Method and System for Processing Pollutant Concentration Data of Inflow Runoff, and Readable Storage Medium

Abstract

The present application provides a method and system for processing pollutant concentration data of ocean - entering runoff, a readable storage medium, which relates to the technical field of near - shore water environment monitoring. The method for processing pollutant concentration data of ocean - entering runoff includes: obtaining the ocean - entering runoff flow data and the pollutant concentration data of ocean - entering runoff in the research area; constructing a near - shore water environment model; simulating the water quality distribution in the near - shore sea area through the near - shore water environment model according to the simulated scenario combination; analyzing the simulated data through MatLab to obtain the linear response relationship formula among the ocean - entering runoff flow data, the area data of good - quality near - shore water, and the pollutant concentration data of ocean - entering runoff; and obtaining the pollutant concentration threshold of the ocean - entering runoff for the preset water quality sea area proportion according to the preset water quality sea area proportion, the ocean - entering runoff flow data, and the linear response relationship formula. Through the technical solution of the present application, the total amount of land - based pollution emissions can be determined based on the self - purification ability and environmental capacity of the near - shore sea area.

Description

Technical Field

[0001] This application relates to the technical field of offshore water environment monitoring. Specifically, it relates to a method and system for processing pollutant concentration data of sea - entering runoff, and a readable storage medium. Background Art

[0002] The phenomenon of eutrophication of coastal waters is prominent, and the marine ecosystem is facing huge environmental pressures. At present, the governance goals of each basin and sea area are not coordinated, resulting in inconsistent assessment indicators and quantitative standards for the cross - sections of sea - entering rivers and the water quality of the near - sea area, that is, the problem of "incoordination between land and sea". Summary of the Invention

[0003] Embodiments of the present application aim to at least improve the problem of inconsistent assessment indicators and quantitative standards for the cross - sections of sea - entering rivers and the water quality of the near - sea area.

[0004] To this end, the first object of the present application is to provide a method for processing pollutant concentration data of sea - entering runoff.

[0005] The second object of the present application is to provide a system for processing pollutant concentration data of sea - entering runoff.

[0006] The third object of the present application is to provide a system for processing pollutant concentration data of sea - entering runoff.

[0007] The fourth object of the present application is to provide a readable storage medium.

[0008] To achieve the first object of the present application, the technical solution of the first aspect of the present application provides a method for processing pollutant concentration data of sea - entering runoff, including: obtaining the sea - entering runoff flow data and sea - entering runoff pollutant concentration data of the research area; constructing a near - sea water environment model; constructing a plurality of simulation scenario combinations according to the sea - entering runoff flow data and sea - entering runoff pollutant concentration data; simulating the water quality distribution of the near - sea area through the near - sea water environment model according to the simulation scenario combinations to obtain simulation data; analyzing the simulation data through MatLab, and obtaining a linear response relationship formula among the sea - entering runoff flow data, the area of near - sea excellent water quality, and the sea - entering runoff pollutant concentration data through multiple regression; obtaining the proportion of the area of different preset water quality sea areas, and obtaining the sea - entering runoff pollutant concentration threshold of the proportion of the area of the preset water quality sea area according to the proportion of the area of the preset water quality sea area, the sea - entering runoff flow data, and the linear response relationship formula.

[0009] According to the method for processing the pollutant concentration data of the sea - entering runoff provided by this application, first, the relevant monitoring data of the sea - entering runoff are obtained, that is, the sea - entering runoff flow data and the pollutant concentration data of the sea - entering runoff in the study area. Then, a near - shore water environment model is constructed to simulate the hydrodynamic and water environment processes in the study area. Then, multiple simulation scenario combinations are constructed based on the sea - entering runoff flow data and the pollutant concentration data of the sea - entering runoff. The near - shore water environment model is used to simulate the water quality distribution in the near - shore sea area under different flow rates and pollutant concentrations in the sea - entering runoff, and simulation data are obtained. The simulation data are analyzed by MatLab, and a linear response relationship formula among the sea - entering runoff flow data, the area of excellent - quality near - shore water, and the pollutant concentration data of the sea - entering runoff is obtained through multiple regression. Finally, according to the specific goal of improving the area of excellent - quality near - shore water, different optimization objective functions are adopted for different target types. Based on the preset proportion of the sea area with a certain water quality, the sea - entering runoff flow data, and the linear response relationship formula, the pollutant concentration threshold of the sea - entering runoff for the preset proportion of the sea area with a certain water quality is obtained. By constructing a quantitative relationship between the land - based pollutant load and the water environment management goal, it is possible to determine the total amount of land - based pollution emissions based on the self - purification ability and environmental capacity of the near - shore sea area, clarify the strategy of protecting the ecosystem with the sea - entering rivers as corridors, which is of great significance for the coordinated control of land - sea pollution of near - shore water quality.

