Ship mooring method

Abstract

To provide a ship mooring method that can reduce mooring costs by appropriately performing ship mooring procedures. [Solution] The system includes a judgment step S01 for determining whether or not to observe the undersea portion 20M or the submarine cable C of the offshore wind turbine foundation 20 that supports the offshore wind turbine 10; a mooring line mooring step S02 for mooring the ship B by looping a mooring line R around the offshore wind turbine foundation 20 if it is determined in judgment step S01 that the undersea portion 20M or the submarine cable C will be observed; and a contact mooring step S03 for mooring the ship B by contacting it with the offshore wind turbine foundation 20 if it is determined in judgment step S01 that the undersea portion 20M or the submarine cable C will not be observed.

Description

[Technical Field]

[0001] The present disclosure relates to a method for mooring a vessel. [Background technology]

[0002] BACKGROUND ART Conventionally, in offshore wind power generation, when various maintenance works are carried out, a vessel such as a work boat is moored to an offshore wind turbine foundation that supports the offshore wind turbine. Patent document 1 discloses a mooring line positioned to moor a wind turbine, and an anchor handling vessel positioned to pull the chain, which tensions the mooring line. Patent Document 2 discloses that a gripping portion of a work vessel for installing or maintaining a floating structure is engaged with a flange portion of the floating structure in a floating state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2023-531712 [Patent Document 2] International Publication No. 2012 / 011601 Summary of the Invention [Problem to be solved by the invention]

[0004] However, Patent Document 1 and Patent Document 2 leave room for improvement in terms of the procedures for mooring ships, etc.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a ship mooring method that can appropriately perform ship mooring procedures and reduce mooring costs. [Means for solving the problem]

[0006] A method for mooring a vessel according to one aspect of the present disclosure is characterized by comprising a determination step of determining whether or not to observe the subsea portion of the offshore wind turbine foundation supporting the offshore wind turbine or the submarine cable, and a mooring line mooring step of mooring the vessel by looping a mooring line around the offshore wind turbine foundation depending on the result of the determination step.

[0007] A vessel mooring method according to one aspect of the present disclosure is characterized by comprising: a determination step of determining whether or not to observe a subsea portion or submarine cable of an offshore wind turbine foundation supporting an offshore wind turbine; a mooring line mooring step of mooring the vessel by looping a mooring line around the offshore wind turbine foundation if it is determined in the determination step that the subsea portion or the subsea cable will be observed; and a contact mooring step of mooring the vessel by contacting it with the offshore wind turbine foundation if it is determined in the determination step that the subsea portion or the subsea cable will not be observed.

[0008] A vessel mooring method according to one aspect of the present disclosure is characterized by comprising: a determination step of determining whether to observe a subsea portion or submarine cable of an offshore wind turbine foundation supporting an offshore wind turbine, or to moor the vessel by contacting it with the offshore wind turbine foundation; a mooring line mooring step of looping a mooring line around the offshore wind turbine foundation to moor the vessel if it is determined in the determination step that the subsea portion or the subsea cable will be observed; and a contact mooring step of contacting it with the offshore wind turbine foundation to moor the vessel if it is determined in the determination step that the vessel will be moored by contacting it with the offshore wind turbine foundation. [Effects of the Invention]

[0009] According to the present disclosure, a method for mooring a vessel can be provided that improves the efficiency of mooring work and reduces costs by properly performing procedures for mooring a vessel. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing an offshore wind turbine 10 that is the target of a ship mooring method according to the present disclosure. [Figure 2]FIG. 2 is a diagram showing an offshore wind turbine foundation 20 of the offshore wind turbine 10. [Figure 3] 1 is a diagram showing a vessel B that is the subject of a vessel mooring method according to the present disclosure. [Figure 4] FIG. 2 is a flowchart illustrating a method for mooring a vessel according to the embodiment. [Figure 5] FIG. 10 is a diagram showing an example of a mooring rope mooring step S02. [Figure 6] FIG. 2 is a diagram showing a jacket-type offshore wind turbine foundation 25. [Figure 7] FIG. 2 is a diagram showing a floating offshore wind turbine foundation 28. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a method for mooring a vessel according to an embodiment of the present disclosure will be described with reference to the drawings. A ship mooring method according to an embodiment is a ship mooring method for mooring a ship to an offshore wind turbine. For example, a single offshore wind turbine may be installed in the same sea area or wind farm, or multiple offshore wind turbines may be installed. When multiple offshore wind turbines are installed, adjacent offshore wind turbines may be connected by submarine cables, for example, to exchange the electricity they generate with each other.

