A risk assessment method for sudden basin water environment of a hazardous chemical production enterprise

Abstract

The application discloses the technical field of environmental risk monitoring and relates to a risk assessment method for sudden basin water environment of a hazardous chemical production enterprise, which establishes a network-based risk assessment system, acquires enterprise hazardous chemical storage information in a unit area of an area where the enterprise is located and water environment information of a basin where the enterprise is located through a basic information acquisition module, acquires other enterprise information in the unit area of the area where the enterprise is located through an environmental information acquisition module, establishes an environmental leakage model through a model construction module, marks each evaluation block in the environmental leakage model based on a pre-planned driving route through an environmental risk grade assessment module, and re-evaluates the environmental risk grade of each evaluation block in the environmental leakage model based on the basin water environment information and other enterprise information, so that the risk assessment analysis of the hazardous chemical transportation line can be provided, the hazardous chemical leakage treatment can be simulated, and the hazardous chemical transportation line can be optimized.

Description

Technical Field

[0001] This invention belongs to the field of environmental risk monitoring technology, specifically a risk assessment method for sudden watershed water environment of hazardous chemical production enterprises. Background Technology

[0002] Hazardous chemicals, also known as hazardous materials, refer to highly toxic chemicals and other chemicals that possess properties such as toxicity, corrosiveness, explosiveness, flammability, and oxidizing properties, posing a threat to human health, facilities, and the environment. With my country's continuous development, the demand for hazardous chemicals is gradually increasing, and their production and transportation are becoming more frequent. Due to the inherent characteristics of hazardous chemicals, it is necessary to analyze the transportation risks during the transportation process to reduce the accident rate and the degree of environmental harm in the event of an accident.

[0003] For example, Chinese patent publication number CN109993400A discloses a method and system for assessing ecological environmental risks in the road transportation of hazardous chemicals. It adopts the ecological environmental sensitive receptor impact derivation method, uses ecological environmental sensitive receptors as the assessment basis, and screens and classifies environmental risk road sections based on the degree of impact of hazardous chemical leaks on environmental sensitive receptors. Based on the provided hazardous chemical transportation routes, it identifies several environmental risk road sections, and then conducts environmental risk assessment and environmental risk level classification for each road section, which serves as an auxiliary decision-making basis for finally determining the hazardous chemical transportation route plan.

[0004] However, this scheme is based on ecological environmental sensitive receptors as the assessment basis, and analyzes the impact of hazardous chemical leaks on environmental sensitive receptors. It ignores the impact of the surrounding environment on hazardous chemicals, and the determination of hazardous chemical transportation routes may have certain deviations. In the event of a hazardous chemical leak, it cannot provide auxiliary decision-making for hazardous chemical leak handling or reduce the degree of harm to the environment caused by the leak. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a risk assessment method for sudden watershed water environment incidents involving hazardous chemical production enterprises. This method enables the assessment and analysis of hazardous chemical transportation routes, and also allows for the simulation of hazardous chemical spill handling, facilitating the optimization of hazardous chemical transportation routes.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A risk assessment method for a hazardous chemical production enterprise in case of a sudden watershed water environment includes the following steps: S1. Establish a network-based risk assessment system, and set up a basic information acquisition module in the risk assessment system to acquire information on the storage of hazardous chemicals by the enterprise within a unit area of ​​the enterprise's location and information on the watershed water environment of the enterprise's location. The hazardous chemical storage information of the enterprise includes the type and quantity of hazardous chemicals stored.

[0008] S2. Set up an environmental information acquisition module in the risk assessment system to acquire information on other enterprises within a unit area of ​​the enterprise's location. The information on other enterprises includes the distribution of enterprises and the number of enterprises.

[0009] S3. Set up a model building module and an information processing module in the risk assessment system. The model building module establishes an environmental leakage model based on the enterprise's hazardous chemical storage information and watershed water environment information. The environmental leakage models containing different hazardous chemicals are named M1, M2, ..., Mn respectively. The environmental leakage model is divided into several assessment blocks with consistent unit distance. The assessment block containing watershed water environment information is marked as A.

[0010] The model building module obtains the transportation locations and types of hazardous chemicals, imports them into the environmental leakage model, and obtains the pre-planned driving routes. The evaluation block containing the pre-planned driving routes is marked as L.