[0010] In addition, the technical solution provided by this application may also have the following additional technical features:

[0011] In some technical solutions, optionally, constructing a near - shore water environment model includes: obtaining the model boundary data, seabed topography data, temperature data, salinity data, precipitation - evaporation data, radiation intensity data, and tide data of the study area; constructing a MIKE3 hydrodynamic module and an ECOLAB water quality module based on the model boundary data, seabed topography data, temperature data, salinity data, precipitation - evaporation data, radiation intensity data, and tide data; coupling the ECOLAB water quality module with the MIKE3 hydrodynamic module to obtain a near - shore water environment model.

[0012] In this technical solution, an offshore water environment model is constructed based on the MIKE3 hydrodynamic module and the ECOLAB water quality module. Specifically, first, the model boundary data, seabed topography data, temperature data, salinity data, precipitation and evaporation data, radiation intensity data, and tidal data of the study area are obtained. Then, the MIKE3 hydrodynamic module and the ECOLAB water quality module are constructed according to the model boundary data, seabed topography data, temperature data, salinity data, precipitation and evaporation data, radiation intensity data, and tidal data. Then, the ECOLAB water quality module is coupled with the MIKE3 hydrodynamic module to obtain the offshore water environment model. Among them, the MIKE3 hydrodynamic module is constructed based on the three-dimensional incompressible fluid equation and the hydrostatic pressure assumption. The ECOLAB water quality module is used to describe the transformation process and interaction between chemical variables and ecosystem variables, operates in coupling with the MIKE3 hydrodynamic module, and integrates the advection-diffusion transport mechanism into the water quality simulation.

[0013] In some technical solutions, optionally, the concentration threshold of pollutants in the river runoff entering the sea for a preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the river runoff flow data, and the linear response relationship formula, including: when the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage, the first concentration threshold of pollutants in the river runoff entering the sea is obtained according to the preset season, the first preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship; when the preset water quality sea area ratio is that the water quality sea area of category IV and inferior to category IV does not exceed the second preset percentage, the second concentration threshold of pollutants in the river runoff entering the sea is obtained according to the preset season, the second preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship; when the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage and the water quality sea area of category IV and inferior to category IV does not exceed the second preset percentage, the third concentration threshold of pollutants in the river runoff entering the sea is obtained according to the preset season, the first preset percentage, the second preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship.

[0014] In this technical solution, the concentration threshold of pollutants in the river runoff for the preset water quality sea area ratio is obtained based on the preset water quality sea area ratio, the river runoff flow data, and the linear response relationship formula. Specifically, when the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage, the first concentration threshold of pollutants in the river runoff is obtained according to the preset season, the first preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship. When the preset water quality sea area ratio is that the area of the sea area with grade IV and inferior to grade IV water quality does not exceed the second preset percentage, the second concentration threshold of pollutants in the river runoff is obtained according to the preset season, the second preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship. When the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage and the area of the sea area with grade IV and inferior to grade IV water quality does not exceed the second preset percentage, the third concentration threshold of pollutants in the river runoff is obtained according to the preset season, the first preset percentage, the second preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship. According to the specific goals of improving the area of excellent water quality in the coastal waters, different optimization objective functions are adopted for different target types, and the concentration threshold of pollutants in the river runoff can be obtained.

[0015] In some technical solutions, optionally, the linear response relationship formula is:

[0016] ;

[0017] ;

[0018] Wherein, is the percentage of the excellent water quality sea area, is the percentage of the sea area with grade IV and inferior to grade IV water quality, is the river runoff flow data, is the preset season, is the concentration data of pollutants in the river runoff, is the first function, is the second function;

[0019] The calculation formula for the first concentration threshold of pollutants in the river runoff is:

[0020] ;

[0021] Wherein, is the first concentration threshold of pollutants in the river runoff, is the river runoff flow data, is the preset season, is the first preset percentage, is the inverse function of.

[0022] In this technical solution, when the proportion of the sea area with preset water quality is such that the sea area with excellent water quality is not less than . Assuming that the proportion of the sea area with the first and second types of water quality at season T is , the corresponding concentration value can be inversely calculated according to the response relationship between the concentration of pollutants entering the sea and the water quality in the coastal area as .

[0023] In some technical solutions, optionally, the calculation formula for the concentration threshold of the second pollutant in the runoff into the sea is:

[0024] ;

[0025] where is the concentration threshold of the second pollutant in the runoff into the sea, is the runoff flow data, is the preset season, is the second preset percentage, is the inverse function of

[0026] In this technical solution, when the proportion of the sea area with preset water quality is such that the sea area with four categories and inferior four categories of water quality does not exceed . Assuming that the proportion of the sea area with four categories and inferior four categories of water quality at season T is less than , the corresponding concentration value can then be calculated as .

[0027] In some technical solutions, optionally, the calculation formula for the concentration threshold of the third pollutant in the runoff into the sea is:

[0028] ;

[0029] where is the concentration threshold of the third pollutant in the runoff into the sea, is the runoff flow data, is the preset season, is the first preset percentage, is the second preset percentage, is the inverse function of is the inverse function of

[0030] In this technical solution, when the proportion of the sea area with preset water quality is such that the sea area with excellent water quality is not less than , and the sea area with four categories and inferior four categories of water quality does not exceed . At this time, the corresponding concentration threshold takes the smaller value of the two sub-thresholds.

