Polluted area screening method and related device

Abstract

The invention provides a polluted area screening method and a related device, and relates to the field of water environment pollution. Obtaining a target section needing pollution area analysis, obtaining a target sub-basin where the target section is located, finding out candidate sub-basins located at the upstream of the target sub-basin from the water flow flowing relation, obtaining water pollution parameter information of the candidate sub-basins for each candidate sub-basin, and calculating the pollution area of the target section according to the water pollution parameter information. Calculating the pollution influence degree of the candidate sub-basins on the target sub-basins, determining the maximum assimilative capacity value of the target sub-basins under the condition that the pollution of the target sub-basins does not exceed the standard, and determining the target sub-basins when the pollution of the target sub-basins exceeds the standard according to the pollution influence degree and the maximum assimilative capacity value. According to the method, the candidate sub-basins with the increased pollution proportion to the target sub-basins are screened out from the candidate sub-basins and serve as the reference pollution areas, the purpose of determining the pollution areas of water pollution is achieved, pollution sources can be searched for according to the determined pollution areas, and pollution protection can be carried out in time.

Description

Technical Field

[0001] The present application relates to the field of water environment pollution, and more specifically, to a method for screening polluted areas and related devices. Background Art

[0002] Water pollution refers to the phenomenon that the chemical, physical, biological or radioactive properties of water bodies are changed due to the intervention of certain substances, thereby affecting the effective use of water, endangering human health or damaging the ecological environment.

[0003] Currently, when analyzing water pollution, the concentrations of major pollutants can be simulated, and then based on the comparison between the simulation results and water quality standard data, early warnings can be issued for pollutant concentrations that may exceed the standard.

[0004] However, with the continuous development of water pollution analysis, the demand for water pollution analysis is no longer limited to conducting early warning analysis of pollutant concentrations, but has put forward the need to determine the pollution area of ​​water pollution. Among them, the pollution area refers to the area where the pollution source is located. Therefore, how to determine the pollution area of ​​water pollution is a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0005] In view of this, the present application provides a contaminated area screening method and related devices to solve the problem of urgently needing to determine the contaminated area of ​​water pollution.

[0006] To solve the above technical problems, this application adopts the following technical solutions:

[0007] A contaminated area screening method comprising:

[0008] Obtain the target section for contaminated area analysis;

[0009] Obtaining the target sub-basin where the target section is located, and finding a candidate sub-basin located upstream of the target sub-basin from the water flow relationship;

[0010] For each candidate sub-watershed, obtaining water pollution parameter information of the candidate sub-watershed;

[0011] Calculating the degree of pollution impact of the candidate sub-basin on the target sub-basin using the water pollution parameter information;

[0012] Determine the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard;

[0013] When it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value, candidate sub-basins whose pollution proportion to the target sub-basin increases are screened out from the candidate sub-basins and used as reference pollution areas.

[0014] Optionally, finding a candidate sub-basin located upstream of the target sub-basin from the water flow relationship includes:

[0015] Obtaining a water flow relationship; the water flow relationship includes the flow routes of different water flows in the watershed in corresponding sub-watersheds; the water flow relationship is determined based on the flow relationship of the water flows in adjacent sub-watersheds in the watershed;

[0016] Determining, from the water flow relationship, each sub-basin through which the target water flow at the target section flows before flowing through the target sub-basin;

[0017] Each determined sub-basin is used as a candidate sub-basin located upstream of the target sub-basin.

[0018] Optionally, using the water pollution parameter information, calculating the pollution impact of the candidate sub-basin on the target sub-basin includes:

[0019] Utilizing the water pollution parameter information, calculating the degree of point source pollution impact of the point sources in the candidate sub-basin on the target sub-basin;

[0020] Calculating the degree of non-point source pollution impact of the non-point source in the candidate sub-watershed on the target sub-watershed using the water pollution parameter information;

[0021] The sum of the point source pollution impact degree and the non-point source pollution impact degree is used as the pollution impact degree of the candidate sub-basin on the target sub-basin.

[0022] Optionally, using the water pollution parameter information, calculating the degree of point source pollution impact of the point sources in the candidate sub-watershed on the target sub-watershed includes:

[0023] A calculation formula for obtaining the degree of impact of point source pollution is: ,in, is the impact degree of point source pollution, is the sewage discharge of the candidate sub-basin, is the pollutant concentration in the candidate sub-basin, is the self-purification capacity coefficient when the runoff increases, is the rainfall in the candidate sub-basin, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located between the candidate sub-basin and the target sub-basin where the target section is located, is the flow rate of the target water flow in the candidate sub-basin;

[0024] The water pollution parameter information and the calculation formula for the point source pollution impact degree are used to calculate the point source pollution impact degree of the point sources in the candidate sub-basin on the target sub-basin.

[0025] Optionally, using the water pollution parameter information, calculating the degree of non-point source pollution impact of the non-point source in the candidate sub-watershed on the target sub-watershed includes:

[0026] Using the rainfall of the candidate sub-basin, intermediate parameters are calculated;

[0027] The calculation formula for obtaining the impact degree of non-point source pollution is:

[0028] ,in, is the impact degree of non-point source pollution, is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the set source pollutant concentration for nonpoint sources, is the self-purification capacity coefficient when the runoff increases, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located between the candidate sub-basin and the target sub-basin where the target section is located, is the flow rate of the target water flow in the candidate sub-basin;

[0029] The water pollution parameter information and the calculation formula for the non-point source pollution impact degree are used to calculate the non-point source pollution impact degree of the non-point source in the candidate sub-basin on the target sub-basin.

[0030] Optionally, determining the maximum pollution assimilating capacity of the target sub-basin when the pollution of the target sub-basin does not exceed the standard includes:

[0031] The calculation formula for obtaining the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard is: ;in, is the maximum pollution holding capacity value; is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the base flow rate of the target section, is the target water quality concentration of the target section;

[0032] The calculation formula of the maximum pollution assimilating capacity value is used to calculate the maximum pollution assimilating capacity value of the target sub-basin under the condition that the pollution of the target sub-basin does not exceed the standard.

[0033] Optionally, determining whether the pollution in the target sub-basin exceeds the standard according to the pollution impact degree and the maximum pollution assimilating capacity value includes:

[0034] Calculating the sum of the pollution impact levels of each candidate sub-basin to obtain the total pollution impact level;

[0035] Calculating the ratio of the total pollution impact to the maximum pollution holding capacity;

[0036] When the ratio is greater than a set threshold, it is determined that the pollution in the target sub-basin exceeds the standard.

