Pollution traceability analysis method based on topological relation of drainage pipe network

Abstract

The invention discloses a pollution traceability analysis method based on a topological relation of a drainage pipe network, and the method comprises the steps: collecting drainage pipe data information in a project region, and generating a drainage pipe database; the pipeline database is imported into a general survey platform, a pipe network topological graph is generated, and inspection and correction of the pipe network topological relation are completed; according to a pipe network topological graph, catchment area division is carried out on a project area, monitoring and point distribution are carried out based on the thought of whole-process treatment and prevention and control of discharge ports, pipe network important nodes and drainage households, and on-line monitoring, early warning and pollution tracing are carried out on a drainage pipe network. According to the method disclosed by the invention, by establishing the topological graph of the drainage pipe network, carrying out monitoring and point distribution, and carrying out online monitoring, early warning and pollution tracing on the drainage pipe network, the phenomena of mixed connection of rain and sewage, incomplete diversion of rain and sewage, stealing and leakage of residential areas and enterprises and the like of the drainage pipe network can be found in time, 24-hour real-time monitoring and early warning are realized, and a monitoring and supervision linkage quick response mechanism is established; and normalized monitoring of sewage entering the river is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of pollution source tracing analysis using pipe network topology, and in particular to a pollution source tracing analysis method based on drainage pipe network topology relationship. Background Art

[0002] At present, there are industrial parks on both sides of many urban water bodies and rivers, and sewage discharge into rivers is common, which leads to the decline of river water quality, water quality showing Class V or Class V, and failure to achieve water quality management targets. One of the main causes of pollution is the chaotic topology of the existing drainage network, which leads to (1) serious mixed connection of rainwater and sewage in the drainage network, chaotic network division, and incomplete rainwater and sewage separation, which directly affects the operation efficiency and environmental benefits of the overall drainage system. (2) The chaotic drainage network topology makes it more difficult to supervise drainage households, and communities and enterprises have committed illegal drainage. The randomness of illegal drainage behavior increases the difficulty of government supervision; at the same time, it is impossible to obtain evidence of accidents and identify the source of pollution, resulting in the inability to investigate the responsible party for the accident and difficulty in emergency response. (3) The chaotic topology of the drainage network is not conducive to real-time monitoring and early warning. Relying on manual inspections is inefficient. The discharge of sewage into the river is random and intermittent, and it is impossible to achieve 24-hour timely monitoring and early warning.

[0003] The patent document with application number 202210553247.0 discloses a supervision and traceability management platform for sewage outlets into rivers and seas. The application compares identical data with different data separately, gradually narrows the scope of investigation to achieve traceability of river sewage outlets, reduces the traceability time, improves the accuracy and efficiency of traceability of river sewage outlets, and also improves the safety management and emission supervision of enterprises. However, it also has the following problems: 1. It is difficult to grasp the topological relationship of the drainage network and it is not easy to accurately trace the source; 2. Water quality monitoring and hydraulic monitoring are not fully utilized during traceability, and the traceability point is not easy to accurately determine.

[0004] Based on the above reasons, there is an urgent need to establish a monitoring system based on the topological relationship of the drainage network, covering the key elements of the drainage system, taking into account both economic and technical aspects, assisting in pollution source analysis, and achieving rapid response in the linkage of sewage monitoring and supervision. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a pollution source tracing analysis method based on the topological relationship of the drainage network. By establishing a drainage network topology map and deploying monitoring points, online monitoring, early warning and pollution tracing of the drainage network can be achieved.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A pollution source tracing analysis method based on the topological relationship of a drainage network, comprising:

[0007] S1. Collect the drainage pipeline data in the project area, standardize it, and generate a drainage pipeline database;

[0008] S2. Import the pipeline database into the survey platform, clean the problem points according to the pipeline network topology, complete the inspection and correction of the pipeline network topology, and generate the pipeline network topology map;

[0009] S3. Divide the project area into catchment areas according to the pipe network topology map, and arrange monitoring points based on the whole process management and prevention and control ideas of the outlets, important nodes of the pipe network, and drainage households;

[0010] S4. Relying on monitoring points, online monitoring, early warning and pollution tracing of the drainage network are carried out.

