A multi-helmholtz cavity nested integrated oscillating water column breakwater

Abstract

This invention discloses a multi-Helmholtz cavity nested integrated oscillating water column breakwater, relating to the field of breakwater technology. It includes a seabed surface, a low-frequency oscillating water column wave energy capture system, and a foundation support system. The foundation support system includes a HROWC foundation, a breakwater, and backfill material. The HROWC foundation is positioned on the seabed surface. The low-frequency oscillating water column wave energy capture system comprises an array of oscillating water column breakwater unit arrays arranged along the shoreline. Each adjacent oscillating water column breakwater unit array is connected by an array unit partition wall. The low-frequency oscillating water column wave energy capture system is positioned on the HROWC foundation, and the breakwater and backfill material are located at the rear of the low-frequency oscillating water column wave energy capture system. This invention overcomes the limitations of narrow resonant frequency bands and insufficient low-frequency response of single water columns, enhancing the oscillation response of medium- and long-period waves within the cavity over a wider frequency band, and improving wave energy capture capability under low-frequency swell conditions.

Description

Technical Field

[0001] This invention relates to the field of breakwater technology, specifically to a multi-Helmholtz cavity nested integrated oscillating water column breakwater. Background Technology

[0002] Wave energy is a continuously existing renewable energy source in the ocean. Compared to short-period wind waves near the coast, medium- and long-period swells often exist in the deep sea and waters surrounding islands and reefs. These swells are characterized by long wavelengths, long periods, long propagation distances, and slow energy attenuation. On the one hand, long-period swells exert a continuous dynamic effect on breakwaters, revetments, and nearshore engineering structures; on the other hand, they also provide an important energy source for the development of low-frequency wave energy. Therefore, how to achieve efficient absorption and utilization of low-frequency swells within a limited engineering scale is a key issue that needs to be addressed in the integrated design of wave energy devices and breakwaters.

[0003] Existing breakwater structures primarily reduce wave energy through reflection, fracturing, seepage, localized turbulence, or dissipation via porous media, offering some wave-damping effect for short-period waves. However, their ability to suppress low-frequency, long-period waves is relatively limited. Since the wavelength of long waves is much larger than the dimensions of conventional wave-damping components, traditional localized disturbance or fracturing energy dissipation mechanisms are insufficient. Improving low-frequency wave suppression by increasing the breakwater's dimensions, extending its layout, or adding auxiliary wave-damping components often leads to increased project costs, construction complexity, and the occupation of more nearshore and island / reef sea space. There is a clear contradiction between the efficient absorption of low-frequency, long waves and the need for spatially compact layout.

[0004] While some existing wave energy capture and wave damping integrated devices have adopted a multi-chamber arrangement, most structures still primarily consist of multiple chambers arranged side-by-side along the length of the breakwater, or a Helmholtz resonant structure in only one chamber, with the remaining chambers being ordinary oscillating water column chambers. Although this type of structure can improve the narrow bandwidth problem of single-chamber devices to some extent, it still has the following shortcomings: First, there is a lack of unified tuning design for low-frequency swells among different chambers, making it difficult to form continuous broadband absorption; second, multiple chambers mainly rely on planar parallel expansion, resulting in limited overall integration; and third, as the number of chambers increases, the device usually requires a longer breakwater axis or a larger sea area, which is not conducive to the intensive use of limited sea space in island, port, and nearshore engineering projects. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-Helmholtz cavity nested integrated oscillating water column breakwater, which arranges multiple Helmholtz resonant cavities in a nested, integrated, and compact manner within the same breakwater body. Unlike traditional parallel air chamber structures, this structure, through differentiated design of different chamber volumes, neck channels, and aperture sizes, allows multiple Helmholtz resonant cavities to correspond to different target frequency bands, forming low-frequency multi-point resonant absorption capability within a limited space. This approach can improve wave energy capture efficiency under long-period swell conditions and enhance the breakwater's ability to reduce low-frequency waves. It solves the technical problems mentioned in the background section.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A multi-Helmholtz cavity nested integrated oscillating water column breakwater includes a seabed surface, a low-frequency oscillating water column wave energy capture system, and a foundation support system. The foundation support system includes an HROWC foundation and breakwater and backfill material. The HROWC foundation is located on the seabed surface. The low-frequency oscillating water column wave energy capture system includes an array of oscillating water column breakwater units arranged along the shoreline. Each adjacent oscillating water column breakwater unit array is connected by an array unit partition wall. The low-frequency oscillating water column wave energy capture system is located on the HROWC foundation, and the breakwater and backfill material is located on the rear side of the low-frequency oscillating water column wave energy capture system.