[0037] Optionally, screening out candidate sub-watersheds whose pollution proportion to the target sub-watershed increases from the candidate sub-watersheds includes:

[0038] For each candidate sub-basin, calculating the proportion of the pollution impact degree of the candidate sub-basin in the total pollution impact degree;

[0039] Determine the changing trend of the proportion in different pollution area analysis periods; sort the analysis periods of different pollution areas by time;

[0040] The candidate sub-basins whose proportion changes show an increasing trend are screened out.

[0041] A contaminated area screening device, comprising:

[0042] The first acquisition module is used to acquire the target section that needs to be analyzed for the contaminated area;

[0043] The second acquisition module is used to acquire the target sub-basin where the target section is located, and find a candidate sub-basin located upstream of the target sub-basin from the water flow relationship;

[0044] A third acquisition module is configured to acquire water pollution parameter information of each candidate sub-watershed;

[0045] a calculation module, configured to calculate the pollution impact degree of the candidate sub-basin on the target sub-basin by using the water pollution parameter information;

[0046] a determination module, configured to determine a maximum pollution assimilating capacity of the target sub-basin when pollution of the target sub-basin does not exceed a standard;

[0047] The screening module is used to screen out candidate sub-basins whose pollution proportion to the target sub-basin increases from the candidate sub-basins when it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value, and use them as reference pollution areas.

[0048] An electronic device comprising at least one processor and a memory connected to the processor, wherein:

[0049] The memory is used to store computer programs;

[0050] The processor is used to execute the computer program so that the electronic device can implement the above-mentioned contaminated area screening method.

[0051] The present application provides a method for screening polluted areas and related devices. In the present application, a target section requiring pollution area analysis is obtained, a target sub-basin where the target section is located is obtained, a candidate sub-basin located upstream of the target sub-basin is found from the water flow relationship, water pollution parameter information of each candidate sub-basin is obtained, the water pollution parameter information is used to calculate the degree of pollution impact of the candidate sub-basin on the target sub-basin, and the maximum pollution assimilating capacity of the target sub-basin is determined when the pollution of the target sub-basin does not exceed the standard. When it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact and the maximum pollution assimilating capacity, candidate sub-basins with an increased pollution proportion to the target sub-basin are screened out from the candidate sub-basins and used as reference pollution areas, thereby achieving the purpose of determining the pollution area of ​​water pollution, and then the pollution source can be found according to the determined pollution area and pollution protection operations can be carried out in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0053] Figure 1 A flow chart of a contaminated area screening method provided in an embodiment of the present application;

[0054] Figure 2 A schematic diagram of a watershed provided in an embodiment of the present application;

[0055] Figure 3 A flowchart of a method for determining a sub-watershed provided in an embodiment of the present application;

[0056] Figure 4 A flowchart of a method for determining the degree of pollution impact provided in an embodiment of the present application;

[0057] Figure 5 A flowchart of a method for screening sub-watersheds provided in an embodiment of the present application;

[0058] Figure 6 A schematic structural diagram of a contaminated area screening device provided in an embodiment of the present application;

[0059] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0061] Water pollution refers to the phenomenon that the chemical, physical, biological or radioactive properties of water bodies are changed due to the intervention of certain substances, thereby affecting the effective use of water, endangering human health or damaging the ecological environment.

[0062] Currently, when analyzing water pollution, the concentrations of major pollutants can be simulated, and then based on the comparison between the simulation results and water quality standard data, early warnings can be issued for pollutant concentrations that may exceed the standard.

[0063] However, with the continuous development of water pollution analysis, the demand for water pollution analysis has expanded beyond simply providing early warning analysis of pollutant concentrations. It now requires identifying the source of water pollution (i.e., the contaminated area). For example, it is necessary to locate areas that negatively impact downstream water quality and implement timely intervention to prevent water quality from deteriorating or even exceeding water quality standards. Therefore, how to determine the contaminated area is a technical problem that technicians in this field urgently need to solve.

[0064] When attempting to identify areas primarily impacted by pollution, thereby providing further support for investigation and intervention, isotopic techniques can be used to trace the source of surface water and the contamination process. Isotopes are atomic forms of the same element with different numbers of neutrons. In natural physical, chemical, and biological processes, isotope fractionation results in differences in isotope ratios between materials from different sources. This difference in ratios can be exploited to identify contaminated areas after an isotope database has been constructed. However, a drawback of this method is its high cost. On the one hand, it requires the procurement of equipment such as spectrometers and spectroscopy for isotope analysis. On the other hand, before tracing the source, many contaminated areas must be analyzed to build an isotope database.

[0065] Therefore, there is a need for a method that can obtain the pollution areas that have the main impact on pollution through data analysis without investing in additional hardware equipment.

[0066] In order to analyze the polluted area, in an embodiment of the present application, the pollution impact contribution ratio of the upstream basin of the section is calculated according to the point source and surface source schemes, and then the changes in this contribution ratio are continuously observed, and the magnitude of this change is used to find the main sub-basin causing the pollution exceeding the standard.

[0067] In specific implementation, the target section that needs to be analyzed for pollution areas is obtained, the target sub-basin where the target section is located is obtained, and the candidate sub-basin located upstream of the target sub-basin is found from the water flow relationship. For each candidate sub-basin, the water pollution parameter information of the candidate sub-basin is obtained. The water pollution parameter information is used to calculate the degree of pollution impact of the candidate sub-basin on the target sub-basin, and the maximum pollution assimilating capacity of the target sub-basin is determined when the pollution of the target sub-basin does not exceed the standard. When it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value, the candidate sub-basins with an increased pollution proportion to the target sub-basin are screened out from the candidate sub-basins and used as reference pollution areas, thereby achieving the purpose of determining the pollution area of ​​water pollution, and then the pollution source can be found according to the determined pollution area and pollution protection operations can be carried out in a timely manner.

[0068] The reference pollution area in the present embodiment is the area where the pollution source is located, specifically the sub-basin, that is, which sub-basin causes the highest degree of pollution to the target section. Furthermore, it is possible to analyze which point source or area source within the sub-basin causes the highest degree of pollution to the target section.

[0069] An embodiment of the present application provides a method for screening contaminated areas. The execution entity may be a controller, processor, cloud, etc. with computing capabilities. In this embodiment, no requirements are made on the execution entity.

[0070] Reference Figure 1, a contaminated area screening method may include:

[0071] S11. Obtain the target section requiring contaminated area analysis.

[0072] Among them, the polluted area refers to the area where the pollution source is located.

[0073] In actual scenarios, refer to Figure 2 , Figure 2 The diagram is a schematic diagram of a watershed. For a watershed, the watershed consists of multiple sub-watersheds, and each sub-watershed can be directly adjacent or indirectly adjacent. Figure 2 The basin in the figure is composed of sub-basins 1-8. The adjacent relationship between each sub-basin can be referred to Figure 2 As shown in , the river channel where the water flows passes through at least one sub-basin, such as Figure 2 The river channels in the sub-basins pass through sub-basins 1, 3, 6 and 8 in sequence.