[0011] As a further solution of the present invention: the generation of the drainage pipeline database in S1 comprises the following steps:

[0012] S11. Obtain the drainage pipeline data in GIS format, convert it into shapefile format, and perform point and line layer processing according to inspection wells, discharge outlets, pump stations, and drainage pipes;

[0013] S12, obtaining drainage pipeline CAD format data, performing point and line layer processing according to inspection wells, discharge outlets, pump stations, and drainage pipes, and extracting annotation information layer by layer based on spatial association relationships;

[0014] S13. Obtain the drainage pipeline data in Excel format, organize the data according to the table structure requirements of the drainage network database, and handle obvious errors such as empty rows and columns.

[0015] As a further solution of the present invention: the step of obtaining the drainage network topology map in S2 includes the following steps:

[0016] S21. Import the pipeline database into the survey platform, check the integrity, correctness and topological relationship according to the topological relationship of the pipeline network, and clean up the topological problem points;

[0017] S22, obtaining the processed drainage pipeline map format data;

[0018] S23, extracting drainage pipeline attribute data and associating it with map format data based on database information;

[0019] S23. Based on the associated information, use the GIS editing function to draw facility elements on the map and obtain the drainage network topology map.

[0020] As a further solution of the present invention: the topological problem points include: pipeline reverse slope, isolated node, node overlap, pipeline overlap, ring network, no downstream pipe, wrong pipeline connection and large pipe inside small pipe.

[0021] As a further solution of the present invention: the drainage pipeline map format data processing in S22 includes:

[0022] S22a, splicing the map according to the drainage pipeline area;

[0023] S22b, coordinate correction is performed based on existing topographic points on the map.

[0024] As a further solution of the present invention: the monitoring points include the outlet, the front end of the sewage interception pump, the important nodes of the pipe network, and the drainage households.

[0025] As a further solution of the present invention: the online monitoring in S4 includes:

[0026] Carry out water quality and hydraulic monitoring at the outlet points, and hydraulic monitoring at the front end of the sewage interception pump, important nodes of the pipe network, and drainage households;

[0027] Water quality monitoring includes water temperature, pH, turbidity, COD, ammonia nitrogen, total phosphorus and total nitrogen monitoring; hydraulic monitoring includes flow, flow velocity, liquid level and rainfall monitoring.

[0028] As a further solution of the present invention: the online early warning adopts early warning prompts, alarm prompts, event occurrence, event cancellation, alarm cancellation and early warning cancellation, and hierarchical early warning is used to monitor the whole process.

[0029] As a further solution of the present invention: the pollution source tracing includes tracing back the important nodes of the network and the water flow fluctuations of the drainage households from the discharge outlet according to the drainage network topology diagram, and analyzing the pollution source.

[0030] Beneficial effects of the present invention:

[0031] 1. The method of the present invention establishes a drainage network topology map, carries out monitoring point layout, and conducts online monitoring, early warning, and pollution tracing of the drainage network. It can promptly discover the mixed connection of rainwater and sewage in the drainage network, incomplete separation of rainwater and sewage, and leakage in communities and enterprises. It can achieve 24-hour timely monitoring and early warning, establish a rapid response mechanism for the linkage of monitoring and supervision, and realize normalized monitoring of sewage entering the river.

