Method and system for tracing source of urban underground water pollution source in karst area

Abstract

The invention relates to the technical field of electric digital data processing, in particular to a karst area urban groundwater pollution source tracing method and system, and the method comprises the steps: determining a pollution discharge large ditch and a large ditch inspection well in a pollution tracing supply area, and a main node on a sewage pipeline; determining a tracer concentration change curve on a main node corresponding to the large ditch inspection well and a tracer convergence degree change curve on the main node; the trend similarity of the two curves is determined, and then the concentration abnormal degree of the tracer agent on the main node is determined; the corrected tracer agent concentration is obtained through the tracer agent concentration abnormal degree and the original tracer agent concentration of the large groove inspection well; determining the dew point tracer agent concentration of the groundwater dew point by using the corrected tracer agent concentration; and determining the leakage possibility of the sewage pipeline corresponding to the large-groove inspection well by utilizing the concentration of the dew point tracer agent. Through the method provided by the invention, the leakage condition of each inspection well and the corresponding sewage pipeline can be more accurately detected, so that the tracing accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic digital data processing, and in particular to a method and system for tracing urban groundwater pollution sources in a karst area. Background Art

[0002] The karst area is a special geological area formed by the dissolution of soluble rocks such as limestone and dolomite. The groundwater system in the karst area is very fragile due to its high permeability. Due to the uneven medium of the karst aquifer, its anti-pollution performance is poor. The hydraulic connection between surface water and groundwater is close, and pollutants can easily enter the groundwater directly from the surface through sinkholes, karst fissures, etc. Once polluted, the pollutants will spread rapidly. Tracing the source of pollution can accurately locate the source of pollution and take timely measures to prevent the further spread of pollution, thereby protecting the groundwater environment.

[0003] The tracer method is a traditional method for tracing the source of groundwater pollution. When the groundwater outcrop point is polluted, but it is unclear where the pollution source is, the tracer is released from the sewage pipeline upstream of the outcrop point. The tracer equipment is installed at the polluted groundwater outcrop point to receive the signal. The source of pollution is determined by receiving the signal. However, in karst areas, due to the complexity of groundwater channels, the flow path of the tracer is difficult to accurately predict. And when there are many sewage pipelines upstream of the polluted groundwater outcrop point, the time required for the tracer to reach the detection point from the injection point will increase as the distance increases. During the long-distance migration process, the tracer will be affected by more factors, such as diffusion and dilution. When the tracer concentration is too low, it may be lower than the detection threshold and cannot be accurately detected, which will affect the tracking of its path and reduce the accuracy of tracing. Summary of the invention

[0004] In order to solve the technical problem of low accuracy in tracing the source of groundwater pollution in karst areas, the purpose of the present invention is to provide a method and system for tracing the source of urban groundwater pollution in karst areas. The technical scheme adopted is as follows: The present invention provides a method for tracing the source of urban groundwater pollution in a karst area, the method comprising: Determine the sewage ditch and ditch inspection well in the pollution source recharge area and the main node on the sewage pipeline relative to the sewage ditch; Determine the tracer concentration variation curve on the main node corresponding to the Dagou inspection well, and determine the tracer convergence degree variation curve on the main node; Determine the trend similarity between the tracer concentration change curve and the tracer convergence degree change curve, and use the trend similarity to determine the abnormal degree of the tracer concentration on the master node; The corrected tracer concentration is obtained by using the abnormality of the tracer concentration and the original tracer concentration of the Dagou inspection well. Using the corrected tracer concentration, determine the outcrop tracer concentration at the groundwater outcrop point; The tracer concentration at the dew point is used to determine the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well; Among them, the tracer is placed in the inspection well of the sewage pipeline, and the master node represents the master node inspection well.

[0005] Further, the step of determining the main node on the sewage pipeline relative to the sewage drainage ditch includes: Determine the inspection well on the sewage pipeline that is farthest from the sewage ditch; The inspection well on the shortest path between the sewage ditch and the farthest pipeline inspection well is determined as the main node.

[0006] Further, the step of determining the tracer concentration variation curve on the main node corresponding to the Dagou inspection well includes: Obtain the tracer concentration value on the main node corresponding to the Dagou inspection well according to the preset order; Using each tracer concentration value, a tracer concentration variation curve is generated.

[0007] Furthermore, the step of determining the tracer aggregation degree variation curve on the master node includes: Determine the master node information of the master node, and use the master node information to determine the tracer convergence degree value of each master node; The tracer convergence degree variation curve is determined using the convergence degree values ​​of each tracer.