[0011] The information processing module transforms other companies' information into data, imports the transformed information into the environmental leakage model, and marks the evaluation block containing other companies' information as B.

[0012] S4. Set up an environmental risk level assessment module and a hazard early warning module within the risk assessment system. Environmental risk level assessment module;

[0013] The assessment process of the environmental risk level assessment module includes the following steps: S4.1, according to the different types of hazardous chemicals transported, obtain the corresponding Mn in the model construction module, divide the pre-planned driving route into several small segments, and mark the assessment blocks containing the small segments as L1, L2, ..., Ln, calculate the interval distance C between Ln and assessment blocks of different distances, compare the interval distance C with the set thresholds Y1 and Y2, Y1 is less than Y2; temporarily mark each assessment block in the environmental leakage model as red, yellow or green respectively;

[0014] S4.2 The environmental risk level assessment module then compares the green and yellow assessment blocks with A and B;

[0015] S4.2.1 If the green assessment block is A, determine whether A is located upstream or downstream of Ln based on the water flow direction of the watershed water environment information; then, based on the diffusion rate V1 of hazardous chemicals in water and the water flow rate V2, re-mark the green assessment block.

[0016] S4.2.2 If the green evaluation block is B, re-mark the green evaluation block according to the enterprise type of B;

[0017] S4.2.3 If the yellow assessment block is A, determine whether A is located upstream or downstream of Ln based on the water flow direction of the watershed water environment information; then, based on the diffusion rate V1 of hazardous chemicals in water and the water flow rate V2, remark the yellow assessment block.

[0018] S4.2.4 If the yellow evaluation block is B, re-mark the yellow evaluation block according to the enterprise type of B;

[0019] S4.3, the hidden danger early warning module, based on the markings of each evaluation block in Mn, counts the number of markings of each evaluation block in Mn, calculates the number of red marked blocks D1 and the number of yellow marked blocks D2, takes the average of the red marked blocks in each Mn, takes the average of the yellow marked blocks in each Mn, takes the average of D1 and D2 in each Mn, compares the average with the threshold Y4, and issues a warning based on the result.

[0020] The above scheme has achieved the following beneficial effects: the basic information acquisition module obtains information on the storage of hazardous chemicals by the enterprise within a unit area of ​​the enterprise's location and the water environment information of the watershed where the enterprise is located; the environmental information acquisition module obtains information on other enterprises within a unit area of ​​the enterprise's location; and the established environmental leakage model can provide a basic framework for the understanding and execution of subsequent schemes, which is convenient for the subsequent evaluation of the comprehensive environmental risk level of mobile risk sources in a region.

[0021] The environmental leakage model is divided into several evaluation blocks with consistent unit distances, which facilitates the subsequent calculation of various distances and the establishment of the final model. In the event of a hazardous chemical leakage, the degree of environmental harm can be displayed intuitively, providing auxiliary decision-making for hazardous chemical leakage handling and enabling decision-makers to optimize hazardous chemical transportation routes.

[0022] The pre-planned driving route is divided into Ln, and Ln is used as the leakage point. This makes it easier to observe the degree of harm to each assessment block after a hazardous chemical leakage in the environmental leakage model. This helps to improve the level of environmental emergency response and reduce the degree of harm and treatment costs of environmental incidents. The hazard warning module issues warnings to the hazardous chemical transportation route, reducing the need for manual judgment of the hazardous chemical transportation route and making it more scientific and objective to further optimize the hazardous chemical transportation route.

[0023] Furthermore, the environmental leakage model uses the area per unit area of ​​the enterprise's location as its basic framework.

[0024] Beneficial effects: It facilitates the provision of a foundation for environmental leakage models and makes it easy to establish evaluation blocks with consistent unit distances.

[0025] Furthermore, in S4.1, if the interval distance C is greater than Y2, the environmental risk level of the assessment block is safe, and the corresponding assessment block in the environmental leakage model is temporarily marked as green;

[0026] If the interval distance C is greater than Y1 and less than Y2, the environmental risk level of the assessment block is medium, and the corresponding assessment block in the environmental leakage model is temporarily marked in yellow.