[0012] (Outline of 10 offshore wind turbines) FIG. 1 is a perspective view of a first example of an offshore wind turbine 10 that is the target of a vessel mooring method according to the present disclosure. 1, an offshore wind turbine 10 is placed on the ocean. The offshore wind turbine 10 includes a plurality of blades 11, a hub 12, a nacelle 13, and a tower 14. The multiple blades 11 are attached to a hub 12. When the multiple blades 11 receive wind, they rotate around the hub 12. The nacelle 13 is provided at the top end of a tower 14. A generator (not shown) is provided inside the nacelle 13. The offshore wind turbine 10 generates electricity by transmitting the rotation of the blades 11 to the generator. The electricity generated by the offshore wind turbine 10 is transmitted to another offshore wind turbine 10 or to a land-based power plant via an undersea cable C connected to the offshore wind turbine 10. The submarine cable C is connected to the power generation facility and is drawn out from the offshore wind turbine foundation 20 to the seabed.

[0013] The offshore wind turbine 10 is supported by an offshore wind turbine foundation 20. The offshore wind turbine foundation 20 is a marine structure that supports the offshore wind turbine 10. For the offshore wind turbine foundation 20, for example, a known configuration is suitably used. The offshore wind turbine foundation 20 is suitably any one of a monopile foundation (see FIG. 1), a jacket foundation (see FIG. 6), and a floating foundation (see FIG. 7), for example.

[0014] In this embodiment, the offshore wind turbine foundation 20 is a monopile foundation. That is, the offshore wind turbine foundation 20 is formed by installing a monopile 20M, which is a bottom-fixed foundation, in the seabed. The tower 14 and the monopile 20M are connected by a transition piece 21. The 20m monopile (subsea section) is exposed to seawater and is therefore subject to regular and special maintenance.

[0015] FIG. 2 is a diagram showing the offshore wind turbine foundation 20 of the offshore wind turbine 10. As shown in FIG. A boat landing 16 and an external work platform 17 are installed on the transition piece 21 of the offshore wind turbine foundation 20. The boat landing 16 is a ladder-shaped structure that allows a vessel B, such as a work boat, to dock on the offshore wind turbine 10 during maintenance of the offshore wind turbine 10. The vessel B is pushed against this boat landing 16 to dock.

[0016] The external work platform 17 is a floor-like structure on which workers can perform work, and is located above the boat landing 16. The external work platform 17 serves as a base where workers can perform various tasks and collect necessary materials when performing maintenance on the outside of the offshore wind turbine 10.

[0017] The vessel B may be, for example, a CTV (Crew Transfer Vessel). A CTV is a small, high-speed vessel that is used particularly for the construction and maintenance of offshore wind power plants. The CTV is designed to safely transport workers and engineers to the offshore wind turbine foundation 20 of the offshore wind turbine 10. The CTV has a structure that allows it to approach the offshore wind turbine foundation 20 and press its bow against (contact with) the boat landing 16. The ship B is equipped with a ship computer system (not shown), which performs overall control of the ship B. The ship computer system may also execute a ship mooring method (a ship mooring computer program) according to the embodiment and supervise the work of workers.

[0018] (Vessel mooring method) FIG. 4 is a flowchart illustrating a method for mooring a vessel according to the embodiment. Because the offshore wind turbine 10 is exposed to seawater, various maintenance works are performed on it periodically or temporarily. During the various maintenance works, it is necessary to moor a vessel B such as a work boat to the offshore wind turbine 10.

[0019] The procedure of a ship mooring method for mooring a ship B such as a work ship to the offshore wind turbine 10 will be described with reference to FIG. First, in decision step S01, it is determined whether to observe the monopile 20M or the submarine cable C of the offshore wind turbine foundation 20 that supports the offshore wind turbine 10. In this decision step S01, it is determined whether to observe the monopile 20M or the submarine cable C of the offshore wind turbine foundation 20 that supports the offshore wind turbine 10, or whether to moor the ship B by bringing it into contact with the offshore wind turbine foundation 20.

[0020] Depending on the result of this determination step S01, the process proceeds to either the mooring line mooring step S02 or the contact mooring step S03. That is, if it is determined in the determination step S01 that the monopile 20M or the submarine cable C is observed, the process proceeds to the mooring line mooring step S02. On the other hand, if it is determined in the determination step S01 that the monopile 20M or the submarine cable C is not observed, the process proceeds to the contact mooring step S03.