[0031] In some technical solutions, optionally, the pollutant concentration data of the sea - entering runoff includes the total nitrogen concentration.

[0032] In this technical solution, the pollutant concentration data of the sea - entering runoff includes the total nitrogen concentration.

[0033] To achieve the second object of the present application, the technical solution of the second aspect of the present application provides a system for processing pollutant concentration data of sea - entering runoff, including: an acquisition module for acquiring the sea - entering runoff flow data and the pollutant concentration data of the sea - entering runoff in the study area; a model construction module for constructing a near - shore water environment model; a combination construction module for constructing multiple simulation scenario combinations according to the sea - entering runoff flow data and the pollutant concentration data of the sea - entering runoff; a simulation module for simulating the water quality distribution status of the near - shore sea area through the near - shore water environment model according to the simulation scenario combinations to obtain simulation data; an analysis module for analyzing the simulation data through MatLab and performing multiple regression to obtain a linear response relationship formula among the sea - entering runoff flow data, the area data of good - quality near - shore water, and the pollutant concentration data of the sea - entering runoff; a threshold calculation module for obtaining different preset water quality sea area ratios and obtaining the sea - entering runoff pollutant concentration threshold for the preset water quality sea area ratio according to the preset water quality sea area ratio, the sea - entering runoff flow data, and the linear response relationship formula.

[0034] According to the system for processing pollutant concentration data of sea - entering runoff provided by the present application, it includes an acquisition module, a model construction module, a combination construction module, a simulation module, an analysis module, and a threshold calculation module. Among them, the acquisition module is used to acquire the sea - entering runoff flow data and the pollutant concentration data of the sea - entering runoff in the study area. The model construction module is used to construct a near - shore water environment model. The combination construction module is used to construct multiple simulation scenario combinations according to the sea - entering runoff flow data and the pollutant concentration data of the sea - entering runoff. The simulation module is used to simulate the water quality distribution status of the near - shore sea area through the near - shore water environment model according to the simulation scenario combinations to obtain simulation data. The analysis module is used to analyze the simulation data through MatLab and perform multiple regression to obtain a linear response relationship formula among the sea - entering runoff flow data, the area data of good - quality near - shore water, and the pollutant concentration data of the sea - entering runoff. The threshold calculation module is used to obtain different preset water quality sea area ratios and obtain the sea - entering runoff pollutant concentration threshold for the preset water quality sea area ratio according to the preset water quality sea area ratio, the sea - entering runoff flow data, and the linear response relationship formula. By constructing a quantitative relationship between the land - sourced pollutant load and the water environment management target, it is possible to determine the total land - sourced pollution discharge based on the pollution self - purification ability and environmental capacity of the near - shore sea area, clarify the strategy for ecological system protection with the sea - entering rivers as corridors, and is of great significance for the coordinated control of land - sea pollution of near - shore water quality.

[0035] To achieve the third objective of the present application, the technical solution of the third aspect of the present application provides a system for processing the concentration data of pollutants in the sea-inflowing runoff, including: a memory and a processor. Among them, a program or instruction that can run on the processor is stored on the memory. When the processor executes the program or instruction, it implements the method for processing the concentration data of pollutants in the sea-inflowing runoff according to any one of the technical solutions in the first aspect. Therefore, it has the technical effects of any one of the technical solutions in the above first aspect, which will not be elaborated here.

[0036] To achieve the fourth objective of the present application, the technical solution of the fourth aspect of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, it implements the steps of the method for processing the concentration data of pollutants in the sea-inflowing runoff according to any one of the technical solutions in the first aspect. Therefore, it has the technical effects of any one of the technical solutions in the above first aspect, which will not be elaborated here.

[0037] The additional aspects and advantages of the present application will become obvious in the following description section, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 is a schematic flowchart of the steps of the method for processing the concentration data of pollutants in the sea-inflowing runoff according to an embodiment of the present application;

[0040] Figure 2 is a schematic flowchart of the steps of the method for processing the concentration data of pollutants in the sea-inflowing runoff according to an embodiment of the present application;

[0041] Figure 3 is a schematic flowchart of the steps of the method for processing the concentration data of pollutants in the sea-inflowing runoff according to an embodiment of the present application;

[0042] Figure 4 is a schematic block diagram of the structure of the system for processing the concentration data of pollutants in the sea-inflowing runoff according to an embodiment of the present application;

[0043] Figure 5 is a schematic block diagram of the structure of the system for processing the concentration data of pollutants in the sea-inflowing runoff according to an embodiment of the present application;

[0044] Figure 6 is a quantification diagram of the total nitrogen input - offshore water quality response of the method for processing the concentration data of pollutants in the sea-inflowing runoff according to an embodiment of the present application.

