Sediment scouring and deposition prediction system and method for pile-foundation wharf based on wave-current coupling simulation

Abstract

The present invention discloses a pile foundation wharf sediment scouring and silting prediction system and method based on wave-current coupling simulation, comprising a preprocessing module for obtaining measured data of the pile foundation and sediment parameters of the target area, performing data preprocessing, and establishing a three-dimensional model of the pile foundation based on the measured data of the pile foundation after the preprocessing; a coupler module for realizing data synchronization and exchange between various modes through an MCT coupler by adopting a coupled numerical model technology; a data conversion module for converting wave field data and flow field data into a hydrodynamic input file of the pile foundation structure; a FLOW3D module for inputting the three-dimensional model of the pile foundation at the current moment, the hydrodynamic conditions generated by the coupling, and the sediment parameters after the data preprocessing into a configured FLOW3D module program for simulating sediment scouring and silting around the pile foundation under real sea conditions, and obtaining the sediment scouring and silting morphology around the pile at the current moment; and a visualization module for displaying the three-dimensional model of the pile foundation, the sediment scouring and silting morphology around the pile at each moment, and the early warning results in a visualization interface.

Description

Technical Field

[0001] The present invention relates to the technical field of port pile foundation load model analysis, and in particular to a system and method for predicting sediment scouring and silting of a pile foundation terminal based on wave-current coupling simulation. Background Art

[0002] The site selection of pile-foundation piers often faces complex marine environments, and traditional methods for predicting sediment deposition in pile-foundation piers often rely on empirical formulas and simplified models. These methods have many shortcomings when dealing with calculations in complex marine environments. For example, they ignore the coupling effects of waves and currents, which on the one hand makes it impossible to accurately predict the situation under extreme weather conditions, and on the other hand, the coupled loads may cause certain damage to the pile foundation.

[0003] Therefore, a pile foundation wharf sediment scouring and deposition prediction system and method based on wave-current coupling simulation is provided, which can better combine the coupled numerical model and the sediment scouring and deposition model, accurately simulate the complex marine environment, and accurately evaluate the sediment scouring and deposition situation of the pile foundation. Summary of the Invention

[0004] Therefore, in order to solve the above-mentioned defects in the prior art, the present invention provides a pile foundation terminal sediment scouring and deposition prediction system and method based on wave-current coupling simulation, which can better combine the coupled numerical model and the sediment scouring and deposition model, accurately simulate the complex marine environment, and accurately evaluate the sediment scouring and deposition conditions of the pile foundation, providing a scientific basis for the design, construction and operation of the port terminal.

[0005] The present invention discloses a pile foundation wharf sediment scouring and deposition prediction system based on wave-current coupling simulation, comprising:

[0006] Preprocessing module: After obtaining the measured data of pile foundation and the sediment parameters of the target area, data preprocessing is performed, and a three-dimensional model of pile foundation is established based on the measured data of pile foundation after data preprocessing;

[0007] Coupler module: Adopts coupled numerical model technology, including at least ocean model and wave model, and realizes data synchronization and exchange between models through MCT coupler;

[0008] Data conversion module: converts wave field data and flow field data into hydrodynamic input files of pile foundation structures. The data conversion module can output data files in the corresponding format according to the requirements of FLOW3D software;

[0009] FlOW3D module: Input the current three-dimensional pile foundation model, coupled hydrodynamic conditions, and sediment parameters after data preprocessing into the configured FLOW3D module program to simulate the sediment scouring and deposition around the pile foundation under real sea conditions, and obtain the sediment scouring and deposition pattern around the pile at the current moment; the sediment scouring and deposition pattern around the pile includes scouring and deposition intensity, scouring and deposition volume, and scouring and deposition distribution;

[0010] Visualization module: Establish a three-dimensional sediment model based on the scouring and silting pattern of the sediment around the pile at the current moment, and obtain the scouring and silting intensity, scouring and silting amount and scouring and silting distribution of the pile foundation at the current moment; build a visualization program to display the three-dimensional model of the pile foundation and the scouring and silting pattern of the sediment around the pile at each moment (including scouring and silting intensity, scouring and silting amount and scouring and silting distribution) and early warning results in the visualization interface.