[0021] The decision as to whether to proceed to the mooring line mooring step S02 or to the contact mooring step S03 takes into consideration the type and number of offshore wind turbines 10 (offshore wind turbine foundations 20), the type of maintenance, priority, urgency, work time, etc. For example, if the priority or urgency of maintenance of the submarine cable C is high, it is decided to proceed to the mooring line mooring step S02. On the other hand, if work on the external work platform 17 has priority, it is decided to proceed to the contact mooring step S03. Furthermore, the type of vessel B, remaining fuel, number of workers, work costs, etc. are also taken into consideration. For example, if there are many workers, parallel work can be carried out to improve efficiency. Specifically, first, in the contact mooring step S03, the workers on the external work platform 17 are moved, and then the process moves to the mooring rope mooring step S02 to observe the monopile 20M or the submarine cable C.

[0022] Next, in a mooring rope mooring step S02, a mooring rope R is looped around the offshore wind turbine foundation 20 to moor the ship B. In the mooring rope mooring step S02, the monopile 20M and the submarine cable C are observed while the ship B is moored with the mooring rope R wound in a loop around the offshore wind turbine foundation 20. The observation of the monopile 20M and the submarine cable C is performed by an ROV (Remotely Operated Vehicle). The ROV is a type of unmanned underwater robot that operates by remote control underwater, and is connected to the ship B via a cable. In other words, Vessel B is a vessel used for ROV operations, and the operator on board Vessel B operates the ROV deployed in the sea while checking the camera footage and sensor information transmitted from the ROV on board. The ROV will then be used to observe the monopile 20M and submarine cable C, and by using the camera images and sensor information obtained from the ROV, it will be possible to determine whether or not maintenance is required for the monopile 20M and submarine cable C.

[0023] FIG. 5 is a diagram showing an example of the mooring rope mooring step S02. The mooring rope R is attached so as to surround the monopile 20M in a loop shape, for example. In the mooring rope mooring step S02, the mooring rope R is attached to the offshore wind turbine foundation 20 while being wound around the monopile 20M. As shown in Figure 5, the ship B holding the mooring rope R supports one end of the mooring rope R, and with a buoy or the like attached to the other end of the mooring rope R and thrown into the sea, circles around the offshore wind turbine foundation 20. The ship B then retrieves the buoy again and supports the other end of the mooring rope R (winding step S02M). As a result, the mooring rope R is wound around the monopile 20M and attached to the offshore wind turbine foundation 20. Therefore, the ship B is moored to the offshore wind turbine foundation 20 with the mooring rope R looped around it. This winding step S02M is particularly effective when the offshore wind turbine foundation 20 is a monopile foundation. That is, the winding step S02M is preferably used as a method for attaching the mooring rope R to the monopile 20M. In addition, when the offshore wind turbine foundation 20 is a jacket-type foundation, the mooring rope R may be attached so as to surround the leg 27 in a loop shape. Also, an ROV may be used in the winding step S02M. That is, with one end of the mooring rope R supported by the vessel B and the other end supported by the ROV, the ROV is operated to circle the monopile 20M and the leg 27. Thereafter, by retrieving the other end of the mooring rope R from the ROV, the mooring rope R can be attached so as to surround the monopile 20M and the leg 27.

[0024] In the mooring rope mooring step S02, the tension of the mooring rope R is adjusted. The tension of the mooring rope R is monitored using, for example, a load cell, and if a force greater than a set value is applied, the mooring rope is released, thereby adjusting the tension so that excessive tension is not applied to the offshore wind turbine foundation 2. By adjusting the tension of the mooring rope R in this way, the ship B can be reliably and stably moored to the offshore wind turbine foundation 20 without damaging the offshore wind turbine foundation 20.

[0025] Next, in contact mooring step S03, vessel B is brought into contact with and moored to the offshore wind turbine foundation 20. In contact mooring step S03, vessel B is maintained in a state where it is pressed against the boat landing 16 of the offshore wind turbine foundation 20. In other words, vessel B is positioned relative to the offshore wind turbine foundation 20. Then, workers on board vessel B transfer from vessel B to the boat landing 16 and move to the external work platform 17 to perform various maintenance work. In other words, vessel B is a vessel used for work on the offshore wind turbine foundation 20. Instead of or in addition to the method of pressing the vessel B against the boat landing 16, the vessel B may be positioned relative to the offshore wind turbine foundation 20 using a dynamic positioning system of the vessel B. In the contact mooring step S03, it is necessary to keep the power of the vessel B running in order to position the vessel B relative to the offshore wind turbine foundation 20. For this reason, it is required to minimize the mooring time of the vessel B in the contact mooring step S03.