[0045] Among them, Figure 4 and Figure 5 The corresponding relationship between the reference numerals and the component names in is:

[0046] 10: The sea - inlet runoff pollutant concentration data processing system; 110: The acquisition module; 120: The model construction module; 130: The combination construction module; 140: The simulation module; 150: The analysis module; 160: The threshold calculation module; 20: The sea - inlet runoff pollutant concentration data processing system; 300: The memory; 400: The processor. Specific implementation manners

[0047] In order to more clearly understand the above - mentioned objects, features, and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0048] In the following description, many specific details are set forth to fully understand the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0049] The following refers to Figures 1 to 6 Describe the sea - inlet runoff pollutant concentration data processing method, system, and readable storage medium of some embodiments of the present application.

[0050] As Figure 1 shown, the embodiments of the first aspect of the present application provide a sea - inlet runoff pollutant concentration data processing method, including the following steps:

[0051] Step S102: Obtain the sea - inlet runoff flow data and sea - inlet runoff pollutant concentration data of the research area;

[0052] Step S104: Construct a near - sea water environment model;

[0053] Step S106: Construct multiple simulation scenario combinations according to the sea - inlet runoff flow data and sea - inlet runoff pollutant concentration data;

[0054] Step S108: Simulate the water quality distribution of the near - sea area through the near - sea water environment model according to the simulation scenario combination to obtain simulation data;

[0055] Step S110: Analyze the simulation data through MatLab, and obtain the linear response relationship formula among the sea - inlet runoff flow data, the area of good - quality near - sea water, and the sea - inlet runoff pollutant concentration data through multiple regression;

[0056] Step S112: Obtain the area ratios of different preset water - quality sea areas, and obtain the sea - inlet runoff pollutant concentration thresholds of the area ratios of the preset water - quality sea areas according to the area ratios of the preset water - quality sea areas, the sea - inlet runoff flow data, and the linear response relationship formula.

[0057] According to the method for processing the pollutant concentration data of the sea - going runoff provided by this embodiment, first, relevant monitoring data of the sea - going runoff are obtained, that is, the sea - going runoff flow data and the pollutant concentration data of the sea - going runoff in the study area. Then, a coastal water environment model is constructed based on the MIKE3 hydrodynamic module and the ECOLAB water quality module to simulate the hydrodynamic and water environment processes in the study area. Then, multiple simulation scenario combinations are constructed according to the sea - going runoff flow data and the pollutant concentration data of the sea - going runoff. The coastal water environment model is used to simulate the water quality distribution in the coastal sea area under different flow rates and pollutant concentrations in the sea, and simulation data are obtained. The simulation data are analyzed by MatLab, and a linear response relationship formula among the sea - going runoff flow data, the area of good - quality coastal water, and the pollutant concentration data of the sea - going runoff is obtained through multiple regression. Finally, according to the specific goal of improving the area of good - quality coastal water, different optimization objective functions are adopted for different target types. According to the preset proportion of the water area of the water quality sea area, the sea - going runoff flow data, and the linear response relationship formula, the pollutant concentration threshold of the sea - going runoff for the preset proportion of the water area of the water quality sea area is obtained. By constructing a quantitative relationship between the land - based pollutant load and the water environment management goal, it is possible to determine the total amount of land - based pollution emissions based on the self - purification ability and environmental capacity of the coastal sea, clarify the strategy for ecosystem protection with the sea - going rivers as the corridor, which is of great significance for the coordinated control of land - sea pollution of coastal water quality.

[0058] Among them, MIKE3 is a professional engineering software for three - dimensional free - surface flow, which can be used to simulate water conservancy, water quality, and sediment transport problems in rivers, lakes, reservoirs, large estuaries, and the open sea. It can simulate unsteady flows with different vertical densities and simultaneously consider the influence of external forces, such as meteorology, tides, flow fields, and other water conservancy conditions. ECOLAB is a numerical laboratory for ecological models. It is open and is a water ecosystem model used to describe water quality, eutrophication, heavy metals, and ecology.

[0059] As Figure 2 shown, according to the method for processing the pollutant concentration data of the sea - going runoff proposed in an embodiment of this application, constructing a coastal water environment model includes the following steps:

[0060] Step S202: Obtain the model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data, and tidal data of the study area;

[0061] Step S204: Construct the MIKE3 hydrodynamic module and the ECOLAB water quality module according to the model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data, and tidal data;

[0062] Step S206: Couple the ECOLAB water quality module with the MIKE3 hydrodynamic module to obtain a coastal water environment model.

[0063] In this embodiment, an offshore water environment model is constructed based on the MIKE3 hydrodynamic module and the ECOLAB water quality module. Specifically, first, the model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data, and tidal data of the study area are obtained. Then, the MIKE3 hydrodynamic module and the ECOLAB water quality module are constructed according to the model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data, and tidal data. Then, the ECOLAB water quality module is coupled with the MIKE3 hydrodynamic module to obtain an offshore water environment model. Among them, the MIKE3 hydrodynamic module is based on the three-dimensional incompressible fluid equation and the hydrostatic pressure assumption. The ECOLAB water quality module is used to describe the transformation process and interaction between chemical variables and ecosystem variables, and operates in conjunction with the MIKE3 hydrodynamic module to integrate the advection-diffusion transport mechanism into the water quality simulation.

