Sea runoff pollutant concentration data processing method and system and readable storage medium

Abstract

The invention provides an in-sea runoff pollutant concentration data processing method and system and a readable storage medium, and relates to the technical field of near seawater environment monitoring, and the in-sea runoff pollutant concentration data processing method comprises the steps: obtaining in-sea runoff flow data and in-sea runoff pollutant concentration data of a research area; constructing a near-seawater environment model; simulating the water quality distribution condition of an offshore sea area through a near-seawater environment model according to the simulation scene combination; analyzing the simulation data through MatLab to obtain a linear response relation formula among the sea-entering runoff flow data, the offshore excellent water quality area data and the sea-entering runoff pollutant concentration data; according to the preset water quality sea area proportion, the sea runoff flow data and the linear response relation formula, the sea runoff pollutant concentration threshold value of the preset water quality sea area proportion is obtained. According to the technical scheme, the total terrestrial pollution emission amount can be determined based on the offshore pollution self-cleaning capacity and the environmental capacity.

Description

Technical Field

[0001] The present application relates to the technical field of offshore water environment monitoring, and in particular to a method and system for processing data on pollutant concentration of runoff into the sea, 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 pressure. At present, the governance targets of various river basins and sea areas are not connected, and there are inconsistent water quality assessment indicators and quantitative standards for river sections entering the sea and near the sea, that is, the problem of "lack of coordination between land and sea". Summary of the invention

[0003] The embodiments of the present application aim to at least improve the problem of inconsistent water quality assessment indicators and quantitative standards for river sections entering the sea and near-shore areas.

[0004] To this end, the first purpose of the present application is to provide a method for processing data on pollutant concentrations in runoff into the sea.

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

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

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

[0008] To achieve the first purpose of the present application, the technical solution of the first aspect of the present application provides a method for processing data on pollutant concentration of runoff into the sea, including: obtaining runoff flow data and runoff pollutant concentration data of the study area; constructing a nearshore water environment model; constructing multiple simulation scenario combinations based on the runoff flow data and runoff pollutant concentration data; simulating the water quality distribution of the nearshore waters through the nearshore water environment model according to the simulation scenario combination to obtain simulation data; analyzing the simulation data through MatLab, and obtaining the linear response relationship formula between the runoff flow data, the nearshore excellent water quality area data and the runoff pollutant concentration data through multiple regression; obtaining the area ratio of sea areas with different preset water qualities, and obtaining the runoff pollutant concentration threshold of the preset water quality sea area ratio according to the preset water quality sea area ratio, the runoff flow data and the linear response relationship formula.

[0009] According to the method for processing the concentration data of pollutants in runoff into the sea provided by the present application, firstly, the monitoring data related to the runoff into the sea, i.e., the runoff flow data into the sea and the pollutant concentration data into the sea in the study area, are obtained. Then, a near-shore water environment model is constructed to simulate the hydrodynamics and water environment processes in the study area. Then, a plurality of simulation scenario combinations are constructed according to the runoff flow data into the sea and the pollutant concentration data into the sea. The near-shore water environment model is used to simulate the water quality distribution of the near-shore waters under different flow rates and pollutant concentrations into the sea, and the simulation data is obtained. The simulation data is analyzed by MatLab, and the linear response relationship formula between the runoff flow data into the sea, the near-shore excellent water quality area data and the runoff pollutant concentration data into the sea is obtained by multiple regression. Finally, according to the specific goal of improving the near-shore excellent water quality area, different optimization objective functions are used for different target types, and the runoff pollutant concentration threshold of the preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula. By constructing a quantitative relationship between land-based pollutant loads and water environment management objectives, the total amount of land-based pollution emissions can be determined based on the pollution self-purification capacity and environmental capacity of the nearshore area, and the strategy of protecting ecosystems using rivers entering the sea as corridors can be clarified, which is of great significance for the coordinated control of land and sea water quality pollution in the nearshore area.

