Submarine cable scour protection device

Abstract

The embodiment of the invention provides a submarine cable scour protection device. The submarine cable scour protection device is internally provided with a flexible scour protection structure used for wrapping a submarine cable; the rigid scouring protection structure is used for providing ballast gravity for the flexible scouring protection structure, division and cooperation of flexibility and rigidity are achieved, and the conflict of a traditional scheme on the protection function and the ballast function is systematically solved. The flexible structure focuses on close-fitting protection of the submarine cable, and the rigid structure provides stable anchoring force, so that the protection effect on the submarine cable is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manufacturing of submarine cable scour protection devices, and in particular to a submarine cable scour protection device. BACKGROUND

[0002] The submarine cable undertakes the power transmission and communication control task of the offshore wind farm, and is the lifeline channel of the offshore wind farm, and its safety and stability is directly related to the operation of the offshore wind farm. Under the action of wave flow, the submarine cable often faces the risk of scouring and being exposed, and when the scouring is severe, even the situation of hanging and oscillating occurs, and the submarine cable is prone to fatigue damage and affects the service life. In the related technology, the stone cage or concrete or bionic water grass is usually used to cover the submarine cable for pressure loading to protect the submarine cable from scouring, but the stone cage and other buffers with large self-weight are easy to cause collision and wear on the surface of the submarine cable, and the bionic water grass cannot play a scouring protection effect under high flow speed. SUMMARY

[0003] Embodiments of the present application provide a submarine cable scour protection device to overcome the above problems or at least partially solve the above problems.

[0004] Embodiments of the present application disclose a submarine cable scour protection device, the submarine cable scour protection device comprising:

[0005] a flexible scour protection structure for wrapping the submarine cable;

[0006] a rigid scour protection structure for providing pressure loading gravity for the flexible scour protection structure;

[0007] A connecting piece is arranged between the flexible scour protection structure and the rigid scour protection structure to prevent the flexible scour protection structure and the rigid scour protection structure from separating.

[0008] Optionally, the connecting piece is an adjustable connecting piece.

[0009] The submarine cable scour protection device comprises:

[0010] a flow rate and pressure sensor, and a data processing module;

[0011] The flow rate and pressure sensor is used to monitor water flow speed and stress data.

[0012] The processing module is used to generate a deformation signal for the adjustable connecting piece through the water flow speed and the stress data.

[0013] The adjustable connecting piece is configured to adjust the gap width between the flexible scour protection structure and the rigid scour protection structure based on the deformation signal.

[0014] Optionally, the flexible scour protection structure is a sand protection bag.

[0015] The sand protection bag covers the submarine cable from above and both sides in the direction perpendicular to the submarine cable.

[0016] The internal filler of the sand protection bag is silt with a particle volume less than a preset threshold.

[0017] Optionally, the rigid scour protection structure is at least one group of protection stone cages.

[0018] The protection stone cages are symmetrically arranged on both sides of the sand protection bag in the direction perpendicular to the submarine cable.

[0019] Optionally, the rigid scour protection structure is a plurality of groups of protection stone cages.

[0020] The plurality of groups of protection stone cages are arranged in an extending direction away from the submarine cable.

[0021] The sand protection bag and the protection stone cages, and the plurality of groups of protection stone cages are connected by anchor chains.

[0022] Optionally, the protection stone cage is composed of a rigid truss skeleton and a rigid netting on the side to form a closed space.

[0023] Optionally, the sand protection bag and the protection stone cage are provided with a baffle at the top.

[0024] The surface of the baffle is provided with a flow guide structure for guiding the water flow; the shape of the flow guide structure is used to guide the water flow to cause silt accumulation.

[0025] Optionally, the baffle is further provided with a floating curtain at the top.

[0026] The floating curtain is suspended in the water body and connected to the baffle by an anchor chain.

[0027] The floating curtain is used to further weaken the water power above the baffle.

[0028] Optionally, the sand protection bag and the protection stone cage are provided with anchor piles at the bottom.

[0029] Optionally, the end protection stone cage away from the submarine cable is provided with a flow guide plate.

[0030] The flow guide plate is supported and fixed by a support truss below.

[0031] The bottom of the flow guide plate is provided with a sawtooth structure on the side facing the water flow.

[0032] The embodiments of the present application have the following advantages:

[0033] This invention, through the inclusion of a flexible scour protection structure for encasing the submarine cable and a rigid scour protection structure for providing ballast weight to the flexible structure, achieves a division of labor between flexibility and rigidity, systematically resolving the conflict between the "protection" and "ballast" functions in traditional solutions. The flexible structure focuses on close-fitting protection of the submarine cable, while the rigid structure provides stable anchoring force, thereby improving the protective effect on the submarine cable. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a structure for a submarine cable scour protection device provided in an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of another structure for a submarine cable scour protection device provided in an embodiment of the present invention.

[0037] Figure label:

[0038] Submarine cable 101, flexible erosion protection structure 102, rigid erosion protection structure 103;

[0039] Submarine cable 201, protective sand cover 202, protective gabion 203, anchor chain 204, flow guide plate 205, baffle 206, floating curtain 207, anchor pile 208. Detailed Implementation

[0040] 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, not all, of the embodiments of the present invention. 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.

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] refer to Figure 1 , Figure 1 This is a schematic diagram of a submarine cable erosion protection device provided in an embodiment of the present invention; the submarine cable erosion protection device includes:

[0043] Flexible erosion protection structure 102 for wrapping submarine cable 101;

[0044] A rigid erosion protection structure 103 is used to provide ballast gravity for the flexible erosion protection structure 102.

[0045] Flexible erosion protection structure 102:

[0046] Purpose and intended use:

[0047] Purpose of this design: To address the wear and damage that may occur when traditional rigid structures (such as gabions) come into direct contact with submarine cables.

[0048] Application: It is flexibly wrapped around the surface of submarine cable 101 as the first line of defense. It directly adheres to the cable, providing basic ballast and protection while avoiding mechanical damage to the cable sheath.

[0049] Beneficial effects:

[0050] Preventing cable wear: Flexible materials are used to ensure that while in close contact with the cable, friction and wear will not occur due to the cable's own weight or relative movement, thus extending the cable's service life.

[0051] Good adaptability: The flexible structure can better adapt to the shape and slight movement of the submarine cable itself, providing all-round fit and protection.