[0064] As Figure 3 shown, according to the method for processing the pollutant concentration data of the river runoff into the sea proposed in an embodiment of the present application, the pollutant concentration threshold of the river runoff into the sea with a preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the river runoff flow data, and the linear response relationship formula, which specifically includes the following steps:

[0065] Step S302: When the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage, the first river runoff pollutant concentration threshold is obtained according to the preset season, the first preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship;

[0066] Step S304: When the preset water quality sea area ratio is that the water quality of the fourth and inferior fourth categories of sea areas does not exceed the second preset percentage, the second river runoff pollutant concentration threshold is obtained according to the preset season, the second preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship;

[0067] Step S306: When the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage and the water quality of the fourth and inferior fourth categories of sea areas does not exceed the second preset percentage, the third river runoff pollutant concentration threshold is obtained according to the preset season, the first preset percentage, the second preset percentage, the river runoff flow data, and the inverse function formula of the linear response relationship.

[0068] In this embodiment, in this technical solution, the concentration threshold of pollutants in the incoming river runoff for a preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the incoming river runoff flow data, and the linear response relationship formula. Specifically, when the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage, the first concentration threshold of pollutants in the incoming river runoff is obtained according to the preset season, the first preset percentage, the incoming river runoff flow data, and the inverse function formula of the linear response relationship. When the preset water quality sea area ratio is that the area of the fourth-class and inferior fourth-class water quality sea area does not exceed the first preset percentage, the second concentration threshold of pollutants in the incoming river runoff is obtained according to the preset season, the second preset percentage, the incoming river runoff flow data, and the inverse function formula of the linear response relationship. When the preset water quality sea area ratio is that the excellent water quality sea area is not less than the first preset percentage and the area of the fourth-class and inferior fourth-class water quality sea area does not exceed the second preset percentage, the third concentration threshold of pollutants in the incoming river runoff is obtained according to the preset season, the first preset percentage, the second preset percentage, the incoming river runoff flow data, and the inverse function formula of the linear response relationship. According to the specific goal of improving the area of excellent water quality in the coastal waters, different optimization objective functions are adopted for different target types, and the concentration threshold of pollutants in the incoming river runoff can be obtained.

[0069] In some embodiments, optionally, the linear response relationship formula is:

[0070] ;

[0071] ;

[0072] Wherein, is the percentage of the excellent water quality sea area, is the percentage of the fourth-class and inferior fourth-class water quality sea area, is the incoming river runoff flow data, is the preset season, is the concentration data of pollutants in the incoming river runoff, is the first function, is the second function;

[0073] The calculation formula for the first concentration threshold of pollutants in the incoming river runoff is:

[0074] ;

[0075] Wherein, is the first concentration threshold of pollutants in the incoming river runoff, is the incoming river runoff flow data, is the preset season, is the first preset percentage, is the inverse function of When the proportion of the sea area with preset water quality is such that the sea area with excellent water quality is not less than . Assuming that the proportion of the sea area with the first and second types of water quality at season T is , the corresponding concentration value can be reversely calculated according to the response relationship between the concentration of pollutants discharged into the sea and the water quality in the coastal area as .

[0076] In some embodiments, optionally, the calculation formula for the concentration threshold of the second pollutant in the runoff into the sea is:

[0077] ;

[0078] Wherein, is the concentration threshold of the second pollutant in the runoff into the sea, is the runoff flow data, is the preset season, is the second preset percentage, is the inverse function of. When the proportion of the sea area with preset water quality is such that the sea area with the fourth and inferior fourth types of water quality does not exceed . Assuming that the proportion of the sea area with the fourth and inferior fourth types of water quality at season T is less than , the corresponding concentration value can then be calculated as .

[0079] In some embodiments, optionally, the calculation formula for the concentration threshold of the third pollutant in the runoff into the sea is:

[0080] ;

[0081] Wherein, is the concentration threshold of the third pollutant in the runoff into the sea, is the runoff flow data, is the preset season, is the first preset percentage, is the second preset percentage, is the inverse function of, is the inverse function of. When the proportion of the sea area with preset water quality is such that the sea area with excellent water quality is not less than , and the sea area with the fourth and inferior fourth types of water quality does not exceed . At this time, the corresponding concentration threshold takes the smaller value of the two sub-thresholds.

[0082] In some embodiments, optionally, the pollutant concentration data in the runoff into the sea includes the total nitrogen concentration.