[0011] The present invention also discloses a method for predicting sediment erosion and deposition of pile-foundation docks based on wave-current coupling simulation, which includes the following steps:

[0012] S1. Collect measured pile foundation data and sediment parameters in the target area, establish a three-dimensional pile foundation model based on the measured pile foundation data, and perform data preprocessing on the measured pile foundation data, sediment parameters, and wind field data;

[0013] S2. Calculate the wave energy distribution, wave height, wavelength, wave direction, and nonlinear wave interactions based on the SWAN wave model. The wave field data output by the SWAN model will serve as input data for subsequent hydrodynamic calculations.

[0014] S3. Providing three-dimensional flow field distribution based on the ROMS ocean model, providing fluid mechanics data support for the hydrodynamic analysis of pile foundations;

[0015] S4. Exchange and synchronize data between the wave mode module and the ocean mode module through the MCT coupler;

[0016] S5. Convert the wave field data and flow field data into a hydrodynamic input file for the pile foundation structure, and input it into the FLOW3D module as boundary conditions for calculation;

[0017] S6. Based on the three-dimensional pile foundation model, preprocessed sediment parameters, and hydrodynamic boundary conditions, a sediment pile foundation scour model was established in the FLOW3D module. This model simulated the scouring and deposition of sediment around the pile foundation under real sea conditions and calculated the scouring and deposition patterns around the pile under the action of waves and currents.

[0018] S7. Based on the calculated results of sediment scouring and deposition around piles under the action of waves and currents, a visualization module is constructed to analyze the changes in different scouring and deposition patterns of sediment around piles in real marine environments.

[0019] In S2, it includes: in the initialization stage, configuring the SWAN model of the ocean wave mode, setting the wave domain, boundary conditions and wind field input; preparing the initial wave conditions and boundary conditions, including but not limited to wave height, period and propagation direction; the SWAN model will receive the ocean flow field data of the ROMS model of the ocean mode, and simulate the wave characteristics of the nearshore area through this input, including but not limited to data including wave height, period and propagation direction.

[0020] In S3, it includes: in the initialization stage, configuring the ROMS model of the ocean mode, setting physical parameters including simulation domain, time step, vertical mixing and bottom drag; preparing ocean initial conditions and boundary conditions, including but not limited to temperature, salinity, density and terrain data; the ROMS model considers various ocean dynamic processes including tides, eddies and currents, simulates the flow field changes at different depths in the sea area, and generates data including ocean velocity, temperature and salinity by simulating ocean dynamic processes.

[0021] In S4, it includes: configuring coupling modes and defining grid mapping and communication paths between modes; the MCT coupler achieves seamless connection between modes by integrating multiple data exchange protocols and synchronization algorithms; the wave parameters calculated by the SWAN model are transmitted to the ROMS model to correct the sea surface stress and vertical mixing coefficient; the ocean current data calculated by the ROMS model are fed back to the SWAN model to correct the wave propagation path and energy distribution.

[0022] In S5, it includes: converting the wave field and flow field data output by the ocean model and wave model into hydrodynamic input files through the data conversion module; extracting time series data of specific points from the wave field and flow field data of the mesoscale model, including wave elevation, velocity components (u, v, w), and acceleration, and using the time series data to generate the required small-scale wave field data files in the FLOW3D module, and configuring the corresponding hydrodynamic effects in FLOW3D to simulate the hydrodynamic conditions of the pier pile foundation in the actual marine environment.

[0023] In S6, it includes: configuring the FLOW3D module, selecting the specified turbulence model and activating the sediment module to establish a sediment scour model, setting the scope of the overall calculation domain and the focus range of the sediment scour results, gridding the calculation domain, and setting the grid boundary conditions to simulate the incoming flow conditions; inputting the three-dimensional model of the pile foundation at the current moment, the coupled generated hydrodynamic conditions and the sediment parameters after data preprocessing into the configured FLOW3D module to simulate the sediment scour and deposition around the pile foundation under real sea conditions, and obtaining the sediment scour and deposition morphology around the pile at the current moment.