[0074] The target section refers to a specific section within the basin that is used to analyze and study hydrological and hydraulic characteristics. Figure 2 In the figure, since the river channel is represented by a line, the cross section is represented by a point. The cross section in the actual scene is a surface.

[0075] Cross-sections can be divided into basin outlet sections and basin mid-sections based on location. Cross-sections can be divided into transverse sections and longitudinal sections based on direction. In this embodiment, the target section is the section for polluted area analysis selected based on actual needs. There can be one or more target sections, and their location and direction are not limited.

[0076] S12. Obtain the target sub-basin where the target section is located, and find a candidate sub-basin located upstream of the target sub-basin from the water flow relationship.

[0077] In this embodiment, the target sub-basin where the target section is located refers to the sub-basin to which the target section belongs. Figure 2 For example, the sub-basin where the target section is located is sub-basin 8, that is, sub-basin 8 is the target sub-basin. According to the flow direction, the polluted area of ​​the target sub-basin is the candidate sub-basin located upstream of the target sub-basin. Therefore, it is necessary to determine all candidate sub-basins located upstream of the target sub-basin.

[0078] In one implementation, elevation data from a DEM (Digital Elevation Model) for the corresponding watershed, obtained from open-source data, can be used to divide the watershed into several subbasins and determine the boundaries and drainage structure. Integrating data on land use, soils, meteorology, and pollution sources, each subbasin is further divided into multiple HRUs (Hydrological Response Units). Finally, model parameters are calibrated to complete the construction of the Soil and Water Assessment Tool (SWAT) model for that watershed. The SWAT model, based on physical processes, can simulate multiple processes within a watershed, including the hydrological cycle, soil erosion, and nutrient cycling. It divides the watershed into multiple subbasins, each of which is further divided into different land use and soil types to account for the impact of spatial heterogeneity of the underlying surface on hydrological processes. The SWAT model simulates the hydrological cycle by simulating hydrological processes such as precipitation, interception, evaporation, infiltration, surface runoff, intersoil flow, and subsurface runoff to calculate the water balance within the basin. It also considers the impact of factors such as vegetation growth and soil water movement on the hydrological cycle. In addition to simulating the hydrological cycle, the SWAT model can also simulate soil erosion, the cycling of nutrients such as nitrogen and phosphorus, and the migration and transformation of pesticides. For example, an erosion model calculates the erosion and transport of soil particles, while a chemical transport model simulates the migration and transformation of nutrients and pesticides within the soil-plant-water system.

[0079] In one implementation, the SWAT model includes a fig.fig file, which includes the flow relationship of water flows (also called rivers, etc.) between two adjacent sub-basins, such as water flow A flows from sub-basin 1 to sub-basin 3, water flow A flows from sub-basin 3 to sub-basin 6, water flow A flows from sub-basin 3 to sub-basin 6..., and designs an export script for the flow relationship. The core of the export script for the flow relationship is to deduce the flow routes of different water flows in the corresponding sub-basins in the entire basin through the flow relationship between the two adjacent sub-basins. The flow route is the water flow relationship. In an example, Figure 2 As shown, the water flow relationship can be that the water in the river passes through sub-basins 1, 3, 6 and 8 in sequence.

[0080] After the water flow relationship is known, all sub-basins located upstream of the target sub-basin can be found, and each sub-basin is called a candidate sub-basin.

[0081] S13. For each candidate sub-basin, obtain water pollution parameter information of the candidate sub-basin.

[0082] The water pollution parameter information of the candidate sub-basin may include:

[0083] Wastewater discharge in candidate sub-basins , pollutant concentrations in candidate sub-basins , Self-purification capacity coefficient when runoff increases , rainfall in the candidate sub-basin , Pollutant self-purification correction coefficient The total length of the river where the target water flow is located between the candidate sub-basin and the target sub-basin where the target section is located , the flow rate of the target water flow in the candidate sub-basin , the area of ​​the candidate sub-basin , runoff generated by unit rainfall , set source pollutant concentration of non-point source wait.

[0084] in, It refers to the sum of the wastewater discharge from various sources of polluting factories in the candidate sub-basin. Similarly, It is also the average value of the pollutant concentrations generated by various sources such as factories that produce pollution in the candidate sub-basin. and It can be obtained from the SWAT model corresponding to the watershed. and This is pollution flux data.

[0085] Target water flow velocity in the candidate sub-basin is the design flow rate corresponding to the corresponding sub-basin, and the design flow rate corresponds to the design flow rate of the water functional zone. Among them, the water functional zone refers to the water area that is demarcated according to its dominant function and implements the corresponding water environment quality standards in accordance with the natural conditions and development and utilization status of water resources, in accordance with the comprehensive basin planning, water resources protection planning and economic and social development requirements, in order to meet the needs of rational development, utilization, conservation and protection of water resources. There is a correlation between water functional zones and sub-basins. In a sub-basin, the design flow rate of the water functional zone is the design flow rate corresponding to the sub-basin, that is, the flow rate of the target water flow in the candidate sub-basin. .

[0086] Rainfall in candidate sub-basins The rainfall of the candidate sub-basin in the weather forecast can be obtained by accessing an API (Application Programming Interface) that provides weather forecasts.

[0087] Self-purification capacity coefficient when runoff increases It refers to the coefficient of self-purification capacity when the runoff (river runoff consists of two parts, base flow and surface runoff) increases due to increased rainfall.

[0088] Pollutant self-purification correction factor It refers to the self-purification correction coefficient of pollutants in the river channel in the candidate sub-basin.

[0089] The total length of the river where the target water flow is located between the candidate sub-basin and the target sub-basin where the target section is located and the area of ​​the candidate sub-basin The determination process is as follows: Based on the sub files and riv files of each sub-basin layer of the basin, the sub file contains the information of the sub-basin and the riv file contains the information of the river in the sub-basin. The sub-basin and the river in the sub-basin are located in different layers, and the sub-basin and river are drawn by overlaying the layers. According to the data characteristics of the sub file and riv file, an export script is written to obtain the data from the exported data. and .

[0090] S14. Calculate the degree of pollution impact of the candidate sub-basin on the target sub-basin using the water pollution parameter information.

[0091] The pollution impact degree is the impact of the candidate sub-basin on the target sub-basin in terms of pollution, also known as the pollution impact contribution ratio. The higher the pollution impact degree or pollution impact contribution ratio, the greater the impact of the candidate sub-basin on the target sub-basin in terms of pollution. The lower the pollution impact degree or pollution impact contribution ratio, the smaller the impact of the candidate sub-basin on the target sub-basin in terms of pollution.