[0083] Such as Figure 4As shown in the figure, an embodiment of the second aspect of the present application provides a system 10 for processing the concentration data of pollutants in the sea-inflowing runoff, including: an acquisition module 110, configured to acquire the sea-inflowing runoff flow data and the sea-inflowing runoff pollutant concentration data of the study area; a model construction module 120, configured to construct a near-sea water environment model; a combination construction module 130, configured to construct a plurality of simulation scenario combinations according to the sea-inflowing runoff flow data and the sea-inflowing runoff pollutant concentration data; a simulation module 140, configured to simulate the water quality distribution status of the near-sea area through the near-sea water environment model according to the simulation scenario combinations to obtain simulation data; an analysis module 150, configured to analyze the simulation data through MatLab and perform multiple regression to obtain a linear response relationship formula among the sea-inflowing runoff flow data, the area data of the near-sea excellent water quality area, and the sea-inflowing runoff pollutant concentration data; a threshold calculation module 160, configured to obtain different preset water quality sea area ratios, and obtain the sea-inflowing runoff pollutant concentration threshold corresponding to the preset water quality sea area ratio according to the preset water quality sea area ratio, the sea-inflowing runoff flow data, and the linear response relationship formula.

[0084] The system 10 for processing the concentration data of pollutants in the sea-inflowing runoff provided by this embodiment includes an acquisition module 110, a model construction module 120, a combination construction module 130, a simulation module 140, an analysis module 150, and a threshold calculation module 160. Among them, the acquisition module 110 is configured to acquire the sea-inflowing runoff flow data and the sea-inflowing runoff pollutant concentration data of the study area. The model construction module 120 is configured to construct a near-sea water environment model. The combination construction module 130 is configured to construct a plurality of simulation scenario combinations according to the sea-inflowing runoff flow data and the sea-inflowing runoff pollutant concentration data. The simulation module 140 is configured to simulate the water quality distribution status of the near-sea area through the near-sea water environment model according to the simulation scenario combinations to obtain simulation data. The analysis module 150 is configured to analyze the simulation data through MatLab and perform multiple regression to obtain a linear response relationship formula among the sea-inflowing runoff flow data, the area data of the near-sea excellent water quality area, and the sea-inflowing runoff pollutant concentration data. The threshold calculation module 160 is configured to obtain different preset water quality sea area ratios, and obtain the sea-inflowing runoff pollutant concentration threshold corresponding to the preset water quality sea area ratio according to the preset water quality sea area ratio, the sea-inflowing runoff flow data, and the linear response relationship formula. By constructing a quantitative relationship between the land-based pollutant load and the water environment management target, it is possible to determine the total amount of land-based pollution emissions based on the pollution self-purification ability and environmental capacity of the near-sea area, clarify the strategy for ecological system protection with the sea-inflowing rivers as the corridors, which is of great significance for the coordinated control of land-sea pollution of the near-sea water quality.

[0085] As Figure 5As shown in the figure, an embodiment of the third aspect of the present application provides a system 20 for processing the concentration data of pollutants in the sea - entering runoff, including: a memory 300 and a processor 400. Among them, a program or instruction that can run on the processor 400 is stored on the memory 300. When the processor 400 executes the program or instruction, it implements the steps of the method for processing the concentration data of pollutants in the sea - entering runoff in any one of the embodiments of the first aspect. Therefore, it has the technical effects of any one of the embodiments of the first aspect, which will not be elaborated here.

[0086] An embodiment of the fourth aspect of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, it implements the steps of the method for processing the concentration data of pollutants in the sea - entering runoff in any one of the embodiments of the first aspect. Therefore, it has the technical effects of any one of the embodiments of the first aspect, which will not be elaborated here.

[0087] According to a specific embodiment of the method for processing the concentration data of pollutants in the sea - entering runoff provided by the present application, the method includes the following steps:

[0088] 1. Construct a river - coastal water environment model.

[0089] The coastal water environment model uses the MIKE3 hydrodynamic module and the ECOLAB water quality module to simulate the hydrodynamic and water environment processes in the study area. The MIKE3 hydrodynamic module is based on the three - dimensional incompressible fluid equation and the hydrostatic pressure assumption. The ECOLAB water quality module is used to describe the transformation processes and interactions between chemical variables and ecosystem variables, and operates in coupling with the MIKE3 hydrodynamic module, integrating the advection - diffusion transport mechanism into the water quality simulation.

[0090] 2. Fit the response relationship between land - based emissions and coastal water quality distribution.

[0091] Combined with the relevant monitoring data of the sea - entering runoff, n groups of combined simulation scenarios of the sea - entering flow and total nitrogen concentration are set. The coastal water environment model is used to simulate the water quality distribution in the coastal waters under different flow rates and sea - entering pollutant concentration conditions. MatLab is used to analyze and organize the simulation data, and a linear response relationship among the sea - entering runoff flow rate, the area of good - quality coastal waters, and the sea - entering pollutant concentration is obtained through multiple regression.

[0092] 3. Calculate the threshold value of the concentration of pollutants in the sea - entering runoff.

[0093] Overall consideration is given to the current water quality status of the study area and various regulatory documents issued at the present stage, and specific goals for improving the area of good - quality coastal waters are comprehensively proposed. For different target types, different optimization objective functions are adopted:

[0094] (1) The area of good - quality water areas is not less than Assume that the area proportions of the first and second-class water quality sea areas corresponding to season T are Based on the response relationship between the pollutant flux into the sea from the Yellow River and the offshore water quality, the corresponding concentration value can be calculated inversely as .