[0032] 2. The present invention scientifically divides the core area according to the drainage network structure and hydraulic topology, block area, population density, network length and other factors. On the basis of ensuring the monitoring effect, it takes into account the economic rationality of the monitoring plan, reasonably arranges the monitoring points, adopts a rotating monitoring mode, and reduces the one-time investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a flow chart of a pollution source tracing analysis method based on a drainage network topology relationship according to the present invention;

[0034] Figure 2 It is a standardized schematic diagram of drainage network data in the area of ​​the present invention;

[0035] Figure 3 A schematic diagram of the process of generating a drainage network topology diagram for the present invention;

[0036] Figure 4 It is a schematic diagram of the topological problem points of the present invention;

[0037] Figure 5 A topological diagram of a drainage network in a certain area of ​​the present invention;

[0038] Figure 6 This is a schematic diagram of the division of sub-catchment areas in a certain area of ​​the present invention;

[0039] Figure 7 This is a schematic diagram of the monitoring point distribution structure of the present invention;

[0040] Figure 8 This is a schematic diagram of online graded warning of the present invention;

[0041] Fig. 9 This is a schematic diagram of pollution source tracing of the present invention;

[0042] Fig.10 It is a schematic diagram of the hydraulic monitoring changes of pollution source tracing of the present invention. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] like Figure 1 As shown, the present invention discloses a pollution source tracing analysis method based on the topological relationship of the drainage network, comprising:

[0045] S1. Collect the drainage pipeline data in the project area, and generate a drainage pipeline database after standardized processing.

[0046] Drainage pipeline data mainly includes GIS format data, CAD format data, Excel format data, etc. Standardized processing flow such as Figure 2 As shown,

[0047] The drainage pipeline data in GIS format is obtained, converted into shapeFile format, and then layered processing is performed on the points and lines according to the inspection wells, discharge outlets, pumping stations, and drainage pipes; the drainage pipeline data in CAD format is obtained, and the points and lines are layered according to the inspection wells, discharge outlets, pumping stations, and drainage pipes, and the annotation information is extracted layer by layer based on the spatial association relationship; the drainage pipeline data in Excel format is obtained, and the data is sorted according to the table structure requirements of the drainage network database, and the obvious errors of empty rows and empty columns are processed; then a mapping relationship between each data item and the corresponding column of the database data table is established, and the obtained database data is imported into the drainage network database.

[0048] The drainage pipeline data is processed through the above standardization to generate a drainage pipeline database for easy subsequent use.

[0049] S2. Import the pipeline database into the survey platform, clean the problem points according to the pipeline network topology, complete the inspection and correction of the pipeline network topology, and generate the pipeline network topology map;

[0050] like Figure 3 As shown, the pipeline database is imported into the survey platform, and the integrity, correctness and topological relationship are checked according to the topological relationship of the pipeline network, and the topological problem points are cleaned; the drainage pipeline map format data of the designated area is obtained, the map is spliced ​​according to the drainage pipeline area, and the coordinates are corrected according to the existing terrain points on the map to match the map with the drainage pipeline data, and the processed drainage pipeline map format data is obtained; then, based on the database information, the drainage pipeline attribute data is extracted and associated with the map format data.

[0051] The topological problem points mainly include: pipeline reverse slope, isolated nodes, node overlap, pipeline overlap, ring network, no downstream pipe, wrong pipeline connection and large pipe covering small pipe, etc.

[0052] Pipeline reverse slope mainly refers to the situation where the bottom elevation of the pipe at the starting point is lower than the bottom elevation of the pipe at the end point. This is caused by incorrect pipeline flow direction or surveying errors, and generally requires on-site verification for correction.

[0053] Isolated nodes mainly refer to nodes that are not on the pipeline. The reason is that the node attributes are filled in incorrectly or there is no connecting pipe, etc. Generally, it is necessary to add a connecting pipe to correct it.

[0054] Node overlap refers to the repeated entry of two (or more) nodes with the same node coordinates. Generally, it is necessary to delete the duplicate nodes for correction.

[0055] Pipeline overlap refers to the connection of multiple pipelines between two adjacent inspection wells. This is mainly due to duplicate pipeline entry. It is generally necessary to delete the duplicate pipelines for correction.