[0052] Rigid erosion protection structure 103:

[0053] Purpose and intended use:

[0054] Purpose of the design: To provide the flexible structure with sufficient ballast gravity, far exceeding the weight of the flexible structure itself, to resist the strong scouring force of the water flow.

[0055] Application: Modularly arranged near flexible structures, the entire protective system is secured by its own large mass (such as a gabion filled with gravel), ensuring its stability and preventing displacement on the seabed.

[0056] Beneficial effects:

[0057] Enhanced ballast capacity: Provides the main ballast weight, effectively preventing the submarine cable from being suspended and vibrating due to scouring under strong water flow.

[0058] Protecting submarine cables: While bearing the main ballast load, the rigid structure avoids potential damage to the submarine cables because it does not directly contact them. This cleverly decouples the two functions of "ballast" and "protection," allowing each to perform its specific role.

[0059] This invention, through the inclusion of a flexible scour protection structure for encasing the submarine cable and a rigid scour protection structure for providing ballast weight to the flexible structure, achieves a division of labor between flexibility and rigidity, systematically resolving the conflict between the "protection" and "ballast" functions in traditional solutions. The flexible structure focuses on close-fitting protection of the submarine cable, while the rigid structure provides stable anchoring force, thereby improving the protective effect on the submarine cable.

[0060] Connector:

[0061] Purpose and intended use:

[0062] Purpose of the design: To ensure that the flexible and rigid protective structures can work together as a whole in underwater environments, especially under strong ocean currents, wave impacts, or changes in seabed topography, and to prevent them from shifting relative to each other, or even separating, due to uneven stress or uneven settlement.

[0063] Application: It acts as a "link" between flexible and rigid structures. It must allow a certain degree of relative movement (to accommodate uneven settlement) while providing sufficient restraint to prevent the two from separating under external forces, thereby maintaining the integrity of the entire protection system.

[0064] Beneficial effects:

[0065] Ensuring structural integrity: Under dynamic loads such as water flow and waves, the connectors can firmly connect the flexible and rigid structures together, preventing displacement or failure due to excessive stress on a single module, and ensuring the coordinated function of the entire protective device.

[0066] Improved overall stability: By connecting the flexible sand blanket and the rigid gabion into a larger system, the overall inertia of the system is increased, making it more difficult to be pushed or eroded by water flow, thus improving the system's resistance to displacement and rollover.

[0067] Adapting to changes in terrain: If adjustable or flexible connectors (such as anchor chains) are used, these connectors can also allow limited relative movement between modules, thereby adapting to local uneven settlement of the seabed and avoiding structural stress concentration and damage caused by rigid connections.

[0068] Optimized protection: Separation of the flexible and rigid structures would lead to the failure of the protection system. The connectors ensure that the flexible structure always remains above the submarine cable, receiving the ballast force provided by the rigid structure, thereby continuously and effectively protecting the submarine cable and maintaining the expected erosion resistance.

[0069] Optionally, the rigid scour protection structure 103 can be disposed on both sides of the flexible scour protection structure 102 or on the top of the flexible scour protection structure 102.

[0070] When the rigid scour protection structure 103 is disposed on both sides of the flexible scour protection structure 102, the rigid structure 103 and the flexible structure 102 are arranged side by side, and the core function of the connector is to prevent them from separating and shifting laterally in the horizontal direction.

[0071] Key design considerations for connectors:

[0072] Lateral connection: The connector needs to span across the flexible structure to tightly connect the rigid structures on both sides.

[0073] A balance of flexibility and rigidity: The connectors themselves need to possess a certain degree of flexibility to allow for limited relative movement of the rigid structure during uneven settlement. For example, high-strength anchor chains or flexible steel wire ropes can be used, which can provide strong tensile strength to prevent separation while also adapting to changes in seabed topography.

[0074] Special function of connectors:

[0075] Forming an overall frame: The connectors, together with the rigid structures on both sides, form a "U"-shaped or "groove-shaped" protective frame for the flexible structure, "fixing" the submarine cable and the flexible structure inside the frame.

[0076] Sharing the horizontal scouring force: Under the impact of strong lateral water flow, the connector can help the rigid structures on both sides to share the horizontal force, enhancing the overall resistance to lateral displacement.

[0077] When the rigid scour protection structure 103 is set on top of the flexible scour protection structure 102, the rigid structure 103 is superimposed on the flexible structure 102. The core function of the connector is to prevent them from sliding or falling off in the vertical direction.

[0078] Key design considerations for connectors:

[0079] Vertical fixation: The connector needs to pass through or around the flexible structure from the top rigid structure and connect to the anchor point on the seabed or the counterweight structure at the bottom of the flexible structure.

[0080] To avoid wear: Special attention must be paid to the contact parts between the connectors and the flexible structure and submarine cable during the design process. Padding or coating should be added to avoid wear caused by vertical friction and vibration.

[0081] Special function of connectors:

[0082] Providing ballast force: The main function of the connector is to evenly transfer the huge ballast force of the rigid structure to the flexible structure and submarine cable below, ensuring the ballast effect.

[0083] To prevent lateral slippage: Although the primary force direction is vertical, the connectors must provide sufficient lateral restraint to prevent the rigid structure at the top from slipping off the flexible structure when encountering strong water flow. This may require a wraparound or cage-like connection design.

[0084] In summary, when the rigid structure is on both sides, the connectors act as a "pull," primarily resisting horizontal separation; while when the rigid structure is at the top, the connectors act as a "bind," primarily resisting vertical slippage and detachment. The design concepts and focuses are completely different in these two cases.

[0085] Based on the above embodiments, modified embodiments of the above embodiments are proposed. It should be noted that, in order to keep the description brief, only the differences from the above embodiments are described in the modified embodiments.

[0086] In an optional embodiment of the present invention, the connector is an adjustable connector;

[0087] The submarine cable scour protection device includes:

[0088] Flow rate and pressure sensors, and a data processing module;

[0089] The flow velocity and pressure sensors are used to monitor water flow velocity and force data;

[0090] The processing module is used to generate a deformation signal for the adjustable connector based on the water flow velocity and the force data.

[0091] The adjustable connector is configured to adjust the gap width between the flexible erosion protection structure and the rigid erosion protection structure based on the deformation signal.