[0007] Furthermore, the structural unit includes an air turbine, an arc-shaped anti-overflow component, a HROWC front wall, a first chamber bottom wall, a second chamber bottom wall, a HROWC bottom wall, a HROWC bottom corner, a HROWC rear wall, a first chamber, a second chamber, a third chamber, a HROWC top wall, a first chamber neck, a second chamber neck, a third chamber neck, a first HROWC internal partition wall, and a second HROWC internal partition wall; the HROWC front wall, HROWC rear wall, HROWC bottom wall, and HROWC top wall together constitute the external main frame of the structural unit; the arc-shaped anti-overflow component is located on the top outer side of the HROWC front wall and connected to the front end of the HROWC top wall; HROWC internal partition wall No. 1 and HROWC internal partition wall No. 2 are arranged parallel to each other between the front wall and the rear wall of HROWC, dividing the internal space of the structural unit into chamber No. 1, chamber No. 2 and chamber No. 3 in a horizontal sequence. The bottom wall of chamber No. 1 and the bottom wall of chamber No. 2 are both recessed stepped structures. The bottom wall of chamber No. 1 is connected to HROWC internal partition wall No. 1, and the bottom wall of chamber No. 2 is connected to HROWC internal partition wall No. 2. The bottom corner of HROWC is located at the bottom connection between the bottom wall and the rear wall of HROWC. The air turbine is installed on the top of the top wall of HROWC and communicates with the top openings of chambers No. 1, No. 2 and No. 3 respectively.

[0008] Furthermore, the neck of the first chamber is a channel connecting the bottom of the first chamber to the water body. The first chamber is enclosed by the front wall of the HROWC, the bottom wall of the first chamber, and the first internal partition wall of the HROWC. The top of the first chamber is connected to the air turbine through an opening on the top wall of the HROWC.

[0009] Furthermore, the neck of the second chamber is a channel connecting the bottom of the second chamber to the water body. The second chamber is enclosed by the bottom wall of the first chamber, the bottom wall of the second chamber, the first HROWC internal partition wall, and the second HROWC internal partition wall. The top of the second chamber is connected to the air turbine through an opening in the top wall of the HROWC.

[0010] Furthermore, the neck of the third chamber is a channel connecting the bottom of the third chamber to the water body. The third chamber is enclosed by the bottom wall of the second chamber, the bottom wall of the HROWC, the second internal partition wall of the HROWC, and the rear wall of the HROWC. The top of the third chamber is connected to the air turbine through an opening on the top wall of the HROWC.

[0011] Furthermore, the third chamber is formed by the enclosure of the HROWC top wall, the second HROWC inner partition wall, the second chamber bottom wall, the HROWC bottom wall, and the HROWC rear wall.

[0012] Furthermore, it also includes offshore waves existing on one side of the structural unit. When the offshore waves act on the multi-Helmholtz cavity nested integrated oscillating water column breakwater, the offshore waves enter the corresponding cavities through the first, second and third cavities of the cavities, respectively, and excite the first, second and third cavities of the structural unit to generate differentiated low-frequency resonant responses.

[0013] Furthermore, it also includes an oscillating water column in chamber one, an oscillating water column in chamber two, and an oscillating water column in chamber three. The oscillating water column in chamber one is the portion of the ocean waves entering chamber one, the oscillating water column in chamber two is the portion of the ocean waves entering chamber two, and the oscillating water column in chamber three is the portion of the ocean waves entering chamber three.

