A method for radionuclide migration and diffusion calculation of coastal storm surge

Abstract

The present application relates to a kind of radionuclide migration diffusion calculation method for coastal storm surge, obtain the environmental meteorological data in coastal area, form storm surge model, wherein the output of storm surge model is the change water level field caused by storm surge, flow velocity vector and turbulent diffusion coefficient;Obtain the physical and chemical parameters of target nuclide in coastal area, including radioactive decay constant and the distribution coefficient between sediment and seawater;Migration diffusion model is constructed, including sediment process term, the adsorption, desorption and sedimentation process of sediment in coastal area;The output of storm surge model is input into migration diffusion model as driving field, decoupling is carried out, and the spatio-temporal evolution process of radionuclide migration is obtained.The purpose that storm surge and nuclide diffusion migration are coupled together while considering the diffusion process of sediment is achieved, so that the technical effects that nuclide migration evaluation can respond to extreme storm surge scenario, simulation prediction accuracy is improved are realized.

Description

Technical Field

[0001] This invention relates to the field of nuclide migration calculation technology, and in particular to a method for calculating the migration and diffusion of radionuclides in coastal storm surges. Background Technology

[0002] Coastal nuclear power plants have been widely constructed and planned in coastal waters worldwide due to their convenient access to cooling water. However, while this coastal location brings convenience, it also exposes them directly to the threat of marine natural disasters. Among these, coastal floods and storm surges caused by extreme weather events such as strong typhoons have become a significant threat hanging over coastal nuclear power plants.

[0003] In addition, during coastal floods, there is a significant amount of suspended particulate sediment that diffuses. This particulate sediment is affected by storm surges during its diffusion process, which can alter the diffusion trajectory of radionuclides in the sea area.

[0004] Existing storm surge simulations and radionuclide diffusion assessments are often independent or involve only simple overlay analysis, failing to fully reflect the dynamic coupling and complex interactions between storm surges, tides, and the inherent properties of radionuclides. Furthermore, the simple overlay analysis fails to consider the impact of particulate sediment movement on radionuclide diffusion. This disconnect makes existing radionuclide migration assessment methods prone to insufficient accuracy and inaccurate predictions when dealing with extreme storm surge scenarios.

[0005] The above problems urgently need to be addressed. Summary of the Invention

[0006] This invention discloses a method for calculating the migration and diffusion of radionuclides in coastal storm surges, aiming to solve the technical problems existing in the prior art.

[0007] The present invention adopts the following technical solution: On one hand, this invention provides a method for calculating the migration and diffusion of radionuclides in coastal storm surges, comprising: acquiring environmental meteorological data in a coastal area, wherein the environmental data includes seabed topography data, shoreline data, historical typhoon meteorological data, and tidal and current observation data; forming a storm surge model based on the environmental meteorological data, wherein the output of the storm surge model is a variable water level field, current velocity vector, and turbulent diffusion coefficient caused by the storm surge; acquiring a target nuclide and its physicochemical parameters in the coastal area, wherein the physicochemical parameters include a radioactive decay constant and a partition coefficient between sediment and seawater; constructing a migration and diffusion model based on the physicochemical parameters, wherein the migration and diffusion model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments in the coastal area; and inputting the output of the storm surge model as a driving field into the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration.

[0008] Optionally, based on the environmental meteorological data, a storm surge model is formed, including: selecting a hydrodynamic model to construct a computational domain grid structure within the coastal area; inputting the environmental meteorological data as a forced field into the computational domain grid structure; and setting tidal level boundary conditions for the open boundary of the computational domain grid structure to form a storm surge model.

[0009] Optionally, based on the physicochemical parameters, a migration-diffusion model is constructed, including: determining the migration motion of nuclides carried by water currents in the coastal area based on the physicochemical parameters, forming a convection term; determining the diffusion effect of nuclides based on turbulence and molecular motion in the coastal area, forming a diffusion term; determining the characteristics of the target nuclide based on the physicochemical parameters, obtaining the exponential decay of the target nuclide over time, forming a decay term; simulating the adsorption, desorption, and sedimentation processes of particulate sediments in the coastal area based on the physicochemical parameters, forming a sedimentary process term; and combining the convection term, the diffusion term, the decay term, and the sedimentary process term to establish a convection-diffusion-reaction equation, forming a migration-diffusion model.

