Seawall protection structure design method and system based on winding space metasurface technology

Abstract

The invention discloses a seawall protection structure design method and system based on a winding space metasurface technology, and relates to the technical field of seawall protection engineering.The seawall protection structure design method comprises the following steps that an adaptive winding space metasurface unit model is selected according to frequency parameters and wave height parameters of sea waves; designing and optimizing a winding space metasurface unit model based on preset refractive index distribution; arranging and mounting the designed winding space metasurface unit model array on the outer side of a seawall, and debugging; by monitoring the sea condition in real time, the placement and the refractive index of the winding space metasurface unit model are adjusted to cope with different sea wave conditions. By modulating energy distribution of water surface waves, focusing, scattering or absorbing of the waves is achieved, direct impact of the waves on the seawall is effectively reduced, the protection effect is enhanced, and the long-term maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of seawall protection engineering, and in particular to a seawall protection structure design method and system based on winding space metasurface technology. Background Art

[0002] Current seawall protection structures usually use traditional physical barriers, such as using concrete, stones and steel bars to build breakwaters to resist the impact of waves. However, these traditional technologies face the following challenges in practical applications: High maintenance costs: Traditional seawalls are subject to erosion by wind and waves and are prone to structural damage, especially in extreme weather conditions, which results in extremely high maintenance and repair costs.

[0003] Insufficient impact resistance: Existing seawalls are difficult to effectively buffer and disperse the impact of waves, and are easily destroyed by waves, especially under extreme conditions such as typhoons and storm surges.

[0004] Environmental impact: Large-scale construction of reinforced concrete dams will destroy coastal ecosystems and affect marine habitats, leading to ecological imbalance.

[0005] Existing technologies attempt to introduce new materials and flexible structures to improve the protection effect, such as using wave-breaking blocks and flexible wave-breaking walls, but these measures still have the problem of insufficient protection capabilities when facing 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 the seawall.

[0006] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0007] In response to the problems in the related technology, the present invention proposes a seawall protection structure design method and system based on winding space metasurface technology to overcome the above-mentioned technical problems existing in the existing related technology.

[0008] To this end, the specific technical solution adopted by the present invention is as follows: According to one aspect of the present invention, a method for designing a seawall protection structure based on a winding space metasurface technology is provided, and the method for designing a seawall protection structure comprises the following steps: S1. Select an appropriate winding space metasurface unit model according to the frequency parameters and wave height parameters of the waves; S2. Design and optimize the winding space metasurface unit model based on the preset refractive index distribution; S3, arranging and installing the designed and optimized coiled space metasurface unit model array outside the seawall and debugging it; S4. By real-time monitoring of sea conditions, the placement and refractive index of the winding space metasurface unit model are adjusted to cope with different wave conditions.

[0009] Furthermore, the design and optimization of the winding space metasurface unit model based on the preset refractive index distribution includes the following steps: S21. Based on the requirements of the winding space hypersurface unit model, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to construct the initial winding space hypersurface unit model design framework; S22. Based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, the performance of the winding space metasurface unit model is optimized by adjusting the geometric parameters.

[0010] Furthermore, based on the target requirements, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to construct the initial winding space metasurface unit model design framework, which includes the following steps: S211. Design the geometric structure of the zigzag channel to extend the wave propagation distance through the tortuous path, produce phase delay, and form a high refractive index area; S212, setting straight channels in parallel to provide impedance matching paths for zigzag channels, ensuring the overall performance of the winding space metasurface unit model structure, and optimizing the transmission efficiency of waves; S213, based on the frequency, wavelength and wave speed of the water surface wave, and according to the proportional relationship between the geometric parameters of the wave and the zigzag channel, setting initial parameters for the winding space metasurface unit model structure; S214. Through the channel width formula, combined with the relationship between the thickness of the rigid plate and the number of winding channels, the parameter calculation and structural design of the winding space metasurface unit model are completed.

[0011] Furthermore, based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, optimizing the performance of the winding space metasurface unit model by adjusting the geometric parameters includes the following steps: S221. Based on the effective medium theory, the relative refractive index distribution of the winding space metasurface unit model is controlled by adjusting the length and width of the zigzag channel, and the rate of change of the refractive index is determined; S222, determining an optimization parameter range based on analyzing the relationship between the relative effective refractive index and the change in the energy transmission efficiency zigzag channel length; S223. According to the optimization analysis results, the geometric parameters of the zigzag channel are adjusted to improve the wave modulation efficiency and reduce the phase loss; S224. Draw a relationship diagram between geometric parameters and refractive index distribution to verify whether the performance of the winding space metasurface unit model meets the design requirements. If so, design is carried out; if not, adjustments and improvements are made.

