Coastal wetland shallow underground environment information real-time monitoring device and evaluation method

Abstract

The invention discloses a coastal wetland shallow underground environment information real-time monitoring device and an evaluation method, and belongs to the field of coastal wetland environment research. A monitoring sensor comprises an outer shell, a sealing cover A is arranged at the upper end of the outer shell, a sealing flange is arranged at the lower end of the outer shell, and a sensor mounting seat is arranged on the sealing flange; a plurality of water quality sensors for collecting water quality data are mounted on the sensor mounting seat, a battery and a control circuit board are arranged in the outer shell, and the battery and the plurality of water quality sensors are electrically connected with the control circuit board. The evaluation method comprises steps S1 to S12. According to the invention, the sensor is buried underground by using the monitoring vertical pipe structure, and by means of the floating ventilation structure, the influence of tidal water on a monitored target water source can be effectively isolated, and the monitoring result is more accurate; the water quality pollution degree in a research area is comprehensively evaluated through water quality data collected in real time, the pollution degree of a pollution source is analyzed, it is ensured that the pollution source can be treated in time, and scientific data support and means are provided for disaster prevention and reduction of coastal wetlands.

Description

Technical Field

[0001] The present invention relates to the field of coastal wetland environmental research, and in particular to a real-time monitoring device and an evaluation method for shallow underground environmental information of coastal wetlands. Background Art

[0002] Coastal wetlands are coastal areas between land and shallow sea with a water depth of no more than 6m at low tide. They mainly include distributary channels, breach scallops, natural levees, floodplains and sedimentary depressions, and are "marginal areas" with the characteristics of land-sea transition phase. The hydrological ecosystem of coastal wetlands is extremely fragile. The physical and chemical properties of shallow groundwater play a vital role in its growth and development, and the main sources of shallow groundwater are atmospheric precipitation and surface water. The driving force of shallow groundwater changes is mainly the dynamic effect caused by tidal fluctuations, the hydrochemical movement driven by salinity, and the superposition of ocean tides. Its rapid changes, especially the high-frequency changes of shallow groundwater caused by sudden tidal fluctuations induced by cold waves, high temperatures and typhoons, will constitute an unpredictable risk of decline in coastal wetlands. Therefore, shallow groundwater in coastal wetlands is the first "barrier" to prevent the vertical intrusion of nearshore seawater into medium and deep confined water, and can effectively inhibit the reverse infiltration of seawater. At the same time, groundwater discharge in coastal wetlands plays an important role in the transportation of nutrients, pollutants and other chemicals, and has a significant impact on the ecological environment. However, while the ecological services and economic and social values ​​of coastal wetlands have attracted global attention, they are also facing the threat of high-intensity human activities, and groundwater pollution in coastal wetlands is becoming increasingly serious. In addition, with the world's population moving to coastal zones, coastal wetlands are likely to be severely damaged in the future. Therefore, monitoring shallow groundwater in coastal wetlands and clarifying its driving mechanism are of great significance to protecting coastal wetlands and preventing and reducing disasters.

[0003] At present, the existing methods for monitoring shallow groundwater in coastal wetlands are mainly:

[0004] 1. Collect surface water samples for analysis using the trawl-net hanging bottle method;

[0005] 2 After low tide, drill holes on the tidal flats to collect water samples for analysis.

[0006] Existing technologies make it difficult to achieve all-weather, autonomous, and remote monitoring of shallow groundwater in coastal wetlands. In particular, shallow groundwater changes rapidly with the rise and fall of the tide, and its high-frequency information on a second-by-second, minute-by-hour basis has not been captured so far. In addition, since tidal flats are muddy and difficult to walk on, monitoring is difficult and the manpower and material costs are high. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the present invention provides a coastal wetland shallow underground environment monitoring device and evaluation method, which can effectively improve monitoring efficiency, reduce costs, and achieve all-weather, autonomous remote monitoring and pollution source assessment.