[0010] In addition, the technical solution provided by this application may also have the following additional technical features: In some technical solutions, optionally, a nearshore water environment model is constructed, including: obtaining model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data and tidal data of the study area; constructing a MIKE3 hydrodynamic module and an 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; coupling the ECOLAB water quality module with the MIKE3 hydrodynamic module to obtain a nearshore water environment model.

[0011] In this technical solution, a nearshore water environment model is constructed based on the MIKE3 hydrodynamic module and the ECOLAB water quality module. Specifically, the model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data and tide data of the study area are first obtained. Then, the MIKE3 hydrodynamic module and the ECOLAB water quality module are constructed based on the model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data and tide data. Then, the ECOLAB water quality module is coupled with the MIKE3 hydrodynamic module to obtain the nearshore 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. It is coupled with the MIKE3 hydrodynamic module to integrate the convection diffusion transmission mechanism into the water quality simulation.

[0012] In some technical schemes, optionally, the threshold value of pollutant concentration of runoff into the sea for the preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula, including: when the preset water quality sea area ratio is that the area of ​​sea areas with good water quality is not less than the first preset percentage, the first threshold value of pollutant concentration of runoff into the sea is obtained according to the preset season, the first preset percentage, the runoff flow data into the sea and the inverse function formula of the linear response relationship; when the preset water quality sea area ratio is that the area of ​​sea areas with Class IV and Class IV water quality does not exceed the second preset percentage, the second threshold value of pollutant concentration of runoff into the sea is obtained according to the preset season, the second preset percentage, the runoff flow data into the sea and the inverse function formula of the linear response relationship; when the preset water quality sea area ratio is that the area of ​​sea areas with good water quality is not less than the first preset percentage, and the area of ​​sea areas with Class IV and Class IV water quality does not exceed the second preset percentage, the third threshold value of pollutant concentration of runoff into the sea is obtained according to the preset season, the first preset percentage, the second preset percentage, the runoff flow data into the sea and the inverse function formula of the linear response relationship.

[0013] In this technical solution, the threshold of pollutant concentration of runoff into the sea for the preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula. Specifically, when the preset water quality sea area ratio is that the area of ​​the sea area with good water quality is not less than the first preset percentage, the first threshold of pollutant concentration of runoff into the sea is obtained according to the preset season, the first preset percentage, the runoff flow data into the sea 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 Class IV and Class IV inferior water quality does not exceed the second preset percentage, the second threshold of pollutant concentration of runoff into the sea is obtained according to the preset season, the second preset percentage, the runoff flow data into the sea 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 good water quality is not less than the first preset percentage, and the area of ​​the sea area with Class IV and Class IV inferior water quality does not exceed the second preset percentage, the third threshold of pollutant concentration of runoff into the sea is obtained according to the preset season, the first preset percentage, the second preset percentage, the runoff flow data into the sea and the inverse function formula of the linear response relationship. According to the specific goal of improving the offshore area with good water quality, different optimization objective functions are used for different target types to obtain the pollutant concentration thresholds for runoff into the sea.

[0014] In some technical solutions, optionally, 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 .

[0015] In this technical solution, when the preset water quality sea area ratio is not less than Assume that the proportion of sea areas with Class I and Class II water quality corresponding to season T is The corresponding concentration value can be directly calculated based on the response relationship between the concentration of pollutants entering the sea and the water quality of the coastal waters. .

[0016] In some technical solutions, optionally, the calculation formula for the second threshold value of pollutant concentration 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 .

[0017] In this technical solution, the area ratio of the preset water quality sea area is Class IV and Class IV inferior water quality sea area does not exceed Assume that the proportion of sea areas with Class IV and Class IV-lower water quality corresponding to season T is less than , and then the corresponding concentration value can be calculated .

[0018] In some technical solutions, optionally, the calculation formula of the third threshold value of pollutant concentration of runoff into the sea is: ; in, is the third 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, is the second preset percentage, for The inverse function of for The inverse function of .

[0019] In this technical solution, when the preset water quality sea area ratio is not less than , and the area of ​​sea areas with water quality of Class IV and inferior to Class IV shall not exceed At this time, the corresponding concentration threshold takes the smaller value of the two sub-thresholds.

