Seaside sediment model construction method and device and medium
By acquiring coastal environmental data to calculate the shear stress and critical shear stress of the seabed, a seabed deformation model was constructed, which solved the construction difficulties caused by the complex changes in the seabed in offshore wind power projects, and achieved accurate prediction of seabed elevation and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-03-24
Smart Images
Figure CN121723897A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of coastal sediment movement technology, and specifically relates to a method, device and medium for constructing a coastal sediment model. Background Technology
[0002] As the global energy structure accelerates its transition to clean and low-carbon energy, offshore wind power, as one of the most promising forms of renewable energy for large-scale development, is experiencing a global development boom. However, during the implementation of current offshore wind power projects, especially in the installation of wind power equipment along the coast, the complexity of nearshore waters causes the seabed to constantly change. These changes affect the construction of wind power projects, as well as the safety and daily maintenance of subsequent projects. Relying on routine surveys to monitor the seabed elevation in real time, and using manual measurement, is time-consuming, labor-intensive, and wastes a significant amount of resources.
[0003] Therefore, a method is needed to predict the height of the seabed using coastal environmental data. Summary of the Invention
[0004] To address the above problems, this invention proposes a method for constructing a seaside sediment model, comprising the following steps: Obtain initial coastal environmental data; The shallow water model and seabed shear stress were obtained based on the initial coastal environmental data. Obtain the critical shear stress, and determine the sediment movement state based on the shear stress on the seabed and the critical shear stress. Construct a subsoil deformation model and obtain the subsoil elevation based on the sediment movement state and the subsoil deformation model.
[0005] Furthermore, the initial coastal environmental data includes surface wind stress and bed bottom shear stress vectors, water density, wave radiation stress tensor, Coriolis parameters, and horizontal eddy viscosity coefficient.
[0006] Furthermore, the formula for calculating the shear stress on the seabed surface is as follows:
[0007] in, Shear stress caused by tidal current. This represents the maximum shear stress caused by the waves. and These are nonlinear interaction coefficients.
[0008] Furthermore, obtaining the critical shear stress and determining the sediment movement state based on the seabed shear stress and the critical shear stress includes the following steps: Obtain the critical shear stress; if the critical shear stress is less than the shear stress on the seabed, sediment will be deposited. If the critical shear stress is greater than the shear stress on the seabed, then the seabed will erode.
[0009] Furthermore, the formula for calculating sediment deposition is as follows: , in, The critical shear stress for deposition. For rapid flocculation and sedimentation, This is near-bottom concentration. This represents the shear stress on the seabed surface.
[0010] Furthermore, the formula for calculating bed erosion is as follows: , in, The critical shear stress for erosion; denoted as shear stress on the seabed; M is the erosion rate coefficient.
[0011] A device for constructing a model of seaside mud and sand, comprising, Acquisition device to acquire initial coastal environmental data; based on the initial coastal environmental data, acquire shallow water model and seabed shear stress. The device is used to determine the critical shear stress and to judge the sediment movement state based on the shear stress on the seabed and the critical shear stress. The computing device constructs a bed deformation model and obtains the bed elevation based on the sediment movement state and the bed deformation model.
[0012] Furthermore, the formula for calculating the shear stress on the seabed surface is as follows:
[0013] in, Shear stress caused by tidal current. This represents the maximum shear stress caused by the waves. and These are nonlinear interaction coefficients.
[0014] Furthermore, the determination device acquires the critical shear stress, and the determination of the sediment movement state based on the seabed shear stress and the critical shear stress includes the following steps: Obtain the critical shear stress; if the critical shear stress is less than the shear stress on the seabed, sediment will be deposited. If the critical shear stress is greater than the shear stress on the seabed, then the seabed will erode.
[0015] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described above.
[0016] Beneficial effects of this invention: 1. The seaside sediment model construction method of the present invention includes acquiring initial seaside environmental data; acquiring a shallow water model and seabed shear stress based on the initial seaside environmental data; acquiring critical shear stress; determining the sediment movement state based on the seabed shear stress and critical shear stress; constructing a seabed deformation model; and acquiring the seabed elevation based on the sediment movement state and the seabed deformation model. Through the above steps, the elevation of the seabed can be predicted in real time, thereby making the prediction results more accurate and reducing costs.
[0017] 2. The seabed sediment model construction method of the present invention obtains the critical shear stress. If the critical shear stress is less than the shear stress of the seabed surface, sediment deposition occurs; if the critical shear stress is greater than the shear stress of the seabed surface, seabed erosion occurs. By making the above judgment, the elevation of the seabed is determined, thereby improving the accuracy of the judgment.