[0008] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0009] Provided is a coastal wetland shallow underground environment monitoring device, comprising an outer shell, wherein a sealing cover A is arranged at the upper end of the outer shell, a sealing flange is arranged at the lower end, a sensor mounting seat is arranged on the sealing flange, a plurality of water quality sensors for collecting water quality data are mounted on the sensor mounting seat, the water quality sensors are arranged in a sensor protection cover, and the sensor protection cover is fixed on the sensor mounting seat, a battery and a control circuit board are arranged in the outer shell, and the battery and the plurality of water quality sensors are electrically connected to the control circuit board.

[0010] Furthermore, an upper fixing seat and a lower fixing seat are arranged in the outer shell, and a groove for clamping the battery is arranged on the upper fixing seat and the lower fixing seat.

[0011] Furthermore, the groove is a square structure, and arc chamfers are arranged at the corners of the groove.

[0012] Furthermore, the sealing flange is an annular structure, the sealing flange is detachably connected to the outer shell, a convex ridge is arranged on the inner wall of the sealing flange, and a groove engaging with the convex ridge is arranged on the edge of the control circuit board.

[0013] Furthermore, a sealing ring is provided on the surface of the sealing flange in contact with the sensor mounting seat, and the sealing ring is squeezed and fitted with the sensor mounting seat to seal.

[0014] Furthermore, the sensor mounting seat is provided with a plurality of mounting holes for mounting water quality sensors.

[0015] Furthermore, the sealing cover A is threadedly connected to the outer shell, and the sealing cover A is provided with a boss that matches the outer shell.

[0016] A method for monitoring and evaluating the shallow groundwater environment of a coastal wetland using the above-mentioned real-time monitoring device for shallow underground environmental information of a coastal wetland is provided, which comprises the following steps:

[0017] S1: Select several monitoring points evenly in the research area of ​​coastal wetlands, drill holes downwards at the monitoring points to install pipes with lower openings, install environmental monitoring devices on support frames, and use the support frames to place the environmental monitoring devices into the pipes to contact groundwater;

[0018] S2: A sealing cover A is provided at the upper end of the pipeline to prevent seawater from entering. The sealing cover A is sealed and connected to a vent pipe. The end of the vent pipe is connected to a floating ball, and the end of the vent pipe passes through the floating ball and is connected to the air. The vent pipe discharges the gas in the pipeline. The floating ball floats up and down with the height of the seawater level to ensure that the air outlet of the vent pipe is always above the water surface.

[0019] S3: The environmental monitoring device regularly collects water quality data of groundwater in coastal wetlands and constructs a water quality data set at each monitoring point n is the type of water quality data, t is the number of times water quality data is collected, is the nth type of water quality data collected at the tth time;

[0020] S4: constructing an ordered sequence of different water quality data according to the water quality data groups collected from two adjacent water quality data;

[0021]

[0022] Among them, k is the number of times water quality data is collected, r k is the number of abnormal fluctuations in water quality data, s t is the cumulative number of abnormal fluctuations in the nth type of water quality data collected at time t;

[0023] S5: Calculate the statistics U of abnormal fluctuations of each water quality data n ;

[0024]

[0025] Among them, E(s t ) is the mean of the cumulative quantity, V(s t ) is the variance of the cumulative quantity;

[0026] S6: According to the statistics U corresponding to each water quality data n , calculate the water quality stability coefficient f of the groundwater at the monitoring point a ;

[0027]

[0028] Among them, U i is the statistic of the i-th water quality data, i is the type number of the water quality data, α i is the weight coefficient of the i-th water quality data;

[0029] S7: Set water quality stability threshold f 阈值 , if f a >f 阈值 , then it is determined that the water quality stability of the current monitoring point is poor, and step S8 is executed; if f a ≤f 阈值, it is judged that the water quality stability of the current monitoring point is good;

[0030] S8: Obtain all monitoring points with poor water quality stability in the study area of ​​the coastal wetland, construct a two-dimensional coordinate system in the map plane, and obtain the coordinates of each monitoring point. b ,y b ) to calculate the correlation value, b is the number of the monitoring point with poor water quality stability in the study area of ​​the coastal wetland;

[0031]

[0032] Among them, u b～b-1 is the correlation value between the bth monitoring point with poor water quality stability and the b-1th monitoring point with poor water quality stability,