[0056] A ring network refers to multiple pipelines connected to each other to form a ring pipeline, which leads to incorrect flow direction and generally requires on-site verification to correct it.

[0057] No downstream pipe means that the pipeline has no downstream and the end point is not an outlet. It is usually located in the residential area where the pipeline flows through. The downstream of the sewage treatment plant has not been detected and it is not a census area. Generally, additional connecting pipes are required for correction.

[0058] Pipeline misconnection refers to the existence of multiple downstream pipes in a single pipeline, which results in incorrect pipeline flow direction and generally requires on-site verification for correction.

[0059] A large pipe inside a small pipe means that the upstream pipe diameter is larger than the downstream pipe diameter, resulting in errors in pipeline flow direction and pipe diameter measurement, which generally require on-site verification for correction.

[0060] like Figure 4 As shown, the integrity, correctness and topological relationship of the demonstration area pipeline network were checked and analyzed, and problem points such as isolated points, node overlaps, and pipeline discontinuities were found and cleaned.

[0061] After cleaning the topological problem points, the associated information is used to draw the facility elements on the map using the GIS editing function to obtain the drainage network topology map, such as Figure 5 As shown in the figure, the topology map of the pipe network in a certain area is obtained. The topology map shows that there are 355 main drainage pipes and 365 nodes in the inspection area. The pipelines are relatively complete and the flow direction is relatively clear, which meets the construction requirements of the pipe network topology monitoring and tracing system.

[0062] S3. Divide the project area into catchment areas based on the network topology map, and arrange monitoring points based on the whole-process management and prevention of outlets, important nodes of the network, and drainage households.

[0063] like Figure 6 As shown in the figure (divided into 8 sub-catchment areas). Based on the whole process management and prevention and control ideas of the outlet (end), important nodes of the pipe network (process), and drainage households (source), monitoring points are arranged, such as Figure 6 , Figure 7 shown.

[0064] S4. Relying on monitoring points, conduct online monitoring, early warning and pollution tracing of the pipeline network.

[0065] Based on the monitoring points, online monitoring is carried out, including: setting up water quality monitoring and hydraulic monitoring at the outlet points, and adopting hydraulic monitoring for important nodes of the pipe network and drainage households. Water quality monitoring includes water temperature, PH, turbidity, COD, ammonia nitrogen, total phosphorus and total nitrogen, etc., and hydraulic monitoring includes flow, flow rate, liquid level, etc.

[0066] Through the water quality monitoring and hydraulic monitoring of the outlet, the real-time dynamics of sewage and the real-time water quality of the outlet can be monitored. At the same time, hydraulic monitoring can be used at the front end of the sewage interception pump station to monitor the illegal discharge and leakage in dry days in real time to prevent problematic water quality from entering the river.

[0067] When water quality problems are found, such as Figure 8 As shown, a six-level online warning method, including early warning prompt, alarm prompt, event occurrence, event cancellation, alarm cancellation and early warning cancellation, can be used to monitor the whole process in a hierarchical manner.

[0068] When water quality problems occur, such as Fig. 9 , 10 As shown, based on the drainage network topology diagram, we can trace back from the outlet point to the main nodes of the network, the flow, flow velocity and liquid level fluctuations of the drainage households, gradually narrow the scope and analyze the source of pollution.

[0069] The present invention relies on the topology of the pipe network to conduct pollution source analysis, taking into account important nodes and drainage households of the pipe network, and covering key hydraulic elements. When deploying the points, the flow rate of all the outlets of sewage into the river in the dry season can be monitored online, the monitoring data can be accumulated, and the total amount of pollutants discharged directly into the river can be counted; at the same time, the catchment area can be divided according to the topological relationship of the pipe network, and monitoring points of important nodes and important drainage households of the pipe network can be established, and a real-time online monitoring and early warning system can be constructed to trace the source of pollution.