[0092] An adjustable connector is a connection device that can actively change its shape or size. Unlike traditional fixed connectors (such as bolts, rivets, or simple anchor chains), it can contract, extend, or adjust its angle according to changes in external signals or environmental conditions, thereby changing the relative position or gap between the two connected objects.

[0093] Adjustable connectors can be implemented in several ways, including:

[0094] 1. Shape memory alloy (SMA) connectors;

[0095] Principle: It utilizes the shape memory effect of shape memory alloys, that is, when the alloy is heated or electrified, it will return to a pre-set shape.

[0096] Application: Integrating SMA wires or springs into connectors. When the sensor detects a high flow rate signal, the data processing module sends an electrical pulse, heating and contracting the SMA, thereby closing the distance between the flexible and rigid structures and enhancing overall rigidity. When the signal disappears, the SMA cools and returns to its original shape, and the connector relaxes.

[0097] 2. Hydraulic or pneumatic connectors;

[0098] Principle: By controlling the piston or air bladder inside the connector to extend or retract, the length of the connector can be changed.

[0099] Application: The connector contains a miniature hydraulic or pneumatic cylinder. Based on environmental data, the data processing module controls the valve to open or close, driving the piston to precisely adjust the gap width. This method offers advantages such as fast response and high force.

[0100] 3. Electric or mechanical connectors;

[0101] Principle: By using mechanical structures such as motors, lead screws or gears, electrical energy is converted into mechanical motion to achieve the extension and retraction of the connecting parts.

[0102] Application: A small stepper motor is installed inside the connector, which drives a lead screw or gear mechanism to change the length of the connector. Although this method may have a slower response time, it offers high control precision and allows for finer adjustments.

[0103] Adjustable connectors are the core components for achieving "intelligent" protection, enabling protective devices to shift from passively withstanding the external environment to actively adapting to it.

[0104] Purpose and application of adjustable connectors:

[0105] Objective: To endow protective devices with the ability to dynamically adjust, enabling them to automatically change the gap between flexible and rigid structures according to changes in the actual hydrological environment (flow velocity, wave impact), thereby optimizing the overall protective effect.

[0106] Application: It acts as an "actuator" between flexible and rigid structures. It can actively contract or expand according to the received deformation signals, adjusting the distance between the two to form a tighter or looser connection.

[0107] Beneficial effects:

[0108] Dynamic adaptability: This solves the problem that static connectors cannot cope with complex and ever-changing marine environments. When encountering extreme conditions such as strong currents and large waves, the gaps can be tightened to enhance overall rigidity and resist impacts; when the flow velocity decreases, the gaps can be loosened to restore flexibility and adapt to uneven settlement.

[0109] Improved reliability: Through dynamic adjustment, excessive local stress or protection failure caused by a fixed "one-size-fits-all" design is avoided, which greatly improves the stability and reliability of the device under different operating conditions.

[0110] Flow velocity and pressure sensors act as the "eyes" and "touch" for real-time monitoring of the underwater environment. Flow velocity sensors measure the speed of water flow, while pressure sensors measure the pressure exerted by the water flow on protective devices.

[0111] Purpose and application of the flow rate and pressure sensors and data processing module:

[0112] Objective: To collect dynamic data on the hydrological environment around the submarine cable to provide basic information for subsequent intelligent control.

[0113] use:

[0114] Flow velocity sensor: continuously measures water flow velocity to determine whether the current water is calm or a complex environment with strong currents or rapids.

[0115] Pressure sensor: The actual water flow impact force that the sensing device withstands directly reflects the load effect of the external environment on the structure.

[0116] Data processing module: Acting as the "brain" of the system, it is responsible for receiving sensor data, analyzing the current hydrological environment, and generating corresponding deformation signals according to preset control logic or algorithms to command the adjustable connectors to perform actions.

[0117] The process of generating deformation signals for the adjustable connector based on the water flow velocity and the force data can be summarized as an automated control flow from data input to command output. It relies on pre-set control logic or algorithms.

[0118] Here are some specific ways to achieve this process:

[0119] 1. Simple control logic based on threshold:

[0120] One or more thresholds are preset in the data processing module, such as the flow rate threshold Vth and the pressure threshold Pth.

[0121] When the flow velocity V > Vth or the pressure P > Pth, the system determines that it is a high-intensity hydrological environment.

[0122] At this moment, the data processing module immediately generates a tightening signal and transmits it to the adjustable connector, instructing it to contract and reduce the gap width.

[0123] When the flow rate V ≤ Vth or the pressure P ≤ Pth, the system is judged to be in a normal or low-intensity environment.

[0124] At this point, the data processing module generates a relaxation signal, instructing the connector to relax and return to the initial gap width.

[0125] 2. Intelligent control based on fuzzy logic is closer to "intelligent" and can handle more complex environmental changes.

[0126] The flow rate and pressure data are fuzzified, and their monitored values ​​(flow rate and pressure) are divided into multiple levels, such as "low speed", "medium speed", and "high speed".

[0127] Establish a fuzzy rule base, for example:

[0128] If the flow rate is "medium" and the pressure is "medium", then the first deformation signal is "slight tightening".

[0129] If the flow rate is "high" and the pressure is "high", then the second deformation signal is "fully tightened".

[0130] If the flow rate level is "low" and the pressure level is "low", then the third deformation signal is "relaxation".

[0131] The data processing module searches for matching rules in the rule base based on real-time data and generates a precise value for the deformation signal, rather than a simple "tighten" or "relax" instruction.

[0132] 3. Closed-loop control based on the PID (proportional-integral-derivative) algorithm is a more accurate and stable control method that can continuously optimize performance.

[0133] Set a target parameter, such as the ideal deformation of the connector or the ideal force value.

[0134] The data processing module compares the real-time pressure value (actual value) measured by the sensor with the preset target pressure value (target value) to obtain the error.

[0135] The PID algorithm uses this error to calculate the deformation signal that needs to be applied to the adjustable connector.

[0136] Proportional term (P): Determines the strength of the deformation signal based on the current error magnitude.

[0137] Integral term (I): Eliminates long-standing errors to ensure that the target value is finally reached.

[0138] Differential term (D): The trend of change in prediction error, adjusted in advance to avoid overshoot or oscillation.