[0095] (1);

[0096] (2) The area of the sea areas with class-IV and inferior class-IV water quality does not exceed Assume that the area proportion of the sea areas with class-IV and inferior class-IV water quality corresponding to season T is less than After that, the corresponding concentration value can be calculated as .

[0097] (2);

[0098] (3) The area of the sea areas with excellent water quality is not less than , and the area of the sea areas with class-IV and inferior class-IV water quality does not exceed . At this time, the corresponding concentration threshold takes the smaller value of the two sub-thresholds.

[0099] (3).

[0100] As Figure 6 shown, specifically, the boundary information of the offshore water environment model in the study area is determined by tracing the outline through Google Earth; the seabed topography is sourced from the global DEM data published by GEBCO within the National Marine Science Data Center network in 2020; the initial water temperature field data uses the climatological monthly average data in ECMWF, and the initial salinity field data uses the HYCOM model; the water level data of the tidal boundary is taken from the MIKE tidal boundary; the temperature and salinity boundary data is obtained using HYCOM data; the monthly runoff data of the Lijin Hydrological Station is used for the study area; the meteorological data (wind, precipitation, evaporation, etc.) comes from the National Marine Science Data Center network, as shown in Table 1.

[0101] Table 1 Sources of Model Input Data

[0102]

[0103] Based on the relevant literature and monitoring data of the study area and the offshore area, 12 combined simulation scenarios of the inflow and the total nitrogen concentration and are set, as shown in Table 2, to simulate the water quality distribution in the study area and the adjacent offshore waters under different flow rates and total nitrogen inputs to the sea.

[0104] Table 2 Settings of Total Nitrogen Input Conditions in Different Scenarios

[0105]

[0106] Use MatLab to analyze and organize the data of the area of excellent water quality in the offshore area of the research area under different scenarios, and obtain the linear response relationship between the runoff flow of the Yellow River into the sea, the area of excellent water quality in the offshore area, and the concentration of pollutants entering the sea through multiple regression:

[0107] ;

[0108] In the formula represents the proportion of the area of excellent sea areas, is the inflow into the sea, is the total nitrogen concentration entering the sea.

[0109] Based on the current water quality status of the offshore area of the research area from 2017 to 2022, combined with various regulatory documents issued at the present stage, specific goals for the improvement of offshore water quality in three stages are comprehensively proposed: in the near term, by 2025, the annual average proportion of the area of excellent sea areas > 40%, and the proportion of the area of sea areas of inferior to Class IV < 20%; in the medium term, by 2035, according to the classification standard of the regional seawater quality status, the annual average reaches the general sea area category: the annual average proportion of the area of excellent sea areas > 60%, and the proportion of the area of sea areas of inferior to Class IV < 20%; in the long term, by 2050, according to the classification standard of the regional seawater quality status, the annual average reaches the good sea area category: the annual average proportion of the area of excellent sea areas > 79%, and the proportion of the area of sea areas of inferior to Class IV < 10%. Considering the overall improvement of the river-sea water environment, based on the index of the excellent area in the offshore area of the research area, suggestions for the total nitrogen control target at the sea entry section of the research area are initially proposed in Table 3.

[0110] Table 3 Total nitrogen control target at the sea entry section of the research area

[0111]

[0112] In summary, the beneficial effects of the embodiments of the present application are as follows: by constructing a quantitative relationship between the load of land-based pollutants and the water environment management target, the total amount of land-based pollution emissions can be determined based on the self-purification ability and environmental capacity of the offshore area, and the strategy for protecting the ecosystem with the river flowing into the sea as the corridor can be clarified, which is of great significance for the coordinated control of land-sea pollution of offshore water quality.

[0113] In the present application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", and "fixed" should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0114] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or module referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0115] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0116] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for processing pollutant concentration data of runoff into the sea, characterized in that: include: Obtain the runoff flow data and pollutant concentration data of the study area; Construct a nearshore water environment model; Constructing a plurality of simulation scenario combinations according to the runoff flow data and the runoff pollutant concentration data; According to the simulation scenario combination, the water quality distribution of the offshore waters is simulated by the offshore water environment model to obtain simulation data; The simulation data is analyzed by MatLab, and a linear response relationship formula between the runoff flow data, the offshore excellent water quality area data and the runoff pollutant concentration data into the sea is obtained by multiple regression; Obtaining the area ratios of sea areas with different preset water qualities, and obtaining the runoff pollutant concentration threshold of the preset sea area ratios with different water qualities according to the preset sea area ratios with different water qualities, the runoff flow data into the sea, and the linear response relationship formula; The method of obtaining the pollutant concentration threshold of runoff into the sea for the preset water quality sea area ratio according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula includes: When the preset water quality sea area ratio is that the good water quality sea area is not less than the first preset percentage, a first sea runoff pollutant concentration threshold is obtained according to the preset season, the first preset percentage, the sea runoff flow data and the inverse function formula of the linear response relationship; When the proportion of the preset sea area with water quality of Class IV and Class IV or worse does not exceed the second preset percentage, a second sea runoff pollutant concentration threshold is obtained according to the preset season, the second preset percentage, the sea runoff flow data and the inverse function formula of the linear response relationship; When the proportion of the preset water quality sea area is that the area of ​​good water quality sea area is not less than the first preset percentage, and the area of ​​Class IV and Class IV water quality sea areas does not exceed the second preset percentage, the third sea runoff pollutant concentration threshold is obtained according to the preset season, the first preset percentage, the second preset percentage, the sea runoff flow data and the inverse function formula of the linear response relationship.