[0010] Optionally, the adsorption, desorption, and sedimentation processes of particulate sediments in the coastal area are simulated to form a sediment process term, including: the adsorption and desorption processes of particulate sediments in the coastal area are as follows: in, The adsorption or desorption coefficient of granular sediments. The adsorption rate constant is . The concentration of the target nuclide in the coastal area, Let be the desorption rate constant. The concentration of granular sediments, , It is determined by the partition coefficient between the sediment and the seawater.

[0011] Optionally, the adsorption, desorption, and sedimentation processes of granular sediments in the coastal area are simulated to form a sedimentation process term, including: the sedimentation process of granular sediments in the coastal area is as follows: in, The settling coefficient of granular sediments. The settling velocity of granular sediments. The concentration of granular sediments, This refers to the spatial location of granular sediments.

[0012] Optionally, by combining the convection term, the diffusion term, the decay term, and the sedimentary process term, a convection-diffusion-reaction equation is established, including: the convection-diffusion-reaction equation is: in, This refers to the concentration of the target nuclide within the coastal area. For time, For flow velocity vectors, This represents the spatial gradient of the concentration of the target nuclide. The turbulent diffusion coefficient is... The radioactive decay constant is... For source and sink items, This refers to the adsorption, desorption, and sedimentation processes of sediments.

[0013] Optionally, the output of the storm surge model is used as the driving field input to the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration. This includes: restricting the dynamic computational domain of the migration and diffusion model based on the variable water level field output by the storm surge model; using the flow velocity vector output by the storm surge model as the driving variable in the convection term and the turbulent diffusion coefficient as the driving variable in the diffusion term to form a time-varying migration and diffusion model; and solving the migration and diffusion model in a coupled manner at each time step based on the radioactive decay constant of the target nuclide and the distribution coefficient between sediment and seawater to output the simulated spatiotemporal evolution process of radionuclide migration.

[0014] According to another aspect of the present invention, a radionuclide migration and diffusion system for coastal storm surges is also provided, comprising: a meteorological data acquisition module for acquiring environmental meteorological data in a coastal area, wherein the environmental data includes seabed topography data, shoreline data, historical typhoon meteorological data, and tidal and current observation data; a storm surge model construction module for forming a storm surge model based on the environmental meteorological data, wherein the output of the storm surge model is a variable water level field, current velocity vector, and turbulent diffusion coefficient caused by the storm surge; a nuclide parameter acquisition module for acquiring a target nuclide and its physicochemical parameters in a coastal area, wherein the physicochemical parameters include a radioactive decay constant and a partition coefficient between sediment and seawater; a migration model construction module for constructing a migration and diffusion model based on the physicochemical parameters, wherein the migration and diffusion model includes a sediment process term, the sediment process term including the adsorption, desorption, and sedimentation processes of sediment in the coastal area; and a decoupling output module for inputting the output of the storm surge model as a driving field into the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration.

[0015] According to another aspect of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium storing a plurality of instructions adapted for loading and execution by a processor of any one of the methods for calculating the migration and diffusion of radionuclides in coastal storm surges.

[0016] According to another aspect of the present invention, a computer program product is also provided, comprising a computer program that, when executed by a processor, implements the steps of any one of the methods for calculating the migration and diffusion of radionuclides in coastal storm surges.

[0017] The technical solution adopted in this invention can achieve at least one of the following beneficial effects: In this embodiment of the invention, environmental meteorological data within a coastal area is acquired, including seabed topography data, shoreline data, historical typhoon meteorological data, and tidal and current observation data. Based on this environmental meteorological data, a storm surge model is formed, wherein the output of the storm surge model is the variable water level field, current velocity vector, and turbulence diffusion coefficient caused by the storm surge. Target nuclides and their physicochemical parameters within the coastal area are acquired, including radioactive decay constants and sediment-seawater partition coefficients. Based on these physicochemical parameters, a migration-diffusion model is constructed. The model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments in coastal areas. The output of the storm surge model is used as the driving field input to the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration. This achieves the goal of coupling storm surge with radionuclide diffusion and migration, while considering the diffusion process of sediments. This enables radionuclide migration assessment to cope with extreme storm surge scenarios and improves the accuracy of simulation and prediction. It also solves the technical problems of insufficient accuracy and risk of inaccurate prediction in existing radionuclide migration assessment methods when dealing with extreme storm surge scenarios. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a flowchart of a method for calculating the migration and diffusion of radionuclides in coastal storm surges, as described in Embodiment 1 of the present invention. Figure 2 This is a process structure diagram of a method for calculating the migration and diffusion of radionuclides in coastal storm surges according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of a radionuclide migration and diffusion system for coastal storm surges according to Embodiment 2 of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0021] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] First, to facilitate understanding of the embodiments of the present invention, some terms or nouns involved in the present invention will be explained below: Radionuclide migration refers to the spatial movement of radionuclides in a medium, and is one of the core research topics in the fields of nuclear environmental science, radiation protection, and nuclear waste disposal.