[0139] Through this feedback loop, the system can continuously and smoothly adjust the connectors to keep them in the optimal state to resist the impact of the current water flow.

[0140] By combining sensor data with preset control logic or algorithms, the data processing module can transform abstract environmental information (flow rate, pressure) into specific physical commands (deformation signals), thereby achieving automated and intelligent control of adjustable connectors.

[0141] Beneficial effects:

[0142] Intelligent control: The passive protection system has been upgraded to an active response system, achieving true intelligence. The device can "sense" changes in the external environment and "autonomously" make optimal adjustments.

[0143] Precision management: This avoids blind adjustments or human intervention. The system can precisely control the deformation of connectors based on real-time data, ensuring that every adjustment is for achieving the best protective state.

[0144] Reduced operation and maintenance costs: Adaptive devices reduce the frequency of manual inspections and maintenance. Through the data processing module, the device's operating status can be remotely monitored, and early warnings can be issued before anomalies occur.

[0145] This transforms the entire protective device from a static physical structure into an intelligent system with sensing, decision-making, and execution capabilities. This not only enhances its technological sophistication but also makes it more innovative and practical in dealing with complex marine environments.

[0146] refer to Figure 2 , Figure 2 This is a schematic diagram of another structure for a submarine cable scour protection device provided in an embodiment of the present invention;

[0147] Optionally, the flexible erosion protection structure is a protective sand blanket;

[0148] The protective sand is applied to the top and sides of the submarine cable in a direction perpendicular to the submarine cable.

[0149] The protective sandbag is filled with mud and sand with particle volume smaller than a preset threshold.

[0150] Flexible erosion protection structure for protecting sand dunes

[0151] Purpose and intended use:

[0152] Purpose: To provide a flexible and malleable protective material to solve the problem of wear and tear on the surface of submarine cables caused by traditional rigid gabions.

[0153] Application: As a protective layer for submarine cables in direct contact. The protective sand utilizes its flexible material and internal filler to provide ballast while better conforming to the cable surface, preventing damage from any hard contact.

[0154] Beneficial effects:

[0155] Protecting submarine cables: Flexible materials can effectively prevent wear and tear on the surface of submarine cables under long-term ballast, thus extending their service life.

[0156] Terrain adaptability: Compared to rigid structures, protective sand sheets are better able to adapt to subtle changes in seabed topography and the natural curvature of submarine cables, providing more uniform protection.

[0157] The protective sand is placed on top of and to both sides of the submarine cable in a direction perpendicular to the cable. The purpose of this is to ensure that the protective sand can provide all-round wrapping and fixation for the cable to cope with the scouring of water flow from different directions.

[0158] Application: The sand blanket not only covers the top of the submarine cable, but also extends to both sides, forming a "saddle-shaped" or "U-shaped" wrap, providing more comprehensive ballast and protection for the submarine cable.

[0159] Beneficial effects:

[0160] All-around fixation: This setup ensures that the submarine cable is not prone to lateral displacement or floating under the action of water currents, thus enhancing the fixation effect.

[0161] Synergistic effect: The sand on both sides can also connect better with the rigid gabion on the outside, forming a more stable overall structure and working together to resist erosion.

[0162] Beneficial effects:

[0163] All-around fixation: This setup ensures that the submarine cable is not prone to lateral displacement or floating under the action of water currents, thus enhancing the fixation effect.

[0164] Synergistic effect: The sand on both sides can also connect better with the rigid gabion on the outside, forming a more stable overall structure and working together to resist erosion.

[0165] The purpose and use of setting the protective sandbag to be filled with silt and sand with particle volume smaller than a preset threshold:

[0166] Purpose of the design: To select a suitable filler that provides sufficient ballast while ensuring the performance of the flexible material, and at the same time avoids negative environmental impacts.

[0167] Application: The internal filling material is the primary source of protection against the weight and ballast force of the sand sheet. Using small-particle sand ensures uniform internal filling and prevents uneven surfaces or localized stress concentrations caused by large particles.

[0168] Beneficial effects:

[0169] Uniform Ballast: Fine particles of filler can make the sand cover form a flatter and more uniform ballast on the surface of the submarine cable, avoiding damage to the submarine cable caused by excessive local pressure.

[0170] Construction convenience: Fine-grained silt is easier to fill and arrange underwater, simplifying the construction process.

[0171] Optionally, the rigid erosion protection structure is at least one set of protective gabions;

[0172] The protective gabions are symmetrically arranged on both sides of the protective sand cover along the direction perpendicular to the submarine cable.

[0173] The rigid scour protection structure consists of at least one set of protective gabions, and its purpose and function are as follows:

[0174] Purpose: To provide significant ballast weight to effectively resist the erosion of submarine cables by water currents. Traditional sandbags or bionic aquatic plants are ineffective at high flow rates, while gabions, with their heavy weight and stability, can fundamentally solve this problem.

[0175] Purpose: It serves as the main "ballast" of the entire protection system, relying on the gravel or crushed stone filling inside to provide a stable ballast force and prevent submarine cables from being suspended or displaced due to scouring.

[0176] Beneficial effects:

[0177] Providing strong ballast capacity: The rigid frame and internal filling of the gabion can provide a weight far greater than that of the flexible sand blanket, ensuring that the submarine cable remains stable in strong current environments.

[0178] Structural stability: Rigid gabion frames are not easily deformed and can maintain their shape and ballast effect for a long time.

[0179] The protective gabions are symmetrically arranged on both sides of the protective sand cover along the direction perpendicular to the submarine cable. Their purpose and function are as follows:

[0180] Purpose of the setup: To indirectly secure the submarine cable by applying its weight to the protective sand without directly contacting it. Simultaneously, the symmetrical arrangement balances the forces and prevents structural deflection.

[0181] Application: Gabions are placed on both sides of the submarine cable to form a U-shaped or trough-shaped protective frame. Flexible sand is located in the center of the frame, receiving the ballast force from the gabions on both sides, thus indirectly securing the submarine cable.

[0182] Beneficial effects:

[0183] Avoiding cable wear: By separating the rigid gabions from the flexible sand, the gabions provide ballast, while the sand provides close protection, perfectly solving the problem of wear caused by direct contact between traditional gabions and submarine cables.