[0020] In some technical solutions, optionally, the pollutant concentration data of runoff into the sea includes total nitrogen concentration.

[0021] In this technical solution, the pollutant concentration data of runoff into the sea includes total nitrogen concentration.

[0022] To achieve the second purpose of the present application, the technical solution of the second aspect of the present application provides a system for processing the concentration data of pollutants in runoff into the sea, including: an acquisition module, used to obtain the runoff flow data and the runoff pollutant concentration data in the study area; a model construction module, used to construct a nearshore water environment model; a combination construction module, used to construct multiple simulation scenario combinations based on the runoff flow data and the runoff pollutant concentration data; a simulation module, used to simulate the water quality distribution status of the nearshore waters through the nearshore water environment model according to the simulation scenario combination to obtain simulation data; an analysis module, used to analyze the simulation data through MatLab, and obtain the linear response relationship formula between the runoff flow data, the nearshore excellent water quality area data and the runoff pollutant concentration data through multiple regression; a threshold calculation module, used to obtain the area ratio of sea areas with different preset water qualities, and obtain the runoff pollutant concentration threshold of the preset water quality sea area ratio according to the preset water quality sea area ratio, the runoff flow data and the linear response relationship formula.

[0023] According to the data processing system for the concentration of pollutants in runoff into the sea 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 obtain the runoff flow data and the runoff pollutant concentration data in the study area. The model construction module is used to build a near-shore water environment model. The combination construction module is used to construct multiple simulation scenario combinations based on the runoff flow data and the runoff pollutant concentration data. The simulation module is used to simulate the water quality distribution of the offshore waters through the near-shore water environment model according to the simulation scenario combination to obtain simulation data. The analysis module is used to analyze the simulation data through MatLab, and multiple regression is used to obtain the linear response relationship formula between the runoff flow data, the offshore excellent water quality area data and the runoff pollutant concentration data. The threshold calculation module is used to obtain the area ratio of different preset water quality sea areas, and obtain the runoff pollutant concentration threshold of the preset water quality sea area ratio according to the preset water quality sea area ratio, the runoff flow data and the linear response relationship formula. By constructing a quantitative relationship between land-based pollutant loads and water environment management objectives, the total amount of land-based pollution emissions can be determined based on the pollution self-purification capacity and environmental capacity of the nearshore area, and the strategy of protecting ecosystems using rivers entering the sea as corridors can be clarified, which is of great significance for the coordinated control of land and sea water quality pollution in the nearshore area.

[0024] To achieve the third purpose of the present application, the technical solution of the third aspect of the present application provides a system for processing data on pollutant concentrations of runoff into the sea, comprising: a memory and a processor, wherein the memory stores programs or instructions that can be run on the processor, and when the processor executes the program or instruction, it implements the method for processing data on pollutant concentrations of runoff into the sea according to any one of the technical solutions of the first aspect, and thus has the technical effect of any one of the technical solutions of the first aspect, which will not be repeated here.

[0025] In order to achieve the fourth purpose 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 the processor, the steps of the method for processing the concentration of pollutants in runoff into the sea of ​​any one of the technical solutions of the first aspect are implemented, and thus the technical effect of any one of the technical solutions of the first aspect is obtained, which will not be repeated here.

[0026] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the steps of a method for processing data of pollutant concentration of runoff into the sea according to an embodiment of the present application; Figure 2 This is a schematic diagram of the steps of a method for processing data of pollutant concentration of runoff into the sea according to an embodiment of the present application; Figure 3 This is a schematic diagram of the steps of a method for processing data of pollutant concentration of runoff into the sea according to an embodiment of the present application; Figure 4 This is a schematic block diagram of the structure of a system for processing pollutant concentration in sea runoff according to an embodiment of the present application; Figure 5 This is a schematic block diagram of the structure of a system for processing pollutant concentration in sea runoff according to an embodiment of the present application; Figure 6 This is a quantitative diagram of total nitrogen input-nearshore water quality response of a method for processing pollutant concentration data of runoff into the sea in one embodiment of the present application.