[0024] The technical solution of the present invention has the following advantages:

[0025] In the present invention, a multi-physics field coupling model is adopted to integrate the ROMS, SWAN model and FLOW3D module; on the one hand, this integrated coupling strategy can capture the multi-scale complex dynamic processes under extreme weather such as typhoons, including the internal dynamic response of the ocean and the generation and propagation of offshore waves; by fully considering the nonlinear interaction between various physical fields, the simulation accuracy of the wave and flow field coupling effect is significantly improved, especially under strong typhoon conditions, the system can accurately reproduce the dynamic evolution process of the complex marine environment, greatly reducing the error accumulation and systematic deviation of the traditional single model method; on the other hand, the FLOW3D module is used to calculate the changes in sediment scouring and deposition around the pile foundation, and the scouring and deposition intensity, scouring and deposition amount and scouring and deposition distribution at the current moment are obtained, and a three-dimensional sediment visualization model is established, which provides a scientific basis for the accurate assessment of the sediment scouring and deposition conditions of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the sediment scouring and silting prediction system for pile-foundation docks according to the present invention;

[0028] Figure 2 Schematic diagram of the coupling between the ROMS ocean model and the SWAN wave model according to the present invention;

[0029] Figure 3 This is a calculation diagram of the FLOW3D module of the present invention;

[0030] Figure 4 This is a schematic diagram of the ocean current field distribution cloud map of the present invention;

[0031] Figure 5 This is a schematic diagram of the ocean wave field distribution cloud map according to the present invention;

[0032] Figure 6 This is a visual schematic diagram of the sediment scouring and deposition situation described in the present invention. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Example 1: Figure 1 As shown, this embodiment provides a pile-foundation wharf sediment scouring and deposition prediction system based on wave-current coupling simulation, including:

[0036] Preprocessing module: After obtaining the measured data of pile foundation and the sediment parameters of the target area, data preprocessing is performed, and a three-dimensional model of pile foundation is established based on the measured data of pile foundation after data preprocessing;

[0037] Coupler module: Adopts coupled numerical model technology, including at least ocean model and wave model, and realizes data synchronization and exchange between models through MCT coupler;

[0038] Data conversion module: converts wave field data and flow field data into hydrodynamic input files of pile foundation structures. The data conversion module can output data files in the corresponding format according to the requirements of FLOW3D software;

[0039] FlOW3D module: Input the current three-dimensional pile foundation model, coupled hydrodynamic conditions, and sediment parameters after data preprocessing into the configured FLOW3D module program to simulate the sediment scouring and deposition around the pile foundation under real sea conditions, and obtain the sediment scouring and deposition pattern around the pile at the current moment; the sediment scouring and deposition pattern around the pile includes scouring and deposition intensity, scouring and deposition volume, and scouring and deposition distribution;

[0040] Visualization Module: Builds a 3D sediment model based on the current erosion and sedimentation patterns around the pile foundation, determining the current erosion and sedimentation intensity, volume, and distribution of the pile foundation. A visualization program is constructed to display the 3D model of the pile foundation, the erosion and sedimentation patterns around the pile foundation (including intensity, volume, and distribution), and early warning results at each moment in a visualization interface. It should be noted that the data for the current erosion and sedimentation intensity, volume, and distribution of the pile foundation are calculated using the flow3d template, and the visualization of this data is processed in the visualization module.

[0041] This application takes into account that the pile foundations of high-pile docks are located in a complex marine environment. In actual engineering, they often need to face the complex forces generated by the combined action of waves and currents, accompanied by the phenomenon of silt scouring and silting around the pile foundations. Therefore, the silt scouring and silting around the pile foundations should be paid special attention. Specifically, this embodiment uses the ROMS and SWAN modes to couple the wave and current calculations, uses the FLOW3D module to construct a pile foundation scour model, simulates the pile foundation forces and silt scouring and silting around the pile foundations under real sea conditions, and establishes a pile-surrounding silt scouring and silting early warning system in a real marine environment through a visualization program.