[0092] In one implementation, candidate sub-basins are categorized as point sources and non-point sources. Point sources are sources where pollutants are released into the environment from a specific, centralized location, with a well-defined location and a fixed outlet. Non-point sources, also known as non-point sources, are sources where pollutants are dispersed over a larger area without a fixed point of discharge, but instead enter the environment through processes such as precipitation and runoff.

[0093] Therefore, when calculating the pollution impact of the candidate sub-basin on the target sub-basin, the pollution impact of point sources and non-point sources on the target sub-basin can be calculated separately.

[0094] S15. Determine the maximum pollution assimilating capacity of the target sub-basin under the condition that the pollution does not exceed the standard.

[0095] Among them, the maximum pollution assimilating capacity value refers to the maximum pollution impact that the target sub-basin can bear without exceeding the pollution standard.

[0096] The maximum pollution carrying capacity value can be calculated based on some parameters of the target sub-basin.

[0097] S16. When it is determined that the pollution in the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value, the candidate sub-basins whose pollution proportion to the target sub-basin increases are screened out from the candidate sub-basins and used as reference pollution areas.

[0098] In this embodiment, after the pollution impact degree and the maximum pollution assimilating capacity value are known, the relative relationship between the pollution impact degree and the maximum pollution assimilating capacity value can be used to determine whether the pollution of the target sub-basin exceeds the standard. If it exceeds the standard, the candidate sub-basins with an increased proportion of pollution to the target sub-basin are further screened out from the candidate sub-basins and used as reference pollution areas. The reference pollution areas serve as the key analysis direction for subsequent pollution tracing.

[0099] Furthermore, the pollution data of point sources within the reference pollution area can be analyzed to screen out the most polluting point sources for pollution protection. In one implementation, the contribution of each point source to the total pollution in the polluted area can be calculated, and the point source with the largest contribution is the most polluting point source.

[0100] In this embodiment, a target section requiring pollution area analysis is obtained, a target sub-basin where the target section is located is obtained, a candidate sub-basin located upstream of the target sub-basin is found from the water flow relationship, water pollution parameter information of each candidate sub-basin is obtained, the water pollution parameter information is used to calculate the degree of pollution impact of the candidate sub-basin on the target sub-basin, and the maximum pollution assimilating capacity of the target sub-basin is determined when the pollution of the target sub-basin does not exceed the standard. When it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity, candidate sub-basins with an increased pollution proportion to the target sub-basin are screened out from the candidate sub-basins and used as reference pollution areas, thereby achieving the purpose of determining the pollution area of ​​water pollution, and then the pollution source can be found according to the determined pollution area and pollution protection operations can be carried out in a timely manner.

[0101] Based on any of the above embodiments, in one implementation, referring to Figure 3 , find the candidate sub-basins located upstream of the target sub-basin from the water flow relationship, including:

[0102] S21. Obtain water flow relationship.

[0103] Among them, the water flow relationship includes the flow routes of different water flows in the corresponding sub-basins in the basin; the water flow relationship is determined based on the flow relationship of water flows in adjacent sub-basins in the basin.

[0104] The generation process of the water flow relationship is described above.

[0105] S22. Determine, from the water flow relationship, each sub-basin through which the target water flow at the target section flows before flowing through the target sub-basin.

[0106] In this embodiment, according to the flow direction of the target water flow at the target section, each sub-basin that the target water flow flows through before flowing through the target sub-basin can be queried. Figure 2 For example, the target water flow at the target section flows through sub-basins 1, 3, and 6 before flowing through target sub-basin 8.

[0107] S23. Each determined sub-basin is used as a candidate sub-basin located upstream of the target sub-basin.

[0108] According to the above discussion, sub-basins 1, 3 and 6 are the candidate sub-basins located upstream of the target sub-basin in this embodiment.

[0109] In this embodiment, a water flow relationship is pre-constructed, so that the candidate sub-basins located upstream of the target sub-basin can be quickly queried based on the water flow relationship, providing a data basis for subsequent pollution area analysis.

[0110] Based on any of the above embodiments, in one implementation, referring to Figure 4 , using water pollution parameter information, calculate the pollution impact of candidate sub-basins on target sub-basins, which may include:

[0111] S31. Using water pollution parameter information, calculate the degree of point source pollution impact of point sources in the candidate sub-basin on the target sub-basin.

[0112] The impact degree of point source pollution is the degree of pollution impact of point sources in the candidate sub-basin on the target sub-basin.

[0113] In this embodiment, a calculation formula for the degree of point source pollution impact may be pre-configured, so that the degree of point source pollution impact of point sources in the candidate sub-basin on the target sub-basin can be calculated using the calculation formula.

[0114] In one implementation, a calculation formula for the degree of impact of point source pollution can be obtained.

[0115] The calculation formula is: .

[0116] in, is the impact degree of point source pollution, is the sewage discharge of the candidate sub-basin, is the pollutant concentration in the candidate sub-basin, is the self-purification capacity coefficient when the runoff increases, is the rainfall in the candidate sub-basin, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located from the candidate sub-basin to the target sub-basin where the target section is located, is the flow rate of the target water in the candidate sub-basin.

[0117] Point Source Pollution Impact: This is the dependent variable of the formula and represents the degree of pollution impact of point sources in the candidate sub-basin on the target sub-basin where the target section is located. It is a quantitative indicator that takes into account multiple factors. A larger value indicates a more severe pollution impact caused by the candidate sub-basin.

[0118] (Wastewater discharge of candidate sub-basins): In the formula, it is a product and positively correlated with the degree of pollution impact. The greater the wastewater discharge, the greater the total amount of pollutants released into the environment, and the greater the potential for pollution impacts on surrounding areas. For example, an industrial sub-basin with high wastewater discharge is more likely to cause pollution downstream than a sub-basin with lower discharge.

[0119] (pollutant concentrations in candidate sub-basins): Similarly, the product is positively correlated with the degree of pollution impact. High pollutant concentrations mean more pollutants per unit volume of wastewater, resulting in greater environmental pollution after discharge. For example, the discharge of high-concentration heavy metal wastewater is more likely to cause severe pollution.

[0120] Exponential function: This function is used to comprehensively reflect the attenuation of pollution by factors such as self-purification and water flow. The exponential function has a range of (0, +∞) and scales the overall result based on the value of the independent variable.

[0121] (Self-purification capacity related items): Increased rainfall often increases runoff, and the self-purification effects of water flow such as dilution and scouring are enhanced. The value increases, A decrease in the overall value indicates that the impact of pollution is reduced due to enhanced self-purification. For example, after rainfall, the flow of rivers increases, which can carry away more pollutants and reduce the impact of pollution.