[0028] in, Figure 4 and Figure 5 The corresponding relationship between the reference numerals and component names in the figure is: 10: Data processing system for pollutant concentration of runoff into the sea; 110: Acquisition module; 120: Model building module; 130: Combination building module; 140: Simulation module; 150: Analysis module; 160: Threshold calculation module; 20: Data processing system for pollutant concentration of runoff into the sea; 300: Memory; 400: Processor. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0031] Refer to the following Figures 1 to 6 Describe the methods and systems for processing data on pollutant concentration in runoff into the sea and readable storage media according to some embodiments of the present application.

[0032] like Figure 1 As shown, the embodiment of the first aspect of the present application provides a method for processing pollutant concentration data of runoff into the sea, comprising the following steps: Step S102: Acquire the runoff flow data and pollutant concentration data of the study area; Step S104: constructing a near-shore water environment model; Step S106: construct multiple simulation scenario combinations according to the runoff flow data and the runoff pollutant concentration data; Step S108: simulating the water quality distribution of offshore waters through the offshore water environment model according to the simulation scenario combination to obtain simulation data; Step S110: Analyze the simulation data through MatLab, and obtain the linear response relationship formula between the runoff flow data into the sea, the offshore excellent water quality area data and the runoff pollutant concentration data into the sea through multiple regression; Step S112: Obtain the area ratios of sea areas with different preset water qualities, and obtain 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, runoff flow data into the sea and a linear response relationship formula.

[0033] According to the method for processing the pollutant concentration data of runoff into the sea provided by the present embodiment, firstly, the monitoring data related to runoff into the sea, i.e., the runoff flow data into the sea and the pollutant concentration data into the sea in the study area are obtained. Then, a near-shore 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, a plurality of simulation scenario combinations are constructed according to the runoff flow data into the sea and the pollutant concentration data into the sea. The near-shore water environment model is used to simulate the water quality distribution of the near-shore waters under different flow rates and the pollutant concentrations into the sea, and the simulation data is obtained. The simulation data is analyzed by MatLab, and the linear response relationship formula between the runoff flow data into the sea, the near-shore excellent water quality area data and the runoff pollutant concentration data into the sea is obtained by multiple regression. Finally, according to the specific goal of improving the near-shore excellent water quality area, for different target types, different optimization objective functions are adopted, and the runoff pollutant concentration threshold of the preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula. By constructing a quantitative relationship between land-based pollutant loads and water environment management objectives, the total amount of land-based pollution emissions can be determined based on the pollution self-purification capacity and environmental capacity of the nearshore area, and the strategy of protecting ecosystems using rivers entering the sea as corridors can be clarified, which is of great significance for the coordinated control of land and sea water quality pollution in the nearshore area.

[0034] 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 offshore. 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 an open numerical laboratory for ecological models and is an aquatic ecosystem model used to describe water quality, eutrophication, heavy metals and ecology.

[0035] like Figure 2 As shown, according to a method for processing pollutant concentration data of runoff into the sea in one embodiment of the present application, a nearshore water environment model is constructed, including the following steps: Step S202: Acquire model boundary data, seafloor topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data and tidal data of the study area; Step S204: constructing a MIKE3 hydrodynamic module and an ECOLAB water quality module according to model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data, and tidal data; Step S206: coupling the ECOLAB water quality module with the MIKE3 hydrodynamic module to obtain a nearshore water environment model.

[0036] In this embodiment, a nearshore water environment model is constructed based on a MIKE3 hydrodynamic module and an ECOLAB water quality module, specifically, firstly obtaining model boundary data, seabed topography data, temperature data, salinity data, precipitation evaporation data, radiation intensity data and tidal data of the study area. Then, a MIKE3 hydrodynamic module and an 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 a nearshore water environment model. Wherein, the MIKE3 hydrodynamic module is based on a three-dimensional incompressible fluid equation and a hydrostatic pressure assumption, and the ECOLAB water quality module is used to describe the conversion process and interaction between chemical variables and ecosystem variables, and is coupled with the MIKE3 hydrodynamic module to integrate the convection diffusion transmission mechanism into the water quality simulation.