[0026] In the re-determination step S04, it is determined whether or not to perform the contact mooring step S03 following the mooring line mooring step S02, or whether or not to perform the mooring line mooring step S02 following the contact mooring step S03. That is, when the mooring line mooring step S02 has been completed, it is determined in the re-determination step S04 whether or not to perform the contact mooring step S03. Alternatively, when the contact mooring step S03 has been completed, it is determined in the re-determination step S04 whether or not to perform the mooring line mooring step S02. In the re-determination step S04, it may be determined that only the mooring line mooring step S02 is performed and the vessel mooring method is terminated without performing the contact mooring step S03. Alternatively, it may be determined that only the contact mooring step S03 is performed and the vessel mooring method is terminated without performing the mooring line mooring step S02.

[0027] If it is determined in the re-determination step S04 that the contact mooring step S03 is to be performed following the mooring line mooring step S02, the process proceeds to the contact mooring step S03. On the other hand, if it is determined in the re-determination step S04 that the mooring line mooring step S02 is to be performed following the contact mooring step S03, the process proceeds to the mooring line mooring step S02. In addition, if it is determined that only the mooring line mooring step S02 is to be performed and not the contact mooring step S03, or if it is determined that only the contact mooring step S03 is to be performed and not the mooring line mooring step S02, the ship mooring method is terminated.

[0028] As explained above, in the ship mooring method of this embodiment, it is determined whether or not to observe the monopile 20M or the submarine cable C of the offshore wind turbine foundation 20 that supports the offshore wind turbine 10, so that the ship B can be appropriately moored to the offshore wind turbine foundation 20 with the mooring rope R. In particular, it is possible to appropriately choose between mooring the ship B with the mooring rope R or mooring the ship B by contacting it with the offshore wind turbine foundation 20. Therefore, it is possible to provide a ship mooring method that improves the efficiency of mooring work and reduces costs.

[0029] For example, the contact mooring step S03 is performed after the mooring line mooring step S02. In other words, the mooring line mooring step S02 is performed before (before) the contact mooring step S03. Also, for example, the contact mooring step S03 is performed before (before) the mooring line mooring step S02. In other words, the mooring line mooring step S02 is performed after the contact mooring step S03. In this way, mooring costs can be reduced by appropriately performing the mooring procedure for the vessel B. Therefore, the monopile 20M of the offshore wind turbine foundation 20 or the submarine cable C can be observed using the vessel B stably and with low fuel consumption.

[0030] FIG. 6 is a diagram showing a jacket-type offshore wind turbine foundation 25. As described above, the offshore wind turbine foundation 20 may be a jacket-type offshore wind turbine foundation 25 shown in Fig. 6. The jacket-type offshore wind turbine foundation 25 includes at least a transition piece 26 to which the lower end of the tower 14 of the offshore wind turbine 10 is connected and which supports the tower 14 of the offshore wind turbine 10, and a leg 27 which supports this transition piece 26. In the mooring rope mooring step S02, the mooring rope R may be attached to the leg 27.

[0031] FIG. 7 is a diagram showing a floating offshore wind turbine foundation 28. As described above, the offshore wind turbine foundation 20 may be a floating offshore wind turbine foundation 28 shown in Fig. 7. The offshore wind turbine foundation 28 is configured by supporting a float 29 floating on the sea with a wire W connected to the seabed. The wire W may be a chain or a fiber rope. The tower 14 is connected to the float 29 and is supported on the sea by the buoyancy acting on the float 29. The floating offshore wind turbine foundation 28 may be any of a barge type, semi-submersible type, spar type, TLP type, etc.

[0032] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0033] For example, the type of the offshore wind turbine 20 is not limited to a horizontal axis type, but may also be a vertical axis type. For example, the vessel B is not limited to a CTV, and may be any type of vessel (work vessel, access vessel). The vessel B may be any vessel that can be moored to the offshore wind turbine 10. For example, an AI-equipped ROV may be used instead of or in addition to an ROV remotely operated by an operator to observe the 20M monopile and the submarine cable C. Because observation of the 20M monopile and the submarine cable C is not dependent on the skill of the operator, efficient observation becomes possible, and maintenance costs can be reduced.