[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A flowchart illustrating the seaside sediment model construction method in an embodiment of the present invention is shown.
[0021] Figure 2 A schematic diagram of the process of constructing a seaside mud and sand model in an embodiment of the present invention is shown. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Example 1 refer to Figure 1 A method for constructing a seaside sediment model includes the following steps: Obtain initial coastal environmental data; The shallow water model and seabed shear stress were obtained based on the initial coastal environmental data. Obtain the critical shear stress, and determine the sediment movement state based on the shear stress on the seabed and the critical shear stress. Construct a subsoil deformation model and obtain the subsoil elevation based on the sediment movement state and the subsoil deformation model.
[0024] Furthermore, the initial coastal environmental data includes surface wind stress and bed bottom shear stress vectors, water density, wave radiation stress tensor, Coriolis parameters, and horizontal eddy viscosity coefficient.
[0025] Furthermore, the formula for calculating the shear stress on the seabed surface is as follows:
[0026] in, Shear stress caused by tidal current. This represents the maximum shear stress caused by the waves. and These are nonlinear interaction coefficients.
[0027] Furthermore, obtaining the critical shear stress and determining the sediment movement state based on the seabed shear stress and the critical shear stress includes the following steps: Obtain the critical shear stress; if the critical shear stress is less than the shear stress on the seabed, sediment will be deposited. If the critical shear stress is greater than the shear stress on the seabed, then the seabed will erode.
[0028] Furthermore, the formula for calculating sediment deposition is as follows: , in, The critical shear stress for deposition. For rapid flocculation and sedimentation, This is near-bottom concentration. This represents the shear stress on the seabed surface.
[0029] The formula for calculating bed erosion is as follows: , in, The critical shear stress for erosion; denoted as shear stress on the seabed; M is the erosion rate coefficient.
[0030] Example 2 Acquire initial coastal environmental data, including but not limited to sea surface wind stress and seabed shear stress vectors, water density, wave radiation stress tensor, Coriolis parameters, and horizontal eddy viscosity coefficient.
[0031] A shallow water model of the seaside is constructed using edge data, where the shallow water equation is as follows: ; ; Where h is the total water depth, Let η be the vertical average flow velocity vector, η be the water level, and g be the acceleration due to gravity. and ρ represents the surface wind stress and the bed bottom shear stress vectors, respectively; ρ is the water density; S is the wave radiation stress tensor; f is the Coriolis parameter; and ν is the horizontal eddy viscosity coefficient.
[0032] Obtaining effective seabed shear stress under the combined action of waves and tides. The following formula is used for calculation:
[0033] in, Shear stress caused by tidal current. This represents the maximum shear stress caused by the waves. and These are nonlinear interaction coefficients.
[0034] Vector of total sediment transport rate at the coast For the transfer of matter With suspended matter The sum; the calculation formula is as follows:
[0035] In another alternative embodiment, the bedload transport rate is calculated. For non-cohesive sediments: the wave-corrected Soulsby-van Rijn formula is used.
[0036] in, This is a comprehensive coefficient. The root mean square of the wave's near-bottom trajectory velocity. This is the drag coefficient. Where β is the critical starting velocity and β is the subsurface slope angle, The angle between the direction of water flow and the direction of descent of the slope; This is the subgrade slope influence correction factor introduced in this invention.
[0037] Cohesive silt: Using the Partheniades-Krone formula framework: Erosion flux E: when > hour , This represents the critical shear stress for erosion.
[0038] Deposition flux D: when < hour, , The critical shear stress for deposition. For rapid flocculation and sedimentation, This is near-bottom concentration.
[0039] The suspended sediment transport rate is calculated by integral after obtaining the concentration field C(x,y,z,t) by solving the suspended sediment convection-diffusion equation:
[0040] The convection-diffusion equation is:
[0041] Where K is the effective diffusion tensor, and These represent the erosion rate and deposition rate per unit area per unit time, respectively.
[0042] The subgrade deformation module (terrain evolution) updates the subgrade elevation zb based on the conservation of sediment mass (Exner equation):
[0043] Where p is the porosity of the substrate.