[0042] Example 2: Figure 2 and 3 As shown, based on the above embodiment, this embodiment provides a method for predicting sediment scouring and deposition of pile-foundation wharf based on wave-current coupling simulation, comprising the following steps:

[0043] S1. Collect measured pile foundation data and sediment parameters in the target area. Build a three-dimensional pile foundation model based on the measured data. Preprocess the measured data, sediment parameters, and wind field data. In this step, sediment parameters are simplified into several particle sizes. Based on the measured data, parameters such as particle size, density, and underwater angle of repose are input into the FLOW3D model. The measured pile foundation data is the foundation for building the model grid and directly affects the accuracy of the calculation results. Wind field data is available as publicly available, open-source data from relevant research websites.

[0044] S2. Calculate the wave energy distribution, wave height, wavelength, wave direction, and nonlinear wave interactions based on the SWAN wave model. The wave field data output by the SWAN model will serve as input data for subsequent hydrodynamic calculations.

[0045] S2 includes: in the initialization phase, configuring the SWAN model of the ocean wave mode, setting the wave domain, boundary conditions, and wind field input; preparing initial wave conditions and boundary conditions, including but not limited to wave height, period, and propagation direction; the SWAN model will receive ocean flow field data from the ROMS model of the ocean mode, and simulate the wave characteristics of the nearshore area through this input, including but not limited to wave height, period, and propagation direction;

[0046] The SWAN model is based on the linear random surface gravity wave theory (including the effect of flow) and adopts the wave action density spectrum balance equation based on the Euler approximation. The specific expression is:

[0047] ,

[0048] Energy spectrum Indicates that, represents the direction of wave propagation, represents the relative angular frequency, is the wave action density spectrum; specifically, the second and third terms represent the wave action density in and Space at speed The fourth term represents the propagation speed in frequency space due to depth and water flow. exist Propagation in space, right side term represents the sources and sinks of wave energy density as described above;

[0049] The source-sink equations in the SWAN model are:

[0050] ,

[0051] in, represents the intake of wind energy. Sea surface wind is an important energy source for wave generation and growth. The kinetic energy transmission caused by the surface wind field can be described by resonance and feedback mechanisms. Based on these two wind and wave growth mechanisms, the SWAN model expresses the wind energy input as the sum of linear and exponential growth, namely:

[0052] ,

[0053] It represents the energy dissipation of whitecap breaking. In deep water, whitecap dissipation dominates the saturation degree of the high-frequency part of the spectrum. In the SWAN mode, it can be calculated by the Hasselmann model based on the pulse principle controlled by the wave steepness, that is:

[0054] ,

[0055] in, is the wave number; and are the mean wave number and mean frequency, respectively; Depends on the average steepness , the expression is:

[0056] ,

[0057] For the Pierson-Moskowitz spectrum, , , and is a parameter, and white hat dissipation is related to the selected wind input method;

[0058] represents the bottom friction, which becomes important in wave propagation at medium depths and shallow waters; it is expressed as:

[0059] ,

[0060] in, is the bottom friction coefficient related to the bottom track motion, and its value generally depends on the speed of the bottom sea wave trajectory ,

[0061] ,

[0062] represents the interaction of the four component waves, Indicates water depth induced breaking, Indicates the interaction of three wave components. This embodiment will experiment with the parameters of wind energy intake, whitecap breaking energy dissipation, and bottom friction term of the wave model, and consider important processes such as wave bottom friction, shallowing, and whitecap breaking. Among the above six source terms / dissipation terms, , and is the main physical process of deep-water waves, and 、 and It is the physical process when waves propagate to shallow water areas.