[0037] like Figure 3 As shown, according to an embodiment of the present application, a method for processing pollutant concentration data of runoff into the sea is provided, and a runoff pollutant concentration threshold of a preset water quality sea area ratio is obtained according to a preset water quality sea area ratio, runoff flow data into the sea and a linear response relationship formula, which specifically includes the following steps: Step S302: 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; Step S304: when the preset water quality sea area ratio is Class IV and the water quality sea area of ​​Class IV or worse does not exceed the second preset percentage, a second runoff pollutant concentration threshold into the sea is obtained according to the preset season, the second preset percentage, the runoff flow data into the sea and the inverse function formula of the linear response relationship; Step S306: When the preset water quality sea area ratio is that the area of ​​the sea area with good water quality is not less than the first preset percentage, and the area of ​​the sea area with Class IV and Class IV water quality 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.

[0038] In this embodiment, in this technical solution, the threshold of pollutant concentration of runoff into the sea for the preset water quality sea area ratio is obtained according to the preset water quality sea area ratio, the runoff flow data into the sea and the linear response relationship formula. Specifically, when the preset water quality sea area ratio is that the area of ​​the sea area with good water quality is not less than the first preset percentage, the first runoff pollutant concentration threshold for runoff into the sea is obtained according to the preset season, the first preset percentage, the runoff flow data into the sea 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 Class IV and Class IV water quality does not exceed the first preset percentage, the second runoff pollutant concentration threshold for runoff into the sea is obtained according to the preset season, the second preset percentage, the runoff flow data into the sea 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 good water quality is not less than the first preset percentage, and the area of ​​the sea area with Class IV and Class IV water quality does not exceed the second preset percentage, the third runoff pollutant concentration threshold for runoff into the sea is obtained according to the preset season, the first preset percentage, the second preset percentage, the runoff flow data into the sea and the inverse function formula of the linear response relationship. According to the specific goal of improving the offshore area with good water quality, different optimization objective functions are used for different target types to obtain the pollutant concentration thresholds for runoff into the sea.

[0039] In some embodiments, optionally, 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 When the preset water quality sea area ratio is not less than Assume that the proportion of sea areas with Class I and Class II water quality corresponding to season T is The corresponding concentration value can be directly calculated based on the response relationship between the concentration of pollutants entering the sea and the water quality of the coastal waters. .

[0040] In some embodiments, optionally, the calculation formula of the second runoff pollutant concentration threshold 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 the preset water quality sea area ratio is that the area of ​​the fourth category and the inferior fourth category water quality sea area does not exceed Assume that the proportion of sea areas with Class IV and Class IV-lower water quality corresponding to season T is less than , and then the corresponding concentration value can be calculated as .

[0041] In some embodiments, optionally, the calculation formula of the third threshold value of pollutant concentration of runoff into the sea is: ; in, is the third 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, is the second preset percentage, for The inverse function of for The inverse function of the preset water quality sea area ratio is that the area of ​​the sea area with good water quality is not less than , and the area of ​​sea areas with water quality of Class IV and inferior to Class IV shall not exceed At this time, the corresponding concentration threshold takes the smaller value of the two sub-thresholds.

[0042] In some embodiments, optionally, the marine runoff pollutant concentration data includes total nitrogen concentration.

[0043] like Figure 4As shown, an embodiment of the second aspect of the present application provides a system 10 for processing data on runoff pollutant concentration into the sea, including: an acquisition module 110, used to obtain runoff flow data and runoff pollutant concentration data of a study area; a model construction module 120, used to construct 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 into the sea; a simulation module 140, used to simulate the water quality distribution of the offshore waters through the nearshore water environment model according to the simulation scenario combination to obtain simulation data; an analysis module 150, used to analyze the simulation data through MatLab, and obtain a linear response relationship formula between the runoff flow data into the sea, the offshore excellent water quality area data and the runoff pollutant concentration data into the sea through multiple regression; a threshold calculation module 160, used to obtain the area ratio of sea areas with different preset water qualities, and obtain the runoff pollutant concentration threshold of 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.