[0023] In the context of radionuclide migration research, coupling refers to the phenomenon of mutual correlation, mutual influence, and synergistic effect between different physical, chemical, and biological processes. These processes together determine the migration law of nuclides in the medium.

[0024] To address the problems existing in related technologies, this application provides a method for calculating the migration and diffusion of radionuclides in coastal storm surges.

[0025] Example 1 This embodiment provides a method for calculating the migration and diffusion of radionuclides in coastal storm surges, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a flowchart of a method for calculating the migration and diffusion of radionuclides in coastal storm surges, as described in Embodiment 1 of the present invention. Figure 2 This is a process structure diagram of a method for calculating the migration and diffusion of radionuclides in coastal storm surges according to Embodiment 1 of the present invention. The method includes: Step S102: Obtain environmental meteorological data in the coastal area, including seabed topography data, shoreline data, historical typhoon meteorological data, and tide and current observation data. Optionally, it is necessary to first collect high-precision seabed topography data, shoreline data, historical typhoon meteorological data (wind field, pressure field), and tide level and ocean current observation data for the coastal area under study. In marine storm surge simulation, these environmental meteorological data correspond to the complete physical processes of storm surge generation, propagation, and interaction with the coast, and none of them can be omitted.

[0026] Optionally, storm surge propagation is essentially the propagation and deformation of gravity waves in shallow sea areas, with seabed topography directly determining wave propagation speed, energy dissipation, and amplitude variations. The coastline, as the boundary between land and sea, directly determines the onshore extent of storm surges and their interaction with coastal engineering projects. Wind and pressure fields are the direct driving forces behind storm surge generation, with typhoons being the primary trigger for coastal storm surges. Tide level and ocean current observation data are crucial for model validation and calibration, and form the basis for simulating the coupling of storm surges with astronomical tides. These four types of data correspond to the four core components of storm surge simulation: "driving force - propagation channel - boundary constraints - validation and calibration," collectively constituting a complete simulation input system.

[0027] Step S104: Based on environmental meteorological data, a storm surge model is formed, wherein the output of the storm surge model is the variable water level field, flow velocity vector and turbulent diffusion coefficient caused by the storm surge. Optionally, a two-dimensional or three-dimensional hydrodynamic model can be selected to construct a computational domain grid. Environmental meteorological data is input into the computational domain grid model as a forcing field, and tidal level boundary conditions are applied at the open boundary. The computational domain grid model is validated and calibrated using collected historical storm surge events to ensure that it can accurately simulate the key characteristics of water level and flow velocity, forming the final storm surge model. The input of this storm surge model is environmental meteorological data, and the output is spatiotemporally continuous water level (η), flow velocity vector (u), and turbulence diffusion coefficient (K).

[0028] Optionally, setting tidal boundary conditions, i.e. applying the water level time series to the open boundary of the computational domain grid (the boundary connected to the open sea, which is different from the closed boundary of the land coastline), can provide the computational domain grid model with input of the open sea astronomical tide and background water level, effectively ensuring that the water flow movement in the simulated area is consistent with the real marine environment.

[0029] Optionally, by constructing a numerical model that can accurately reproduce the changes in nearshore water level and flow field under the coupling effect of storm surge and astronomical tide, a physical driving field can be provided for subsequent nuclide migration. That is, the data output by the storm surge model becomes the driving field in the subsequent migration and diffusion model, realizing the coupling of physical chemistry and hydrodynamics.

[0030] In some preferred embodiments, a storm surge model is formed based on environmental meteorological data, including: selecting a hydrodynamic model to construct a computational domain grid structure within the coastal area; inputting environmental meteorological data as a forced field into the computational domain grid structure; and setting tidal level boundary conditions for the open boundary of the computational domain grid structure to form a storm surge model.