[0063] like Figure 2 As shown, based on the above, step 2 is supplemented:

[0064] (1) In order to simulate the flow state of real sea water, the RNG turbulence model is selected as the turbulence model, and the initial conditions are gravity and the initial water level of the target sea area;

[0065] (2) Optimize the sediment ratio through sediment parameters, activate the sediment module to establish a sediment scour model, input parameters such as sediment density, particle size, and the ratio of coarse sand to fine sand, construct a sand bed in the wave flow flume, and describe the sediment transport phenomenon around the pile foundation caused by the fluid action and the influence of the pile foundation itself;

[0066] (3) The pile foundation scour model needs to consider the size of the computational domain. Considering that the sediment scour area around the pile foundation in the previous single pile scour model is only related to the pile foundation diameter D, the overall computational domain range in this embodiment is 100D × 10D × 20D, and the sediment scour results focus on the 20D × 10D range around the pile foundation;

[0067] (4) Grid sparseness will directly affect the accuracy of numerical simulation results. In this embodiment, a three-layer nested grid is used for calculation. The grid is encrypted from the outside to the inside. The grid is locally subdivided at the static water level of the outermost grid, and 20 grids are divided within the longitudinal wave height range. The innermost grid is within the 20D range around the pile foundation and the height is within 1m above and below the surface of the sediment layer. It is set as a uniform structure grid with a size controlled below 4mm to ensure the accuracy of the sediment erosion and deposition calculation results.

[0068] In the subsequent process, the FLOW3D module simulates the incoming flow conditions by controlling the mesh boundary condition input, setting the inlet boundary condition to a wave boundary condition, the outlet boundary condition to a pressure boundary condition, the side walls and the top boundary conditions to symmetric boundary conditions, and the bottom to a no-slip wall boundary condition.

[0069] S3. Providing three-dimensional flow field distribution based on the ROMS ocean model, providing fluid mechanics data support for the hydrodynamic analysis of pile foundations;

[0070] In S3, the following steps are included: During the initialization phase, the ROMS model of the ocean mode is configured, and the physical parameters set include the simulation domain, time step, vertical mixing, and bottom drag; initial ocean conditions and boundary conditions are prepared, including but not limited to temperature, salinity, density, and topography data; the ROMS model considers various ocean dynamic processes including tidal currents, eddies, and currents, simulates the flow field changes at different depths in the sea area, and generates data including ocean velocity, temperature, and salinity by simulating ocean dynamic processes;

[0071] In this embodiment, the ROMS model uses a sretched coordinate system, which can describe the influence of topography on the flow field. The ROMS model adopts a non-proportional layering method in the vertical direction, which can better resolve the bottom boundary layer and thermocline. In addition, the new horizontal pressure gradient calculation used in the ROMS model significantly reduces the accumulation of horizontal pressure gradient calculation errors. The ROMS model dynamic framework adopts a free surface, three-dimensional nonlinear baroclinic primitive equation. The momentum control equation in the horizontal direction is expressed as:

[0072] ,

[0073] ,

[0074] The equilibrium equation in the vertical direction is:

[0075] ,

[0076] The continuity equation is:

[0077] ;

[0078] The conservation equation for temperature or salinity is:

[0079] ;

[0080] The equation of state of seawater is:

[0081] ;

[0082] S4. Exchange and synchronize data between the wave mode module and the ocean mode module through the MCT coupler;

[0083] S4 includes: configuring coupling modes, defining grid mapping and communication paths between modes, and ensuring accurate and efficient data transmission; the MCT coupler integrates multiple data exchange protocols and synchronization algorithms to achieve seamless connection between modes; wave parameters (such as wave height, wavelength, wave energy, etc.) calculated by the SWAN model are transmitted to the ROMS model to correct the sea surface stress and vertical mixing coefficient. These wave parameters affect the mixing layer depth and surface flow field of the ocean model by changing the dynamic process of the sea surface; the ocean current data calculated by the ROMS model are fed back to the SWAN model to correct the wave propagation path and energy distribution. The influence of ocean current on wave propagation characteristics is particularly significant, especially in strong current areas such as tidal currents or typhoon paths;

[0084] S5. Convert the wave field data and flow field data into a hydrodynamic input file for the pile foundation structure, and input it into the FLOW3D module as boundary conditions for calculation;

[0085] In S5, it includes: converting the wave field and flow field data output by the ocean model and wave model into hydrodynamic input files through the data conversion module; extracting time series data of specific points from the wave field and flow field data of the mesoscale model, including wave elevation, velocity components (u, v, w), and acceleration, and using the time series data to generate the required small-scale wave field data files in the FLOW3D module, and configuring the corresponding hydrodynamic effects in FLOW3D to simulate the hydrodynamic conditions of the pier pile foundation in the actual marine environment.