[0014] Compared with the prior art, the present invention has the following advantages: I. This invention integrates multiple Helmholtz resonant cavities in a nested arrangement with a breakwater. Based on the low-frequency swell wave conditions of the target sea area, the chamber volume, neck channel, aperture size, and opening form of each Helmholtz cavity are differentiated, allowing different resonant cavities to correspond to different target period ranges. Compared to traditional single-chamber OWC devices, this invention overcomes the limitations of narrow frequency bands and insufficient low-frequency response of single water column resonators, enhancing the oscillation response of medium- and long-period waves within the cavities over a wider frequency band, thus improving wave energy capture capabilities under low-frequency swell conditions. Simultaneously, the synergistic effect of multiple Helmholtz cavities enhances the absorption and dissipation of long-period wave energy, reducing the impact of low-frequency swells on port areas, shorelines, or land-based facilities behind the breakwater, and improving the overall wave dissipation performance of the breakwater.

[0015] II. This invention differs from the traditional structure of multiple air chambers arranged side-by-side along the length of the breakwater. It compactly integrates multiple Helmholtz resonant cavities within the same breakwater body, achieving synergistic utilization of wave energy capture, low-frequency wave dissipation, protective structure, and sea area. Without significantly increasing the external dimensions of the breakwater or the sea area used, it can create a multi-frequency, wide-bandgap low-frequency wave absorption effect, effectively improving energy utilization efficiency and wave dissipation capacity per unit structural scale. This structure has advantages such as high integration, small space occupation, high reliability, and relatively convenient construction and maintenance. It is suitable for scenarios such as deep-sea islands and reefs, near-shore port protection, shore-based power supply, and offshore off-grid marine engineering facilities, forming a novel, intensive engineering layout scheme that combines low-frequency surge absorption, wave energy utilization, and breakwater protection functions. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an integrated oscillating water column breakwater with nested multi-Helmholtz cavities provided in an embodiment of the present invention; Figure 2 An array structure arrangement diagram of a multi-Helmholtz cavity nested integrated oscillating water column breakwater provided in an embodiment of the present invention; Figure 3 A three-dimensional view from the left front perspective of a structural unit in a multi-Helmholtz cavity nested integrated oscillating water column breakwater provided for an embodiment of the present invention; Figure 4 A three-dimensional view from the right front perspective of a structural unit in a multi-Helmholtz cavity nested integrated oscillating water column breakwater provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the present invention.

[0018] The labels in the diagram represent the following: 1. Air turbine; 2. Arc-shaped wave-breaking structure; 3. HROWC front wall; 4. Chamber 1 bottom wall; 5. Chamber 2 bottom wall; 6. HROWC bottom wall; 7. HROWC bottom corner; 8. HROWC rear wall; 9. Chamber 1; 10. Chamber 2; 11. Chamber 3; 12. HROWC top wall; 13. Chamber 1 neck; 14. Chamber 2 neck; 15. Chamber 3 neck; 16. Open sea waves; 17. Seabed; 18. HROWC foundation; 19. Breakwater and backfill material; 20. Structural unit; 21. Oscillating water column breakwater unit array; 22. Array unit partition wall; 23. HROWC internal partition wall 1; 24. HROWC internal partition wall 2; 25. Oscillating water column inside chamber 1; 26. Oscillating water column inside chamber 2; 27. Oscillating water column inside chamber 3. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 5 As shown, the present invention provides a multi-Helmholtz cavity nested integrated oscillating water column breakwater, including a seabed surface 17, a low-frequency oscillating water column wave energy capture system and a foundation support system. The foundation support system includes an HROWC foundation 18 and breakwater and backfill material 19. The HROWC foundation 18 is set on the seabed surface 17. The low-frequency oscillating water column wave energy capture system includes an oscillating water column breakwater unit array 21 formed by multiple structural units 20 arranged in an array along the shoreline direction. Each adjacent oscillating water column breakwater unit array 21 is connected by an array unit partition wall 22. The low-frequency oscillating water column wave energy capture system is set on the HROWC foundation 18, and the breakwater and backfill material 19 is set on the rear side of the low-frequency oscillating water column wave energy capture system.

[0022] The energy capture performance of an oscillating water column (OWC) wave energy device is closely related to the resonant response of the water column within the chamber. Addressing the shortcomings of traditional single-chamber OWC devices, such as insufficient low-frequency response and narrow effective absorption bandwidth, as well as the large space requirements associated with conventional parallel arrangements in dual-chamber or multi-chamber OWC devices, this invention proposes a multi-Helmholtz cavity nested integrated oscillating water column breakwater designed for broadband absorption of low-frequency swell waves. Based on the Helmholtz wave resonance principle, this breakwater integrates multiple Helmholtz-type OWC chambers with different chamber volumes, neck channel lengths, aperture sizes, and opening forms within the same breakwater body. Unlike the traditional simple parallel expansion of multiple chambers, this invention arranges multiple Helmholtz chambers within a single structural unit 20 in a horizontal array, and integrates the neck channels of each chamber in a tiered manner along the water depth direction. This results in multiple necks being layered and nested within the vertical space, forming a multi-cavity integrated structure within the limited cross-sectional space of the breakwater.