[0031] Step S106: Obtain the target nuclide and its physicochemical parameters within the coastal area, wherein the physicochemical parameters include the radioactive decay constant and the partition coefficient between sediment and seawater. Optionally, target nuclides can be identified, based on those commonly found in coastal areas. 137 Cs or 131 Taking I as an example, key physicochemical parameters of the target nuclide are collected, including the radioactive decay constant (λ) of the target nuclide and its partition coefficient between sediment and seawater. ) etc. Among them, 137 The decay constant λ of Cs is approximately 7.32 × 10⁻⁶. -10 s -1 , 131 The decay constant λ of I is approximately 9.98 × 10⁻⁶. -7 s -1 .

[0032] Step S108: Based on physicochemical parameters, a migration and diffusion model is constructed, wherein the migration and diffusion model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments in the coastal area; Optionally, a migration-diffusion model based on the convection-diffusion-reaction equation can be established. The governing equation is a convection-diffusion-reaction equation that includes multiple processes, and it is solved within a dynamic computational domain defined by the time-varying water level field η(x,y,t) output in real time by the storm surge model. This achieves coupling between physicochemical and hydrodynamic aspects, resulting in a more accurate understanding of the nuclide migration process under the influence of storm surge.

[0033] Optionally, to ensure a more accurate migration process, it is necessary to consider the impact of the movement of many suspended particles in the coastal area on the migration of nuclides. During the movement of suspended particles, the nuclides will move along the direction of particle movement. Therefore, in the process of constructing the convection-diffusion-reaction equation, it is necessary to study and extend the sediment process term.

[0034] In some preferred embodiments, a migration-diffusion model is constructed based on physicochemical parameters, including: determining the migration of nuclides carried by water currents in the coastal area based on physicochemical parameters, forming a convection term; determining the diffusion of nuclides based on turbulence and molecular motion in the coastal area, forming a diffusion term; determining the characteristics of the target nuclide based on physicochemical parameters, obtaining the exponential decay of the target nuclide over time, forming a decay term; simulating the adsorption, desorption, and sedimentation processes of particulate sediments in the coastal area based on physicochemical parameters, forming a sedimentary process term; and combining the convection term, diffusion term, decay term, and sedimentary process term to establish a convection-diffusion-reaction equation, forming a migration-diffusion model.

[0035] Optionally, the convection-diffusion-reaction equation includes a variety of terms that need to be considered. The more terms are considered, the closer the migration-diffusion model is to the actual diffusion process. However, when there are too many terms, it will increase the computational difficulty. Therefore, it is necessary to select a few terms with greater influence to form the convection-diffusion-reaction equation, so as to ensure that it is close to the actual diffusion process while reducing the computational difficulty.

[0036] Optional, specific convection-diffusion-reaction equations are as follows: The physical meaning and coupling relationship of each item are detailed as follows: Time variation ( This item represents the rate of change of the concentration of the target nuclide at a preset location within the coastal area over time.

[0037] Convection term ( This term represents the migration of target nuclides carried by water currents (ocean currents), and the velocity vector here is... The results are directly derived from the calculations of the storm surge model. The abnormal flow field caused by storm surge (such as offshore and coastal currents) directly determines the transport path and direction of the target nuclide through the convection term, which is a coupling term of physicochemical and hydrodynamic aspects. This represents the spatial gradient of nuclide concentration. It is an operator, representing the change of a physical quantity in space.

[0038] diffusion term ( This term represents the diffusion process of target nuclides from high-concentration areas to low-concentration areas due to turbulence and molecular motion. The diffusion coefficient K in the diffusion term is provided by the output of the storm surge model. During storm surges, high wind speeds and complex flow regimes significantly enhance the turbulence intensity of seawater, resulting in a K value much larger than in calm weather, leading to faster dispersion of target nuclides. This convection term is a coupling term between physicochemical and hydrodynamic aspects. It is the diffusion flux, which is related to the change in concentration gradient and the diffusion coefficient K.

[0039] decay term This refers to the radioactive target nuclide that decays exponentially over time due to its inherent radioactivity. The decay parameters are: , It is the half-life of the target nuclide.