[0033] S9: If u b～b-1 ≤2l, it is determined that the bth monitoring point with poor water quality stability and the b-1th monitoring point with poor water quality stability are polluted by the same pollution source, otherwise, they are not polluted by the same pollution source, l is the average distance between the monitoring points;

[0034] S10: After screening out all monitoring points polluted by the same pollution source, based on the altitudes of the monitoring points in the coastal wetland, the monitoring point with the highest altitude is taken as the monitoring point closest to the pollution source, and the pollution source is searched with the monitoring point closest to the pollution source as the center;

[0035] S11: Obtain water quality data collected at all monitoring points polluted by the same pollution source for the tth time, and calculate the pollution degree coefficient F of the pollution source;

[0036]

[0037] Among them, (x0, y0) is the coordinate of the center, (x′, y′) is the coordinate of the monitoring point farthest from the center among all the monitoring points polluted by the same pollution source, S is the total area of ​​the study area, e is the number of monitoring points polluted by the same pollution source, E is the total number of monitoring points polluted by the same pollution source, x i～e is the i-th water quality data of monitoring point e, x i ′ is the standard value of the i-th water quality data;

[0038] S12: Set the pollution coefficient threshold F 阈值 , if F ≥ F 阈值 , it is determined that the pollution source has a serious impact on the groundwater pollution in the study area, and it is necessary to eliminate the pollution source in time; otherwise, it is determined that the pollution source has a minor impact on the groundwater pollution in the study area.

[0039] The beneficial effects of the present invention are:

[0040] 1. The present invention uses a monitoring vertical pipe structure to bury the sensor underground, and with the help of a floating ventilation structure, it can effectively isolate the influence of tides on the monitored target water source, and the monitoring results are more accurate;

[0041] 2. The monitoring sensor can automatically collect suspended sediment concentration, chlorophyll, total carbon, total nitrogen, temperature, salinity and other elements of shallow groundwater at regular intervals, and send the data to the backend server through the wireless network communication module. Users can view the working status of the equipment at each monitoring point and various parameters of shallow groundwater in coastal wetlands in real time;

[0042] 3. Comprehensively evaluate the degree of water pollution in the study area through real-time collected water quality data, analyze the degree of pollution of pollution sources, ensure that pollution sources can be dealt with in a timely manner, and provide scientific data support and means for coastal wetland disaster prevention and mitigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Explosion of real-time monitoring device for shallow underground environmental information in coastal wetlands Figure 1 .

[0044] Figure 2 Explosion of real-time monitoring device for shallow underground environmental information in coastal wetlands Figure 2 .

[0045] Figure 3 This is a schematic diagram of the installation of a real-time monitoring device for shallow underground environmental information in coastal wetlands.

[0046] Among them, 1. Sealing cover A, 2. Upper fixing seat, 3. Battery, 4. Outer shell, 5. Lower fixing seat, 6. Sealing flange, 7. Sensor mounting seat, 8. Water quality sensor, 9. Sensor protection cover, 10. Boss, 11. Groove, 12. Sealing ring, 13. Control circuit board, 14. Ridge, 15. Support frame, 16. Pipe, 17. Lifting rope, 18. Sealing cover B, 19. Air pipe joint, 20. Ventilation pipe, 21. Float. DETAILED DESCRIPTION

[0047] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0048] like Figure 1 and Figure 2As shown, a real-time monitoring device for shallow underground environmental information of coastal wetlands includes an outer shell 4, a sealing cover A1 is provided at the upper end of the outer shell 4, a sealing flange 6 is provided at the lower end, a sensor mounting seat 7 is provided on the sealing flange 6, and a plurality of water quality sensors 8 for collecting water quality data are installed on the sensor mounting seat 7. In this embodiment, the water quality sensor 8 may include a chlorophyll sensor, a water quality sensor 8, a pH sensor, a turbidity sensor, etc. The water quality sensor 8 is arranged in a sensor protective cover 9, and the sensor protective cover 9 is used to protect the sensor. The water quality sensor 8 of this embodiment adopts a sensor probe with a cleaning function, and the sensor protective cover 9 is fixed on the sensor mounting seat 7. A battery 3 and a control circuit board 13 are arranged in the outer shell 4, and the battery 3 and the plurality of water quality sensors 8 are electrically connected to the control circuit board 13. In this embodiment, the control circuit board 13 adopts a PCB board equipped with an STM32L071 single-chip microcomputer.