[0008] Furthermore, the master node information includes: the number of upper-level nodes of the master node, and the physical distance between the upper-level node and the master node; the step of determining the tracer convergence degree value of each master node using the master node information includes: The tracer convergence degree value of each master node is calculated using the number of upper-level nodes and the physical distance.

[0009] Further, the steps of determining the trend similarity between the tracer concentration variation curve and the tracer convergence degree variation curve, and determining the abnormal degree of the tracer concentration on the master node by using the trend similarity include: Determine the difference in tracer concentration values ​​between adjacent master nodes on the tracer concentration variation curve; Determine the difference in tracer convergence degree values ​​between adjacent master nodes on the tracer convergence degree variation curve; The tracer concentration abnormality degree on the master node is calculated by using the tracer concentration value difference and the tracer convergence degree value difference.

[0010] Further, the step of obtaining a corrected tracer concentration by using the abnormality of the tracer concentration and the original tracer concentration of the Dagou inspection well includes: Determine the number of abnormal master nodes and the master node abnormality coefficient value; The original tracer concentration of the Dagou inspection well was corrected by using the number of abnormal main nodes, the abnormal coefficient value of the main nodes and the abnormal degree of tracer concentration to obtain the corrected tracer concentration.

[0011] Further, the step of determining the outcrop point tracer concentration of the groundwater outcrop point by using the corrected tracer concentration comprises: Determine the first inspection well on the sewage pipeline that is closest to the large ditch inspection well and its first tracer concentration; Determine the first physical distance and the second physical distance between the large ditch inspection well and the first inspection well and the groundwater outcropping point respectively; The outcropping point tracer concentration of the groundwater outcropping point is calculated using the corrected tracer concentration, the first tracer concentration, the first physical distance, and the second physical distance.

[0012] Further, the step of determining the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well by using the dew point tracer concentration includes: The dew point tracer concentration and the preset detection threshold are used to determine the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well.

[0013] The present invention also provides a system for tracing the pollution source of urban groundwater in a karst area, the system being used to implement the method for tracing the pollution source of urban groundwater in a karst area as described in any one of the above items; the system comprising: The regional planning module is used to determine the sewage ditch and ditch inspection wells in the pollution source tracing and replenishment area, as well as the main nodes on the sewage pipeline relative to the sewage ditch; The tracer analysis module is used to determine the tracer concentration variation curve on the main node corresponding to the Dagou inspection well, and determine the tracer convergence degree variation curve on the main node; determine the trend similarity between the tracer concentration variation curve and the tracer convergence degree variation curve, and use the trend similarity to determine the abnormal degree of the tracer concentration on the main node; use the abnormal degree of the tracer concentration and the original tracer concentration of the Dagou inspection well to obtain the corrected tracer concentration; use the corrected tracer concentration to determine the outcrop point tracer concentration of the groundwater outcrop point; The pipeline leakage detection module uses the tracer concentration at the dew point to determine the possibility of leakage in the sewage pipeline corresponding to the large ditch inspection well.

[0014] The present invention has the following beneficial effects: The present invention can determine the tracer concentration value and the tracer convergence degree value of each main node by calculating the distribution of each main node on the sewage pipeline corresponding to the sewage ditch and each inspection well thereof. Then, the abnormality degree value of the tracer concentration value of each main node is determined by combining the obtained tracer concentration change curve and the fluctuation of the tracer convergence degree change curve. Then, according to the abnormality degree of the tracer concentration value of each main node corresponding to the sewage ditch inspection well, the original tracer concentration value of the sewage ditch inspection well is corrected. Then, based on the corrected tracer concentration value of the sewage ditch inspection well, the leakage possibility of the corresponding sewage pipeline is calculated. The actual leakage situation of the sewage ditch inspection well is determined according to the leakage possibility. Compared with the existing method, the leakage situation of each inspection well and the corresponding sewage pipeline can be detected more accurately, thereby improving the accuracy of tracing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A flowchart of the steps of a method for tracing the source of urban groundwater pollution in a karst area provided by one embodiment of the present invention; Figure 2 A detailed flow chart of step S2 in a method for tracing the source of urban groundwater pollution in a karst area provided by one embodiment of the present invention; Figure 3 A detailed flow chart of step S3 in a method for tracing the source of urban groundwater pollution in a karst area provided by an embodiment of the present invention; Figure 4 A detailed flow chart of step S5 in a method for tracing the source of urban groundwater pollution in a karst area provided by an embodiment of the present invention; Figure 5 A schematic diagram of the scope of the pollution source tracing and recharge area involved in a method for tracing the pollution source of urban groundwater in a karst area provided by one embodiment of the present invention; Figure 6 A schematic diagram of a main node tracer concentration variation curve involved in a method for tracing urban groundwater pollution sources in a karst area provided by an embodiment of the present invention; Figure 7 It is a schematic diagram of the structure of the hardware operating environment of the equipment for tracing the source of urban groundwater pollution in a karst area involved in the embodiment of the present invention; Figure 8It is a schematic diagram of the framework structure of the system for tracing the source of urban groundwater pollution in karst areas involved in the embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the method for tracing the source of urban groundwater pollution in karst areas proposed by the present invention, its specific implementation method, structure, characteristics and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0018] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0019] The specific scheme of the method for tracing the pollution source of urban groundwater in a karst area provided by the present invention is described in detail below in conjunction with the accompanying drawings.