2. The method for processing pollutant concentration data of runoff into the sea according to claim 1, characterized in that: The construction of the offshore water environment model comprises: Obtaining model boundary data, seafloor topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data and tidal data of the study area; Construct a MIKE3 hydrodynamic module and an ECOLAB water quality module according to the model boundary data, the seafloor topography data, the temperature data, the salinity data, the precipitation evaporation data, the radiation intensity data, and the tidal data; The ECOLAB water quality module is coupled with the MIKE3 hydrodynamic module to obtain a nearshore water environment model.

3. The method for processing pollutant concentration data of runoff into the sea according to claim 1, characterized in that: The linear response relationship formula is: ； ； in, is the percentage of sea area with good water quality, The percentage of sea areas with water quality of Class IV or worse than Class IV, is the runoff flow data into the sea, For the preset season, is the pollutant concentration data of runoff into the sea, is the first function, is the second function; The calculation formula for the first pollutant concentration threshold of runoff into the sea is: ； in, is the first pollutant concentration threshold of runoff into the sea, is the runoff flow data into the sea, For the preset season, is the first preset percentage, for The inverse function of .

4. The method for processing pollutant concentration data of runoff into the sea according to claim 1, characterized in that: The calculation formula for the second pollutant concentration threshold of runoff into the sea is: ； in, is the second pollutant concentration threshold of runoff into the sea, is the runoff flow data into the sea, For the preset season, is the second preset percentage, for The inverse function of .

5. The method for processing pollutant concentration data of runoff into the sea according to claim 1, characterized in that: The calculation formula for the third threshold of pollutant concentration of runoff into the sea is: ； in, is the third pollutant concentration threshold for runoff into the sea, is the runoff flow data into the sea, For the preset season, is the first preset percentage, is the second preset percentage, for The inverse function of for The inverse function of .

6. The method for processing pollutant concentration data of runoff into the sea according to claim 5, characterized in that: The pollutant concentration data of runoff into the sea include total nitrogen concentration.

7. A system for processing pollutant concentration data of runoff into the sea, characterized in that: include: An acquisition module (110) is used to acquire runoff flow data and runoff pollutant concentration data of the study area; A model building module (120) is used to build a nearshore water environment model; A combination construction module (130), used to construct a plurality of simulation scenario combinations according to the runoff flow data and the runoff pollutant concentration data; A simulation module (140) is used to simulate the water quality distribution of the offshore sea area through the offshore sea environment model according to the simulation scenario combination to obtain simulation data; An analysis module (150) is used to analyze the simulation data by using MatLab, and obtain a linear response relationship formula between the runoff flow data, the offshore excellent water quality area data and the runoff pollutant concentration data by multiple regression; A threshold calculation module (160) is used to obtain the area ratios of sea areas with different preset water qualities, and obtain the concentration threshold of pollutants in the runoff into the sea for the preset water quality sea area ratio according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula; The method of obtaining the pollutant concentration threshold of runoff into the sea for the preset water quality sea area ratio according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula includes: When the preset water quality sea area ratio is that the good water quality sea area is not less than the first preset percentage, a first sea runoff pollutant concentration threshold is obtained according to the preset season, the first preset percentage, the sea runoff flow data and the inverse function formula of the linear response relationship; When the proportion of the preset sea area with water quality of Class IV and Class IV or worse does not exceed the second preset percentage, a second sea runoff pollutant concentration threshold is obtained according to the preset season, the second preset percentage, the sea runoff flow data and the inverse function formula of the linear response relationship; When the proportion of the preset water quality sea area is that the area of ​​good water quality sea area is not less than the first preset percentage, and the area of ​​Class IV and Class IV water quality sea areas does not exceed the second preset percentage, the third sea runoff pollutant concentration threshold is obtained according to the preset season, the first preset percentage, the second preset percentage, the sea runoff flow data and the inverse function formula of the linear response relationship.

8. A system for processing pollutant concentration data of runoff into the sea, characterized in that: include: A memory (300) and a processor (400), wherein the memory (300) stores a program or instruction that can be run on the processor (400), and when the processor (400) executes the program or the instruction, the steps of the method for processing pollutant concentration data of runoff into the sea as described in any one of claims 1 to 6 are implemented.

9. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or the instruction is executed by a processor, the steps of the method for processing pollutant concentration data of runoff into the sea as described in any one of claims 1 to 6 are implemented.

Images