[0040] Source and confluence ( ( ) refers to the source of release of a radioactive target nuclide, such as the emission outlet of the target nuclide in a coastal area.

[0041] Sedimentary process terms To simulate the complex behavior of sediments by nuclide migration models, the movement of target nuclides with sediments can be inferred through sediment process terms. These sediment process terms include multiple factors, specifically sediment adsorption and desorption processes, as well as sediment settling and suspension processes. All these factors constitute the sediment process term; therefore, the sediment process term is the sum of various sediment factors.

[0042] In some preferred embodiments, the adsorption, desorption, and sedimentation processes of particulate sediments in coastal areas are simulated to form a sedimentary process term, including: the adsorption and desorption processes of particulate sediments in coastal areas are as follows: in, The adsorption or desorption coefficient of granular sediments. The adsorption rate constant is . The concentration of the target nuclide in the coastal area, Let be the desorption rate constant. The concentration of granular sediments, , It is determined by the partition coefficient between sediments and seawater.

[0043] Optionally, for target nuclides that adsorb onto suspended particulate matter (sediments) (such as...) 137 Cs), requires the introduction of particulate phase concentration. And considering the dynamic exchange between the water and particle phases, the specific adsorption / desorption process is as follows: in, The adsorption rate constant is . Let be the desorption rate constant. , With allocation coefficient Related.

[0044] In some preferred embodiments, the adsorption, desorption, and sedimentation processes of particulate sediments in coastal areas are simulated to form a sedimentation process term, including: the sedimentation process of particulate sediments in coastal areas is as follows: in, The settling coefficient of granular sediments. The settling velocity of granular sediments. The concentration of granular sediments, This refers to the spatial location of granular sediments.

[0045] Optionally, during the settling and resuspension of sediments, for the particulate phase... A settlement term needs to be added to the equation. ,in It is the particle settling velocity.

[0046] Optional, sedimentary process item That is and The sum of terms.

[0047] In some preferred embodiments, a convection-diffusion-reaction equation is established by combining convection, diffusion, decay, and sedimentary process terms, including: The convection-diffusion-reaction equation is: in, This refers to the concentration of the target nuclide within the coastal area. For time, For flow velocity vectors, This represents the spatial gradient of the concentration of the target nuclide. The turbulent diffusion coefficient is... The radioactive decay constant is... For source and sink items, This refers to the adsorption, desorption, and sedimentation processes of sediments.

[0048] Step S110: The output of the storm surge model is used as the driving field input to the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration.

[0049] Optionally, the coupling process involves the mutual transfer of data output from the models to tightly connect the migration-diffusion model and the storm surge model, achieving dynamic coupling simulation. Specifically, the hydrodynamic field (u, η, K) output from the storm surge model is used as the driving field and input into the nuclide migration model in real time. Simultaneously, physicochemical parameters (λ, K) are defined in the nuclide migration model. (etc.), the nuclide migration model solves the coupling equation (i.e., the convection-diffusion-reaction equation) at each time step, thereby simulating the spatiotemporal evolution of the target nuclide concentration under the influence of storm surge.

[0050] Optionally, the physicochemical processes such as decay and adsorption of radioactive target nuclides can be dynamically coupled with a high-precision storm surge-tidal hydrodynamic model to construct a more realistic and predictive calculation method, effectively ensuring the safety of nuclear power plants and improving their disaster prevention and mitigation capabilities.

[0051] In some preferred embodiments, the output of the storm surge model is used as the driving field input to the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration. This includes: restricting the dynamic computational domain of the migration and diffusion model based on the variable water level field output by the storm surge model; using the flow velocity vector output by the storm surge model as the driving variable in the convection term and the turbulent diffusion coefficient as the driving variable in the diffusion term to form a time-varying migration and diffusion model; and coupling and solving the migration and diffusion model at each time step based on the radioactive decay constant of the target nuclide and the distribution coefficient between sediment and seawater to output the simulated spatiotemporal evolution process of radionuclide migration.