[0027] If the interval distance C is less than Y1, the environmental risk level of the assessment block is classified as hazardous, and the corresponding assessment block in the environmental leakage model is temporarily marked in red.

[0028] Beneficial effects: The evaluation blocks are marked with different colors to indicate the different positions of each evaluation block from the leakage point, which can provide a basis for the establishment of environmental leakage models and facilitate the subsequent differentiation and representation of special feature blocks.

[0029] Furthermore, in S4.2.1, if A is located upstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in water and the water flow velocity V2, if the diffusion velocity V1 is greater than the water flow velocity V2, within one minute, the hazardous chemical travel distance C1 = 60 * (V1 - V2) is used. If C1 is greater than or equal to C, the evaluation block is marked in red. If C1 is less than C, the hazardous chemical travel distance C2 = C1 - C is calculated. C2 is compared with the threshold Y3. If C2 is greater than or equal to the threshold Y3, the evaluation block is marked in yellow. If C2 is less than the threshold Y3, the evaluation block is marked in green. If the diffusion velocity V1 in water is less than or equal to the water flow velocity V2, the evaluation block is marked in green.

[0030] If A is located downstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in the water and the flow velocity V2 of the water, within one minute, the hazardous chemical travel distance C3 = 60*(V1+V2) is used. If C3 is greater than or equal to C, the evaluation block is marked in red; if C1 is less than C, the evaluation block is marked in yellow.

[0031] Furthermore, in S4.2.2, if B is a company with a significant environmental risk, the assessment block is marked with yellow and a yellow dot; if B is a company with a moderate environmental risk, the assessment block is marked with green and a yellow dot.

[0032] Furthermore, in S4.2.3, if A is located upstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in water and the water flow velocity V2, if the diffusion velocity V1 is greater than the water flow velocity V2, within one minute, the hazardous chemical travel distance C1 = 60 * (V1 - V2) is used. If C1 is greater than or equal to C, the evaluation block is marked in red. If C1 is less than C, the hazardous chemical travel distance C2 = C1 - C is calculated. C2 is compared with the threshold Y3. If C2 is greater than or equal to the threshold Y3, the evaluation block is marked in yellow with a red dot. If C2 is less than the threshold Y3, the evaluation block is marked in yellow. If the diffusion velocity V1 is less than or equal to the water flow velocity V2, the evaluation block is marked in yellow.

[0033] If A is located downstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in the water and the flow velocity V2 of the water, within one minute, the hazardous chemical movement distance C3 = 60*(V1+V2) is used. If C3 is greater than or equal to C, the evaluation block is marked in red. If C1 is less than C, the evaluation block is marked in yellow with a red dot.

[0034] Furthermore, in S4.2.4, if B is a company with a significant environmental risk, the assessment block is marked with a red dot and a yellow dot; if B is a company with a moderate environmental risk, the assessment block is marked with a yellow dot and a yellow dot.

[0035] Beneficial effects: It facilitates the differentiation and display of A or B in different locations, facilitates the establishment of environmental leakage models, and provides auxiliary decision-making for optimizing hazardous chemical transportation routes.

[0036] Furthermore, in S4.3, based on the number of red marked blocks D1 and the number of yellow marked blocks D2, the total number of abnormal marked blocks dn = D1 + D2 is calculated. The average value of the sum of the red marked blocks Mn is taken as D1′, and the average value of the sum of the yellow marked blocks Mn is taken as D2′. The average value d corresponding to each Mn is then calculated. 平 = (d1+d2+...dn) / n, if D1′ is greater than or equal to D2′, d 平 If Y4 is greater than or equal to Y4, the hazard warning module issues a level one warning. 平 If the value is less than Y4, the hazard warning module issues a level two warning.

[0037] If D1′ is less than D2′, d 平 If Y4 is greater than or equal to Y4, the hazard warning module issues a level two warning. 平 If the value is less than Y4, the hazard warning module will issue a level three warning.

[0038] Beneficial effects: The hazard warning module issues different alerts based on the hazardous chemical transportation route, making it easier for decision-makers to confirm leaks occurring along these routes. Attached Figure Description

[0039] Figure 1 This is a flowchart illustrating the risk assessment method according to an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram of the risk assessment system of the risk assessment method according to an embodiment of the present invention.