[0020] Embodiment 1: For the method of tracing the source of urban groundwater pollution in karst areas provided by the present invention, please refer to Figure 1 , which shows a flowchart of the steps of a method for tracing the source of urban groundwater pollution in a karst area provided by an embodiment of the present invention.

[0021] The method comprises: Step S1, determining the sewage ditch and ditch inspection well in the pollution source tracing supply area and the main node on the sewage pipeline relative to the sewage ditch; In one embodiment, the step of determining the main node on the sewage pipeline relative to the sewage drainage ditch includes: Determine the inspection well on the sewage pipeline that is farthest from the sewage ditch; The inspection well on the shortest path between the sewage ditch and the farthest pipeline inspection well is determined as the main node.

[0022] Please refer to Figure 5 An example of a pollution source recharge area is given below: First, based on a full analysis of the existing data, a hydrogeological survey is conducted to delineate the boundaries of the recharge area of ​​the urban groundwater outcrop points in the karst area to be analyzed, and to determine the scope of the recharge area upstream of the contaminated groundwater outcrop points. The drawings of the sewage ditches and sewage pipelines within the recharge area are collected, and the inspection wells on the sewage ditches and sewage pipelines are checked one by one to determine the direction of the sewage in the sewage pipelines and the number of pipelines, so as to generate a pollution tracing recharge area scope map, such as Figure 5As shown, the one labeled J1 belongs to sewage pipeline No. 1 and the inspection well number; the one labeled J2 belongs to sewage pipeline No. 2 and the inspection well number; the one labeled J3 belongs to sewage pipeline No. 3 and the inspection well number; the one labeled J4 belongs to sewage pipeline No. 4 and the inspection well number; the one labeled J5 belongs to sewage pipeline No. 5 and the inspection well number; and the one labeled P belongs to the sewage ditch and the inspection well number.

[0023] Then, tracers are placed simultaneously in multiple inspection wells (single-connected inspection wells) of the same sewage pipeline. Sensors (such as Figure 5 The main nodes in the No. 5 sewage pipeline are inspection wells No. 1, 4, 5, 7, and 9, which can also be called main node inspection wells). For example, if it is a tracer containing heavy metal ions, an ion selective electrode sensor is installed. If it is a fluorescent dye tracer, a fluorescent sensor is installed. The corresponding sensor can be selected according to the type of tracer.

[0024] Further explanation is needed here: For tracer placement, the first step is to check the well of the sewage ditch closest to the outcrop of contaminated groundwater. ( Figure 5 Consider P1 first, and then consider the sewage pipelines corresponding to other sewage ditch inspection wells in order to start placing tracers. Then, the tracer signal is received by the installed tracer equipment at the outcropping point of the contaminated groundwater. In the traditional method, if a tracer signal is received, it means that the sewage pipeline may leak. However, the tracer will be affected by more factors during the long-distance migration process, such as diffusion and dilution. In long-distance flow, the tracer will diffuse in different directions, making its concentration distribution more uneven. At the same time, the large flow of groundwater and mixing with other water bodies will cause the tracer to be diluted. When the tracer concentration is too low, it may be lower than the detection threshold, resulting in inaccurate detection. Therefore, the traditional method may miss the leakage of the sewage pipeline.

[0025] Therefore, if no tracer signal is detected at the outcropping point of contaminated groundwater through the installed tracer equipment, the well can be inspected through the sewage ditch. The concentration change of the tracer at the main node on the corresponding sewage pipeline is used to determine the possibility of leakage of the sewage pipeline, avoiding the occurrence of the above-mentioned traditional method.

[0026] Step S2, determining a tracer concentration variation curve on a main node corresponding to the Dagou inspection well, and determining a tracer convergence degree variation curve on the main node; Specifically, the step of determining the tracer concentration variation curve on the main node corresponding to the Dagou inspection well includes: Obtain the tracer concentration value on the main node corresponding to the Dagou inspection well according to the preset order; Using each tracer concentration value, a tracer concentration variation curve is generated.