[0049] In this embodiment, an upper fixing seat 2 and a lower fixing seat 5 are provided in the outer shell 4, and a groove 11 for clamping the battery 3 is provided on the upper fixing seat 2 and the lower fixing seat 5, which is used to fix the battery pack formed by multiple batteries 3 to prevent random shaking. The groove 11 is a square structure, and the corners of the groove 11 are provided with arc chamfers to ensure that it can fit the contour of the battery pack.

[0050] In this embodiment, the sealing flange 6 is an annular structure, and the sealing flange 6 and the outer shell 4 are detachably connected. A ridge 14 is provided on the inner wall of the sealing flange 6, and a groove 11 engaged with the ridge 14 is provided on the edge of the control circuit board 13 for fixing the control circuit board 13.

[0051] In this embodiment, a sealing ring 12 is provided on the surface where the sealing flange 6 contacts the sensor mounting seat 7 . The sealing ring 12 and the sensor mounting seat 7 are squeezed and sealed to ensure the sealing of the sensor as a whole and prevent water from entering the outer shell 4 .

[0052] In this embodiment, a plurality of mounting holes for mounting water quality sensors 8 are provided on the sensor mounting base 7 for mounting multiple water quality sensors 8 of different types. Different types of sensors can be replaced according to actual needs.

[0053] In this embodiment, the sealing cover A1 is threadedly connected to the outer shell 4, and a boss 10 is provided on the sealing cover A1 to cooperate with the outer shell 4, which ensures the sealing performance of the sealing cover A1 and facilitates the replacement of the battery pack.

[0054] A method for monitoring and evaluating the shallow groundwater environment of a coastal wetland using the above-mentioned real-time monitoring device for shallow underground environmental information of a coastal wetland comprises the following steps:

[0055] S1: Select several monitoring points evenly in the research area of ​​the coastal wetland, and drill holes downwards at the monitoring points to install pipes 16 with lower ends open, such as Figure 3 As shown, the environmental monitoring device is installed on the support frame 15, and the environmental monitoring device is placed in the pipeline 16 using the support frame 15 to contact the groundwater. The upper end of the environmental monitoring device is connected to the sealing cover B18 through the lifting rope 17;

[0056] S2: A sealing cap B18 is provided at the upper end of the pipeline 16 to prevent seawater from entering. The sealing cap B18 is sealed and connected to a vent pipe 20. The sealing cap B18 is provided with an air pipe joint 19 connected to the vent pipe 20. The end of the vent pipe 20 is connected to a float 21, and the end of the vent pipe 20 passes through the float 21 and is connected to the air. The vent pipe 20 discharges the gas in the pipeline 16.

[0057] The buoy 21 floats up and down with the seawater level, ensuring that the air outlet of the vent pipe 20 is always above the water surface; the floating antenna installation structure can always keep the antenna of the wireless communication module above the water surface after high tide, avoiding the inability to send and receive data due to flooding, and unable to communicate with the backend server. Ensure that the data collected by the monitoring equipment can be sent to the backend server in a timely manner;

[0058] S3: The environmental monitoring device regularly collects water quality data of groundwater in coastal wetlands and constructs a water quality data set at each monitoring point n is the type of water quality data, t is the number of times water quality data is collected, is the nth type of water quality data collected at the tth time;

[0059] S4: constructing an ordered sequence of different water quality data according to the water quality data groups collected from two adjacent water quality data;

[0060]

[0061] Among them, k is the number of times water quality data is collected, r k is the number of abnormal fluctuations in water quality data, s t is the cumulative number of abnormal fluctuations in the nth type of water quality data collected at time t;

[0062] S5: Calculate the statistics U of abnormal fluctuations of each water quality data n ;

[0063]

[0064] Among them, E(s t ) is the mean of the cumulative quantity, V(s t ) is the variance of the cumulative quantity;

[0065] S6: According to the statistics U corresponding to each water quality datan , calculate the water quality stability coefficient f of the groundwater at the monitoring point a ;

[0066]