[0023] Since the natural frequency of a Helmholtz resonator is closely related to parameters such as chamber volume, neck channel length, aperture size, and opening position, this invention can achieve differentiated natural frequencies for different Helmholtz cavities through horizontal arraying of chambers and vertical tiered arrangement of the neck, each corresponding to a different target surge period. This results in multi-cavity integration, multi-point resonance, and broadband absorption of low-frequency surge response characteristics. This overcomes the limitation of narrow absorption bandwidth in traditional single-chamber OWC devices, improving wave energy capture and wave dissipation under long-period surge conditions. Compared to traditional parallel multi-chamber OWC breakwaters, this invention achieves a compact nested arrangement of multiple Helmholtz cavities within the same breakwater structural unit 20 through horizontal arraying of chambers, vertical tiered integration of the neck, and reuse of breakwater cross-sectional space. This structure can simultaneously achieve broadband absorption of low-frequency surges, wave energy utilization, and breakwater protection functions without significantly increasing the external dimensions of the breakwater or the sea area used, forming a highly integrated oscillating water column breakwater structure suitable for islands, ports, and nearshore engineering.

[0024] It should be noted that the specific arrangement of the breakwater and backfill material 19 is not unique. It can be configured as a straight line, a broken line, a circular arc, or other adaptable form according to the actual shoreline, port terminal, island and reef foundation engineering, or other marine engineering facilities' planar layout requirements. Its main function is to provide an integrated structural carrier, stability support, and engineering protection foundation for the low-frequency oscillating water column wave energy capture system. All the aforementioned different arrangement forms, support methods, and equivalent structural deformations are within the scope of protection of this invention.

[0025] Specifically, structural unit 20 includes an air turbine 1, an arc-shaped anti-overflow component 2, a HROWC front wall 3, a first chamber bottom wall 4, a second chamber bottom wall 5, a HROWC bottom wall 6, a HROWC bottom corner 7, a HROWC rear wall 8, a first chamber 9, a second chamber 10, a third chamber 11, a HROWC top wall 12, a first chamber neck 13, a second chamber neck 14, a third chamber neck 15, a first HROWC internal partition wall 23, and a second HROWC internal partition wall 24; the HROWC front wall 3, the HROWC rear wall 8, the HROWC bottom wall 6, and the HROWC top wall 12 together constitute the external main frame of structural unit 20; the arc-shaped anti-overflow component 2 is located on the top outer side of the HROWC front wall 3, and together with the HROWC top wall 12... The front end is connected; HROWC internal partition wall 1 23 and HROWC internal partition wall 24 are set parallel between HROWC front wall 3 and HROWC rear wall 8, dividing the internal space of structural unit 20 into chamber 1 9, chamber 2 10 and chamber 3 11 in a horizontal direction; the bottom wall 4 of chamber 1 and the bottom wall 5 of chamber 2 are both recessed stepped structures, the bottom wall 4 of chamber 1 is connected to HROWC internal partition wall 1 23, and the bottom wall 5 of chamber 2 is connected to HROWC internal partition wall 2 24; HROWC bottom corner 7 is set at the bottom connection between HROWC bottom wall 6 and HROWC rear wall 8; air turbine 1 is installed on the top of HROWC top wall 12 and is connected to the top openings of chamber 1 9, chamber 2 10 and chamber 3 11 respectively.

[0026] More specifically, the neck 13 of chamber 1 is a channel connecting the bottom of chamber 1 9 to the water body. Chamber 1 9 is enclosed by the front wall 3 of HROWC, the bottom wall 4 of chamber 1, and the inner partition wall 23 of HROWC. The top of chamber 1 9 is connected to the air turbine 1 through an opening on the top wall 12 of HROWC.