[0122] (Water flow related items): It can reflect the residence time of pollutants in the river channel. The longer the residence time, the more time there is for dilution, diffusion and self-purification processes; It refers to the adjustment of the process by combining other factors. A decrease in the value indicates that the impact of pollution is reduced due to water transport and related self-purification processes. For example, in a long, slow-flowing river channel, pollutants have more time to diffuse and be purified.

[0123] In general, the calculation formula for the impact of point source pollution quantifies the pollution impact of point sources in candidate sub-basins by multiplying the sewage discharge volume, pollutant concentration and an index term that comprehensively considers factors such as self-purification and water flow transport, and comprehensively reflects the role of pollution generation, self-purification and transport on pollution impact.

[0124] Then, the degree of point source pollution impact of the point sources in the candidate sub-basin on the target sub-basin is calculated using the water pollution parameter information and the calculation formula of the point source pollution impact degree.

[0125] Specifically, the various parameters used in the calculation formula for the degree of impact of point source pollution are obtained from the water pollution parameter information, and the parameter values ​​of these parameters are substituted into the calculation formula for the degree of impact of point source pollution to obtain the degree of impact of point source pollution of the candidate sub-basin on the target sub-basin.

[0126] S32. Calculate the degree of non-point source pollution impact of the non-point source in the candidate sub-basin on the target sub-basin using the water pollution parameter information.

[0127] Among them, the impact degree of non-point source pollution is the pollution impact degree of non-point sources in the candidate sub-basin on the target sub-basin.

[0128] In this embodiment, the impact degree of non-point source pollution is the same as the impact degree of point source pollution, and is also calculated using corresponding formulas.

[0129] In one implementation, the intermediate parameters may be calculated using the rainfall in the candidate sub-basins.

[0130] Among them, the intermediate parameters are express, The calculation formula is:

[0131]

[0132] in, is the rainfall in the candidate sub-basin, In the calculation formula, the coefficient 1.2 is artificially set. It is based on the statistical analysis of historical data of the sub-basin, relevant experimental results or expert experience, and is used to amplify or adjust the rainfall data to better fit the actual situation or research needs of the sub-basin. The denominator 40 is also a set value. It cooperates with the numerator to further scale the adjusted rainfall data, and finally obtains Through such calculations, the basic data of rainfall is converted into parameters that are more targeted for research and easier to analyze and calculate later. .

[0133] Then, the calculation formula for the impact degree of non-point source pollution is obtained, where the calculation formula is:

[0134] .

[0135] in, is the impact degree of non-point source pollution, is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the set source pollutant concentration for nonpoint sources, is the self-purification capacity coefficient when the runoff increases, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located from the candidate sub-basin to the target sub-basin where the target section is located, is the flow rate of the target water in the candidate sub-basin.

[0136] Non-point source pollution impact: This variable, the dependent variable of the formula, represents another quantitative measure of the impact of non-point sources in the candidate sub-basin on the target sub-basin. This value reflects the strength of the pollution impact, taking into account a variety of factors.

[0137] (Intermediate parameter): This parameter serves as a comprehensive adjustment parameter in the formula, connecting rainfall with other factors. It is correlated with rainfall, indirectly reflecting its impact on watershed characteristics and influencing the final calculation of pollution impact.

[0138] (Area of ​​candidate sub-basin): The larger the candidate sub-basin, the greater the total amount of pollutants likely to be generated, and the wider the impact of rainfall, which amplifies the overall pollution impact. For example, large agricultural sub-basins are affected by rainfall over a large area, potentially generating more non-point source pollution flowing into the target area.

[0139] (Rainfall related items): This part reflects the relationship between rainfall and runoff formation. Determines the efficiency with which rainfall is converted into runoff, Indicates the nonlinear effect of rainfall on runoff. Different The value reflects the difference in rainfall-runoff conversion caused by different sub-basin underlying surface conditions. For example, in sub-basins with good vegetation coverage and strong soil permeability, more rainfall infiltrates. The value may be small; in sub-basins with more hardened ground, rainfall is likely to form surface runoff. The value may be larger.

[0140] (Specified Source Pollutant Concentration for Non-Point Sources): This represents the designated pollutant concentration level for non-point source pollution within the sub-basin. The higher the concentration, the more pollutants are likely to enter the target area through rainfall runoff and other factors, contributing significantly to the pollution impact. For example, high concentrations of fertilizers and pesticides in agricultural non-point sources will have a more pronounced polluting effect when entering the water body through rainfall runoff.

[0141] Exponential function: This function is used to comprehensively reflect the attenuation of pollution by factors such as self-purification and water flow. The exponential function has a range of (0, +∞) and scales the overall result based on the value of the independent variable.

[0142] (Self-purification capacity related items): Increased rainfall often increases runoff, and the self-purification effects of water flow such as dilution and scouring are enhanced. The value increases, A decrease in the overall value indicates that the impact of pollution is reduced due to enhanced self-purification. For example, after rainfall, the flow of rivers increases, which can carry away more pollutants and reduce the impact of pollution.

[0143] (Water flow related items): It can reflect the residence time of pollutants in the river channel. The longer the residence time, the more time there is for dilution, diffusion and self-purification processes; It refers to the adjustment of the process by combining other factors. A decrease in the value indicates that the impact of pollution is reduced due to water transport and related self-purification processes. For example, in a long, slow-flowing river channel, pollutants have more time to diffuse and be purified.

[0144] In general, the calculation formula for the impact of non-point source pollution quantifies the impact of non-point source pollution by comprehensively considering factors such as sub-basin area, rainfall-runoff relationship, non-point source pollutant concentration, self-purification and water flow transport. It comprehensively reflects the pollution impact of non-point sources in the candidate sub-basin on the target sub-basin under the combined effect of multiple conditions.

[0145] Then, the impact of nonpoint source pollution in the candidate sub-basin on the target sub-basin is calculated using the water pollution parameter information and the calculation formula of the nonpoint source pollution impact.

[0146] Specifically, the various parameters used in the calculation formula for the degree of impact of non-point source pollution are obtained from the water pollution parameter information, and the parameter values ​​of these parameters are substituted into the calculation formula for the degree of impact of non-point source pollution to obtain the degree of impact of non-point source pollution of the candidate sub-basin on the target sub-basin.

[0147] S33. The sum of the impact degree of point source pollution and the impact degree of non-point source pollution is used as the pollution impact degree of the candidate sub-basin on the target sub-basin.

[0148] In this embodiment, the pollution impact degree of the candidate sub-basin on the target sub-basin = + .