[0070] At the same time, the core area is scientifically divided according to factors such as the pipeline structure and hydraulic topology, block area, population density, and pipeline length. On the basis of ensuring the monitoring effect, the economic rationality of the monitoring plan is taken into account, the monitoring points are reasonably arranged, and a rotation monitoring mode is adopted to reduce one-time investment, taking into account both economy and technology, and it is highly practical.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pollution source tracing analysis method based on drainage network topology, characterized in that: include: S1. Collect the drainage pipeline data in the project area, standardize it, and generate a drainage pipeline database; S2. Import the pipeline database into the survey platform, clean the problem points according to the pipeline network topology, complete the inspection and correction of the pipeline network topology, and generate the pipeline network topology map; S3. Divide the project area into catchment areas according to the pipe network topology map, and arrange monitoring points based on the whole process management and prevention and control ideas of the outlets, important nodes of the pipe network, and drainage households; S4. Relying on monitoring points, conduct online monitoring, early warning and pollution tracing of the drainage network.

2. According to claim 1, a pollution source tracing analysis method based on drainage network topology relationship is characterized in that: The step of generating a drainage pipeline database in S1 includes the following steps: S11. Obtain the drainage pipeline data in GIS format, convert it into shapefile format, and perform point and line layer processing according to inspection wells, discharge outlets, pump stations, and drainage pipes; S12, obtaining drainage pipeline CAD format data, performing point and line layer processing according to inspection wells, discharge outlets, pump stations, and drainage pipes, and extracting annotation information layer by layer based on spatial association relationships; S13. Obtain the drainage pipeline data in Excel format, organize the data according to the table structure requirements of the drainage network database, and handle obvious errors such as empty rows and columns.

3. The pollution source tracing analysis method based on drainage network topology according to claim 1 is characterized in that: The step of obtaining the drainage network topology diagram in S2 includes the following steps: S21. Import the pipeline database into the survey platform, check the integrity, correctness and topological relationship according to the topological relationship of the pipeline network, and clean up the topological problem points; S22, obtaining the processed drainage pipeline map format data; S23, extracting drainage pipeline attribute data and associating it with map format data based on database information; S23. Based on the associated information, use the GIS editing function to draw facility elements on the map and obtain the drainage network topology map.

4. The pollution source tracing analysis method based on drainage network topology according to claim 3 is characterized in that: The topological problem points include: pipeline reverse slope, isolated nodes, node overlap, pipeline overlap, ring network, no downstream pipe, wrong pipeline connection and large pipe inside small pipe.

5. The pollution source tracing analysis method based on drainage network topology according to claim 3 is characterized in that: The drainage pipeline map format data processing in S22 includes: S22a, splicing the map according to the drainage pipeline area; S22b, coordinate correction is performed based on existing topographic points on the map.

6. The pollution source tracing analysis method based on drainage network topology according to claim 1 is characterized in that: The monitoring points in S3 include the outlet, the front end of the sewage interception pump, important nodes of the pipe network, and drainage households.

7. The pollution source tracing analysis method based on drainage network topology according to claim 1 is characterized in that: The online monitoring in S4 includes: Carry out water quality and hydraulic monitoring at the outlet points, and hydraulic monitoring at the front end of the sewage interception pump, important nodes of the pipe network, and drainage households; Water quality monitoring includes water temperature, pH, turbidity, COD, ammonia nitrogen, total phosphorus and total nitrogen monitoring; hydraulic monitoring includes flow, flow velocity, liquid level and rainfall monitoring.

8. The pollution source tracing analysis method based on drainage network topology according to claim 1 is characterized in that: The online early warning in S4 adopts early warning prompt, alarm prompt, event occurrence, event cancellation, alarm cancellation and early warning cancellation, and hierarchical early warning monitors the whole process.

9. The pollution source tracing analysis method based on drainage network topology according to claim 1 is characterized in that: The pollution source tracing in S4 includes tracing back the important nodes of the network and the water flow fluctuations of the drainage households from the discharge outlet according to the drainage network topology diagram, and analyzing the pollution source.

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