[0034] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0035] The ship mooring method according to the embodiment can be understood, for example, as follows. (Addendum) (1) Aspect 1 of the present disclosure is a method for mooring a vessel, characterized by comprising a determination step of determining whether or not to observe the undersea portion of the offshore wind turbine foundation supporting the offshore wind turbine or the submarine cable, and a mooring line mooring step of mooring the vessel by looping a mooring line around the offshore wind turbine foundation depending on the result of the determination step. This disclosure determines whether to observe the submarine cable or the subsea portion of the offshore wind turbine foundation that supports the offshore wind turbine, so that the vessel can be appropriately moored to the offshore wind turbine foundation with mooring lines. In other words, by appropriately performing the vessel mooring procedure, mooring costs can be reduced. Therefore, the subsea portion of the offshore wind turbine foundation or the subsea cable can be observed using the vessel stably and with low fuel consumption.

[0036] (2) Aspect 2 of the present disclosure is a method for mooring a vessel, comprising: a determination step of determining whether or not to observe a subsea portion or submarine cable of an offshore wind turbine foundation supporting an offshore wind turbine; a mooring line mooring step of mooring the vessel by looping a mooring line around the offshore wind turbine foundation if it is determined in the determination step that the subsea portion or the subsea cable will be observed; and a contact mooring step of mooring the vessel by contacting it with the offshore wind turbine foundation if it is determined in the determination step that the subsea portion or the subsea cable will not be observed. In this disclosure, depending on whether or not the undersea area or submarine cables are to be observed, it is possible to appropriately moor the vessel with mooring lines or by mooring the vessel in contact with the offshore wind turbine foundation.

[0037] (3) Aspect 3 of the present disclosure is a vessel mooring method comprising: a determination step of determining whether to observe the subsea portion or submarine cable of an offshore wind turbine foundation supporting an offshore wind turbine, or to moor the vessel by contacting it with the offshore wind turbine foundation; a mooring line mooring step of looping a mooring line around the offshore wind turbine foundation to moor the vessel if it is determined in the determination step that the subsea portion or the subsea cable will be observed; and a contact mooring step of contacting it with the offshore wind turbine foundation to moor the vessel if it is determined in the determination step that the vessel will be moored by contacting it with the offshore wind turbine foundation. In this disclosure, depending on whether the undersea area or submarine cables are to be observed, or whether the vessel is to be moored in contact with the offshore wind turbine foundation, it is possible to appropriately choose between mooring the vessel with mooring lines or mooring the vessel in contact with the offshore wind turbine foundation.

[0038] (4) Aspect 4 of the present disclosure may be a vessel mooring method described in (2) or (3), characterized in that the vessel moored in the mooring line mooring step is used for work by an ROV, and the vessel moored in the contact mooring step is used for work on the offshore wind turbine foundation. In this disclosure, when a vessel is used for work using an ROV, the vessel is moored with mooring lines, which reduces fuel consumption. Also, when a vessel is used for work on an offshore wind turbine foundation, the vessel is brought into contact with the offshore wind turbine foundation, which makes it easy for workers to move from the vessel to the offshore wind turbine foundation.

[0039] (5) Aspect 5 of the present disclosure may be a method of mooring a vessel described in any one of (2) to (4), characterized in that the contact mooring step is performed after the mooring line mooring step. In this disclosure, when the priority or urgency of observing the undersea area or the submarine cable is high, the mooring line mooring step is performed before the contact mooring step, thereby enabling appropriate maintenance to be carried out.

[0040] (6) Aspect 6 of the present disclosure may be a method of mooring a vessel described in any one of (2) to (4), characterized in that the contact mooring step is performed before the mooring line mooring step. In this disclosure, when the priority or urgency of maintenance work on an external work platform or the like is high, appropriate maintenance can be carried out by performing the contact mooring step before the mooring line mooring step.

[0041] (7) Aspect 7 of the present disclosure may be a method of mooring a vessel described in any one of (1) to (6), characterized in that the mooring rope is attached to the offshore wind turbine foundation by being wound around the offshore wind turbine foundation. This disclosure allows the mooring ropes to be securely attached to the offshore wind turbine foundation.

[0042] (8) Aspect 8 of the present disclosure may be a method of mooring a vessel described in any one of (1) to (7), characterized in that the vessel supports one end of the mooring line and throws the other end into the sea, and then circles around the offshore wind turbine foundation to retrieve the other end, thereby winding the mooring line around the offshore wind turbine foundation. In this disclosure, when the offshore wind turbine foundation is a monopile type, a ship can be used to wind mooring ropes around the offshore wind turbine foundation.