[0027] More specifically, the neck 14 of chamber 2 is a channel connecting the bottom of chamber 2 10 to the water body. Chamber 2 10 is enclosed by the bottom wall 4 of chamber 1, the bottom wall 5 of chamber 2, the inner partition wall 1 of HROWC 23, and the inner partition wall 2 of HROWC 24. The top of chamber 2 10 is connected to the air turbine 1 through an opening on the top wall 12 of HROWC.

[0028] More specifically, the neck 15 of chamber 3 is a channel connecting the bottom of chamber 3 11 to the water body. Chamber 3 11 is enclosed by the bottom wall 5 of chamber 2, the bottom wall 6 of HROWC, the inner partition wall 24 of HROWC, and the rear wall 8 of HROWC. The top of chamber 3 11 is connected to the air turbine 1 through an opening on the top wall 12 of HROWC.

[0029] It should be noted that chambers 9 (Cavity 1), 10 (Cavity 2), and 11 (Cavity 3) are all designed based on the Helmholtz resonance principle of water waves. Their core lies in forming low-frequency water wave resonance through the structural feature of a "small neck – large chamber". The characteristic dimensions of necks 13 (Cavity 1), 14 (Cavity 2), and 15 (Cavity 3) directly affect the low-frequency resonance of their respective chambers. Generally, the longer the equivalent length of the neck and the smaller the aperture or opening size, the more the natural frequency of the corresponding chamber shifts towards the low-frequency region. By differentiating the volume, neck length, aperture size, and opening position of each chamber, chambers 9 (Cavity 1), 10 (Cavity 2), and 11 (Cavity 3) can have different natural frequencies, thus covering different target surge cycles.

[0030] This invention differs from the traditional structure of simply arranging two or more chambers side-by-side along the breakwater axis. Instead, it integrates chamber 9 (first chamber), 10 (second chamber), and 11 (third chamber) in a horizontal array, while simultaneously nesting chamber necks 13 (first chamber), 14 (second chamber), and 15 (third chamber) in a tiered manner from shallow to deep along the water depth. Through the horizontal array of chambers and the vertical tiered arrangement of the necks, multiple Helmholtz cavities can be compactly integrated within the limited cross-sectional space of the breakwater, maximizing the use of structural space and enabling the nested Helmholtz cavity structural unit 20 to generate multiple differentiated natural frequencies in the low-frequency region. This achieves multi-cavity integration, multi-point resonance, and broadband absorption of low-frequency swell waves, making it suitable for wave absorption and protection needs in South China Sea islands, nearshore ports, and related long-period swell areas.

[0031] Unlike the resonant response of traditional oscillating water column (OWC) devices, the HROWC, designed based on the Helmholtz wave resonance principle, exhibits a larger amplitude of water column motion within the chamber and more intense reciprocating flow of water in the neck channel under low-frequency resonance conditions. When water flows through the neck or sharp corners of the bottom wall, flow separation, vortex shedding, and turbulent energy dissipation easily occur, thereby reducing wave energy capture efficiency. Therefore, in the structural design, the sharp corners of the bottom walls of chamber 1 (4), chamber 2 (5), HROWC bottom wall 6, and HROWC bottom corner 7 can be rounded to reduce local flow separation and vortex dissipation, thereby improving energy capture efficiency and hydrodynamic stability under low-frequency resonance conditions.

[0032] The specific shapes of chambers 9 (number 1), 10 (number 2), and 11 (number 3) are not unique. The core principle lies in utilizing the "small neck – large chamber" structural characteristic of the Helmholtz resonator to achieve differentiated low-frequency resonance. The number of chambers is not limited to three; this implementation uses a three-chamber design as an example. In actual engineering, the number of chambers can be increased or decreased based on the target sea state, target absorption frequency band, breakwater cross-sectional dimensions, and construction conditions. The core principle is to achieve efficient space utilization and broadband low-frequency absorption within a limited structural scale through the nested integration of multiple Helmholtz cavities.