[0184] Enhanced overall stability: Symmetrical arrangement makes the force on the protective device more balanced, effectively resisting the impact of water flow from different directions and preventing the device from moving laterally or overturning.

[0185] Optionally, the rigid erosion protection structure is a set of protective gabions;

[0186] Multiple sets of protective gabions are arranged and extended away from the submarine cable;

[0187] The protective sandbags and the protective gabions, as well as multiple sets of protective gabions, are connected by anchor chains.

[0188] The rigid scour protection structure consists of multiple sets of protective gabions, and its purpose and use are as follows:

[0189] Purpose of the setup: To increase the overall ballast weight while enabling modular and segmented layout to adapt to submarine cables of different lengths and complex construction environments.

[0190] Application: Multiple independent protective gabion modules are arranged in sections on both sides of the submarine cable. This method facilitates transportation and installation, and the protection length and range can be flexibly adjusted according to actual needs.

[0191] Beneficial effects:

[0192] High flexibility: The modular design allows the protective device to easily adapt to different submarine cable lengths and routes without the need for custom-made large single structures.

[0193] Construction convenience: Multiple small gabions are easier to lift and position underwater than a single large gabion, reducing construction difficulty and risk.

[0194] Reduced maintenance costs: When a module is damaged due to an accident, only the damaged part can be replaced, without the need for extensive repairs to the entire protective structure.

[0195] Multiple sets of protective gabions are arranged and extended away from the submarine cable. Their purpose and function are as follows:

[0196] Purpose of the setup: To expand the protection range and provide a wider area of ​​ballast and velocity reduction in the areas where submarine cable scouring is most severe (usually on both sides of the submarine cable).

[0197] Application: Multiple sets of gabions extend to both sides, forming a wider "protective zone." This design helps to disperse the scouring force of the water flow over a wider area, fundamentally reducing the impact on submarine cables.

[0198] Beneficial effects:

[0199] Expanding the protection area: Extended gabions can more effectively protect the seabed on both sides of the submarine cable, prevent scouring caused by lateral water flow, and enhance the anti-erosion effect.

[0200] Improved overall stability: Increased contact area and friction between the entire protective device and the seabed, making the device more difficult to be pushed or displaced by water flow.

[0201] The protective sandbags and the protective gabions, as well as multiple sets of protective gabions, are connected by anchor chains. The purpose and intended use of this connection are as follows:

[0202] Purpose of the design: To enable the entire system to cope with uneven seabed settlement while ensuring structural connectivity.

[0203] Application: Anchor chains are used as connectors to link individual modules together into a single unit. They provide sufficient tension to prevent modules from separating while allowing for limited relative displacement and angular adjustments between modules.

[0204] Beneficial effects:

[0205] Adapting to changes in terrain: When the seabed is uneven or subsidence occurs, the flexible anchor chain connection allows each module to "fight its own battle" and automatically adjust its position to adapt to the terrain, avoiding structural stress concentration and damage that may be caused by rigid connection.

[0206] Maintaining overall synergy: Although the modules can move relative to each other, the presence of anchor chains ensures that they work together as a whole. When one module is impacted, the force can be transmitted to adjacent modules through the anchor chains, working together to resist the external force.

[0207] Optionally, the protective gabion is constructed with a rigid truss frame and has a closed space formed by rigid mesh on the sides.

[0208] A rigid truss frame is a grid-like structure composed of straight members connected at their ends. These connections are typically hinged, forming one or more triangular units. Due to the stable geometric properties of triangles, when subjected to external loads, the members of this structure only bear axial forces of tension or compression, without bending deformation. This allows for high stiffness and load-bearing capacity with relatively low material consumption.

[0209] In gabions, the rigid truss frame refers to the core supporting framework. It is not a solid, heavy structure, but rather a mesh-like skeleton made of steel bars, metal rods, or high-strength composite materials. This skeleton provides strong structural support for the entire gabion, enabling it to:

[0210] Bearing the weight of the filling material: Ensure that the gabion will not deform or collapse due to its own weight after being filled with gravel or crushed stone.

[0211] Resisting external impacts: Maintaining the shape and integrity of the gabion under the action of external forces such as water flow, waves or seabed collisions.

[0212] Maintain a closed space: Provides stable support for the side mesh to ensure that the filling does not leak out.

[0213] In simple terms, a rigid truss frame is like the skeletal system of a gabion. It constructs a stable three-dimensional space in a lightweight yet robust manner, enabling the gabion to effectively perform its ballast and protective functions.

[0214] Composition of protective gabions:

[0215] Installation method: The protective gabion is made of a rigid truss frame, and its sides are made of rigid mesh to form a closed space.

[0216] Purpose of the installation: To ensure that the protective gabion can stably contain the internal filling material and maintain its geometric shape and structural integrity in the underwater environment for a long period of time.

[0217] use:

[0218] Rigid truss frame: Provides core structural support for the entire gabion, enabling it to withstand the enormous weight of the internal filling material (such as gravel or crushed stone) while resisting the impact of external water flow, preventing structural deformation or collapse.

[0219] Rigid mesh: It acts as a "container," firmly confining the internal filling material within the frame and preventing it from being washed away by water flow. At the same time, the mesh's porous design allows water to pass through, preventing the gabion from forming a large water-blocking surface under strong currents, thus reducing its impact on itself.

[0220] Beneficial effects:

[0221] Stable structure: The combination of rigid trusses and wire mesh gives gabions extremely high structural stability and compressive strength, enabling them to reliably provide ballast function over a long period of time.

[0222] No loss of filler: The rigid mesh ensures that the filler inside the gabion will not be washed away by the water flow, thus guaranteeing the durability of its ballast effect.

[0223] Fluid characteristics optimization: The permeable design of the mesh allows some water to flow through while providing ballast, reducing the frontal impact on the gabion itself and improving its overall erosion resistance.

[0224] Optionally, baffles are provided on the top of the protective sand blanket and the protective gabion;

[0225] The surface of the baffle is provided with a diversion structure for guiding water flow; the shape of the diversion structure is used to guide the water flow and cause siltation.

[0226] This alternative embodiment is highly innovative, transforming the protective device from passively bearing loads to actively utilizing water flow. The following is a detailed description of each part:

[0227] The protective sand blanket and the top of the protective gabion are equipped with baffles for the purpose and use of:

[0228] Purpose of the installation: To form a "barrier" on top of the protective device to slow down the water flow and create conditions for subsequent siltation.