[0027] Because the sewage ditch inspection well The groundwater on the corresponding sewage pipeline will eventually converge into the sewage ditch inspection well. Therefore, we first analyze the sewage ditch inspection well The tracer concentration change curve on the main node of the corresponding sewage pipeline is used to determine the inspection well passing through the sewage ditch. The effectiveness of the tracer concentration.

[0028] Specifically, the distance between the main node and the sewage ditch inspection well can be The tracer concentration values ​​on the master node are obtained from far to near, and then its variation curve is obtained, which is recorded as curve 1. The schematic diagram is shown in Figure 6 shown.

[0029] For details, please refer to Figure 2 , the steps of determining the tracer convergence degree change curve on the master node include: Step S21, determining the master node information of the master node, and determining the tracer aggregation degree value of each master node using the master node information; More specifically, the master node information includes: the number of upper-level nodes of the master node, and the physical distance between the upper-level nodes and the master node; the step of determining the tracer convergence degree value of each master node using the master node information includes: The tracer convergence degree value of each master node is calculated using the number of upper-level nodes and the physical distance.

[0030] Step S22, using each tracer convergence degree value to determine a tracer convergence degree variation curve.

[0031] Since the number of upper nodes connected to each master node is different, the more upper nodes a master node is connected to and the closer the physical distance is, the more tracers gathered on the corresponding master node, and the higher the tracer concentration on the corresponding master node should be. The number of upper nodes connected to each main node on the corresponding sewage pipeline (specially: if a main node has a branch, the corresponding upper node number is only increased by 1, and the number of nodes on the branch does not affect the number of upper nodes counted). Figure 5 Taking the No. 5 sewage pipeline as an example, with J5-1 as the main node, the corresponding upper-level nodes are J5-4, J5-2 and J5-3. The number of corresponding upper-level nodes is only increased by 1 because J5-2 and J5-3 are branches, so the total number of upper-level nodes of the main node is 2.

[0032] For sewage ditch inspection well The corresponding mth main node on the sewage pipeline. Its corresponding tracer convergence degree value is: In the formula, Indicates sewage ditch inspection well The tracer convergence degree value of the mth master node on the corresponding sewage pipeline. Indicates sewage ditch inspection well The number of parent nodes of the mth master node on the corresponding sewage pipeline. Indicates sewage ditch inspection well The physical distance between the rth parent node of the mth main node on the corresponding sewage pipeline and the mth main node (specially: if the rth parent node contains multiple nodes, the physical distance between the farthest node and the mth main node is represented).

[0033] According to the above calculation method, the sewage ditch inspection well can be calculated The tracer convergence degree value of each main node on the corresponding sewage pipeline. At the same time, the distance between the main node and the sewage ditch inspection well can be The tracer convergence degree values ​​of the master node are obtained from far to near, and its change curve is obtained, which is recorded as curve 2.

[0034] Step S3, determining the trend similarity between the tracer concentration change curve and the tracer convergence degree change curve, and determining the abnormal degree of the tracer concentration on the master node by using the trend similarity; For details, please refer to Figure 3 , the step S3 comprises: Step S31, determining the tracer concentration value difference between adjacent main nodes on the tracer concentration variation curve; Step S32, determining the difference in tracer convergence degree values ​​between adjacent master nodes on the tracer convergence degree variation curve; Step S33: using the tracer concentration value difference and the tracer convergence degree value difference, calculate the abnormality degree of the tracer concentration on the master node.

[0035] By analyzing the trend similarity of curve 1 and curve 2, the abnormality value of the tracer concentration value of each main node can be obtained. When the tracer convergence value of a main node is larger than that of the previous main node, it means that more tracers flow into the main node, and the tracer concentration value of the node should be larger to be more reasonable. When the next main node is the reference node, when the change trends (the slope direction of the line segment formed by the two points) of the two main nodes at the same position on the fluctuation curve 1 and the fluctuation curve 2 are different, it means that the tracer concentration value of the reference node is abnormal. When the change trend of the two main nodes at the same position on the fluctuation curve 2 is positive, and the change trend of the two main nodes at the same position on the fluctuation curve 1 is negative, it means that the reference node has a negative abnormality. When the change trend of the two main nodes at the same position on the fluctuation curve 2 is negative, and the change trend of the two main nodes at the same position on the fluctuation curve 1 is positive, it means that the reference node has a positive abnormality.

