Pile foundation wharf sediment erosion and deposition prediction system and method based on wave-current coupling simulation

Abstract

The invention discloses a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction system and method. The system comprises a preprocessing module, a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction module, a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction module and a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction module, the coupler module is used for realizing data synchronization and exchange among various modes through an MCT coupler by adopting a coupling numerical mode technology; the data conversion module is used for converting wave field data and flow field data into a hydrodynamic input file of a pile foundation structure; the FlOW3D module is used for inputting the pile foundation three-dimensional model at the current moment, the hydrodynamic conditions generated through coupling and the sediment parameters obtained after data preprocessing into a configured FLOW3D module program to simulate erosion and deposition of sediment around the pile foundation under the real sea area condition, and the erosion and deposition form of the sediment around the pile at the current moment is obtained; and the visualization module is used for displaying the three-dimensional model of the pile foundation at each moment, the erosion and deposition form of the sediment around the pile and the early warning result in a visualization interface.

Description

Technical Field

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

[0002] The site selection of pile-foundation wharfs often faces a complex marine environment, and traditional methods for predicting silt deposition in pile-foundation wharfs 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. On the one hand, it will make it impossible to accurately predict the situation under extreme weather conditions. On the other hand, the coupling load may cause certain damage to the pile foundation.

[0003] Therefore, a pile foundation wharf sediment scouring and silting 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 silting model, accurately simulate the complex marine environment, and accurately evaluate the sediment scouring and silting situation of the pile foundation. Summary of the invention

[0004] Therefore, in order to solve the above defects in the prior art, the present invention provides a pile foundation terminal sediment scouring and silting prediction system and method based on wave-current coupling simulation, which can better combine the coupled numerical model and the sediment scouring and silting model to accurately simulate the complex marine environment, so as to accurately evaluate the sediment scouring and silting conditions of the pile foundation, thereby 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 silting prediction system based on wave-current coupling simulation, 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 mode technology, including at least ocean mode and wave mode, and realizes data synchronization and exchange between modes through MCT coupler; Data conversion module: converts wave field data and flow field data into hydrodynamic input files of pile foundation structure. The data conversion module can output data files in corresponding formats according to the requirements of FLOW3D software; FLOW3D module: Input 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 program to simulate the sediment scouring and silting around the pile foundation under real sea conditions, and obtain the sediment scouring and silting pattern around the pile at the current moment; the sediment scouring and silting pattern around the pile includes scouring and silting intensity, scouring and silting amount and scouring and silting 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 amount and scouring and silting distribution of the pile foundation at the current moment; construct 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 the early warning results in the visualization interface.

[0006] The present invention also discloses a method for predicting sediment scouring and silting of a pile foundation wharf based on wave-current coupling simulation, comprising the following steps: S1. Collect measured data of pile foundation and sediment parameters of target area, establish three-dimensional model of pile foundation according to measured data of pile foundation, and perform data preprocessing on measured data of pile foundation, sediment parameters and wind field data; S2. Based on the SWAN wave model, the distribution of wave energy, wave height, wavelength, wave direction and nonlinear interaction of waves are calculated. The wave field data output by the SWAN model will be used as input data for subsequent hydrodynamic calculations. S3. Provide three-dimensional flow field distribution based on ROMS ocean model, and provide fluid mechanics data support for hydrodynamic analysis of pile foundation; 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 of the pile foundation structure, and input it into the FLOW3D module as a boundary condition for calculation; S6. Based on the three-dimensional model of pile foundation, pre-processed sediment parameters and hydrodynamic boundary conditions, a sediment pile foundation scour model is established in the FLOW3D module to simulate the scouring and deposition of sediment around the pile foundation under real sea conditions, and the scouring and deposition patterns of sediment around the pile under the action of waves and currents are calculated; 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 forms of sediment around the pile in the real marine environment.