[0229] Application: Similar to a groyne in hydraulic engineering, a baffle reduces the velocity of water flow in a region by blocking and diverting it. This deceleration effect is crucial for preventing seabed erosion.

[0230] Groynes are a common structure in water conservancy projects for erosion control and river channel stabilization. Their main functions can be summarized in the following three points:

[0231] Slowing down water flow: Groynes protrude from the bank and extend into the river channel. When water flows over a groyne, it changes direction, creating an obstruction on the upstream side and forming eddies on the downstream side. Both of these effects effectively reduce the water flow velocity in the area it passes through.

[0232] Guiding water flow: Groynes can forcibly change the main direction of water flow, diverting water that would otherwise erode the banks to the center of the river channel. This helps protect riverbanks and reduces slope erosion and collapse.

[0233] Promoting siltation: Due to the reduced water flow velocity and the formation of eddies, the silt carried by the water will settle on the backwater side of the groynes, especially in the downstream area, due to the slowed flow velocity, thus forming silt. This silt can gradually raise the riverbed, forming new floodplains, which not only stabilizes the river channel but also serves as bank protection.

[0234] Beneficial effects:

[0235] Reducing scouring force at the source: Instead of passively enduring the scouring of the water flow, it is better to actively reduce the energy of the water flow. The design of the baffle solves the scouring problem from a fluid dynamics perspective, fundamentally reducing the force acting on the submarine cable.

[0236] Promoting sediment deposition: When the water flow slows down, the sediment it carries will settle due to gravity. The presence of the baffle provides space for sediment to settle, forming a natural protective layer on top of and around the protective device, further enhancing the protective effect.

[0237] The baffle surface is provided with a diversion structure for guiding water flow. The shape of the diversion structure is designed to guide the water flow and cause sediment deposition. Purpose and use:

[0238] Purpose of the design: Through meticulous structural design, the baffle's control effect on water flow is optimized, enabling it to not only slow down the flow but also actively guide the water flow and sediment; by utilizing the energy of the water flow itself, the sediment in the water flow is used as "building material," adding a natural "armor" to the protective device.

[0239] Applications: Drainage structures can take various shapes, such as guide channels, guide holes, or special biomimetic curved surfaces. They can precisely change the direction of water flow, forcing it to flow along a predetermined path. The shape of the drainage structure is carefully designed (e.g., guide plates or holes with specific angles) to create a flow pattern that promotes sediment settling as water passes through. This design achieves "sand control," turning sediment in the water flow into a valuable resource.

[0240] Beneficial effects:

[0241] Precise water flow control: The diversion structure can prevent the water flow from forming chaotic turbulence or backflow at the baffle, and instead guide it to an area conducive to sediment deposition, thus improving sedimentation efficiency.

[0242] Improve the efficiency of scouring protection: By guiding the water flow, the lower water with high sediment content can be directed through a specific path to carry the sediment to the back of the protective device or a specific area for deposition, forming a thicker cover layer and strengthening the protection.

[0243] Adaptive Enhancement Protection: Over time, the sediment layer thickens, increasing the protective effect. This is a self-improving and self-reinforcing protection mechanism.

[0244] Eco-friendly: The sand layers formed by siltation can better integrate with the seabed environment, reducing disturbance to the marine ecosystem.

[0245] Optionally, a floating curtain is also provided on the top of the baffle;

[0246] The floating curtain is suspended in the water and connected to the baffle by anchor chains;

[0247] The floating curtain is used to further reduce the dynamic force of the water above the baffle.

[0248] The top of the baffle is also equipped with a floating curtain, the purpose and use of which are as follows:

[0249] Purpose of the design: To add a vertical, flexible water flow blocking structure to the existing baffle, extending the flow reduction effect from the seabed into the water body.

[0250] Application: The floating curtain acts like an "underwater curtain," extending upwards from the top of the baffle and suspended in the water. It can exert resistance on the upper water layer without directly contacting the seabed or submarine cables, thus reducing their kinetic energy.

[0251] Beneficial effects:

[0252] Three-dimensional flow reduction: Baffles primarily affect the flow velocity near the bottom, while floating curtains further reduce the kinetic energy of the upper water flow. This three-dimensional flow reduction method can more comprehensively reduce the flow velocity of the entire water body, thereby reducing the impact on the protective devices.

[0253] Promoting the settling of suspended sediment: The upper water layer usually carries a large amount of suspended sediment. The blocking effect of the floating curtain can slow down the flow rate of this suspended sediment, promote its faster settling to the seabed, provide more sediment for the protective device, and accelerate the formation of a natural protective layer.

[0254] The floating curtain is suspended in the water and connected to the baffle via anchor chains. Its purpose and function are as follows:

[0255] Purpose of setting: To ensure that the floating curtain can be stably suspended in the water and maintain an effective connection with the baffle.

[0256] Applications: The floating curtain itself has buoyancy, allowing it to maintain a certain water depth. Connected to baffles by anchor chains, its suspension range can be controlled, preventing it from drifting away with the current. The flexible connection of the anchor chains also allows the floating curtain to swing to a certain extent under wave action, absorbing some of the impact energy.

[0257] Beneficial effects:

[0258] Dynamic adaptability: The suspension and flexible connection of the floating curtain enable it to adapt to changes in sea tides and waves, avoiding structural damage caused by rigid fixation.

[0259] Easy to install and maintain: Floating structures are typically lightweight, and the anchor chain connection makes installation and future maintenance and inspection simpler.

[0260] The floating curtain further weakens the hydrodynamic forces above the baffle, working in conjunction with it to maximize the reduction of water flow velocity and kinetic energy. The presence of the floating curtain significantly enhances the fluid control capabilities of the entire protective device. Together with the baffle, it forms a "double deceleration barrier," comprehensively reducing the impact of water flow on the submarine cable from the seabed surface to the middle layer of the water. The synergistic work of the floating curtain and the baffle makes the system's anti-scouring and sedimentation effects far superior to those of a single structure. It not only protects the submarine cable but also utilizes the surrounding sediment to enhance the protective effect.

[0261] Optionally, anchor piles are provided at the bottom of the protective sand sheet and the protective gabion.