[0149] In this embodiment, when simulating the pollution situation of the section, the point source and surface source situations of each upstream sub-basin are simulated separately, thereby obtaining not only the prediction and warning of the future water quality situation of the downstream section, but also the proportion of the impact of different upstream sub-basins on the downstream section. That is, the pollution impact of each candidate sub-basin on the target sub-basin where the target section is located can be quantified, thereby providing data support for further pollution tracing.

[0150] Based on any of the above embodiments, in an implementation of the present application, determining the maximum pollution assimilating capacity of the target sub-basin when pollution does not exceed the standard includes:

[0151] Obtain the calculation formula for the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard. Use the calculation formula for the maximum pollution assimilating capacity to calculate the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard.

[0152] In one implementation, the calculation formula is: ;in, is the maximum pollution holding capacity value; is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the base flow rate of the target section, is the target water quality concentration of the target section.

[0153] (Maximum Pollution Assimilating Capacity): As the calculation result of the formula, it represents the maximum extent to which the target sub-basin can accommodate pollutants under specific conditions. It is a key indicator for measuring the environmental carrying capacity of the sub-basin and is used to guide pollution control and management.

[0154] (Rainfall-basin characteristics related terms), The larger the area of ​​the candidate sub-basin, the greater the potential for runoff from rainfall, the greater its ability to dilute pollutants, and the greater the potential for non-point source pollution. In the formula, this factor, along with other factors such as rainfall, reflects the impact of the target sub-basin's size on its pollution assimilation capacity. (Rainfall related items): This part reflects the relationship between rainfall and runoff formation. The value reflects the difference in rainfall-runoff conversion due to the underlying surface conditions of the sub-basin. Heavy rainfall and high runoff conversion efficiency may bring more dilution water and increase the pollution absorption capacity. Multiplying them together takes into account the contribution of rainfall and basin characteristics to pollution assimilating capacity.

[0155] Baseflow (at the target section): Baseflow is the relatively stable portion of a river's flow, independent of recent rainfall. The greater the baseflow, the greater the volume of water in the river, the greater its ability to dilute pollutants and the greater the amount of pollutants it can hold. This value is positively correlated with the maximum pollutant holding capacity.

[0156] Target water quality concentration at the target section: This is the permissible concentration of pollutants in the water quality of the target section, set according to environmental quality standards or management requirements. It determines the amount of pollutants that a unit volume of water can accommodate while still meeting water quality requirements. This value, multiplied by the previous related terms, determines the maximum assimilative capacity of the sub-basin from the perspective of water quality standards. For example, the lower the target water quality concentration, the lower the maximum assimilative capacity of the sub-basin under the same flow conditions.

[0157] When the calculation formula for the maximum pollution assimilating capacity of the target sub-basin is known, the relevant parameters can be substituted into the calculation formula for the maximum pollution assimilating capacity of the target sub-basin to calculate the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard.

[0158] In this embodiment, factors such as rainfall-basin characteristics, baseflow flow, and water quality target concentration are comprehensively considered to calculate the maximum pollution assimilating capacity of the target sub-basin, which fully reflects the impact of the sub-basin's own conditions and water quality requirements on its ability to accommodate pollutants.

[0159] Based on any of the above embodiments, in an implementation of the present application, determining whether the target sub-basin has exceeded the pollution standard based on the pollution impact degree and the maximum pollution assimilating capacity value may include the following steps:

[0160] First, the sum of the pollution impact levels of each candidate sub-basin is calculated to obtain the total pollution impact level.

[0161] Each candidate subbasin has a and , in order to distinguish, the sub-basin 1 and called and , subbasin 3 and called and , subbasin 6 and called and .

[0162] The sum of the pollution impacts of each candidate sub-basin is + + + + + .

[0163] + + + + + The value of is the total degree of pollution impact F.

[0164] Then, calculate the ratio of the total pollution impact to the maximum pollution holding capacity value.

[0165] The ratio is the current risk of exceeding the standard. value, The calculation formula is:

[0166]

[0167] When the ratio is greater than the set threshold, it is determined that the pollution in the target sub-basin exceeds the standard.

[0168] Specifically, if you get The larger the value, the greater the pollution impact of all candidate sub-basins on the target sub-basin. A smaller value indicates that the pollution impact of all candidate sub-basins on the target sub-basin is relatively small.

[0169] In one implementation, The corresponding threshold value is set to 1 or other threshold values ​​set based on experience. In this embodiment, the threshold value is set to 1 as an example. The value is compared with 1. If it is greater than 1, it means that the pollution impact of all candidate sub-basins on the target sub-basin is at risk of exceeding the standard, and the target sub-basin is determined to have exceeded the pollution standard. If it is less than or equal to 1, it means that the pollution impact of all candidate sub-basins on the target sub-basin is not at risk of exceeding the pollution standard.

[0170] In this embodiment, the total pollution impact of all candidate sub-basins is analyzed, and based on the relative relationship between the total pollution impact and the maximum pollution assimilating capacity value, it is determined whether the target sub-basin exceeds the standard, thereby determining the severity of pollution in the target sub-basin.

[0171] Based on any of the above embodiments, in an implementation of this application, refer to Figure 5 , select the candidate sub-basins whose pollution proportion to the target sub-basin increases from the candidate sub-basins, including:

[0172] S41. For each candidate sub-basin, calculate the proportion of the pollution impact degree of the candidate sub-basin in the total pollution impact degree.

[0173] Based on sub-basin 1 for , for For example, the calculation formula for the proportion of the pollution impact degree of sub-basin 1 in the total pollution impact degree is:

[0174] ( + ) / F.

[0175] The calculation formula for the proportion of other sub-basins is similar.

[0176] S42. Determine the changing trend of the proportion in different pollution areas during the analysis period.

[0177] Among them, the analysis periods of different pollution areas are sorted by time.

[0178] The analysis cycles for different pollution areas are sorted by time. Specifically, within each pollution area analysis cycle, the percentage of each candidate sub-basin is obtained. Then, the changing trend of this percentage is plotted in chronological order. There are three types of changing trends: increasing, decreasing, or remaining unchanged. If the changing trend is increasing, it indicates that the pollution impact of the candidate sub-basin on the target sub-basin has increased compared to the pollution impact of other candidate sub-basins on the target sub-basin. This indicates that the pollution of the candidate sub-basin is more serious, and thus the pollution impact on the downstream target sub-basin has increased.

[0179] If the change trend is decreasing, it means that the pollution impact of the candidate sub-basin on the target sub-basin is smaller than the pollution impact of other candidate sub-basins on the target sub-basin, which means that the pollution of the candidate sub-basin has become lighter, thereby reducing the proportion of its pollution impact on the downstream target sub-basin.