[0012] Furthermore, the channel width formula is: d =( a -8 w ) / N ; In the formula, d Indicates the zigzag channel width; w The thickness of the rigid plate represented by; N Indicates the number of zigzag channels; a Represents the total width of the warped space hypersurface unit model.

[0013] Furthermore, the refractive index distribution formula is: n ( y )= n 0sech( αy ); In the formula, n 0 represents the maximum refractive index of the metasurface unit at the center of the model array; y represents the distance between the winding space metasurface unit model and the array center; sech represents the hyperbolic sine function; α Represents the constant that controls the refractive index gradient.

[0014] Furthermore, the formula for determining the rate of change of the refractive index is: α =cosh -1 ( n 0 / n L ) / L ; In the formula, α represents the constant controlling the refractive index gradient; n L represents the refractive index of the edge-most coiled space metasurface unit 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 to the edge of the model array; cosh represents the hyperbolic cosine function.

[0015] Furthermore, the designed and optimized coiled space metasurface unit model array is installed outside the seawall and debugged, including the following steps: S31, arranging a high-refractive-index winding space metasurface unit model in a target area to form a focusing effect of a water surface wave, measuring the characteristics of the focusing area, and adjusting the refractive index distribution in a spherical form to observe changes in focal length; S32, adjusting the refractive index distribution, arranging the winding space metasurface unit model in increasing order according to the refractive index, forming a scattering effect of the water surface wave, observing the change in the amplitude of the water surface wave in the scattering area, confirming that the amplitude in the shadow area is reduced to the design target, and determining the minimum amplitude position of the far-field water surface wave amplitude; S33, adjust the design of the combination of zigzag channel and straight channel, optimize the wave energy absorption ratio, 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; S34. Conduct an overall performance evaluation of the coiled space metasurface unit model array to confirm its focusing and scattering effects in the target area.

[0016] According to another aspect of the present invention, a seawall protection structure design system based on the winding space metasurface technology is also provided, and the seawall protection structure design system includes: The parameter design and adaptation module is used to select an adaptive winding space metasurface unit model according to the frequency parameters and wave height parameters of the waves; Model design and optimization module, used to design and optimize the unit model of the winding space metasurface based on the preset refractive index distribution; The structural layout and debugging module is used to arrange and install the designed coiled space metasurface unit model array outside the seawall and conduct debugging; The real-time monitoring and adjustment module is used to adjust the placement and refractive index of the winding space metasurface unit model to cope with different wave conditions by real-time monitoring of the sea conditions.

[0017] Furthermore, the design and optimization of the winding space metasurface unit model based on the preset refractive index distribution includes: Based on the requirements of the winding space hypersurface unit model, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to build the initial winding space hypersurface unit model design framework; Based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, the performance of the winding space metasurface unit model is optimized by adjusting the geometric parameters.