[0036] Therefore, the sewage ditch inspection well The mathematical formula for the abnormality of the tracer concentration value at the mth main node on the corresponding sewage pipeline is: In the formula, Indicates sewage ditch inspection well The abnormality degree value of the tracer concentration value of the mth main node on the corresponding sewage pipeline (tracer concentration abnormality degree). Represents the normalization function. Indicates sewage ditch inspection well The tracer concentration value of the mth main node on the corresponding sewage pipeline. Indicates sewage ditch inspection well The tracer concentration value of the m-1th main node on the corresponding sewage pipeline. Indicates sewage ditch inspection well The tracer convergence degree value of the mth master node on the corresponding sewage pipeline. Indicates sewage ditch inspection well The tracer convergence degree value of the m-1th main node on the corresponding sewage pipeline.

[0037] Step S4, using the abnormality of the tracer concentration and the original tracer concentration of the Dagou inspection well to obtain a corrected tracer concentration; Specifically, the step S4 includes: Determine the number of abnormal master nodes and the master node abnormality coefficient value; The original tracer concentration of the Dagou inspection well was corrected by using the number of abnormal main nodes, the abnormal coefficient value of the main nodes and the abnormal degree of tracer concentration to obtain the corrected tracer concentration.

[0038] Because the sewage ditch inspection well The tracer of each main node on the corresponding sewage pipeline will flow into the sewage ditch inspection well Therefore, according to the abnormal degree of the tracer concentration value of the abnormal master node To check the sewage ditch well The corresponding original tracer concentration value is corrected.

[0039] Specifically: when a negative anomaly occurs in the main node, it means that the tracer concentration value of the main node is too low, and the corresponding value needs to be corrected upward. On the contrary, when a positive anomaly occurs, it means that the tracer concentration value of the main node is too high, and the corresponding value needs to be corrected downward.

[0040] Therefore, the revised sewage ditch inspection well The mathematical formula for the corresponding tracer concentration value is: In the formula, Indicates sewage ditch inspection well Corrected tracer concentration value. Indicates sewage ditch inspection well The original tracer concentration value. Indicates the number of master nodes with abnormalities; Indicates sewage ditch inspection well The abnormal degree value of the tracer concentration value of the yth abnormal main node on the corresponding sewage pipeline. Indicates sewage ditch inspection well The abnormal coefficient value of the yth main node with abnormality on the corresponding sewage pipeline is 1 when it is a negative abnormality and -1 when it is a positive abnormality. Indicates the adjustment parameter value, which is an empirical value and can be set to 30 or other values ​​as needed.

[0041] Step S5, using the corrected tracer concentration to determine the outcrop point tracer concentration of the groundwater outcrop point; For details, please refer to Figure 4 , the step S5 comprises: Step S51, determining the first inspection well on the sewage pipeline that is closest to the large ditch inspection well and its first tracer concentration; Step S52, respectively determining a first physical distance and a second physical distance between the large ditch inspection well and the first inspection well and the groundwater outcropping point; Step S53, calculating the outcrop point tracer concentration of the groundwater outcrop point by using the corrected tracer concentration, the first tracer concentration, the first physical distance and the second physical distance.

[0042] Specific: First, check the sewage ditch well It is directly connected to the inspection well on the nearest sewage pipeline. It is also directly connected to the outcropping point of contaminated groundwater. Therefore, the well can be inspected through the sewage ditch. The concentration change of the tracer between the inspection well on the nearest sewage pipeline is used to determine the diffusion degree of the tracer flowing to the outcropping point of the contaminated groundwater. The corresponding mathematical formula is: In the formula, Indicates sewage ditch inspection well The diffusion rate per unit length of the tracer flowing to the outcrop point of contaminated groundwater. Indicates sewage ditch inspection well Corrected tracer concentration value. Indicates the distance from the sewage pipeline to the sewage ditch inspection well The tracer concentration value (first tracer concentration) on the nearest inspection well (recorded as inspection well 1, also known as the first inspection well). Indicates sewage ditch inspection well The physical distance from inspection well 1 (first physical distance). Indicates sewage ditch inspection well and the tracer concentration difference value of inspection well 1.

[0043] Then we can estimate the number of manholes through the sewage ditch inspection well The concentration value of the tracer flowing to the outcropping point of the contaminated groundwater. The corresponding mathematical formula is: In the formula, Indicates the estimated number of inspection wells through the sewage ditch The concentration value of the tracer that flows to the outcrop point of the contaminated groundwater (outcrop point tracer concentration). Indicates sewage ditch inspection well The diffusion rate per unit length of the tracer flowing to the outcrop point of contaminated groundwater. Indicates sewage ditch inspection well The physical distance from the outcrop point of contaminated groundwater (second physical distance).

[0044] Step S6, using the dew point tracer concentration, determining the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well; Specifically, the step S6 includes: The dew point tracer concentration and the preset detection threshold are used to determine the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well.