[0041] Figure 3 This is a schematic diagram of the environmental leakage model of the risk assessment method according to an embodiment of the present invention. Detailed Implementation

[0042] The following detailed description illustrates the specific implementation method:

[0043] The reference numerals in the accompanying drawings include: Environmental Leakage Model 1, Assessment Block 11, Pre-planned Driving Route 2, Watershed Water Environment Information 3, Other Enterprise Information 4.

[0044] The basic implementation examples are as follows: Figure 1 To be continued Figure 3 As shown: A risk assessment method for a sudden watershed water environment of a hazardous chemical production enterprise, including the following steps: S1. Establish a network-based risk assessment system, and set up a basic information acquisition module in the risk assessment system to acquire information on the storage of hazardous chemicals by the enterprise within a unit area of ​​the enterprise's location and information on the watershed water environment of the enterprise's location. 3. The hazardous chemical storage information of the enterprise includes the type and quantity of hazardous chemicals stored.

[0045] S2. Set up an environmental information acquisition module in the risk assessment system to acquire information 4 of other enterprises within a unit area of ​​the enterprise's location. The information 4 of other enterprises includes the distribution of enterprises and the number of enterprises.

[0046] S3. Set up a model building module and an information processing module in the risk assessment system. The model building module establishes an environmental leakage model 1 based on the enterprise's hazardous chemical storage information and watershed water environment information 3. The environmental leakage model 1 uses the unit area of ​​the enterprise's location as the basic framework. The environmental leakage models 1 containing different hazardous chemicals are named M1, M2, ..., Mn respectively. The environmental leakage model 1 is divided into several evaluation blocks 11 with consistent unit distance. The evaluation block 11 containing watershed water environment information 3 is marked as A.

[0047] The model building module obtains the transportation location and type of hazardous chemicals, imports them into the environmental leakage model 1, and obtains the pre-planned driving route 2. The evaluation block 11 containing the pre-planned driving route 2 is marked as L.

[0048] The information processing module converts the other enterprise information 4 into data, imports the converted other enterprise information 4 into the environmental leakage model 1, and marks the evaluation block 11 containing the other enterprise information 4 as B;

[0049] S4. Set up an environmental risk level assessment module and a hazard early warning module within the risk assessment system. Environmental risk level assessment module;

[0050] The assessment process of the environmental risk level assessment module includes the following steps: S4.1, according to the different types of hazardous chemicals transported, obtain the corresponding Mn in the model construction module, divide the pre-planned driving route 2 into several small segments, and mark the assessment blocks 11 containing the small segments as L1, L2, ..., Ln, calculate the interval distance C between Ln (simulated leak point) and different assessment blocks 11, and compare the interval distance C with the set thresholds Y1 and Y2, where Y1 is less than Y2;

[0051] If the interval distance C is greater than Y2, the environmental risk level of the assessment block 11 is safe, and the corresponding assessment block 11 in the environmental leakage model 1 is temporarily marked as green.

[0052] If the interval distance C is greater than Y1 and less than Y2, the environmental risk level of the assessment block 11 is medium, and the corresponding assessment block 11 in the environmental leakage model 1 is temporarily marked as yellow.

[0053] If the interval distance C is less than Y1, the environmental risk level of the assessment block 11 is dangerous, and the corresponding assessment block 11 in the environmental leakage model 1 is temporarily marked in red;

[0054] S4.2 The environmental risk level assessment module then compares the green and yellow assessment blocks 11 with A and B;

[0055] S4.2.1 If the green evaluation block 11 is A, determine whether A is located upstream or downstream of Ln based on the water flow direction of the watershed water environment information 3.

[0056] If A is located upstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in water and the water flow velocity V2, if the diffusion velocity V1 is greater than the water flow velocity V2, within one minute, the hazardous chemical travel distance C1 = 60 * (V1 - V2) is used. If C1 is greater than or equal to C, the evaluation block 11 is marked in red. If C1 is less than C, the hazardous chemical travel distance C2 = C1 - C is calculated. C2 is compared with the threshold Y3. If C2 is greater than or equal to the threshold Y3, the evaluation block 11 is marked in yellow. If C2 is less than the threshold Y3, the evaluation block 11 is marked in green. If the diffusion velocity V1 is less than or equal to the water flow velocity V2, the evaluation block 11 is marked in green.