[0018] The beneficial effects of the present invention are: 1. The present invention can concentrate wave energy in the focal area through 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 risk of damage is reduced, and the service life of the seawall is expected to be extended by more than 30%. It also reduces the need for repair of traditional protective dikes, saves maintenance costs, and reduces the use of traditional hard materials. The impact on the marine ecology is greatly reduced. By adjusting the refractive index distribution and unit arrangement, dynamic response protection capabilities can be provided under extreme sea conditions, thereby modulating the energy distribution of surface waves to achieve focusing, scattering or absorption of waves, effectively reducing the direct impact of waves on the seawall, thereby enhancing the protection effect and reducing long-term maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a flow chart of a method for designing a seawall protection structure based on a winding space metasurface technology according to an embodiment of the present invention; Figure 2 is a principle block diagram of a seawall protection structure design system based on a winding space metasurface technology according to an embodiment of the present invention; Figure 3 is a schematic diagram of a winding space unit according to an embodiment of the present invention; Figure 4 is a top view of a winding space unit according to an embodiment of the present invention; Figure 5 is a schematic diagram of a metasurface array composed of gradient refractive index winding space units according to an embodiment of the present invention; 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 invention as a function of the length of a rigid plate; Figure 7 is a schematic diagram of the refractive index distribution of the winding unit along the y-axis direction according to an embodiment of the present invention; Figure 8 is a schematic diagram of the distribution of the winding unit channel length decreasing along the y-axis direction according to an embodiment of the present invention; Fig. 9 is a schematic diagram showing the distribution of the winding unit channel length along the y-axis direction according to an embodiment of the present invention; Fig.10 This is one of the comparison diagrams of experimental data of wave modulation effect according to an embodiment of the present invention; Fig.11 This is the second comparison diagram of the wave modulation effect experimental data according to the embodiment of the present invention; Fig.12 This is the third comparison diagram of the experimental data of the wave modulation effect according to the embodiment of the present invention; Fig.13 This is the fourth comparison diagram of the experimental data of the wave modulation effect according to the embodiment of the present invention; Fig.14 This is the fifth comparison chart of experimental data of wave modulation effect according to an embodiment of the present invention; Fig.15 This is the sixth comparison diagram of wave modulation effect experimental data according to an embodiment of the present invention; Fig.16 This is the seventh comparison diagram of experimental data of wave modulation effect according to an embodiment of the present invention; Fig.17 This is the eighth comparison chart of experimental data of wave modulation effect according to an embodiment of the present invention.

[0021] In the figure: 1. Parameter design and adaptation module; 2. Model design and optimization module; 3. Structural layout and debugging module; 4. Real-time monitoring and adjustment module. DETAILED DESCRIPTION

[0022] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and 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 contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] According to an embodiment of the present invention, a method and system for designing a seawall protection structure based on winding space metasurface technology are provided.

[0024] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1 As shown, according to the seawall protection structure design method based on the winding space metasurface technology according to an embodiment of the present invention, the seawall protection structure design method includes the following steps: S1. Select an appropriate winding space metasurface unit model according to the frequency parameters and wave height parameters of the waves; S2. Design and optimize the winding space metasurface unit model based on the preset refractive index distribution; S3, arranging and installing the designed and optimized coiled space metasurface unit model array outside the seawall and debugging it; It should be explained that modular assembly: the unit (i.e. the coiled space metasurface unit model) can be manufactured and installed in a modular manner, and can be flexibly adjusted according to sea conditions, making maintenance and replacement convenient. Due to the symmetry of the metasurface, Figure 5 As shown in Figure 1, half of the array of the unit model of the winding space metasurface is drawn. Here, the units (i.e., the unit model of the winding space metasurface) are arranged from the center to the edge of the metasurface, and the refractive index is distributed according to the design requirements. The actual total length of the metasurface is 2 L =2.45 meters.

[0025] S4. By real-time monitoring of sea conditions, the placement and refractive index of the winding space metasurface unit model are adjusted to cope with different wave conditions.

[0026] It should be explained that the seawall protection structure is a metasurface composed of multiple coiled space units, which are arranged outside the seawall or embedded in the seabed according to the design concept of the gradient effective refractive index (GRIN) metasurface. The metasurface consists of the following parts: Zigzag channel (such as Figure 3-Figure 4 As shown in the figure): It is composed of a winding space unit, which increases the wave propagation distance through a tortuous path, thereby generating a phase delay and forming a high refractive index area. In this study, it is first assumed that the frequency of the water surface wave is 1.435Hz, the corresponding water surface wave wavelength is 0.757 meters, and the speed of the water surface wave is about 1.09 meters per second. It is about 14 times the unit width (0.05 meters); the winding space unit is placed in the water, and the height of the unit is h 1 is 2.5 meters, water depth h 0 is 2 meters; the width of the unit a 0.05 m in length b is 0.10 m; the thickness of the rigid plate is w , channel width d The expression for (i.e., zigzag channel width) is d =( a -8 w ) / n ,in n represents the number of winding channels (i.e., the number of zigzag channels). The length of the rigid plate is l .

[0027] Preferably, the design and optimization of the winding space metasurface unit model based on the preset refractive index distribution includes the following steps: S21. Based on the requirements of the winding space hypersurface unit model, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to construct the initial winding space hypersurface unit model design framework; It needs to be explained that the straight channel: a straight channel without winding space units, is set in parallel with the zigzag channel, providing an impedance matching path to reduce energy loss and optimize the transmission efficiency of waves.