[0007] In S2, it includes: in the initialization stage, configuring the SWAN model of the 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 the input, including but not limited to data including wave height, period and propagation direction.

[0008] 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.

[0009] In S4, it includes: configuring coupling modes, defining 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 is fed back to the SWAN model to correct the wave propagation path and energy distribution.

[0010] In S5, it includes: converting the wave field and flow field data output by the ocean model and the wave model into a hydrodynamic input file through a 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 file 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.

[0011] In S6, it includes: configuring the FLOW3D module, including 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 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 around the pile foundation under real sea conditions, and obtaining the sediment scour shape around the pile at the current moment.

[0012] The technical solution of the present invention has the following advantages: In the present invention, a multi-physics field coupling model is adopted to integrate 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 silting around the pile foundation, and the scouring and silting intensity, scouring and silting amount and scouring and silting distribution at the current moment are obtained, and a three-dimensional sediment visualization model is established, which provides a scientific basis for the accurate evaluation of the sediment scouring and silting conditions of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the sediment scouring and silting prediction system for pile foundation wharf according to the present invention; Figure 2 A schematic diagram of the coupling between the ROMS ocean model and the SWAN wave model according to the present invention; Figure 3 This is a calculation diagram of the FLOW3D module of the present invention; Figure 4 This is a schematic diagram of the ocean current field distribution cloud map of the present invention; Figure 5 This is a schematic diagram of the ocean wave field distribution cloud map of the present invention; Figure 6 This is a visual schematic diagram of the silt scouring and silting situation described in the present invention. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] 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.

[0017] Example 1: Figure 1 As shown, this embodiment provides a pile foundation wharf sediment scouring and silting prediction system based on wave-current coupling simulation, including: 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 mode technology, including at least ocean mode and wave mode, and realizes data synchronization and exchange between modes through MCT coupler; Data conversion module: converts wave field data and flow field data into hydrodynamic input files of pile foundation structure. The data conversion module can output data files in corresponding formats according to the requirements of FLOW3D software; FLOW3D module: Input 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 program to simulate the sediment scouring and silting around the pile foundation under real sea conditions, and obtain the sediment scouring and silting pattern around the pile at the current moment; the sediment scouring and silting pattern around the pile includes scouring and silting intensity, scouring and silting amount and scouring and silting distribution; Visualization module: A three-dimensional sediment model is established based on the erosion and siltation pattern of the pile at the current moment, and the erosion and siltation intensity, erosion and siltation volume and erosion and siltation distribution of the pile foundation at the current moment are obtained; a visualization program is constructed to display the three-dimensional model of the pile foundation and the erosion and siltation pattern of the pile foundation at each moment (including erosion and siltation intensity, erosion and siltation volume and erosion and siltation distribution) and the early warning results in the visualization interface. It should be noted that the presentation data of the erosion and siltation intensity, erosion and siltation volume and erosion and siltation distribution of the pile foundation at the current moment are calculated by the flow3d template, and the visualization of these data is processed in the visualization module.

[0018] This application takes into account that the pile foundation of the high-pile dock is located in a complex marine environment. In actual engineering, it is often necessary 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 foundation. Therefore, the silt scouring and silting near the pile foundation should be paid special attention. Specifically, this embodiment performs coupled calculations on waves and currents based on the ROMS and SWAN modes, uses the FLOW3D module to build a pile foundation scouring model, simulates the pile foundation stress and silt scouring and silting around the pile foundation under real sea conditions, and establishes a pile foundation silt scouring and silting early warning system in a real marine environment through a visualization program.