[0086] S6. Based on the three-dimensional pile foundation model, preprocessed sediment parameters, and hydrodynamic boundary conditions, a sediment pile foundation scour model was established in the FLOW3D module. This model simulated the scouring and deposition of sediment around the pile foundation under real sea conditions and calculated the scouring and deposition patterns around the pile under the action of waves and currents.

[0087] In S6, the following steps are included: configuring the FLOW3D module, selecting a specified turbulence model and activating the sediment module to establish a sediment scour model, setting the scope of the overall calculation domain and the focus range of the sediment scour results, meshing the calculation domain, and setting mesh boundary conditions to simulate the incoming flow conditions; inputting the current pile foundation three-dimensional model, the coupled generated hydrodynamic conditions, and the sediment parameters after data preprocessing into the configured FLOW3D module to simulate the sediment scour and deposition around the pile foundation under real sea conditions, and obtaining the sediment scour and deposition pattern around the pile foundation at the current moment;

[0088] S7. Based on the calculated results of sediment scouring and deposition around the pile under the action of waves and currents, a visualization module is constructed to analyze the changes in different scouring and deposition patterns of sediment around the pile in a real marine environment. The different scouring and deposition patterns of sediment around the pile include at least scouring and deposition intensity, scouring and deposition volume, and scouring and deposition distribution, such as Figure 4 、 5 and 6.

[0089] In this example, the RNG model in the FLOW3D module turbulence model is preferred. This model modifies the empirical coefficients of the standard two-equation k-ε model through explicit derivation, which can better adapt to the complex deformation and breakage caused by the contact between waves and pile foundations. Compared with the Prandtl mixing length model and the single equation model, it can better simulate the coupling of wave and flow conditions and save simulation time compared to large eddy simulation. The specific expression is:

[0090] ；

[0091] ;

[0092] Among them, k T is the turbulent kinetic energy; ε T is the turbulent kinetic energy dissipation rate; P T is the generation term of turbulent kinetic energy caused by velocity gradient.

[0093] The sediment scour model of the FLOW3D module can describe the transport phenomenon of sediment around the pile foundation caused by the action of fluid and the influence of the pile foundation itself. The calculation of sediment movement mainly includes the following four points: (1) calculation of bed load transport; (2) calculation of suspended load transport; (3) calculation of sediment particle sedimentation due to gravity; (4) calculation of sediment entrainment caused by bed shear and water turbulence.

[0094] The bedload movement in the sediment scour model is solved using the empirical model proposed by Meyer-Peter and Müller:

[0095] ;

[0096] in, is the density of the sediment; is the density of the fluid; is the median particle size of sediment.

[0097] The movement of suspended sediment occurs through convection and diffusion in the water flow. The sediment scour model uses the empirical formula proposed by Mastbergen and Van Den Berg to describe the sediment transport process. The sediment transport equation in the model is:

[0098] ;

[0099] Among them, C s,i is the sediment content; D is the diffusion rate; u s,i is the movement speed of suspended sediment.

[0100] Furthermore, it should be noted that the FLOW3D module simulates the incoming flow conditions by controlling the mesh boundary condition input. In this embodiment, the following four types of boundary conditions are selected:

[0101] Symmetry: This is the default boundary condition in FLOW3D. The flow flux and shear force are zero across this boundary, and the normal velocity and normal gradients of all variables are also zero. Symmetry is particularly effective in modeling symmetrical flows. This paper uses symmetry on both the side and top surfaces of the wave flow model.