[0057] If A is located downstream of Ln, based on the diffusion speed of the hazardous chemical in the water V1 and the water flow speed V2, within one minute, the hazardous chemical movement distance C3 = 60*(V1+V2) is used. If C3 is greater than or equal to C, the evaluation block 11 is marked in red; if C1 is less than C, the evaluation block 11 is marked in yellow.

[0058] S4.2.2 If the green assessment block 11 is B, depending on the enterprise type of B, if B is an enterprise with a greater environmental risk, the assessment block 11 is marked as yellow with a yellow dot; if B is an enterprise with a general environmental risk, the assessment block 11 is marked as green with a yellow dot.

[0059] S4.2.3 If the yellow evaluation block 11 is A, determine whether A is located upstream or downstream of Ln based on the water flow direction of the watershed water environment information 3.

[0060] If A is located upstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in water and the water flow velocity V2, if the diffusion velocity V1 is greater than the water flow velocity V2, within one minute, the hazardous chemical travel distance C1 = 60 * (V1 - V2) is used. If C1 is greater than or equal to C, the evaluation block 11 is marked in red. If C1 is less than C, the hazardous chemical travel distance C2 = C1 - C is calculated. C2 is compared with the threshold Y3. If C2 is greater than or equal to the threshold Y3, the evaluation block 11 is marked in yellow with a red dot. If C2 is less than the threshold Y3, the evaluation block 11 is marked in yellow. If the diffusion velocity V1 is less than or equal to the water flow velocity V2, the evaluation block 11 is marked in yellow.

[0061] If A is located downstream of Ln, based on the diffusion speed of the hazardous chemical in the water V1 and the water flow speed V2, within one minute, the hazardous chemical movement distance C3 = 60*(V1+V2) is used. If C3 is greater than or equal to C, the evaluation block 11 is marked in red. If C1 is less than C, the evaluation block 11 is marked in yellow with a red dot.

[0062] S4.2.4 If the yellow assessment block 11 is B, depending on the enterprise type of B, if B is an enterprise with a greater environmental risk, the assessment block 11 is marked with red and yellow dots; if B is an enterprise with a general environmental risk, the assessment block 11 is marked with yellow and yellow dots.

[0063] S4.3 Hazard Early Warning Module: Based on the markings of each evaluation block 11 in Mn, count the number of markings for each evaluation block 11 in Mn, calculate the number of red marked blocks D1 and the number of yellow marked blocks D2, and based on the number of red marked blocks D1 and the number of yellow marked blocks D2, calculate the total number of abnormal marked blocks dn = D1 + D2. Take the average value D1′ of the red marked blocks in each Mn, and the average value D2′ of the yellow marked blocks in each Mn, and calculate the corresponding average value d for each Mn. 平 = (d1+d2+...dn) / n, if D1′ is greater than or equal to D2′, d 平 If Y4 is greater than or equal to Y4, the hazard warning module issues a level one warning. 平 If the value is less than Y4, the hazard warning module issues a level two warning.

[0064] If D1′ is less than D2′, d 平 If Y4 is greater than or equal to Y4, the hazard warning module issues a level two warning. 平 If the value is less than Y4, the hazard warning module will issue a level three warning.

[0065] Through the above process, in S1 to S2, the basic information acquisition module obtains information on the storage of hazardous chemicals by the enterprise within a unit area of ​​the enterprise's location and the water environment information of the watershed where the enterprise is located. The environmental information acquisition module obtains information on other enterprises within a unit area of ​​the enterprise's location. The established environmental leakage model can provide a basic framework for understanding and implementing subsequent plans, and facilitates the subsequent evaluation of the comprehensive environmental risk level of mobile risk sources in a region.

[0066] In S3 to S4, the environmental leakage model is divided into several evaluation blocks with consistent unit distances, which facilitates the subsequent calculation of various distances and the establishment of the final model. In the event of a hazardous chemical leak, the degree of environmental harm is displayed intuitively, providing auxiliary decision-making for hazardous chemical leak handling, so as to help decision-makers optimize hazardous chemical transportation routes.