[0019] Example 2: Figure 2 and 3 As shown, based on the above embodiment, this embodiment provides a method for predicting sediment scouring and silting of a pile-based wharf based on wave-current coupling simulation, comprising the following steps: S1. Collect measured data of pile foundation and sediment parameters of target area, establish three-dimensional model of pile foundation according to measured data of pile foundation, and pre-process measured data of pile foundation, sediment parameters and wind field data; in this step, sediment parameters are to simplify sediment into several particle sizes, and input its particle size, density, underwater repose angle and other parameters into FLOW3D model according to measured data; measured data of pile foundation is the basis for model grid establishment, which will directly affect the accuracy of calculation results; wind field data is existing open source data available on relevant scientific research websites and can be downloaded publicly; S2. Based on the SWAN wave model, the distribution of wave energy, wave height, wavelength, wave direction and nonlinear interaction of waves are calculated. The wave field data output by the SWAN model will be used as input data for subsequent hydrodynamic calculations. 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 the input, including but not limited to the data of wave height, period and propagation direction; Among them, the SWAN mode 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 Euler approximation. The specific expression is: , Energy spectrum It 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 represents the sources and sinks of wave energy density as described above; The source-sink equation in the SWAN model is: , 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, that is: , It represents the energy dissipation of whitecap breaking. The whitecap dissipation dominates the saturation degree of the high-frequency part of the spectrum in deep water. In the SWAN mode, it can be calculated by the Hasselmann model based on the pulse principle controlled by the wave steepness, that is: , in, is the wave number; and are the mean wave number and mean frequency, respectively; Depends on the average steepness factor , the expression is: , For the Pierson-Moskowitz spectrum, , , and is a parameter, and white hat dissipation is related to the selected wind input method; represents the bottom friction, which becomes important in wave propagation at medium depths and in shallow water; it is expressed as: , 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 motion trajectory , , represents the interaction of the four component waves, Indicates water depth induced breakage, 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 mode, 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.

[0020] like Figure 2 As shown, based on the above, step 2 is supplemented: (1) In order to simulate the flow state of real sea water, the RNG turbulence model is used as the turbulence model, and the initial conditions are gravity and the initial water level of the target sea area; (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 coarse sand to fine sand ratio, construct a sand bed in the wave flow flume, and describe the transport phenomenon of sediment around the pile foundation caused by the action of fluid and the influence of the pile foundation itself; (3) The pile foundation scour model needs to consider the size of the calculation 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 calculation domain range in this embodiment is 100D×10D×20D, and the sediment scour results focus on the 20D×10D range around the pile foundation; (4) Grid sparseness will directly affect the accuracy of numerical simulation results. This embodiment uses three layers of nested grids for calculation. The grids are 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 the range of 1m above and below the surface of the sediment layer. It is set as a uniform structure grid, and the size is controlled below 4mm to ensure the accuracy of the sediment scouring and silting calculation results; In the subsequent process, the FLOW3D module simulates the incoming flow conditions by controlling the mesh boundary condition input, setting the inflow 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.

[0021] S3. Provide three-dimensional flow field distribution based on ROMS ocean model, and provide fluid mechanics data support for hydrodynamic analysis of pile foundation; In S3, it includes: in the initialization stage, configure the ROMS model of the ocean mode, set the physical parameters including simulation domain, time step, vertical mixing and bottom drag; prepare the initial and boundary conditions of the ocean, including but not limited to temperature, salinity, density and terrain data; the ROMS model considers various ocean dynamic processes including tidal currents, eddies and ocean 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; In this embodiment, the ROMS mode uses the Sretched coordinate system, which can describe the influence of the topography on the flow field; the ROMS mode adopts a non-proportional stratification method in the vertical direction, which can better resolve the bottom boundary layer and the thermocline; in addition, the new horizontal pressure gradient calculation used in the ROMS mode significantly reduces the accumulation of horizontal pressure gradient calculation errors; the ROMS mode dynamic framework adopts the free surface, three-dimensional nonlinear baroclinic primitive equation, and the momentum control equation in the horizontal direction is expressed as: , , The equilibrium equation in the vertical direction is: , The continuity equation is: ; The conservation equation for temperature or salinity is: ; The equation of state for seawater is: ; S4. Exchange and synchronize data between the wave mode module and the ocean mode module through the MCT coupler; In S4, it includes: configuring coupling modes, defining grid mapping and communication paths between modes, and ensuring that data can be transmitted accurately and efficiently; the MCT coupler integrates multiple data exchange protocols and synchronization algorithms to achieve seamless connection between modes; the 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; S5. Convert the wave field data and flow field data into a hydrodynamic input file of the pile foundation structure, and input it into the FLOW3D module as a boundary condition for calculation; In S5, it includes: converting the wave field and flow field data output by the ocean model and the wave model into a hydrodynamic input file through a 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 file 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.