[0102] Specified pressure boundary conditions: These set a pressure value at the boundary. Setting the water level here ensures that the pressure at the boundary satisfies the static pressure distribution. This invention uses a specified pressure boundary condition at the outlet of the wave flow flume model to control the water level at the outlet.

[0103] Wall boundary condition: Also known as a no-slip boundary condition, a wall boundary condition sets a no-slip wall shear condition on the boundary, and the normal velocity of the fluid on the boundary is zero. The present invention uses a no-slip boundary condition at the bottom of the wave flow model.

[0104] Wave boundary conditions (Wave): These boundaries control the propagation of inlet waves, allowing waves to enter the computational domain and propagate perpendicular to the boundary. Waves can be defined as linear, Stokes second-order, Stokes fifth-order, solitary, and random waves. Flow conditions can also be defined at the boundary to achieve wave-current interaction. Simulating diverse marine environments is achieved by varying parameters such as wave type, inlet depth, wave height, period, and flow velocity.

[0105] In summary, compared with the existing technology, this application adopts a high-precision multi-physics field coupling model, integrating ROMS, SWAN model and FLOW3D program; on the one hand, this integrated coupling strategy can capture the multi-scale complex dynamic processes under extreme weather such as typhoons, including the internal dynamic response of the ocean and the generation and propagation of offshore waves; by fully considering the nonlinear interaction between various physical fields, the simulation accuracy of the wave and flow field coupling effect is significantly improved, especially under strong typhoon conditions, the system can accurately reproduce the dynamic evolution process of the complex marine environment, greatly reducing the error accumulation and systematic deviation of the traditional single model method; on the other hand, the FLOW3D module is used to calculate the changes in sediment scouring and deposition around the pile foundation, and the current scouring and deposition intensity, scouring and deposition amount and scouring and deposition distribution are obtained, and a three-dimensional sediment visualization model is established to provide a scientific basis for the accurate assessment of the sediment scouring and deposition conditions of the pile foundation.

[0106] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for predicting sediment erosion and deposition of pile-foundation docks based on wave-current coupling simulation is characterized by: The following steps are involved: S1. Collect measured pile foundation data and sediment parameters in the target area, establish a three-dimensional pile foundation model based on the measured pile foundation data, and perform data preprocessing on the measured pile foundation data, sediment parameters, and wind field data; S2. Calculate the wave energy distribution, wave height, wavelength, wave direction, and nonlinear wave interactions based on the SWAN wave model. The wave field data output by the SWAN model will serve as input data for subsequent hydrodynamic calculations. S3. Providing three-dimensional flow field distribution based on the ROMS ocean model, providing fluid mechanics data support for the hydrodynamic analysis of pile foundations; S4. Exchange and synchronize data between the wave mode module and the ocean mode module through the MCT coupler; S5. Convert the wave field data and flow field data into a hydrodynamic input file for the pile foundation structure, and input it into the FLOW3D module as boundary conditions for calculation; S6. Based on the three-dimensional pile foundation model, preprocessed sediment parameters, and hydrodynamic boundary conditions, a sediment pile foundation scour model was established in the FLOW3D module. This model simulated the scouring and deposition of sediment around the pile foundation under real sea conditions and calculated the scouring and deposition patterns around the pile under the action of waves and currents. S7. Based on the calculated results of sediment scouring and deposition around piles under the action of waves and currents, a visualization module is constructed to analyze the changes in different scouring and deposition patterns of sediment around piles in real marine environments.

2. The method for predicting sediment scouring and deposition of pile-foundation docks based on wave-current coupling simulation according to claim 1 is characterized in that: In S2, including: During the initialization phase, the SWAN model of the ocean wave model is configured, and the wave domain, boundary conditions, and wind field inputs are set. Initial wave and boundary conditions, including wave height, period, and propagation direction, are prepared. The SWAN model receives ocean current data from the ROMS model of the ocean model and uses this input to simulate the wave characteristics of the nearshore area, including data on wave height, period, and propagation direction.