[0180] S43. Filter out candidate sub-basins whose proportions have an increasing trend.

[0181] In this embodiment, the candidate sub-basins whose proportion change trend is increasing are screened out, that is, When the pollution ratio is greater than the set threshold, the sub-basin with increased pollution ratio is found. Sub-basins whose pollution proportion increases from being no greater than the set threshold to being greater than the set threshold are the sub-basins whose pollution impact on the downstream target sub-basins gradually becomes heavier, and are also the reference pollution areas for key analysis.

[0182] In this embodiment, a reference polluted area with an increased pollution ratio is determined through ratio analysis, so that the polluted area can be protected more specifically to reduce its pollution impact on the downstream sub-basin.

[0183] Based on the above-mentioned embodiment of the contaminated area screening method, another embodiment of the present application provides a contaminated area screening device, referring to Figure 6 , which may include:

[0184] The first acquisition module 11 is used to acquire the target section for pollution area analysis;

[0185] The second acquisition module 12 is used to obtain the target sub-basin where the target section is located, and find the candidate sub-basin located upstream of the target sub-basin from the water flow relationship;

[0186] The third acquisition module 13 is used to acquire water pollution parameter information of each candidate sub-basin;

[0187] A calculation module 14 is used to calculate the pollution impact of the candidate sub-basin on the target sub-basin using the water pollution parameter information;

[0188] A determination module 15 is used to determine the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard;

[0189] The screening module 16 is used to screen out candidate sub-basins whose pollution proportion to the target sub-basin increases from the candidate sub-basins when it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value, and use them as reference pollution areas.

[0190] In one implementation, the second obtaining module 12 includes:

[0191] The relationship acquisition submodule is used to obtain the flow relationship of water flows; the flow relationship of water flows includes the flow routes of different water flows in the corresponding sub-basins in the basin; the flow relationship of water flows is determined based on the flow relationship of water flows in adjacent sub-basins in the basin;

[0192] The determination submodule is used to determine each sub-basin that the target water flow at the target section flows through before flowing through the target sub-basin from the water flow flow relationship, and use each determined sub-basin as a candidate sub-basin located upstream of the target sub-basin.

[0193] In one implementation, the calculation module 14 includes:

[0194] The first calculation submodule is used to calculate the degree of point source pollution impact of point sources in the candidate sub-basin on the target sub-basin using water pollution parameter information;

[0195] The second calculation submodule is used to calculate the impact of non-point source pollution in the candidate sub-basin on the target sub-basin by using water pollution parameter information;

[0196] The third calculation submodule is configured to take the sum of the impact degree of point source pollution and the impact degree of non-point source pollution as the pollution impact degree of the candidate sub-basin on the target sub-basin.

[0197] In one implementation, the first computing submodule is specifically configured to:

[0198] The calculation formula for the degree of impact of point source pollution is obtained, and the degree of point source pollution impact of the point sources in the candidate sub-basin on the target sub-basin is calculated using the water pollution parameter information and the calculation formula for the degree of impact of point source pollution.

[0199] The calculation formula is: ,in, is the impact degree of point source pollution, is the sewage discharge of the candidate sub-basin, is the pollutant concentration in the candidate sub-basin, is the self-purification capacity coefficient when the runoff increases, is the rainfall in the candidate sub-basin, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located from the candidate sub-basin to the target sub-basin where the target section is located, is the flow rate of the target water in the candidate sub-basin;

[0200] In one implementation, the second calculation submodule is specifically configured to:

[0201] The rainfall in the candidate sub-basin is used to calculate the intermediate parameters and obtain the calculation formula for the impact of non-point source pollution. The water pollution parameter information and the calculation formula for the impact of non-point source pollution are used to calculate the impact of non-point source pollution in the candidate sub-basin on the target sub-basin.

[0202] The calculation formula is:

[0203] ,in, is the impact degree of non-point source pollution, is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the set source pollutant concentration for nonpoint sources, is the self-purification capacity coefficient when the runoff increases, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located from the candidate sub-basin to the target sub-basin where the target section is located, is the flow rate of the target water in the candidate sub-basin.

[0204] In one implementation, the determining module 15 is specifically configured to:

[0205] Obtain the calculation formula for the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard. Use the calculation formula for the maximum pollution assimilating capacity to calculate the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard.

[0206] The calculation formula is: ;in, is the maximum pollution holding capacity value; is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the base flow rate of the target section, is the target water quality concentration of the target section.

[0207] In one implementation, the screening module 16 includes:

[0208] The fourth calculation submodule is used to calculate the sum of the pollution impact levels of each candidate sub-basin to obtain the total pollution impact level;

[0209] A fifth calculation submodule is used to calculate the ratio of the total pollution impact to the maximum pollution holding capacity;

[0210] The exceeding standard determination submodule is used to determine whether the pollution of the target sub-basin exceeds the standard when the ratio is greater than the set threshold.

[0211] In one implementation, the screening module 16 includes:

[0212] a sixth calculation submodule, configured to calculate, for each candidate sub-basin, a proportion of the pollution impact degree of the candidate sub-basin to the total pollution impact degree;

[0213] The trend determination submodule is used to determine the changing trend of the proportion in different pollution area analysis cycles; the analysis cycles of different pollution areas are sorted by time;

[0214] The screening submodule is used to screen out candidate sub-basins whose proportion change trend is an increasing trend.

[0215] In this embodiment, a target section requiring pollution area analysis is obtained, a target sub-basin where the target section is located is obtained, a candidate sub-basin located upstream of the target sub-basin is found from the water flow relationship, water pollution parameter information of each candidate sub-basin is obtained, the water pollution parameter information is used to calculate the degree of pollution impact of the candidate sub-basin on the target sub-basin, and the maximum pollution assimilating capacity of the target sub-basin is determined when the pollution of the target sub-basin does not exceed the standard. When it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity, candidate sub-basins with an increased pollution proportion to the target sub-basin are screened out from the candidate sub-basins and used as reference pollution areas, thereby achieving the purpose of determining the pollution area of ​​water pollution, and then the pollution source can be found according to the determined pollution area and pollution protection operations can be carried out in a timely manner.

[0216] It should be noted that the working process of each module and sub-module in this embodiment can be referred to the corresponding description above and will not be repeated here.

[0217] An embodiment of the present application further provides an electronic device, including at least one processor and a memory connected to the processor, wherein:

[0218] Memory is used to store computer programs;

[0219] The processor is used to execute the computer program so that the electronic device can implement the above-mentioned contaminated area screening method.