[0045] If the calculated If the value is less than the preset detection threshold (set according to actual needs), it means that the result that the contaminated groundwater outcrop point did not receive the tracer signal is correct. If the value is greater than or equal to the detection threshold, it means that the result that the contaminated groundwater outcrop did not receive the tracer signal may be inaccurate, and the tracer concentration may be abnormally diluted due to other reasons. The corresponding mathematical formula for the leakage possibility of the sewage pipeline is: In the formula, Indicates sewage ditch inspection well The possibility of leakage in the corresponding sewage pipeline. Indicates the estimated number of inspection wells through the sewage ditch The concentration value of the tracer that flows to the outcrop point of the contaminated groundwater (outcrop point tracer concentration). Indicates the preset detection threshold.

[0046] Among them The value is greater than 2 When it is on, it means the sewage ditch inspection well The corresponding sewage pipeline has a high possibility of leakage. The corresponding sewage pipeline is considered to be leaking.

[0047] According to the various steps of the above embodiment, the tracer can be used to detect the leakage of the sewage pipeline corresponding to each inspection well on the sewage drainage ditch, thereby obtaining all the leaking pipelines. Then, according to the determined leaking pipeline, the groundwater connection test is used to further carry out the precise investigation of the polluted leakage section or leakage point. According to the distance between the inspection well in the leaking pipeline and the contaminated groundwater outcropping point, the connection test is carried out in the inspection well in sequence according to the principle of from near to far, and the specific leakage section or leakage point in the sewage pipeline is accurately found. After locking the leakage section or leakage point, the leakage repair measures are immediately carried out on the leakage section or leakage point, and the leakage repair effect is verified by the connection test until all the leakage sections or leakage points that have been found are repaired intact. Repeat the above process until all the leakage sections and leakage points in the same sewage pipeline are repaired. Repeat the above process again to find and repair all the leakage sections and leakage points of the sewage pipeline within the recharge area.

[0048] According to the above steps, a method for tracing the sources of urban groundwater pollution in karst areas is established, which provides a set of rapid methods for tracing the sources of urban groundwater pollution and governance and remediation in karst areas, greatly reducing the time and cost of tracing the sources of urban groundwater pollution and governance and remediation in karst areas, and effectively alleviating the pressure on urban ecological environment protection and groundwater pollution prevention and control in karst areas.

[0049] The present invention can determine the tracer concentration value and the tracer convergence degree value of each main node by calculating the distribution of each main node on the sewage pipeline corresponding to the sewage ditch and each inspection well thereof. Then, the abnormality degree value of the tracer concentration value of each main node is determined by combining the obtained tracer concentration change curve and the fluctuation of the tracer convergence degree change curve. Then, according to the abnormality degree of the tracer concentration value of each main node corresponding to the sewage ditch inspection well, the original tracer concentration value of the sewage ditch inspection well is corrected. Then, based on the corrected tracer concentration value of the sewage ditch inspection well, the leakage possibility of the corresponding sewage pipeline is calculated. The actual leakage situation of the sewage ditch inspection well is determined according to the leakage possibility. Compared with the existing method, the leakage situation of each inspection well and the corresponding sewage pipeline can be detected more accurately, thereby improving the accuracy of tracing.

[0050] Embodiment 2: The embodiment of the present invention also provides a device for tracing the source of groundwater pollution in a karst area city. The device for tracing the source of groundwater pollution in a karst area city can be a data computing and processing device such as a computer, a server, or a combination of multiple devices.

[0051] like Figure 7 As shown, Figure 7 It is a structural diagram of the hardware operating environment of the equipment for tracing the source of urban groundwater pollution in karst areas involved in the embodiment of the present invention.

[0052] like Figure 7 As shown, the karst area urban groundwater pollution source tracing device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display (Display), an input unit such as a control panel, and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WIFI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001. The memory 1005 as a computer storage medium may include a karst area urban groundwater pollution source tracing program.

[0053] Those skilled in the art will understand that Figure 7 The hardware structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0054] Continue to refer to Figure 7 , Figure 7 The memory 1005 as a computer-readable storage medium may include an operating system, a user interface module, a network communication module, and a karst area urban groundwater pollution source tracing program.

[0055] exist Figure 7 In the embodiment, the network communication module is mainly used to connect to the server and can communicate data with the server; and the processor 1001 can call the karst area urban groundwater pollution source tracing program stored in the memory 1005, and execute the steps in the above embodiments.

[0056] The hardware structure of the above-mentioned karst area urban groundwater pollution source tracing device is used to implement various embodiments of the karst area urban groundwater pollution source tracing method of the present invention.