[0028] S22. Based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, the performance of the winding space metasurface unit model is optimized by adjusting the geometric parameters.

[0029] Preferably, based on the target requirements, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to construct the initial winding space metasurface unit model design framework, including the following steps: S211. Design the geometric structure of the zigzag channel to extend the wave propagation distance through the tortuous path, produce phase delay, and form a high refractive index area; S212, setting straight channels in parallel to provide impedance matching paths for zigzag channels, ensuring the overall performance of the winding space metasurface unit model structure, and optimizing the transmission efficiency of waves; S213, based on the frequency, wavelength and wave speed of the water surface wave, and according to the proportional relationship between the geometric parameters of the wave and the zigzag channel, setting initial parameters for the winding space metasurface unit model structure; S214. Through the channel width formula, combined with the relationship between the thickness of the rigid plate and the number of winding channels, the parameter calculation and structural design of the winding space metasurface unit model are completed.

[0030] Preferably, based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, optimizing the performance of the winding space metasurface unit model by adjusting the geometric parameters includes the following steps: S221. Based on the effective medium theory, the relative refractive index distribution of the winding space metasurface unit model is controlled by adjusting the length and width of the zigzag channel, and the rate of change of the refractive index is determined; S222, determining an optimization parameter range based on analyzing the relationship between the relative effective refractive index and the change in the energy transmission efficiency zigzag channel length; S223. According to the optimization analysis results, the geometric parameters of the zigzag channel are adjusted to improve the wave modulation efficiency and reduce the phase loss; S224. Draw a relationship diagram between geometric parameters and refractive index distribution to verify whether the performance of the winding space metasurface unit model meets the design requirements. If so, design is carried out; if not, adjustments and improvements are made.

[0031] It should be explained that the design of each winding spatial unit (i.e., zigzag channel) is based on the effective medium theory, which controls the relative effective refractive index of the unit by adjusting geometric parameters (such as channel length, width, and degree of winding).n r And the impedance matching degree. The specific parameters of the unit are as follows: Zigzag channel length ( l ): determines the relative effective refractive index. The longer the length, the more obvious the phase delay when the wave passes through. Figure 6 As shown, Figure 6 Shows the relative effective refractive index of the wrapped spatial unit n r and energy transmission l The solid line represents the relative effective refractive index of the unit cell. n r With the length of the rigid board l The dotted line indicates the energy (i.e., transmitted energy) transmitted with l To better illustrate the parameters l The dotted line shows one of the values, that is, when l When set to 4.58 cm, n r is 3.1, and the corresponding energy (i.e., transmitted energy) transmission rate is 90%.

[0032] It should be explained that the refractive index distribution is designed according to the functional requirements to follow the relative refractive index distribution of the winding space unit arrangement, which can form a lens-like function to achieve the focusing or scattering effect of the waves. In order to achieve the focusing of the water surface waves in the present invention, the units are rearranged from the center to the edge in the order of decreasing refractive index, and the refractive index distribution of the units with hyperbolic secant distribution is adopted as follows Figure 7 As shown, the unit refractive index n ( y )= n 0sech( αy ),in n 0 is the maximum refractive index at the center position. n 0=3.1; y is the distance between the unit and the center of the array; sets the refractive index of the outermost unit n L =1; then the constant controlling the refractive index gradient α =cosh -1 ( n 0 / n L ) / L =1.5; Through calculation, we know that to achieve Figure 7 The refractive index distribution shown in , then the channel length in the winding unit of the metasurface structure l along y The axis value is as follows Figure 8As shown in , a metasurface for focusing water surface waves is designed. If the units are rearranged from the center to the edge in the order of increasing refractive index, the scattering effect of the metasurface can be obtained. y The axial direction is distributed as follows Fig. 9 as shown in .

[0033] Preferably, the channel width formula is: d =( a -8 w ) / N ; In the formula, d Indicates the zigzag channel width; w The thickness of the rigid plate represented by; N Indicates the number of zigzag channels; a Represents the total width of the warped space hypersurface unit model.

[0034] Preferably, the refractive index distribution formula is: n ( y )= n 0sech( αy ); In the formula, n 0 represents the maximum refractive index of the metasurface unit at the center of the model array; y represents the distance between the winding space metasurface unit model and the array center; sech represents the hyperbolic sine function; α Represents the constant that controls the refractive index gradient.