[0033] It should also be noted that the number and arrangement of air turbines 1 are not unique and can be determined based on the number of chambers, the natural frequency of the chambers, and the airflow output characteristics. Preferably, a corresponding customized air turbine, such as an impingement air turbine, can be configured for each Helmholtz chamber to adapt to the low-frequency, long-stroke water column motion, large-volume reciprocating flow, and high-speed periodic airflow output characteristics of the Helmholtz resonant chamber. If multiple chambers share the same air turbine, phase cancellation may occur due to airflow phase differences when Helmholtz resonance is excited in different chambers, resulting in a significant reduction in the net air inflow or outflow, thereby reducing wave absorption and energy capture effects. Therefore, setting independent or customized air turbines for different chambers is beneficial to improving the aerodynamic energy conversion efficiency of each chamber under low-frequency resonance conditions. The above equivalent substitutions, modifications, or adjustments are all within the scope of protection of this invention.

[0034] Specifically, it also includes the offshore wave 16 existing on one side of the structural unit 20. When the offshore wave 16 acts on the multi-Helmholtz cavity nested integrated oscillating water column breakwater, the offshore wave 16 enters the corresponding cavity through the first cavity neck 13, the second cavity neck 14 and the third cavity neck 15 respectively, which excites the first cavity 9, the second cavity 10 and the third cavity 11 in the structural unit 20 to generate differentiated low-frequency resonant responses.

[0035] Specifically, it also includes oscillating water column 25 in chamber 1, oscillating water column 26 in chamber 2, and oscillating water column 27 in chamber 3. Oscillating water column 25 in chamber 1 is the part of the outer sea wave 16 entering chamber 1 9. Oscillating water column 26 in chamber 2 is the part of the outer sea wave 16 entering chamber 2 10. Oscillating water column 27 in chamber 3 is the part of the outer sea wave 16 entering chamber 3 11.

[0036] In summary, this invention integrates multiple Helmholtz resonant cavities in a nested arrangement with the breakwater. Based on the low-frequency swell wave conditions of the target sea area, the chamber volume, neck channel, aperture size, and opening form of each Helmholtz cavity are differentiated, allowing different resonant cavities to correspond to different target period ranges. Compared to traditional single-chamber OWC devices, this invention overcomes the limitations of narrow frequency bands and insufficient low-frequency response of single water column resonators, enhancing the oscillation response of medium- and long-period waves within the cavities over a wider frequency band, thus improving wave energy capture capabilities under low-frequency swell conditions. Simultaneously, the synergistic effect of multiple Helmholtz cavities enhances the absorption and dissipation of long-period wave energy, reducing the impact of low-frequency swells on port areas, shorelines, or land-based facilities behind the breakwater, and improving the overall wave dissipation performance of the breakwater.

[0037] This invention differs from the traditional multi-chamber, parallel arrangement along the length of a breakwater. It compactly integrates multiple Helmholtz resonant cavities within the same breakwater body, achieving synergistic utilization of wave energy capture, low-frequency wave dissipation, protective structure, and sea area. Without significantly increasing the external dimensions of the breakwater or the sea area used, it can create a multi-frequency, broadband low-frequency wave absorption effect, effectively improving energy utilization efficiency and wave dissipation capacity per unit structural scale. This structure boasts advantages such as high integration, small space occupation, high reliability, and relatively convenient construction and maintenance. It is suitable for scenarios such as deep-sea islands and reefs, near-shore port protection, shore-based power supply, and offshore / off-grid marine engineering facilities, forming a novel, intensive engineering layout scheme that combines low-frequency surge absorption, wave energy utilization, and breakwater protection functions.

[0038] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0039] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A multi-Helmholtz cavity nested integrated oscillating water column breakwater, comprising a seabed surface (17), characterized in that, It also includes a low-frequency oscillating water column wave energy capture system and a foundation support system. The foundation support system includes an HROWC foundation (18) and a breakwater and backfill material (19). The HROWC foundation (18) is set on the seabed surface (17). The low-frequency oscillating water column wave energy capture system includes an oscillating water column breakwater unit array (21) formed by multiple structural units (20) arranged in an array along the shoreline direction. Each adjacent oscillating water column breakwater unit array (21) is connected by an array unit partition wall (22). The low-frequency oscillating water column wave energy capture system is set on the HROWC foundation (18). The breakwater and backfill material (19) is set on the rear side of the low-frequency oscillating water column wave energy capture system.