[0043] (9) A ninth aspect of the present disclosure may be a method of mooring a vessel described in any one of (1) to (8), characterized in that the observation of the underwater area or the submarine cable is performed by an ROV. In this disclosure, observation of the underwater area or submarine cables can be performed using an ROV, enabling underwater observation activities to be carried out safely and efficiently.

[0044] (10) A tenth aspect of the present disclosure may be the ship mooring method according to any one of (1) to (9), characterized in that the offshore wind turbine foundation is a bottom-fixed foundation. In this disclosure, the mooring method can be appropriately implemented regardless of whether the offshore wind turbine foundation is a monopile type or a jacket type.

[0045] (11) An eleventh aspect of the present disclosure may be the ship mooring method according to any one of (1) to (9), characterized in that the offshore wind turbine foundation is a floating foundation. In this disclosure, even if the offshore wind turbine foundation is a floating foundation such as a semi-submersible type, a spar type, a barge type, or a TLP type, the mooring method can be appropriately implemented.

[0046] (12) Aspect 12 of the present disclosure may be a method of mooring a vessel described in any one of (1) to (11), characterized in that the tension of the mooring rope is adjusted in the mooring rope mooring step. In this disclosure, the tension of the mooring rope is adjusted in the mooring rope mooring step, so that the ship can be appropriately moored to the offshore wind turbine foundation with the mooring rope. [Explanation of symbols]

[0047] 10 Offshore wind turbines 14. Tower 16 Boat Landing 17 External work floor 20 Offshore wind turbine foundations 20M monopile (mid-sea) 25 Jacket-type offshore wind turbine foundation 27th Leg 28 Floating Offshore Wind Turbine Foundation C. Submarine cable B Ship R mooring line

Claims

1. a determination step of determining whether to observe a submarine cable or a subsea portion of an offshore wind turbine foundation that supports the offshore wind turbine; a mooring rope mooring step of mooring a ship by looping a mooring rope around the offshore wind turbine foundation according to a result of the determination step; A method for mooring a vessel, comprising:

2. a determination step of determining whether to observe a submarine cable or a subsea portion of an offshore wind turbine foundation that supports the offshore wind turbine; a mooring rope mooring step of mooring a ship by looping a mooring rope around the offshore wind turbine foundation when it is determined in the determining step that the undersea portion or the submarine cable has been observed; a contact mooring step of contacting the ship with the offshore wind turbine foundation and mooring it when it is determined in the determination step that the undersea portion or the submarine cable will not be observed; A method for mooring a vessel, comprising:

3. a determination step of determining whether to observe a subsea portion of an offshore wind turbine foundation supporting the offshore wind turbine or a submarine cable, or whether to contact and moor a ship to the offshore wind turbine foundation; a mooring rope mooring step of mooring the vessel by looping a mooring rope around the offshore wind turbine foundation when it is determined in the determining step that the undersea portion or the submarine cable has been observed; a contact mooring step of mooring the vessel in contact with the offshore wind turbine foundation when it is determined in the determination step that the vessel will be moored in contact with the offshore wind turbine foundation; A method for mooring a vessel, comprising:

4. the ship moored in the mooring line mooring step is used for work by an ROV, 3. The vessel mooring method according to claim 2, wherein the vessel moored in the contact mooring step is used for work on the offshore wind turbine foundation.

5. 5. The method for mooring a vessel according to claim 4, wherein the contact mooring step is performed after the mooring line mooring step.

6. 5. The method for mooring a vessel according to claim 4, wherein the contact mooring step is performed before the mooring line mooring step.

7. 2. The method for mooring a vessel according to claim 1, wherein the mooring rope is attached to the offshore wind turbine foundation by being wound around the offshore wind turbine foundation.

8. 8. The method for mooring a vessel according to claim 7, further comprising a winding step in which the vessel supports one end of the mooring rope and throws the other end into the sea, and then circles around the offshore wind turbine foundation to retrieve the other end, thereby winding the mooring rope around the offshore wind turbine foundation.

9. 2. The method for mooring a vessel according to claim 1, wherein the observation of the undersea area or the submarine cable is carried out by an ROV.

10. 2. The method for mooring a vessel according to claim 1, wherein the offshore wind turbine foundation is a bottom-fixed foundation.

11. 2. The method for mooring a vessel according to claim 1, wherein the offshore wind turbine foundation is a floating foundation.

12. 2. The method for mooring a vessel according to claim 1, wherein the tension of the mooring rope is adjusted in the mooring rope mooring step.

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