[0052] Through steps S102 to S110, the flow field, water level, and turbulent diffusion field driven by typical meteorological conditions such as typhoons are first simulated using a storm surge model. Then, these output hydrodynamic parameters are used as the driving field and input in real time into a nuclide migration model based on the convection-diffusion-reaction equation. This equation includes hydrodynamically driven convection and diffusion processes, simultaneously coupling key physicochemical processes inherent to the nuclide, such as radioactive decay, solid-liquid adsorption / desorption, and sedimentation / resuspension. Finally, a coupled model of radionuclide migration and diffusion under coastal flood and storm surge conditions is constructed to simulate and predict the migration and diffusion patterns of target nuclides. This achieves accurate simulation of radionuclide migration and diffusion under coastal flood and storm surge conditions, as well as quantitative assessment of environmental risks. It provides a more scientific and realistic prediction of the environmental consequences of the interaction between extreme natural disasters and nuclear technology facilities, offering simulation basis for emergency decision-making and long-term protection of nuclear power plants.

[0053] Example 2 This embodiment also provides a radionuclide migration and diffusion system for coastal storm surges. This system is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the terms "module" and "system" can refer to a combination of software and / or hardware that performs a predetermined function. Although the systems described in the following embodiments are preferably implemented in software, hardware implementations, or combinations of software and hardware, are also possible and contemplated.

[0054] According to embodiments of the present invention, a system embodiment for implementing the above-described method for calculating the migration and diffusion of radionuclides in coastal storm surges is also provided. Figure 3 This is a schematic diagram of a radionuclide migration and diffusion system for coastal storm surges according to Embodiment 2 of the present invention, as shown below. Figure 3 As shown, the above system includes: a meteorological data acquisition module 201, a storm surge model construction module 202, a nuclide parameter acquisition module 203, a migration model construction module 204, and a decoupling output module 205, wherein: Meteorological data acquisition module 201 acquires environmental meteorological data within the coastal area, including seabed topography data, shoreline data, historical typhoon meteorological data, and tide and current observation data. The storm surge model construction module 202 forms a storm surge model based on environmental meteorological data. The output of the storm surge model is the variable water level field, flow velocity vector and turbulence diffusion coefficient caused by the storm surge. The nuclide parameter acquisition module 203 acquires the target nuclide and its physicochemical parameters within the coastal area. The physicochemical parameters include the radioactive decay constant and the partition coefficient between sediment and seawater. The migration model construction module 204 constructs a migration and diffusion model based on physicochemical parameters. The migration and diffusion model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments in the coastal area. The decoupling output module 205 takes the output of the storm surge model as the driving field input to the migration and diffusion model, decouples the migration and diffusion model, and obtains the spatiotemporal evolution process of radionuclide migration.

[0055] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0056] It should be noted that the meteorological data acquisition module 201, storm surge model construction module 202, nuclide parameter acquisition module 203, migration model construction module 204, and decoupling output module 205 mentioned above correspond to steps S102 to S110 in the embodiments. The instances and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the content disclosed in the above embodiments. It should be noted that the above modules, as part of the system, can run on a computer terminal.

[0057] It should be noted that the optional or preferred implementation methods of this embodiment can be found in the relevant descriptions in the embodiments, and will not be repeated here.

[0058] The aforementioned radionuclide migration and diffusion system for coastal storm surges may further include a processor and a memory. The meteorological data acquisition module 201, storm surge model construction module 202, nuclide parameter acquisition module 203, migration model construction module 204, and decoupling output module 205 are all stored in the memory as program modules, and the processor executes the aforementioned program modules stored in the memory to achieve the corresponding functions.

[0059] The processor contains a core that retrieves the corresponding program modules from memory. One or more cores may be configured. Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory includes at least one memory chip.

[0060] According to an embodiment of this application, an embodiment of a non-volatile storage medium is also provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein, when the program runs, it controls the device containing the non-volatile storage medium to execute any of the aforementioned methods for calculating the migration and diffusion of radionuclides in coastal storm surges.

[0061] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals, and the non-volatile storage medium includes stored programs.

[0062] Optionally, during program execution, the device containing the non-volatile storage medium may be controlled to perform the following functions: acquire environmental meteorological data within the coastal area, including seabed topography data, shoreline data, historical typhoon meteorological data, and tidal and current observation data; based on the environmental meteorological data, form a storm surge model, wherein the output of the storm surge model is the variable water level field, velocity vector, and turbulent diffusion coefficient caused by the storm surge; acquire the target nuclide and its physicochemical parameters within the coastal area, including the radioactive decay constant and the partition coefficient between sediment and seawater; based on the physicochemical parameters, construct a migration and diffusion model, wherein the migration and diffusion model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments within the coastal area; input the output of the storm surge model as the driving field into the migration and diffusion model, decouple the migration and diffusion model, and obtain the spatiotemporal evolution process of radionuclide migration.