[0262] Purpose and intended use:

[0263] Purpose of the installation: To enhance the connection strength between the entire protective device and the seabed, and to prevent overall displacement, sliding or overturning under the action of strong water currents or waves.

[0264] Application: Anchor piles are components used to "nail" protective devices to the seabed. When protective sand sheets and gabions are placed on the seabed, their own weight or other auxiliary means can cause the pile tips at the bottom to penetrate the seabed soil, thereby providing strong vertical anchoring force.

[0265] Beneficial effects:

[0266] Enhancing overall stability: The friction and bearing capacity between the anchor piles and the seabed soil greatly improve the protective device's resistance to displacement in both horizontal and vertical directions. This fundamentally guarantees the stability of the protective device in extreme marine environments.

[0267] Preventing erosion: Although the above-mentioned solutions include deflectors and baffles to reduce erosion, localized erosion can still occur in certain extreme cases. The presence of anchor piles ensures that even if the seabed is partially eroded, the overall position of the protective device will not change, continuing to effectively protect the submarine cable.

[0268] Increased safety redundancy: Anchor piles provide additional safety for the entire system. They not only rely on the self-weight of the flexible sand sheet and rigid gabion, but also increase active anchoring force, making the protective effect more reliable.

[0269] Alternatively, to achieve the baffle's function of diverting water and promoting sediment deposition, the specific implementation method is as follows:

[0270] 1. Shape and angle optimization;

[0271] Inclined design: The diversion structure should be an inclined surface at a certain angle, forming an angle with the direction of water flow. This can convert part of the horizontally flowing water into a downward vertical force, accelerating the settling of the carried sediment.

[0272] Grooves or channeling channels: A series of grooves or channeling channels can be set on the surface of the baffle. These channels are designed to concentrate the water flow and create local deceleration zones within the channels, where sediment will settle more easily.

[0273] Bionic curved surfaces: Drawing inspiration from the streamlined shapes of objects in nature (such as fish and dolphins), bionic curved surface designs are employed. This design minimizes water flow resistance and guides water flow smoothly, while simultaneously creating low-velocity zones in specific areas, which are conducive to siltation.

[0274] 2. Pore and pore size design;

[0275] Drainage holes: A series of drainage holes should be installed on the baffle. These holes allow the high-sediment-laden water at the bottom to flow through, and due to the sudden decrease in flow velocity, the sediment will quickly accumulate behind the holes.

[0276] Differentiated orifice sizes: Orifice designs with larger diameters at the top and bottom, or larger diameters at the front and rear, can be used. Larger orifices at the top and front allow more water to pass through, while smaller orifices at the bottom and rear further slow down the flow velocity and improve sediment settling efficiency.

[0277] 3. Surface material and texture;

[0278] Rough surfaces: The surfaces of baffles and drainage structures can be textured. This roughness increases the friction between the water flow and the surface, further reducing the water flow velocity and accelerating sediment settling.

[0279] Attachment materials: Surface materials can be selected that facilitate the attachment of marine organisms. Attached algae or microbial communities will form a biofilm, increasing surface roughness and better capturing fine particles in the water flow, forming a biodeposition layer and enhancing long-term protective effects.

[0280] Optionally, the end protective gabion away from the submarine cable is equipped with a flow deflector.

[0281] The guide plate is supported and fixed below by a support truss;

[0282] The bottom side of the guide plate facing the water flow has a serrated structure.

[0283] The protective gabions at the ends of submarine cables, equipped with deflectors, are for the following purposes:

[0284] Purpose of this setup: To pre-treat the water flow before it enters the protected area, changing the flow pattern at the source, rather than passively protecting the cable after it has already reached it.

[0285] Application: The deflector is placed at the foremost end, facing the direction of the water flow. It acts like a "diverter," guiding the high-speed water flow near the seabed upwards, forcing it away from the seabed surface, thereby significantly reducing the scouring force on the seabed.

[0286] Beneficial effects:

[0287] Active scour reduction: This design shifts the focus of scour prevention forward, from passive resistance to active guidance and control of water flow, resulting in higher efficiency.

[0288] Protecting the entire protection system: The presence of the deflector not only protects the submarine cable, but also reduces the direct impact of water flow on the protective gabions and sand sheets, extending the service life of the entire device.

[0289] The guide plate is supported and fixed below by a support truss. Its purpose and function are as follows:

[0290] Purpose of setting: To ensure that the guide plate can maintain its preset tilt angle and position under the impact of strong water flow, without deformation or displacement.

[0291] Application: The support truss provides a stable base for the deflector. The structural characteristics of the truss enable it to withstand complex stresses from the deflector and safely transfer them to the seabed and anchoring system below.

[0292] Beneficial effects:

[0293] High structural stability: The truss structure provides lightweight and high-strength support, ensuring that the deflector can work continuously and effectively.

[0294] Optimized water flow: Stable support allows the guide plate to maintain the optimal angle of attack, thereby achieving the most ideal fluid guidance effect.

[0295] The bottom side of the guide plate facing the water flow has a serrated structure. Its purpose and function are as follows:

[0296] Purpose of the design: To enhance the friction and anchoring force between the guide vane and the seabed without increasing too much weight and volume.

[0297] Applications: The serrated structure, like "claws," can grip the seabed soil, increasing the contact area and reducing unevenness. When water flow attempts to push the guide plate, this structure can provide additional shear resistance, effectively resisting horizontal slippage.

[0298] Beneficial effects:

[0299] Enhanced anti-slip capability: Under the horizontal thrust of water flow, the serrated structure can provide greater frictional resistance than a flat bottom, greatly enhancing the device's anti-slip and anti-displacement capabilities.

[0300] Synergistic ballast effect: The serrated structure can also penetrate the seabed, forming a synergistic effect with the anchor piles, and jointly enhancing the anchoring stability of the entire device.

[0301] To enable those skilled in the art to better understand the embodiments of the present invention, an example is used below to illustrate the embodiments of the present invention.

[0302] like Figure 2 As shown, Figure 2 This is a schematic diagram of another structure for a submarine cable scour protection device provided in an embodiment of the present invention.

[0303] A submarine cable scour protection device mainly includes: a protective sand sheet 202, a protective gabion 203, an anchor chain 204, a guide plate 205, a baffle 206, a floating curtain 207, and an anchor pile 208.