2. The multi-Helmholtz cavity nested integrated oscillating water column breakwater according to claim 1, characterized in that, The structural unit (20) includes an air turbine (1), an arc-shaped anti-overflow component (2), a HROWC front wall (3), a first chamber bottom wall (4), a second chamber bottom wall (5), a HROWC bottom wall (6), a HROWC bottom corner (7), a HROWC rear wall (8), a first chamber (9), a second chamber (10), a third chamber (11), a HROWC top wall (12), a first chamber neck (13), a second chamber neck (14), a third chamber neck (15), a first HROWC internal partition wall (23), and a second HROWC internal partition wall (24). The HROWC front wall (3), the HROWC rear wall (8), the HROWC bottom wall (6), and the HROWC top wall (12) together form the external main frame of the structural unit (20). The arc-shaped anti-overflow component (2) is located on the top outer side of the HROWC front wall (3) and the front end of the HROWC top wall (12). Connected; the first (23) and the second (24) of the HROWC internal partition wall are arranged parallel between the front wall (3) and the rear wall (8) of the HROWC, dividing the internal space of the structural unit (20) into chamber 1 (9), chamber 2 (10) and chamber 3 (11) in a horizontal direction; the bottom wall (4) of chamber 1 and the bottom wall (5) of chamber 2 are both stepped structures that are recessed inward, the bottom wall (4) of chamber 1 (5) of chamber 2 (5) of chamber 2 (5) 4) Connected to the first partition wall (23) of HROWC, the bottom wall (5) of the second chamber is connected to the second partition wall (24) of HROWC; the bottom corner (7) of HROWC is set at the bottom connection between the bottom wall (6) of HROWC and the rear wall (8) of HROWC; the air turbine (1) is installed on the top of the top wall (12) of HROWC and is connected to the top openings of the first chamber (9), the second chamber (10) and the third chamber (11) respectively.

3. The multi-Helmholtz cavity nested integrated oscillating water column breakwater according to claim 2, characterized in that, The neck (13) of the first chamber is a channel connecting the bottom of the first chamber (9) to the water body. The first chamber (9) is enclosed by the front wall (3) of HROWC, the bottom wall (4) of the first chamber, and the first internal partition wall (23) of HROWC. The top of the first chamber (9) is connected to the air turbine (1) through an opening on the top wall (12) of HROWC.

4. The multi-Helmholtz cavity nested integrated oscillating water column breakwater according to claim 2, characterized in that, The neck (14) of the second chamber is a channel connecting the bottom of the second chamber (10) to the water body. The second chamber (10) is enclosed by the bottom wall (4) of the first chamber, the bottom wall (5) of the second chamber, the first partition wall (23) of the HROWC and the second partition wall (24) of the HROWC. The top of the second chamber (10) is connected to the air turbine (1) through an opening on the top wall (12) of the HROWC.

5. The multi-Helmholtz cavity nested integrated oscillating water column breakwater according to claim 2, characterized in that, The neck (15) of the third chamber is a channel connecting the bottom of the third chamber (11) to the water body. The third chamber (11) is enclosed by the bottom wall (5) of the second chamber, the bottom wall (6) of HROWC, the second inner partition wall (24) of HROWC and the rear wall (8) of HROWC. The top of the third chamber (11) is connected to the air turbine (1) through an opening on the top wall (12) of HROWC.

6. The multi-Helmholtz cavity nested integrated oscillating water column breakwater according to claim 1, characterized in that, It also includes the offshore waves (16) existing on one side of the structural unit (20). When the offshore waves (16) act on the multi-Helmholtz cavity nested integrated oscillating water column breakwater, the offshore waves (16) enter the corresponding cavities through the first cavity neck (13), the second cavity neck (14) and the third cavity neck (15) respectively, and stimulate the first cavity (9), the second cavity (10) and the third cavity (11) in the structural unit (20) to generate differentiated low-frequency resonance responses.

7. The multi-Helmholtz cavity nested integrated oscillating water column breakwater according to claim 1, characterized in that, It also includes an oscillating water column (25) in chamber one, an oscillating water column (26) in chamber two, and an oscillating water column (27) in chamber three. The oscillating water column (25) in chamber one is the part of the outer sea wave (16) entering chamber one (9). The oscillating water column (26) in chamber two is the part of the outer sea wave (16) entering chamber two (10). The oscillating water column (27) in chamber three is the part of the outer sea wave (16) entering chamber three (11).

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