[0063] According to an embodiment of this application, an embodiment of a processor is also provided. Optionally, in this embodiment, the processor is used to run a program, wherein the program executes any of the above-described methods for calculating the migration and diffusion of radionuclides in coastal storm surges.

[0064] According to an embodiment of this application, an embodiment of a computer program product is also provided. Optionally, in this embodiment, the computer program product includes a computer program that, when executed by a processor, implements the steps of any of the above-described methods for calculating the migration and diffusion of radionuclides in coastal storm surges.

[0065] Optionally, when the aforementioned computer program product is executed on a data processing device, it is suitable to execute an initialization program with the following method steps: acquiring environmental meteorological data within the coastal area, wherein the environmental data includes seabed topography data, shoreline data, historical typhoon meteorological data, and tidal and current observation data; based on the environmental meteorological data, forming a storm surge model, wherein the output of the storm surge model is the variable water level field, velocity vector, and turbulent diffusion coefficient caused by the storm surge; acquiring the target nuclide and its physicochemical parameters within the coastal area, wherein the physicochemical parameters include the radioactive decay constant and the partition coefficient between sediment and seawater; based on the physicochemical parameters, constructing a migration and diffusion model, wherein the migration and diffusion model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments within the coastal area; and inputting the output of the storm surge model as a driving field into the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration.

[0066] This invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: acquiring environmental meteorological data within a coastal area, including seabed topography data, shoreline data, historical typhoon meteorological data, and tidal and current observation data; forming a storm surge model based on the environmental meteorological data, wherein the output of the storm surge model is the variable water level field, velocity vector, and turbulent diffusion coefficient caused by the storm surge; acquiring target nuclides and their physicochemical parameters within the coastal area, including radioactive decay constants and the partition coefficient between sediments and seawater; constructing a migration and diffusion model based on the physicochemical parameters, wherein the migration and diffusion model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments within the coastal area; and inputting the output of the storm surge model as a driving field into the migration and diffusion model to decouple the migration and diffusion model, thereby obtaining the spatiotemporal evolution process of radionuclide migration.

[0067] The order of the above embodiments of the present invention is merely for description and does not represent the superiority or inferiority of the embodiments.

[0068] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are merely illustrative; for example, the division of modules described above can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules, and may be electrical or other forms.

[0070] The modules described above as separate components may or may not be physically separate. Similarly, the components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple modules. Some or all of the modules can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0071] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0072] If the aforementioned integrated modules are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a non-volatile storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned non-volatile storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0073] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for calculating the migration and diffusion of radionuclides in coastal storm surges, characterized in that, include: Acquire environmental meteorological data within the coastal area, wherein the environmental data includes seabed topography data, shoreline data, historical typhoon meteorological data, and tide and current observation data; Based on the aforementioned environmental meteorological data, a storm surge model is formed, wherein the output of the storm surge model is the variable water level field, flow velocity vector, and turbulent diffusion coefficient caused by the storm surge; Acquire target nuclides and their physicochemical parameters within a coastal area, wherein the physicochemical parameters include radioactive decay constants and partition coefficients between sediments and seawater; Based on the aforementioned physicochemical parameters, a migration and diffusion model is constructed, wherein the migration and diffusion model includes a sedimentary process term, which includes the adsorption, desorption, and sedimentation processes of sediments in the coastal area; The output of the storm surge model is used as the driving field input to the migration and diffusion model to decouple the migration and diffusion model and obtain the spatiotemporal evolution process of radionuclide migration.

2. The method for calculating the migration and diffusion of radionuclides in coastal storm surges according to claim 1, characterized in that, Based on the aforementioned environmental meteorological data, a storm surge model is formed, including: A hydrodynamic model was selected to construct the computational domain grid structure within the coastal area. The environmental meteorological data is input as a forced field into the computational domain grid structure; A storm surge model is formed by setting tidal boundary conditions at the open boundary of the computational domain grid structure.