[0057] In addition, the present invention also provides a tracing system for urban groundwater pollution sources in karst areas. Figure 8 The karst area urban groundwater pollution source tracing system includes: Regional planning module A10 is used to determine the sewage ditch and ditch inspection well in the pollution source tracing and replenishment area and the main node on the sewage pipeline relative to the sewage ditch; The tracer analysis module A20 is used to determine the tracer concentration variation curve on the main node corresponding to the large ditch inspection well, and determine the tracer convergence degree variation curve on the main node; determine the trend similarity between the tracer concentration variation curve and the tracer convergence degree variation curve, and determine the abnormal degree of the tracer concentration on the main node by using the trend similarity; obtain the corrected tracer concentration by using the abnormal degree of the tracer concentration and the original tracer concentration of the large ditch inspection well; and determine the outcrop point tracer concentration of the groundwater outcrop point by using the corrected tracer concentration; The pipeline leakage detection module A30 uses the tracer concentration at the dew point to determine the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well.

[0058] Furthermore, the regional planning module A10 is also used for: Determine the inspection well on the sewage pipeline that is farthest from the sewage ditch; The inspection well on the shortest path between the sewage ditch and the farthest pipeline inspection well is determined as the main node.

[0059] Furthermore, the tracer analysis module A20 is also used for: Obtain the tracer concentration value on the main node corresponding to the Dagou inspection well according to the preset order; Using each tracer concentration value, a tracer concentration variation curve is generated.

[0060] Furthermore, the tracer analysis module A20 is also used for: Determine the master node information of the master node, and use the master node information to determine the tracer convergence degree value of each master node; The tracer convergence degree variation curve is determined using the convergence degree values ​​of each tracer.

[0061] Furthermore, the tracer analysis module A20 is also used for: The tracer convergence degree value of each master node is calculated using the number of upper-level nodes and the physical distance.

[0062] Furthermore, the tracer analysis module A20 is also used for: Determine the difference in tracer concentration values ​​between adjacent master nodes on the tracer concentration variation curve; Determine the difference in tracer convergence degree values ​​between adjacent master nodes on the tracer convergence degree variation curve; The tracer concentration abnormality degree on the master node is calculated by using the tracer concentration value difference and the tracer convergence degree value difference.

[0063] Furthermore, the tracer analysis module A20 is also used for: Determine the number of abnormal master nodes and the master node abnormality coefficient value; The original tracer concentration of the Dagou inspection well was corrected by using the number of abnormal main nodes, the abnormal coefficient value of the main nodes and the abnormal degree of tracer concentration to obtain the corrected tracer concentration.

[0064] Furthermore, the tracer analysis module A20 is also used for: Determine the first inspection well on the sewage pipeline that is closest to the large ditch inspection well and its first tracer concentration; Determine the first physical distance and the second physical distance between the large ditch inspection well and the first inspection well and the groundwater outcropping point respectively; The outcropping point tracer concentration of the groundwater outcropping point is calculated using the corrected tracer concentration, the first tracer concentration, the first physical distance, and the second physical distance.

[0065] Furthermore, the pipeline leak detection module A30 is also used for: The dew point tracer concentration and the preset detection threshold are used to determine the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well.

[0066] The specific implementation method of the karst area urban groundwater pollution source tracing system of the present invention is basically the same as the various embodiments of the karst area urban groundwater pollution source tracing method described above, and will not be repeated here.

[0067] In addition, the present invention also provides a computer-readable storage medium. The computer-readable storage medium of the present invention stores a tracing program for urban groundwater pollution sources in karst areas, wherein when the tracing program for urban groundwater pollution sources in karst areas is executed by a processor, the steps of the tracing method for urban groundwater pollution sources in karst areas as described above are implemented.

[0068] Among them, the method implemented when the karst area urban groundwater pollution source tracing program is executed can refer to the various embodiments of the karst area urban groundwater pollution source tracing method of the present invention, and will not be repeated here.

[0069] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0070] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0071] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the protection scope of the present invention. All equivalent structural / method transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the protection scope of the present invention.

Claims

1. A method for tracing the source of urban groundwater pollution in karst areas, characterized in that: The method comprises: Determine the sewage ditch and ditch inspection well in the pollution source recharge area and the main node on the sewage pipeline relative to the sewage ditch; Determine the tracer concentration variation curve on the main node corresponding to the Dagou inspection well, and determine the tracer convergence degree variation curve on the main node; Determine the trend similarity between the tracer concentration change curve and the tracer convergence degree change curve, and use the trend similarity to determine the abnormal degree of the tracer concentration on the master node; The corrected tracer concentration is obtained by using the abnormality of the tracer concentration and the original tracer concentration of the Dagou inspection well. Using the corrected tracer concentration, determine the outcrop tracer concentration at the groundwater outcrop point; The tracer concentration at the dew point is used to determine the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well; Among them, the tracer is placed in the inspection well of the sewage pipeline, and the master node represents the master node inspection well.