[0067] Dividing the pre-planned driving route into Ln and using Ln as the leak point makes it easier to observe the degree of harm to each assessment block after a hazardous chemical leak in the environmental leak model. This helps to improve the level of environmental emergency response and reduce the degree of harm and treatment costs of environmental incidents.

[0068] Sections S4.2.1 to S4.2.4 facilitate the differentiation of A or B at different locations, enabling the establishment of environmental leakage models and providing auxiliary decision-making support for optimizing hazardous chemical transportation routes.

[0069] In S4.3, the hazard warning module issues warnings for hazardous chemical transport routes, reducing manual judgment of hazardous chemical transport routes and making it easier to further optimize hazardous chemical transport routes through scientific and objective assessment.

[0070] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific structures and / or characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A risk assessment method for sudden watershed water environment issues at hazardous chemical production enterprises, characterized in that: Includes the following steps, S1. Establish a network-based risk assessment system, and set up a basic information acquisition module in the risk assessment system to acquire information on the storage of hazardous chemicals by the enterprise within a unit area of ​​the enterprise's location and the water environment information of the watershed where the enterprise is located. The information on the storage of hazardous chemicals by the enterprise includes the type and quantity of hazardous chemicals stored. S2. Set up an environmental information acquisition module in the risk assessment system to acquire information on other enterprises within a unit area of ​​the enterprise's location. The information on other enterprises includes the distribution of enterprises and the number of enterprises. S3. Set up a model building module and an information processing module in the risk assessment system. The model building module establishes an environmental leakage model based on the enterprise's hazardous chemical storage information and watershed water environment information. The environmental leakage models containing different hazardous chemicals are named M1, M2, ..., Mn respectively. The environmental leakage model is divided into several assessment blocks with consistent unit distance. The assessment block containing watershed water environment information is marked as A. The model building module obtains the transportation locations and types of hazardous chemicals, imports them into the environmental leakage model, and obtains the pre-planned driving routes. The evaluation block containing the pre-planned driving routes is marked as L. The information processing module transforms other companies' information into data, imports the transformed information into the environmental leakage model, and marks the evaluation block containing other companies' information as B. S4. Set up an environmental risk level assessment module and a hazard early warning module within the risk assessment system. Environmental risk level assessment module; The assessment process of the environmental risk level assessment module includes the following steps: S4.1, according to the different types of hazardous chemicals transported, obtain the corresponding Mn in the model construction module, divide the pre-planned driving route into several small segments, and mark the assessment blocks containing the small segments as L1, L2, ..., Ln, calculate the interval distance C between Ln and assessment blocks of different distances, compare the interval distance C with the set thresholds Y1 and Y2, Y1 is less than Y2; temporarily mark each assessment block in the environmental leakage model as red, yellow or green respectively; S4.2 The environmental risk level assessment module then compares the green and yellow assessment blocks with A and B; S4.2.1 If the green assessment block is A, determine whether A is located upstream or downstream of Ln based on the water flow direction of the watershed water environment information; then, based on the diffusion rate V1 of hazardous chemicals in water and the water flow rate V2, re-mark the green assessment block. S4.2.2 If the green evaluation block is B, re-mark the green evaluation block according to the enterprise type of B; S4.2.3 If the yellow assessment block is A, determine whether A is located upstream or downstream of Ln based on the water flow direction of the watershed water environment information; then, based on the diffusion rate V1 of hazardous chemicals in water and the water flow rate V2, remark the yellow assessment block. S4.2.4 If the yellow evaluation block is B, re-mark the yellow evaluation block according to the enterprise type of B; S4.3, the hidden danger early warning module, based on the markings of each evaluation block in Mn, counts the number of markings of each evaluation block in Mn, calculates the number of red marked blocks D1 and the number of yellow marked blocks D2, takes the average of the red marked blocks in each Mn, takes the average of the yellow marked blocks in each Mn, takes the average of D1 and D2 in each Mn, compares the average with the threshold Y4, and issues a warning based on the result.

2. The risk assessment method for sudden watershed water environment issues in hazardous chemical production enterprises according to claim 1, characterized in that: The environmental leakage model uses the area per unit area of ​​the enterprise's location as its basic framework.