[0220] refer to Figure 7 , which shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiments of the present application. The electronic device in the embodiments of the present application may include, but is not limited to, fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 7 The electronic device shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0221] like Figure 7As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 602 or programs loaded from a storage device 608 into a random access memory (RAM) 603. When the electronic device is powered on, the RAM 603 also stores various programs and data required for the operation of the electronic device. The processing device 601, ROM 602, and RAM 603 are interconnected via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0222] Typically, the following devices may be connected to the I / O interface 605: an input device 606 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 608 including, for example, a memory card, a hard disk, etc.; and a communication device 609. The communication device 609 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Figure 7 The electronic device is shown with various devices, but it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed instead.

[0223] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any of the contaminated area screening methods provided in the embodiments of the present application.

[0224] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the contaminated area screening methods provided in the embodiment of the present application.

[0225] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for screening contaminated areas, characterized in that: include: Obtain the target section for contaminated area analysis; Obtaining the target sub-basin where the target section is located, and finding a candidate sub-basin located upstream of the target sub-basin from the water flow relationship; For each candidate sub-watershed, obtaining water pollution parameter information of the candidate sub-watershed; Calculating the degree of pollution impact of the candidate sub-basin on the target sub-basin using the water pollution parameter information; Determine the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard; When it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value, candidate sub-basins whose pollution proportion to the target sub-basin increases are screened out from the candidate sub-basins and used as reference pollution areas.

2. The contaminated area screening method according to claim 1, characterized in that: Finding candidate sub-basins located upstream of the target sub-basin from the water flow relationship includes: Obtaining a water flow relationship; the water flow relationship includes the flow routes of different water flows in the watershed in corresponding sub-watersheds; the water flow relationship is determined based on the flow relationship of the water flows in adjacent sub-watersheds in the watershed; Determining, from the water flow relationship, each sub-basin through which the target water flow at the target section flows before flowing through the target sub-basin; Each determined sub-basin is used as a candidate sub-basin located upstream of the target sub-basin.

3. The contaminated area screening method according to claim 1, characterized in that: Calculating the degree of pollution impact of the candidate sub-basin on the target sub-basin using the water pollution parameter information includes: Utilizing the water pollution parameter information, calculating the degree of point source pollution impact of the point sources in the candidate sub-basin on the target sub-basin; Calculating the degree of non-point source pollution impact of the non-point source in the candidate sub-watershed on the target sub-watershed using the water pollution parameter information; The sum of the point source pollution impact degree and the non-point source pollution impact degree is used as the pollution impact degree of the candidate sub-basin on the target sub-basin.

4. The contaminated area screening method according to claim 3, characterized in that: Calculating the degree of point source pollution impact of the point sources in the candidate sub-watershed on the target sub-watershed using the water pollution parameter information includes: A calculation formula for obtaining the degree of impact of point source pollution is: ,in, is the impact degree of point source pollution, is the sewage discharge of the candidate sub-basin, is the pollutant concentration in the candidate sub-basin, is the self-purification capacity coefficient when the runoff increases, is the rainfall in the candidate sub-basin, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located between the candidate sub-basin and the target sub-basin where the target section is located, is the flow rate of the target water flow in the candidate sub-basin; The water pollution parameter information and the calculation formula for the point source pollution impact degree are used to calculate the point source pollution impact degree of the point sources in the candidate sub-basin on the target sub-basin.

5. The contaminated area screening method according to claim 3, characterized in that: Calculating the degree of non-point source pollution impact of the non-point source in the candidate sub-watershed on the target sub-watershed using the water pollution parameter information includes: Using the rainfall of the candidate sub-basin, intermediate parameters are calculated; The calculation formula for obtaining the impact degree of non-point source pollution is: ,in, is the impact degree of non-point source pollution, is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the set source pollutant concentration for nonpoint sources, is the self-purification capacity coefficient when the runoff increases, is the pollutant self-purification correction coefficient, is the total length of the river where the target water flow is located between the candidate sub-basin and the target sub-basin where the target section is located, is the flow rate of the target water flow in the candidate sub-basin; The water pollution parameter information and the calculation formula for the non-point source pollution impact degree are used to calculate the non-point source pollution impact degree of the non-point source in the candidate sub-basin on the target sub-basin.

6. The contaminated area screening method according to claim 1, characterized in that: Determining the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard includes: The calculation formula for obtaining the maximum pollution assimilating capacity of the target sub-basin when the pollution does not exceed the standard is: ;in, is the maximum pollution holding capacity value; is the intermediate parameter, is the area of ​​the candidate sub-basin, is the rainfall in the candidate sub-basin, is the runoff generated per unit rainfall, is the base flow rate of the target section, is the target water quality concentration of the target section; The calculation formula of the maximum pollution assimilating capacity is used to calculate the maximum pollution assimilating capacity of the target sub-basin under the condition that the pollution of the target sub-basin does not exceed the standard.

7. The contaminated area screening method according to claim 1, characterized in that: Determining whether the pollution in the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value includes: Calculating the sum of the pollution impact levels of each candidate sub-basin to obtain the total pollution impact level; Calculating the ratio of the total pollution impact to the maximum pollution holding capacity; When the ratio is greater than a set threshold, it is determined that the pollution in the target sub-basin exceeds the standard.

8. The contaminated area screening method according to claim 7, characterized in that: Screening out candidate sub-basins whose pollution proportion to the target sub-basin increases from the candidate sub-basins includes: For each candidate sub-basin, calculating the proportion of the pollution impact degree of the candidate sub-basin in the total pollution impact degree; Determine the changing trend of the proportion in different pollution area analysis periods; sort the analysis periods of different pollution areas by time; The candidate sub-basins whose proportion changes show an increasing trend are screened out.

9. A contaminated area screening device, characterized in that: include: The first acquisition module is used to acquire the target section that needs to be analyzed for the contaminated area; The second acquisition module is used to acquire the target sub-basin where the target section is located, and find a candidate sub-basin located upstream of the target sub-basin from the water flow relationship; A third acquisition module is configured to acquire water pollution parameter information of each candidate sub-watershed; a calculation module, configured to calculate the pollution impact degree of the candidate sub-basin on the target sub-basin by using the water pollution parameter information; a determination module, configured to determine a maximum pollution assimilating capacity of the target sub-basin when pollution of the target sub-basin does not exceed a standard; The screening module is used to screen out candidate sub-basins whose pollution proportion to the target sub-basin increases from the candidate sub-basins when it is determined that the pollution of the target sub-basin exceeds the standard based on the pollution impact degree and the maximum pollution assimilating capacity value, and use them as reference pollution areas.

10. An electronic device, characterized in that: comprising at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is configured to execute the computer program so as to enable the electronic device to implement the contaminated area screening method according to any one of claims 1 to 8.

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