2. The method for tracing the source of urban groundwater pollution in karst areas according to claim 1 is characterized in that: The steps for determining the main node on the sewage pipeline relative to the sewage ditch include: Determine the inspection well on the sewage pipeline that is farthest from the sewage ditch; The inspection well on the shortest path between the sewage ditch and the farthest pipeline inspection well is determined as the main node.

3. The method for tracing the source of urban groundwater pollution in karst areas according to claim 1 is characterized in that: The steps of determining the tracer concentration variation curve at the main node corresponding to the Dagou inspection well include: Obtain the tracer concentration value on the main node corresponding to the Dagou inspection well according to the preset order; Using each tracer concentration value, a tracer concentration variation curve is generated.

4. The method for tracing the source of urban groundwater pollution in karst areas according to claim 1 is characterized in that: The steps of determining the tracer convergence degree variation curve on the master node include: Determine the master node information of the master node, and use the master node information to determine the tracer convergence degree value of each master node; The tracer convergence degree variation curve is determined using the convergence degree values ​​of each tracer.

5. The method for tracing the source of urban groundwater pollution in karst areas according to claim 4 is characterized in that: The master node information includes: the number of upper-level nodes of the master node and the physical distance between the upper-level node and the master node; the step of determining the tracer convergence degree value of each master node using the master node information includes: The tracer convergence degree value of each master node is calculated using the number of upper-level nodes and the physical distance.

6. The method for tracing the source of urban groundwater pollution in karst areas according to claim 1 is characterized in that: The steps of determining trend similarity between the tracer concentration variation curve and the tracer convergence degree variation curve, and determining the degree of abnormality of the tracer concentration on the master node by using the trend similarity, include: Determine the difference in tracer concentration values ​​between adjacent master nodes on the tracer concentration variation curve; Determine the difference in tracer convergence degree values ​​between adjacent master nodes on the tracer convergence degree variation curve; The tracer concentration abnormality degree on the master node is calculated by using the tracer concentration value difference and the tracer convergence degree value difference.

7. The method for tracing the source of urban groundwater pollution in karst areas according to claim 1 is characterized in that: The steps of obtaining the corrected tracer concentration using the abnormality of the tracer concentration and the original tracer concentration of the Dagou inspection well include: Determine the number of abnormal master nodes and the master node abnormality coefficient value; The original tracer concentration of the Dagou inspection well was corrected by using the number of abnormal main nodes, the abnormal coefficient value of the main nodes and the abnormal degree of tracer concentration to obtain the corrected tracer concentration.

8. The method for tracing the source of urban groundwater pollution in karst areas according to claim 1 is characterized in that: The steps of determining the outcrop point tracer concentration of the groundwater outcrop point using the corrected tracer concentration include: Determine the first inspection well on the sewage pipeline that is closest to the large ditch inspection well and its first tracer concentration; Determine the first physical distance and the second physical distance between the large ditch inspection well and the first inspection well and the groundwater outcropping point respectively; The outcropping point tracer concentration of the groundwater outcropping point is calculated using the corrected tracer concentration, the first tracer concentration, the first physical distance, and the second physical distance.

9. The method for tracing the source of urban groundwater pollution in karst areas according to claim 1 is characterized in that: The steps for determining the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well using the dew point tracer concentration include: The dew point tracer concentration and the preset detection threshold are used to determine the leakage possibility of the sewage pipeline corresponding to the large ditch inspection well.

10. A system for tracing the source of urban groundwater pollution in karst areas, characterized in that: The system is used to implement the method for tracing the source of urban groundwater pollution in a karst area as described in any one of claims 1 to 9; the system comprises: The regional planning module is used to determine the sewage ditch and ditch inspection wells in the pollution source tracing and replenishment area, as well as the main nodes on the sewage pipeline relative to the sewage ditch; The tracer analysis module is used to determine the tracer concentration variation curve on the main node corresponding to the Dagou inspection well, and determine the tracer convergence degree variation curve on the main node; determine the trend similarity between the tracer concentration variation curve and the tracer convergence degree variation curve, and use the trend similarity to determine the abnormal degree of the tracer concentration on the main node; use the abnormal degree of the tracer concentration and the original tracer concentration of the Dagou inspection well to obtain the corrected tracer concentration; use the corrected tracer concentration to determine the outcrop point tracer concentration of the groundwater outcrop point; The pipeline leakage detection module uses the tracer concentration at the dew point to determine the possibility of leakage in the sewage pipeline corresponding to the large ditch inspection well.

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