3. The method for calculating the migration and diffusion of radionuclides in coastal storm surges according to claim 1, characterized in that, Based on the aforementioned physicochemical parameters, a migration-diffusion model is constructed, including: Based on the aforementioned physicochemical parameters, the migration and movement of nuclides carried by water currents within the coastal area are determined, forming a convection term; Based on the turbulence and molecular motion in the coastal area, the diffusion effect of nuclides is determined, and a diffusion term is formed; Based on the physicochemical parameters, the characteristics of the target nuclide are determined, and the exponential decay of the target nuclide over time is obtained, forming a decay term; Based on the aforementioned physicochemical parameters, the adsorption, desorption, and sedimentation processes of particulate sediments in the coastal area are simulated to form sediment process terms. By combining the convection term, the diffusion term, the decay term, and the sedimentation process term, a convection-diffusion-reaction equation is established to form a migration-diffusion model.

4. The method for calculating the migration and diffusion of radionuclides in coastal storm surges according to claim 3, characterized in that, Simulating the adsorption, desorption, and sedimentation processes of granular sediments in the coastal area, a sedimentary process term is formed, including: The adsorption and desorption processes of granular sediments in the coastal area are as follows: in, The adsorption or desorption coefficient of granular sediments. The adsorption rate constant is . The concentration of the target nuclide in the coastal area, Let be the desorption rate constant. The concentration of granular sediments, , It is determined by the partition coefficient between the sediment and the seawater.

5. The method for calculating the migration and diffusion of radionuclides in coastal storm surges according to claim 3, characterized in that, Simulating the adsorption, desorption, and sedimentation processes of granular sediments in the coastal area, a sedimentary process term is formed, including: The sedimentation process of granular sediments in the coastal area is as follows: in, The settling coefficient of granular sediments. The settling velocity of granular sediments. The concentration of granular sediments, This refers to the spatial location of granular sediments.

6. The method for calculating the migration and diffusion of radionuclides in coastal storm surges according to claim 3, characterized in that, Combining the convection term, the diffusion term, the decay term, and the sedimentation process term, a convection-diffusion-reaction equation is established, including: The convection-diffusion-reaction equation is as follows: in, This refers to the concentration of the target nuclide within the coastal area. For time, For flow velocity vectors, This represents the spatial gradient of the concentration of the target nuclide. The turbulent diffusion coefficient is... The radioactive decay constant is... For source and sink items, This refers to the adsorption, desorption, and sedimentation processes of sediments.

7. The method for calculating the migration and diffusion of radionuclides in coastal storm surges according to claim 6, characterized in that, The output of the storm surge model is used as the driving field input to the migration and diffusion model. The migration and diffusion model is then decoupled to obtain the spatiotemporal evolution process of radionuclide migration, including: The dynamic computational domain of the migration and diffusion model is constrained based on the variable water level field output by the storm surge model. The flow velocity vector output by the storm surge model is used as the driving variable in the convection term, and the turbulent diffusion coefficient is used as the driving variable in the diffusion term to form a time-varying migration-diffusion model. Based on the radioactive decay constant of the target nuclide and the partition coefficient between sediment and seawater, the migration and diffusion model is coupled and solved in each time step to output the spatiotemporal evolution process of simulated radionuclide migration.

8. A radionuclide migration and diffusion system for coastal storm surges, characterized in that, include: The meteorological data acquisition module acquires environmental meteorological data within the coastal area, including seabed topography data, shoreline data, historical typhoon meteorological data, and tide and current observation data. The storm surge model construction module forms a storm surge model based on the environmental meteorological data. The output of the storm surge model is the variable water level field, flow velocity vector and turbulence diffusion coefficient caused by the storm surge. The nuclide parameter acquisition module acquires the target nuclide and its physicochemical parameters within the coastal area, wherein the physicochemical parameters include the radioactive decay constant and the partition coefficient between sediment and seawater. The migration model construction module constructs a migration and diffusion model based on the physicochemical parameters. The migration and diffusion model includes a sediment process term, which includes the adsorption, desorption, and sedimentation processes of sediments in the coastal area. The decoupling output module takes the output of the storm surge model as the driving field input to the migration and diffusion model, decouples the migration and diffusion model, and obtains the spatiotemporal evolution process of radionuclide migration.

9. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores multiple instructions, which are adapted to be loaded and executed by a processor as described in any one of claims 1 to 7, for calculating the migration and diffusion of radionuclides in coastal storm surges.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for calculating the migration and diffusion of radionuclides for coastal storm surges as described in any one of claims 1 to 7.

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