[0304] At least one set of protective sand sheets 202, modularly arranged and made of flexible material, are filled with fine-grained mud and sand. They cover the submarine cable 201 and its surroundings along the direction perpendicular to the submarine cable 201, serving as ballast and fixing. The flexible material can prevent wear on the surface of the submarine cable 201.

[0305] At least one set of protective gabions 203 are modularly arranged and symmetrically arranged on both sides of the protective sand cover 202 along the direction of the vertical submarine cable 201 and extending away from the submarine cable 201. The gabions are made of rigid trusses to form a skeleton, and the sides are made of rigid mesh to form a closed space. The interior is filled with gravel or crushed stone to enhance the ballast effect by its own weight.

[0306] The protective sand sheet 202 and the protective gabion 203 are connected by anchor chains 204, allowing for a certain degree of relative displacement between each pair. In the event of uneven settlement, each protective gabion 203 can adjust to adapt to changes in the seabed topography.

[0307] The upper surfaces of the protective sand sheet 202 and the protective gabion 203 are equipped with baffles 206, which function similarly to the "groynes" in water conservancy projects. They can reduce the flow velocity of water and promote the accumulation of silt behind the dam, thereby forming a siltation layer on the protective sand sheet 202 and the protective gabion 203, and strengthening the scour protection of the submarine cable 201.

[0308] Above each baffle 206, a floating curtain 207 is also provided. The floating curtain 207 adopts a weather-resistant floating structure, which can be suspended in the water and is connected to the baffle 206 through the anchor chain 204. The floating curtain 207 can further reduce the dynamics of the water above and promote the retention of silt.

[0309] A flow guide plate 205 with flow guide holes is installed at the end furthest from the submarine cable 201. The flow guide plate 205 is supported and fixed below by a support truss. Its function is twofold: firstly, the flow guide plate 205 alters the water flow pattern, forcing it to rise and flow upwards away from the seabed, exchanging with the upper water to create turbulence and reduce velocity; the flow guide holes allow the lower layer of water with high sediment load to pass through, causing sediment to accumulate behind the holes. Secondly, the water flow acting on the flow guide plate 205 generates a downward force, which helps enhance the stability of the structure on the seabed. The bottom side of the flow guide plate 205 facing the water flow has a serrated structure, increasing the contact area with the seabed soil and effectively enhancing its stability on the seabed.

[0310] Anchor piles 208 are installed at the bottom of each protective sand sheet 202, protective gabion 203 and flow guide plate 205. The bottom of the anchor pile 208 is pointed. Under the action of the self-weight of the structure above, it can be submerged into the seabed, which enhances the overall anchoring force and stability of the structure.

[0311] By installing a protective sand sheet 202 near the submarine cable 201 and protective gabions 203 on both sides of the protective sand sheet 202 away from the submarine cable 201, wear on the submarine cable 201 can be prevented, while the weight of the protective gabions 203 enhances the ballast effect. The protective sand sheet 202 and the protective gabions 203 are connected by anchor chains 204 to ensure automatic adjustment to adapt to changes in seabed topography when the seabed settles unevenly. The structure of guide plates 205, baffles 206, and floating curtains 207 can effectively reduce hydrodynamic forces, promote siltation and the formation of a cover layer, and enhance the scour protection effect of the submarine cable 201. The anchor piles 208 can be submerged in the seabed under the weight of the protective sand sheet 202 and the protective gabions 203 and the action of water flow, enhancing the anchoring force of the structure in the seabed.

[0312] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0313] Finally, it should be noted that in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0314] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A submarine cable erosion protection device, characterized in that, The submarine cable scour protection device includes: Flexible erosion protection structure for wrapping submarine cables; A rigid erosion protection structure used to provide ballast gravity for the flexible erosion protection structure; A connecting member is provided between the flexible erosion protection structure and the rigid erosion protection structure to prevent them from separating.

2. The submarine cable erosion protection device according to claim 1, characterized in that, The connector is an adjustable connector; The submarine cable scour protection device includes: Flow rate and pressure sensors, and a data processing module; The flow velocity and pressure sensors are used to monitor water flow velocity and force data; The processing module is used to generate a deformation signal for the adjustable connector based on the water flow velocity and the force data. The adjustable connector is configured to adjust the gap width between the flexible erosion protection structure and the rigid erosion protection structure based on the deformation signal.

3. The submarine cable erosion protection device according to claim 1, characterized in that, The flexible erosion protection structure serves as a protective sand blanket. The protective sand is applied to the top and sides of the submarine cable in a direction perpendicular to the submarine cable. The protective sandbag is filled with mud and sand with particle volume smaller than a preset threshold.

4. The submarine cable erosion protection device according to claim 3, characterized in that, The rigid scour protection structure is at least one set of protective gabions; The protective gabions are symmetrically arranged on both sides of the protective sand cover along the direction perpendicular to the submarine cable.

5. The submarine cable erosion protection device according to claim 4, characterized in that, The rigid scour protection structure consists of multiple sets of protective gabions. Multiple sets of protective gabions are arranged and extended away from the submarine cable; The protective sandbags and the protective gabions, as well as multiple sets of protective gabions, are connected by anchor chains.

6. The submarine cable erosion protection device according to claim 4 or 5, characterized in that, The protective gabion has a rigid truss frame and a closed space on the sides formed by rigid mesh.

7. The submarine cable erosion protection device according to claim 6, characterized in that, The protective sand blanket and the top of the protective gabion are equipped with baffles; The surface of the baffle is provided with a diversion structure for guiding water flow; the shape of the diversion structure is used to guide the water flow and cause siltation.

8. The submarine cable erosion protection device according to claim 7, characterized in that, A floating curtain is also provided on the top of the baffle; The floating curtain is suspended in the water and connected to the baffle by anchor chains; The floating curtain is used to further reduce the dynamic force of the water above the baffle.

9. The submarine cable erosion protection device according to claim 6, characterized in that, The protective sandbag and the bottom of the protective gabion are equipped with anchor piles.

10. The submarine cable erosion protection device according to claim 5, characterized in that, The protective gabion at the end of the cable, far from the submarine cable, is equipped with a flow deflector. The guide plate is supported and fixed below by a support truss; The bottom side of the guide plate facing the water flow has a serrated structure.

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