[0044] According to the data processing system 10 for the concentration of pollutants in runoff into the sea provided in this embodiment, it 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 used to obtain the runoff flow data and the runoff pollutant concentration data in the study area. The model construction module 120 is used to build a near-shore water environment model. The combination construction module 130 is used to construct multiple simulation scenario combinations based on the runoff flow data and the runoff pollutant concentration data. The simulation module 140 is used to simulate the water quality distribution of the offshore waters through the near-shore water environment model according to the simulation scenario combination to obtain simulation data. The analysis module 150 is used to analyze the simulation data through MatLab, and multiple regression is used to obtain the linear response relationship formula between the runoff flow data, the offshore excellent water quality area data and the runoff pollutant concentration data. The threshold calculation module 160 is used to obtain the area ratio of sea areas with different preset water qualities, and obtain 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. By constructing a quantitative relationship between the land-based pollutant load and the water environment management target, the total amount of land-based pollution emissions can be determined based on the pollution self-purification capacity and environmental capacity of the offshore area, and the strategy of protecting the ecosystem with the rivers entering the sea as corridors can be clarified, which is of great significance to the coordinated control of land and sea water quality pollution in the offshore area.

[0045] like Figure 5As shown, an embodiment of the third aspect of the present application provides a system 20 for processing data on pollutant concentration of runoff into the sea, comprising: a memory 300 and a processor 400, wherein the memory 300 stores programs or instructions that can be run on the processor 400, and when the processor 400 executes the program or instruction, it implements the steps of the method for processing data on pollutant concentration of runoff into the sea of ​​any one of the embodiments of the first aspect, and thus has the technical effect of any of the embodiments of the first aspect mentioned above, which will not be repeated here.

[0046] The 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, the steps of the method for processing the concentration of pollutants in runoff into the sea in any one of the embodiments of the first aspect are implemented, and thus the technical effects of any one of the embodiments of the first aspect mentioned above are not repeated here.

[0047] According to a specific embodiment of the present application, a method for processing pollutant concentration data of runoff into the sea includes the following steps: 1. Construct a river channel-nearshore water environment model.

[0048] The offshore 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, and the ECOLAB water quality module is used to describe the transformation process and interaction between chemical variables and ecosystem variables. It is coupled with the MIKE3 hydrodynamic module to integrate the convection-diffusion transport mechanism into the water quality simulation.

[0049] 2. Fit the response relationship between land-based emissions and nearshore water quality distribution.

[0050] Combined with the relevant monitoring data of runoff into the sea, n groups of runoff into the sea were set up and total nitrogen concentration The combined simulation scenario of the coastal water environment model was used to simulate the water quality distribution of the coastal waters under different flow rates and pollutant concentrations entering the sea. MatLab was used to analyze and organize the simulation data, and multiple regression was used to obtain the linear response relationship between the runoff flow into the sea, the area of ​​good offshore water quality, and the pollutant concentration entering the sea.

[0051] 3. Calculate the pollutant concentration threshold for runoff into the sea.

[0052] Taking into account the current status of water quality in the study area and various regulatory documents issued at this stage, the specific goal of improving the area of ​​good water quality in the offshore area is proposed comprehensively. Different optimization objective functions are used for different target types: (1) The area of ​​sea areas with good water quality shall not be less than Assume that the proportion of sea areas with Class I and Class II water quality corresponding to season T is The corresponding concentration value can be directly calculated based on the response relationship between the pollutant flux of the Yellow River into the sea and the water quality of the coastal waters. .

[0053] (1); (2) The area of ​​sea areas with water quality of Class IV or inferior to Class IV shall not exceed Assume that the proportion of sea areas with Class IV and Class IV-lower water quality corresponding to season T is less than , and then the corresponding concentration value can be calculated as .

[0054] (2); (3) The area of ​​sea areas with good water quality shall not be less than , and the area of ​​sea areas with water quality of Class IV and inferior to Class IV shall not exceed At this time, the corresponding concentration threshold takes the smaller value of the two sub-thresholds.