[0035] Preferably, the formula for determining the rate of change of the refractive index is: α =cosh -1 ( n 0 / n L ) / L ; In the formula, α represents the constant controlling the refractive index gradient; n L represents the refractive index of the edge-most coiled space metasurface unit 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 to the edge of the model array; cosh represents the hyperbolic cosine function.

[0036] Preferably, the designed and optimized coiled space metasurface unit model array is arranged and installed outside the seawall, and debugging includes the following steps: S31, arranging a high-refractive-index winding space metasurface unit model in a target area to form a focusing effect of a water surface wave, measuring the characteristics of the focusing area, and adjusting the refractive index distribution in a spherical form to observe changes in focal length; S32, adjusting the refractive index distribution, arranging the winding space metasurface unit model in increasing order according to the refractive index, forming a scattering effect of the water surface wave, observing the change in the amplitude of the water surface wave in the scattering area, confirming that the amplitude in the shadow area is reduced to the design target, and determining the minimum amplitude position of the far-field water surface wave amplitude; S33, adjust the design of the combination of zigzag channel and straight channel, optimize the wave energy absorption ratio, 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; S34. Conduct an overall performance evaluation of the coiled space metasurface unit model array to confirm its focusing and scattering effects in the target area.

[0037] It needs to be explained that wave focusing: high refractive index units are arranged in front of the seawall to concentrate the wave energy in the target area and weaken the impact on other parts of the seawall. Fig.10 As shown, the distribution of the water surface wave amplitude forms a sharp focus with high amplitude. The size of the focus can be adjusted by the unit structure parameters. The water surface wave amplitude at the focus point is amplified by 1.65 times compared to the case without structure, indicating a significant increase in energy density, which shows that the metasurface array can be used to focus water surface wave energy in a specified area. In order to more accurately describe the focusing characteristics, as Figure 10-11 As shown in the figure, the solid line shows the water surface wave moving along the focusing metasurface. x Axis and y The normalized amplitude distribution of the axis. The dashed line shows the amplitude distribution of the Helmholtz resonator array for comparison. Fig.10 As shown in Figure 2, the focal length of the metasurface was measured to be approximately 2.65 meters. All calculations were repeated for longer and thicker metasurfaces and it was found that the focusing effect could be significantly improved. Fig.11 The water surface wave moves along the focusing point of the focusing metasurface. y The amplitude distribution in the axial direction. The width of the focusing area is about 1.1 meters. The effects of different parameters on the focusing effect were also studied. For example, the refractive index distribution was adjusted to a spherical form. The results showed that the amplitude distribution of the water surface wave still showed a sharp focus with high amplitude, and the corresponding focal length increased to 3.65 meters, which is larger than the 2.65 meters of the original design.

[0038] Energy scattering: By adjusting the unit arrangement, the units are rearranged from the center to the edge in the order of increasing refractive index, and the length of the winding unit channel is y The axial direction is distributed as follows Fig. 9As shown in . Disperse wave energy over a wider area to avoid concentrated impact and damage to the embankment. Figure 12-13 As shown in Figure 1, the scattering effect of the metasurface is shown. It can be observed that the water surface waves are scattered to the edges on both sides. x The wave amplitude in the axial direction is significantly reduced. In the shadow area behind the metasurface, the amplitude of the water surface wave drops to 1 / 2.87 of that without the structure. Fig.12 As shown in Figure 2, it can be found that the minimum amplitude of the water surface wave in the far field occurs at x = 1.8 m. Due to the complex refraction of the transmitted wave, the amplitude in the near field may even exceed 1. Fig.13 As shown, except y = 0 m, the minimum amplitude in the far field y = ±1.75 m. Compared with the Helmholtz resonator array, the main energy of the water surface wave is along the incident direction ( x axis) is scattered to both sides, so in the far field x The amplitude of the waves in the axial direction is lower.

[0039] Energy absorption and impedance matching: The combined design of zigzag and straight channel enables the unit to partially absorb wave energy while ensuring impedance matching and reducing energy loss.

[0040] like Figure 14-15 As shown, when l When the setting is fixed at 3.5 cm, the minimum amplitude of the water surface wave in the far field occurs at x =1.37 meters. y = 0 m, the minimum amplitude in the far field y = ±1.73 meters also has the minimum amplitude point.