[0022] S6. Based on the three-dimensional model of pile foundation, pre-processed sediment parameters and hydrodynamic boundary conditions, a sediment pile foundation scour model is established in the FLOW3D module to simulate the scouring and deposition of sediment around the pile foundation under real sea conditions, and the scouring and deposition patterns of sediment around the pile under the action of waves and currents are calculated; In S6, it includes: configuring the FLOW3D module, including selecting a specified turbulence model and activating the sediment module to establish a sediment scouring model, setting the scope of the overall calculation domain and the focus range of the sediment scouring results, meshing the calculation domain, and setting the mesh 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 scouring and silting around the pile foundation under the real sea conditions, and obtaining the sediment scouring and silting shape around the pile foundation at the current moment; S7. Based on the calculated results of sediment scouring and silting around the pile under the action of waves and currents, a visualization module is constructed to analyze the changes in different scouring and silting forms of sediment around the pile in the real marine environment. The different scouring and silting forms of sediment around the pile at least include scouring and silting intensity, scouring and silting amount, and scouring and silting distribution, such as Figure 4 , 5 and 6.

[0023] In this embodiment, the RNG model in the turbulence model of the FLOW3D module is preferred. This model modifies the empirical coefficients in the standard two-equation k-ε model through explicit derivation, which can better adapt to the complex situation of deformation and breakage when the wave flow contacts the pile foundation. Compared with the Prandtl mixing length model and the single equation model, it can better simulate the coupling of wave and flow conditions, and can save simulation time compared with large eddy simulation. The specific expression is: ； ; Among them, k T is the turbulent kinetic energy; T is the turbulent kinetic energy dissipation rate; P T is the generation term of turbulent kinetic energy caused by velocity gradient.

[0024] 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.

[0025] The bedload movement in the sediment scour model is solved using the empirical model proposed by Meyer-Peter and Müller: ; in, is the density of the sediment; is the density of the fluid; is the median particle size of sediment.

[0026] The movement of suspended sediment is convection and diffusion of sediment in 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: ; Among them, C s,i is the sediment content; D is the diffusion rate; u s,i is the movement speed of suspended sediment.

[0027] Further, it should be noted that the FLOW3D module simulates the incoming flow conditions by controlling the grid boundary condition input. The following four types of boundary conditions are selected in this embodiment: Symmetry boundary condition: Symmetry boundary condition is the default boundary condition in FLOW3D. The flow flux and fluid shear force are zero on this boundary, and the normal velocity and normal gradient of all variables are zero. Symmetry boundary condition can simulate symmetrical flow problems well. The present invention uses symmetry boundary conditions on both the side and top surfaces of the wave flow model.

[0028] Pressure boundary condition (Specified pressure): The pressure boundary condition sets the pressure value on the boundary. Setting the water level elevation here can make the pressure on the boundary satisfy the static pressure distribution. The present invention uses the pressure boundary condition at the outlet of the wave flow flume model to control the water level elevation at the outlet.

[0029] Wall boundary condition (Wall): also known as no-slip boundary condition, the 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 the no-slip boundary condition at the bottom of the wave flow model.