[0044] Example 3 refer to Figure 2 A device for constructing a model of seaside mud and sand, comprising, Acquisition device to acquire initial coastal environmental data; based on the initial coastal environmental data, acquire shallow water model and seabed shear stress. The device is used to determine the critical shear stress and to judge the sediment movement state based on the shear stress on the seabed and the critical shear stress. The computing device constructs a bed deformation model and obtains the bed elevation based on the sediment movement state and the bed deformation model.
[0045] Furthermore, the initial coastal environmental data includes surface wind stress and bed bottom shear stress vectors, water density, wave radiation stress tensor, Coriolis parameters, and horizontal eddy viscosity coefficient.
[0046] Preferably, the formula for calculating the shear stress on the seabed surface is as follows: ; in, Shear stress caused by tidal current. This represents the maximum shear stress caused by the waves. and These are nonlinear interaction coefficients.
[0047] In another optional embodiment of the present invention, the determination device obtains the critical shear stress, and the determination of the sediment movement state based on the seabed shear stress and the critical shear stress includes the following steps: Obtain the critical shear stress; if the critical shear stress is less than the shear stress on the seabed, sediment will be deposited. If the critical shear stress is greater than the shear stress on the seabed, then the seabed will erode.
[0048] Furthermore, the formula for calculating sediment deposition is as follows: , in, The critical shear stress for deposition. For rapid flocculation and sedimentation, This is near-bottom concentration. This represents the shear stress on the seabed surface.
[0049] Furthermore, the formula for calculating bed erosion is as follows: , in, The critical shear stress for erosion; denoted as shear stress on the seabed; M is the erosion rate coefficient.
[0050] Example 4 A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in Embodiment 1 or Embodiment 2.
[0051] Specifically, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the seaside mud and sand model construction device.
[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for constructing a seaside sediment model, characterized in that, Includes the following steps: Obtain initial coastal environmental data; The shallow water model and seabed shear stress were obtained based on the initial coastal environmental data. Obtain the critical shear stress, and determine the sediment movement state based on the shear stress on the seabed and the critical shear stress. Construct a subsoil deformation model and obtain the subsoil elevation based on the sediment movement state and the subsoil deformation model.
2. The method for constructing a seaside sediment model according to claim 1, characterized in that, The initial coastal environmental data includes surface wind stress and bed bottom shear stress vectors, water density, wave radiation stress tensor, Coriolis parameters, and horizontal eddy viscosity coefficient.
3. The method for constructing a seaside sediment model according to claim 1, characterized in that, The formula for calculating the shear stress on the seabed surface is as follows: in, Shear stress caused by tidal current. This represents the maximum shear stress caused by the waves. and These are nonlinear interaction coefficients.
4. The method for constructing a seaside sediment model according to claim 1, characterized in that, The process of obtaining the critical shear stress and determining the sediment movement state based on the seabed shear stress and the critical shear stress includes the following steps: Obtaining the critical shear stress If the critical shear stress is less than the shear stress on the seabed, sediment will be deposited. If the critical shear stress is greater than the shear stress on the seabed, then the seabed will erode.
5. The method for constructing a seaside sediment model according to claim 4, characterized in that, The formula for calculating sediment deposition is as follows: ， in, The critical shear stress for deposition. For rapid flocculation and sedimentation, Near-bottom concentration; This represents the shear stress on the seabed surface.
6. The method for constructing a seaside sediment model according to claim 4, characterized in that, The formula for calculating bed erosion is as follows: ， in, The critical shear stress for erosion; denoted as shear stress on the seabed; M is the erosion rate coefficient.
7. A device for constructing a seaside mud and sand model, characterized in that, include, Acquisition device to acquire initial coastal environmental data; based on the initial coastal environmental data, acquire shallow water model and seabed shear stress. The device is used to determine the critical shear stress and to judge the sediment movement state based on the shear stress on the seabed and the critical shear stress. The computing device constructs a bed deformation model and obtains the bed elevation based on the sediment movement state and the bed deformation model.
8. The seaside mud and sand model construction device according to claim 7, characterized in that, The formula for calculating the shear stress on the seabed surface is as follows: in, Shear stress caused by tidal current. This represents the maximum shear stress caused by the waves. and These are nonlinear interaction coefficients.
9. A seaside mud and sand model construction device according to claim 7, characterized in that, The determination device acquires the critical shear stress, and the determination of sediment movement state based on the seabed shear stress and the critical shear stress includes the following steps: Obtain the critical shear stress; if the critical shear stress is less than the shear stress on the seabed, sediment will be deposited. If the critical shear stress is greater than the shear stress on the seabed, then the seabed will erode.
10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-6.