[0041] It should be explained that, as mentioned above, the parameters of the protection structure can be obtained through computer simulation calculation and inversion based on the actual hydrological conditions (surface wave frequency) and the location and needs of the protection object, and then the parameters of the actual structure can be adjusted according to the calculation results to achieve the purpose of specific protection.

[0042] like Figure 16-Figure 17 As shown in Figure 2, considering different hydrological conditions, it is calculated that when the frequency of the introduced water surface wave is set to 2.185 Hz, the corresponding water surface wave wavelength is 0.5, which is about 10 times the unit magnification (0.05 m). Figure 10-11 The same structure modulates the propagation of water surface waves. The minimum amplitude of the water surface wave in the far field occurs at x =2.32 meters.

[0043] According to another embodiment of the present invention, Figure 2As shown, a seawall protection structure design system based on the winding space metasurface technology is also provided, and the seawall protection structure design system includes: Parameter design and adaptation module 1, used to select an adaptive winding space metasurface unit model according to the frequency parameters and wave height parameters of the waves; Model design and optimization module 2, used for designing and optimizing the winding space metasurface unit model based on a preset refractive index distribution; The structural arrangement and debugging module 3 is used to arrange and install the designed winding space metasurface unit model array outside the seawall and perform debugging; The real-time monitoring and adjustment module 4 is used to adjust the placement and refractive index of the winding space metasurface unit model to cope with different wave conditions by real-time monitoring of the sea conditions.

[0044] Preferably, the design and optimization of the winding space metasurface unit model based on the preset refractive index distribution includes: Based on the requirements of the winding space hypersurface unit model, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to build the initial winding space hypersurface unit model design framework; Based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, the performance of the winding space metasurface unit model is optimized by adjusting the geometric parameters.

[0045] To sum up, with the help of the above-mentioned technical scheme of the present invention, the present invention can concentrate wave energy in the focal area through the winding spatial 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, and the risk of damage is reduced. The service life of the seawall is expected to be extended by more than 30%, and the need for repair of traditional protective embankments is reduced, saving maintenance costs, while reducing the use of traditional hard materials, and greatly reducing the impact on marine ecology. By adjusting the refractive index distribution and unit arrangement, dynamic response protection capabilities can be provided under extreme sea conditions, thereby modulating the energy distribution of surface waves to achieve focusing, scattering or absorption of waves, effectively reducing the direct impact of waves on the seawall, thereby enhancing the protection effect and reducing long-term maintenance costs.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A seawall protection structure design method based on winding space metasurface technology, characterized in that: The seawall protection structure design method includes the following steps: S1. Select an appropriate winding space metasurface unit model according to the frequency parameters and wave height parameters of the waves; S2. Design and optimize the winding space metasurface unit model based on the preset refractive index distribution; S3, arranging and installing the designed and optimized coiled space metasurface unit model array outside the seawall and debugging it; S4. By real-time monitoring of sea conditions, the placement and refractive index of the winding space metasurface unit model are adjusted to cope with different wave conditions.

2. The method for designing a seawall protection structure based on the winding space metasurface technology according to claim 1 is characterized in that: The design and optimization of the winding space metasurface unit model based on the preset refractive index distribution includes the following steps: S21. Based on the requirements of the winding space hypersurface unit model, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to construct the initial winding space hypersurface unit model design framework; S22. Based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, the performance of the winding space metasurface unit model is optimized by adjusting the geometric parameters.

3. The method for designing a seawall protection structure based on the winding space metasurface technology according to claim 2 is characterized in that: The method of designing a zigzag channel and a straight channel based on target requirements, presetting geometric parameters, and constructing an initial winding space metasurface unit model design framework includes the following steps: S211. Design the geometric structure of the zigzag channel to extend the wave propagation distance through the tortuous path, produce phase delay, and form a high refractive index area; S212, setting straight channels in parallel to provide impedance matching paths for zigzag channels, ensuring the overall performance of the winding space metasurface unit model structure, and optimizing the transmission efficiency of waves; S213, based on the frequency, wavelength and wave speed of the water surface wave, and according to the proportional relationship between the geometric parameters of the wave and the zigzag channel, setting initial parameters for the winding space metasurface unit model structure; S214. Through the channel width formula, combined with the relationship between the thickness of the rigid plate and the number of winding channels, the parameter calculation and structural design of the winding space metasurface unit model are completed.