[0030] Wave boundary condition (Wave): This boundary can control the inlet wave transmission. The wave enters the calculation domain and propagates in the direction perpendicular to the boundary. Waves can be defined as linear waves, Stokes second-order waves, Stokes fifth-order waves, solitary waves and random waves; at the same time, the flow velocity conditions can be defined at the boundary to achieve the interaction of waves and currents. By changing the wave type, inlet water depth, wave height, period, flow velocity and other parameters, the simulation of different sea environments can be achieved.

[0031] In summary, compared with the prior art, 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 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 the 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 silting around the pile foundation, and the scouring and silting intensity, scouring and silting amount and scouring and silting distribution at the current moment 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 silting conditions of the pile foundation.

[0032] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. The sediment scouring and silting prediction system for pile-based docks based on wave-current coupling simulation is characterized by: include: 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 mode technology, including at least ocean mode and wave mode, and realizes data synchronization and exchange between modes through MCT coupler; Data conversion module: convert wave field data and flow field data into hydrodynamic input files of pile foundation structure; FLOW3D module: Input 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 program to simulate the sediment scouring and silting around the pile foundation under real sea conditions, and obtain the sediment scouring and silting pattern around the pile at the current moment; the sediment scouring and silting pattern around the pile includes scouring and silting intensity, scouring and silting amount and scouring and silting 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 amount and scouring and silting distribution of the pile foundation at the current moment; construct 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.

2. A method for predicting sediment erosion and deposition of pile-foundation docks based on wave-current coupling simulation, characterized in that: The following steps are involved: S1. Collect measured data of pile foundation and sediment parameters of target area, establish three-dimensional model of pile foundation according to measured data of pile foundation, and perform data preprocessing on measured data of pile foundation, sediment parameters and wind field data; S2. Based on the SWAN wave model, the distribution of wave energy, wave height, wavelength, wave direction and nonlinear interaction of waves are calculated. The wave field data output by the SWAN model will be used as input data for subsequent hydrodynamic calculations. S3. Provide three-dimensional flow field distribution based on ROMS ocean model, and provide fluid mechanics data support for hydrodynamic analysis of pile foundation; 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 of the pile foundation structure, and input it into the FLOW3D module as a boundary condition for calculation; S6. Based on the three-dimensional model of pile foundation, pre-processed sediment parameters and hydrodynamic boundary conditions, a sediment pile foundation scour model is established in the FLOW3D module to simulate the scouring and deposition of sediment around the pile foundation under real sea conditions, and the scouring and deposition patterns of sediment around the pile under the action of waves and currents are calculated; 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 forms of sediment around the pile in the real marine environment.

3. The method for predicting sediment scouring and silting of pile-foundation docks based on wave-current coupling simulation according to claim 2 is characterized in that: In S2, it includes: In the initialization stage, the SWAN model of the ocean wave mode is configured, and the wave domain, boundary conditions and wind field input are set; the initial wave conditions and boundary conditions are prepared, 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.

4. The method for predicting sediment scouring and silting of pile-foundation docks based on wave-current coupling simulation according to claim 3 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 simulation domain, time step, vertical mixing and bottom drag; the initial and boundary conditions of the ocean are prepared, 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 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.

5. The method for predicting sediment erosion and deposition of pile-based docks based on wave-current coupling simulation according to claim 4, 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 is fed back to the SWAN model to correct the wave propagation path and energy distribution.

6. The method for predicting sediment erosion and deposition of pile-based wharf based on wave-current coupling simulation according to claim 5 is characterized in that: In S5, it includes: 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 the 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.

7. The method for predicting sediment scouring and silting of pile-foundation docks based on wave-current coupling simulation according to claim 6, characterized in that: In S6, it includes: Configuring the FLOW3D module includes 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 grid boundary conditions to simulate the incoming flow conditions; the three-dimensional model of the pile foundation at the current moment, the coupled generated hydrodynamic conditions, and the sediment parameters after data preprocessing are input into the configured FLOW3D module to simulate the scouring and deposition of sediment around the pile foundation under real sea conditions, and obtain the scouring and deposition pattern of sediment around the pile at the current moment.

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