3. The risk assessment method for sudden watershed water environment issues in hazardous chemical production enterprises according to claim 1, characterized in that: In S4.1, if the interval distance C is greater than Y2, the environmental risk level of the assessment block is safe, and the corresponding assessment block in the environmental leakage model is temporarily marked as green. If the interval distance C is greater than Y1 and less than Y2, the environmental risk level of the assessment block is medium, and the corresponding assessment block in the environmental leakage model is temporarily marked in yellow. If the interval distance C is less than Y1, the environmental risk level of the assessment block is classified as hazardous, and the corresponding assessment block in the environmental leakage model is temporarily marked in red.

4. The risk assessment method for sudden watershed water environment issues in hazardous chemical production enterprises according to claim 1, characterized in that: In S4.2.1, if A is located upstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in water and the water flow velocity V2, if the diffusion velocity V1 is greater than the water flow velocity V2, within one minute, the hazardous chemical travel distance C1 = 60*(V1-V2) is used. If C1 is greater than or equal to C, the evaluation block is marked in red. If C1 is less than C, the hazardous chemical travel distance C2 = C1-C is calculated. C2 is compared with the threshold Y3. If C2 is greater than or equal to the threshold Y3, the evaluation block is marked in yellow. If C2 is less than the threshold Y3, the evaluation block is marked in green. If the diffusion velocity V1 is less than or equal to the water flow velocity V2, the evaluation block is marked in green. If A is located downstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in the water and the flow velocity V2 of the water, within one minute, the hazardous chemical travel distance C3 = 60*(V1+V2) is used. If C3 is greater than or equal to C, the evaluation block is marked in red; if C1 is less than C, the evaluation block is marked in yellow.

5. The risk assessment method for sudden watershed water environment issues in hazardous chemical production enterprises according to claim 1, characterized in that: In S4.2.2, if B is a company with significant environmental risk, the assessment block is marked with yellow and a yellow dot; if B is a company with moderate environmental risk, the assessment block is marked with green and a yellow dot.

6. The risk assessment method for sudden watershed water environment issues in hazardous chemical production enterprises according to claim 1, characterized in that: In S4.2.3, if A is located upstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in water and the water flow velocity V2, if the diffusion velocity V1 is greater than the water flow velocity V2, within one minute, the hazardous chemical travel distance C1 = 60 * (V1 - V2) is used. If C1 is greater than or equal to C, the evaluation block is marked in red. If C1 is less than C, the hazardous chemical travel distance C2 = C1 - C is calculated. C2 is compared with the threshold Y3. If C2 is greater than or equal to the threshold Y3, the evaluation block is marked in yellow with a red dot. If C2 is less than the threshold Y3, the evaluation block is marked in yellow. If the diffusion velocity V1 is less than or equal to the water flow velocity V2, the evaluation block is marked in yellow. If A is located downstream of Ln, based on the diffusion velocity V1 of the hazardous chemical in the water and the flow velocity V2 of the water, within one minute, the hazardous chemical movement distance C3 = 60*(V1+V2) is used. If C3 is greater than or equal to C, the evaluation block is marked in red. If C1 is less than C, the evaluation block is marked in yellow with a red dot.

7. The risk assessment method for sudden watershed water environment issues in hazardous chemical production enterprises according to claim 1, characterized in that: In S4.2.4, if B is a company with a significant environmental risk, the assessment block is marked with a red dot and a yellow dot; if B is a company with a moderate environmental risk, the assessment block is marked with a yellow dot and a yellow dot.

8. The risk assessment method for sudden watershed water environment issues in hazardous chemical production enterprises according to claim 1, characterized in that: In S4.3, based on the number of red marked blocks D1 and the number of yellow marked blocks D2, the total number of abnormal marked blocks dn = D1 + D2 is calculated. The average value of the sum of the red marked blocks Mn is taken as D1′, and the average value of the sum of the yellow marked blocks Mn is taken as D2′. The average value d corresponding to each Mn is then calculated. 平 = (d1+d2+...dn) / n, if D1′ is greater than or equal to D2′, d 平 If Y4 is greater than or equal to Y4, the hazard warning module issues a level one warning. 平 If the value is less than Y4, the hazard warning module issues a level two warning. If D1′ is less than D2′, d 平 If Y4 is greater than or equal to Y4, the hazard warning module issues a level two warning. 平 If the value is less than Y4, the hazard warning module will issue a level three warning.

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