4. The method for designing a seawall protection structure based on the winding space metasurface technology according to claim 3 is characterized in that: The functional requirements of the winding space super surface unit model based on the refractive index distribution and optimizing the performance of the winding space super surface unit model by adjusting the geometric parameters include the following steps: S221. Based on the effective medium theory, the relative refractive index distribution of the winding space metasurface unit model is controlled by adjusting the length and width of the zigzag channel, and the rate of change of the refractive index is determined; S222, determining an optimization parameter range based on analyzing the relationship between the relative effective refractive index and the change in the energy transmission efficiency zigzag channel length; S223. According to the optimization analysis results, the geometric parameters of the zigzag channel are adjusted to improve the wave modulation efficiency and reduce the phase loss; S224. Draw a relationship diagram between geometric parameters and refractive index distribution to verify whether the performance of the winding space metasurface unit model meets the design requirements. If so, design is carried out; if not, adjustments and improvements are made.

5. The method for designing a seawall protection structure based on the winding space metasurface technology according to claim 4 is characterized in that: The channel width formula is: d =（ a -8 w ） / N ； In the formula, d Indicates the zigzag channel width; w The thickness of the rigid plate represented by; N Indicates the number of zigzag channels; a Represents the total width of the warped space hypersurface unit model.

6. The method for designing a seawall protection structure based on the winding space metasurface technology according to claim 5 is characterized in that: The refractive index distribution formula is: n ( y )= n 0sech( αy ); In the formula, n 0 represents the maximum refractive index of the metasurface unit at the center of the model array; y represents the distance between the winding space metasurface unit model and the array center; sech represents the hyperbolic sine function; α Represents the constant that controls the refractive index gradient.

7. The method for designing a seawall protection structure based on the winding space metasurface technology according to claim 6 is characterized in that: The formula for determining the rate of change of refractive index is: α =cosh -1 ( n 0 / n L ) / L ; In the formula, α represents the constant controlling the refractive index gradient; n L represents the refractive index of the edge-most coiled space metasurface unit 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 to the edge of the model array; cosh represents the hyperbolic cosine function.

8. The method for designing a seawall protection structure based on the winding space metasurface technology according to claim 1 is characterized in that: The method of arranging and installing the designed and optimized coiled space metasurface unit model array outside the seawall and debugging the array includes the following steps: S31, arranging a high-refractive-index winding space metasurface unit model in a target area to form a focusing effect of a water surface wave, measuring the characteristics of the focusing area, and adjusting the refractive index distribution in a spherical form to observe changes in focal length; S32, adjusting the refractive index distribution, arranging the winding space metasurface unit model in increasing order according to the refractive index, forming a scattering effect of the water surface wave, observing the change in the amplitude of the water surface wave in the scattering area, confirming that the amplitude in the shadow area is reduced to the design target, and determining the minimum amplitude position of the far-field water surface wave amplitude; S33, adjust the design of the combination of zigzag channel and straight channel, optimize the wave energy absorption ratio, 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; S34. Conduct an overall performance evaluation of the coiled space metasurface unit model array to confirm its focusing and scattering effects in the target area.

9. A seawall protection structure design system based on winding space metasurface technology, used to implement the seawall protection structure design method based on winding space metasurface technology as described in any one of claims 1 to 8, characterized in that: The seawall protection structure design system includes: The parameter design and adaptation module is used to select an adaptive winding space metasurface unit model according to the frequency parameters and wave height parameters of the waves; Model design and optimization module, used to design and optimize the unit model of the winding space metasurface based on the preset refractive index distribution; The structural layout and debugging module is used to arrange and install the designed coiled space metasurface unit model array outside the seawall and conduct debugging; The real-time monitoring and adjustment module is used to adjust the placement and refractive index of the winding space metasurface unit model to cope with different wave conditions by real-time monitoring of the sea conditions.

10. The seawall protection structure design system based on the winding space metasurface technology according to claim 9 is characterized in that: The design and optimization of the winding space metasurface unit model based on the preset refractive index distribution includes: Based on the requirements of the winding space hypersurface unit model, the zigzag channel and the straight channel are designed, and the geometric parameters are preset to build the initial winding space hypersurface unit model design framework; Based on the functional requirements of the refractive index distribution on the winding space metasurface unit model, the performance of the winding space metasurface unit model is optimized by adjusting the geometric parameters.

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