a wrapped-space metasurface technology according to claim 2, characterized in that, Based on the target requirement, designing zigzag channel and straight channel, and presetting geometric parameters to construct the initial winding space metasurface unit model design framework comprises the following steps: S211, designing the geometric structure of zigzag channel, prolonging the wave propagation distance through the zigzag path to produce phase delay and form high refractive index area; S212, parallelly arranging straight channel to provide impedance matching path for zigzag channel, ensuring the overall performance of the winding space metasurface unit model structure and optimizing the transmission efficiency of wave; S213, based on the frequency, wavelength and wave speed of water surface wave, and according to the proportional relationship between wave and zigzag channel geometric parameters, setting the initial parameters for the winding space metasurface unit model structure; S214, through the channel width formula, combining the relationship between the thickness of rigid plate and the number of winding channels, completing the parameter calculation and structure design of winding space metasurface unit model.

4. The seawall defense structure design method based on a wrapped-space metasurface technology according to claim 3, characterized in that, The function requirement of the winding space metasurface unit model based on the refractive index distribution, optimizing the performance of the winding space metasurface unit model by adjusting the geometric parameters comprises the following steps: S221, based on effective medium theory, adjusting the length and width of zigzag channel to control the relative refractive index distribution of winding space metasurface unit model, and determining the change rate of refractive index; S222, based on the analysis of the relationship between relative effective refractive index and energy transmission efficiency zigzag channel length change, determining the optimization parameter range; S223, according to the optimization analysis result, adjusting the geometric parameters of zigzag channel to improve the wave modulation efficiency and reduce the phase loss; S224, drawing the relationship diagram of geometric parameters and refractive index distribution to verify whether the performance of winding space metasurface unit model meets the design requirement, if yes, then designing, if not, then adjusting and improving.

5. The seawall defense structure design method based on a wrapped-space metasurface technology according to claim 4, characterized in that, The channel width formula is: d =（ a -8 w ） / N ； In the formula, d denotes the zigzag channel width; w represents the thickness of the rigid plate; N represents the number of zigzag channels; a represents the total width of the coiled spatial metasurface unit model.

6. The seawall defense structure design method based on a wrapped-space metasurface technology according to claim 5, characterized in that, The refractive index distribution formula is: n (0.5 y )= 0.5 n 0sech(0.5 αy ); wherein n 0 represents the maximum refractive index of the metasurface unit at the center position of the model array; y represents the distance of the wrapped spatial metasurface unit model from the center of the array; sech represents the hyperbolic sine function; α represents a constant that controls the refractive index gradient.

7. The method of claim 6, wherein the method is characterized by: The formula for determining the change rate of refractive index is: α = cosh -1 ( n 0 / n L ) / L ; wherein α represents a constant that controls the refractive index gradient; n L represents the refractive index of the metasurface unit at the edge of the model; n 0 represents the maximum refractive index of the metasurface unit at the center of the model array; L represents the distance from the center of the model array to the edge; and cosh represents the hyperbolic cosine function.

8. The design method of seawall protection structure based on wrapped-space metasurface technology according to claim 1, characterized in that, The winding space metasurface unit model array arranged and installed on the outside of the seawall is debugged, comprising the following steps: S31, arrange the high refractive index coiled space metasurface unit model in the target area to form the focusing effect of water surface waves, measure the characteristics of the focusing area, and adjust the refractive index distribution in a spherical form to observe the change of focal length; S32, adjust the refractive index distribution, arrange the coiled space metasurface unit model according to the increasing refractive index to form the scattering effect of water surface waves, observe the change of water surface wave amplitude in the scattering area, confirm that the amplitude of the shadow area is reduced to the design target, and measure the minimum amplitude position of the far-field water surface wave amplitude; S33, adjust the zigzag channel and straight channel combination design, optimize the wave energy absorption ratio, set the length of the rigid plate, analyze the change of the far-field water surface wave amplitude, and verify the influence of geometric parameters on transmission efficiency; S34, overall performance evaluation of the coiled space metasurface unit model array, confirm the focusing and scattering effect in the target area.

9. A seawall protection structure design system based on a coiled spatial metasurface technology, for implementing the seawall protection structure design method based on the coiled spatial metasurface technology according to any one of claims 1-8, characterized in that, The seawall protection structure design system comprises: A parameter design and adaptation module for selecting an adapted coiled space metasurface unit model according to the frequency and wave height parameters of the sea waves; A model design and optimization module for designing and optimizing the coiled space metasurface unit model based on a preset refractive index distribution; A structure arrangement and debugging module for arranging and installing the designed coiled space metasurface unit model array outside the seawall and debugging; A real-time monitoring and adjustment module for adjusting the placement and refractive index of the coiled space metasurface unit model to cope with different sea wave conditions by monitoring the sea conditions in real time.

10. The seawall defense structure design system based on a wrapped-space metasurface technology according to claim 9, characterized in that, The design and optimization of the coiled space metasurface unit model based on the preset refractive index distribution comprises: Designing zigzag channels and straight channels based on the requirements of the coiled space metasurface unit model, presetting geometric parameters, and constructing an initial coiled space metasurface unit model design framework; Based on the functional requirements of the refractive index distribution on the coiled space metasurface unit model, the performance of the coiled space metasurface unit model is optimized by adjusting the geometric parameters.

Images