3. The method for predicting sediment scouring and deposition of pile-foundation docks based on wave-current coupling simulation according to claim 2 is characterized in that: In S3, this includes: During the initialization phase, the ROMS model of the ocean mode is configured, and the physical parameters set include the simulation domain, time step, vertical mixing, and bottom drag; the initial and boundary conditions of the ocean are prepared, including temperature, salinity, density, and topography data; the ROMS model considers various ocean dynamic processes including tides, eddies, and currents, simulates the changes in flow fields at different depths in the sea area, and generates data including ocean velocity, temperature, and salinity by simulating ocean dynamic processes.

4. The method for predicting sediment erosion and deposition of pile-foundation docks based on wave-current coupling simulation according to claim 3 is characterized in that: In S4, it includes: Configure coupling modes and define grid mapping and communication paths between modes. The MCT coupler integrates multiple data exchange protocols and synchronization algorithms to achieve seamless connection between modes. The wave parameters calculated by the SWAN model are transmitted to the ROMS model to correct the sea surface stress and vertical mixing coefficient. The ocean current data calculated by the ROMS model are fed back to the SWAN model to correct the wave propagation path and energy distribution.

5. The method for predicting sediment scouring and deposition of pile-foundation docks based on wave-current coupling simulation according to claim 4 is characterized in that: In S5, including: The wave field and flow field data output by the ocean model and wave model are converted into hydrodynamic input files through the data conversion module. By extracting time series data of specific points from the wave field and flow field data of the mesoscale model, including wave elevation, velocity components (u, v, w), and acceleration, the time series data is used in the FLOW3D module to generate the required small-scale wave field data files, and the corresponding hydrodynamic effects are configured in FLOW3D to simulate the hydrodynamic conditions of the pier pile foundation in the actual marine environment.

6. The method for predicting sediment erosion and deposition of pile-foundation docks based on wave-current coupling simulation according to claim 5 is characterized in that: In S6, including: Configuring the FLOW3D module includes selecting a specified turbulence model and activating the sediment module to establish a sediment scour model, setting the scope of the overall calculation domain and the focus range of the sediment scour results, meshing the calculation domain, and setting mesh boundary conditions to simulate the incoming flow conditions; inputting the current three-dimensional model of the pile foundation, the coupled hydrodynamic conditions, and the sediment parameters after data preprocessing into the configured FLOW3D module to simulate the sediment scour and deposition around the pile foundation under real sea conditions, and obtaining the sediment scour and deposition pattern around the pile at the current moment.

7. The sediment scouring and deposition prediction system for pile-foundation docks based on wave-current coupling simulation is characterized by: It is used to implement the prediction method according to any one of claims 1 to 6, comprising: Preprocessing module: After obtaining the measured data of pile foundation and the sediment parameters of the target area, data preprocessing is performed, and a three-dimensional model of pile foundation is established based on the measured data of pile foundation after data preprocessing; Coupler module: Adopts coupled numerical model technology, including at least ocean model and wave model, and realizes data synchronization and exchange between models through MCT coupler; Data conversion module: converts wave field data and flow field data into hydrodynamic input files of pile foundation structure; FlOW3D module: Input the current three-dimensional pile foundation model, coupled hydrodynamic conditions, and sediment parameters after data preprocessing into the configured FLOW3D module program to simulate the sediment scouring and deposition around the pile foundation under real sea conditions, and obtain the sediment scouring and deposition pattern around the pile at the current moment; the sediment scouring and deposition pattern around the pile includes scouring and deposition intensity, scouring and deposition volume, and scouring and deposition distribution; Visualization module: Establish a three-dimensional sediment model based on the scouring and silting pattern of the sediment around the pile at the current moment, and obtain the scouring and silting intensity, scouring and silting volume and scouring and silting distribution of the pile foundation at the current moment; build a visualization program to display the three-dimensional model of the pile foundation and the scouring and silting pattern of the sediment around the pile and the early warning results at each moment in the visualization interface.

Images