[0055] (3).

[0056] like Figure 6 As shown in the figure, specifically, the boundary information of the nearshore water environment model in the study area was determined by outlining on Google Earth; the seabed topography was derived from the global DEM data published by GEBCO in 2020 in the National Marine Science Data Center network; the initial water temperature field data adopted the climatological monthly average data in ECMWF, and the initial salinity field data adopted the HYCOM mode; the water level data of the tidal boundary was taken from the MIKE tidal boundary; the temperature-salinity boundary data was obtained using HYCOM data; the monthly runoff data of the Lijin hydrological station was used in the study area; the meteorological data (wind, precipitation, evaporation, etc.) came from the National Marine Science Data Center network, as shown in Table 1.

[0057] Table 1 Model input data sources

[0058] Based on relevant literature and monitoring data in the study area and offshore areas, 12 groups of sea discharges were set up. and total nitrogen concentration The combined simulation scenarios, as shown in Table 2, simulate the water quality distribution in the study area and adjacent offshore waters under different flow rates and total nitrogen entering the sea.

[0059] Table 2 Total nitrogen input condition settings for different scenarios

[0060] MatLab was used to analyze and sort out the data of offshore areas with good water quality in the study area under different scenarios, and multiple regression was used to obtain the linear response relationship between the runoff of the Yellow River into the sea, the offshore areas with good water quality, and the concentration of pollutants entering the sea from the Yellow River: ; In the formula Indicates the proportion of good sea areas, is the flow into the sea, is the total nitrogen concentration entering the sea.

[0061] Based on the current status of the water quality in the coastal waters of the study area from 2017 to 2022, combined with the various normative documents issued at this stage, the specific goals of improving the water quality in the coastal waters in three stages are proposed: in the near term, the annual average proportion of good sea areas is greater than 40% in 2025, and the proportion of the inferior four-category sea areas is less than 20%; in the medium term, in 2035, according to the regional seawater quality classification standards, the annual average reaches the general sea area category: the annual average proportion of good sea areas is greater than 60%, and the proportion of the inferior four-category sea areas is less than 20%; in the long term, in 2050, according to the regional seawater quality classification standards, the annual average reaches the good sea area category: the annual average proportion of good sea areas is greater than 79%, and the proportion of the inferior four-category sea areas is less than 10%. Taking into account the overall improvement of the river-coastal water environment, the control target of total nitrogen in the sea section of the study area is initially proposed based on the excellent area index of the coastal waters in the study area, as shown in Table 3.

[0062] Table 3 Total nitrogen control targets at the sea entry section in the study area

[0063] In summary, the beneficial effects of the embodiments of the present application are as follows: by constructing a quantitative relationship between the land-based pollutant load and the water environment management objectives, the total amount of land-based pollution emissions can be determined based on the pollution self-purification capacity and environmental capacity of the nearshore area, and the strategy of protecting the ecosystem using rivers entering the sea as corridors can be clarified, which is of great significance for the coordinated control of land and sea water quality pollution in the nearshore area.

[0064] In this application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0065] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, and therefore, should not be understood as a limitation on the present application.

[0066] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, 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; The area ratios of sea areas with different preset water qualities are obtained, and the pollutant concentration threshold of runoff into the sea for the preset area ratios of sea areas with different water qualities is obtained according to the preset area ratios of sea areas with different water qualities, the runoff flow data into the sea and the linear response relationship formula.

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 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.

4. The method for processing pollutant concentration data of runoff into the sea according to claim 3 is 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 .

5. The method for processing pollutant concentration data of runoff into the sea according to claim 3 is 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 .

6. The method for processing pollutant concentration data of runoff into the sea according to claim 3 is 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 .

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

8. 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; The threshold calculation module (160) is used to obtain the area ratios of sea areas with different preset water qualities, and obtain the pollutant concentration threshold of 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.

9. A data processing system for pollutant concentration 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 7 are implemented.

10. 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 7 are implemented.

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