[0067] Among them, U i is the statistic of the i-th water quality data, i is the type number of the water quality data, α i is the weight coefficient of the i-th water quality data;

[0068] S7: Set water quality stability threshold f 阈值 , if f a >f 阈值 , then it is determined that the water quality stability of the current monitoring point is poor, and step S8 is executed; if f a ≤f 阈值 , it is judged that the water quality stability of the current monitoring point is good;

[0069] S8: Obtain all monitoring points with poor water quality stability in the study area of ​​the coastal wetland, construct a two-dimensional coordinate system in the map plane, and obtain the coordinates of each monitoring point. b ,y b ) to calculate the correlation value, b is the number of the monitoring point with poor water quality stability in the study area of ​​the coastal wetland;

[0070]

[0071] Among them, u b～b-1 is the correlation value between the bth monitoring point with poor water quality stability and the b-1th monitoring point with poor water quality stability,

[0072] S9: If u b～b-1 ≤2l, it is determined that the bth monitoring point with poor water quality stability and the b-1th monitoring point with poor water quality stability are polluted by the same pollution source, otherwise, they are not polluted by the same pollution source, l is the average distance between the monitoring points;

[0073] S10: After screening out all monitoring points polluted by the same pollution source, based on the altitudes of the monitoring points in the coastal wetland, the monitoring point with the highest altitude is taken as the monitoring point closest to the pollution source, and the pollution source is searched with the monitoring point closest to the pollution source as the center;

[0074] S11: Obtain water quality data collected at all monitoring points polluted by the same pollution source for the tth time, and calculate the pollution degree coefficient F of the pollution source;

[0075]

[0076] Among them, (x0, y0) is the coordinate of the center, (x′, y′) is the coordinate of the monitoring point farthest from the center among all the monitoring points polluted by the same pollution source, S is the total area of ​​the study area, e is the number of monitoring points polluted by the same pollution source, E is the total number of monitoring points polluted by the same pollution source, x i～e is the i-th water quality data of monitoring point e, x i ′ is the standard value of the i-th water quality data;

[0077] S12: Set the pollution coefficient threshold F 阈值 , if F ≥ F 阈值 , it is determined that the pollution source has a serious impact on the groundwater pollution in the study area, and it is necessary to eliminate the pollution source in time; otherwise, it is determined that the pollution source has a minor impact on the groundwater pollution in the study area.

[0078] The present invention utilizes a monitoring vertical pipe structure to bury the sensor underground, and with the help of a floating ventilation structure, can effectively isolate the influence of tides on the monitored target water source, and the monitoring result is more accurate; the monitoring sensor can automatically collect suspended sediment concentration, chlorophyll, total carbon, total nitrogen, temperature, salinity and other elements of shallow groundwater at regular intervals, and send the data to the background server through a wireless network communication module, so that users can view the working status of the equipment at each monitoring point and various parameters of shallow groundwater in coastal wetlands in real time; the water quality pollution degree in the study area is comprehensively evaluated through the water quality data collected in real time, the pollution degree of the pollution source is analyzed, and it is ensured that the pollution source can be dealt with in time, so as to provide scientific data support and means for disaster prevention and mitigation in coastal wetlands.

Claims

1. A real-time monitoring device for shallow underground environmental information of coastal wetlands, characterized in that: It includes an outer shell, a sealing cover A is provided at the upper end of the outer shell, a sealing flange is provided at the lower end, a sensor mounting seat is provided on the sealing flange, a plurality of water quality sensors for collecting water quality data are installed on the sensor mounting seat, the water quality sensors are arranged in a sensor protection cover, and the sensor protection cover is fixed on the sensor mounting seat, a battery and a control circuit board are provided in the outer shell, and the battery and the plurality of water quality sensors are electrically connected to the control circuit board.

2. The real-time monitoring device for shallow underground environmental information of coastal wetlands according to claim 1 is characterized in that: An upper fixing seat and a lower fixing seat are arranged in the outer shell, and a groove for clamping the battery is arranged on the upper fixing seat and the lower fixing seat.

3. The real-time monitoring device for shallow underground environmental information of coastal wetlands according to claim 2 is characterized in that: The groove is a square structure, and arc chamfers are arranged at the corners of the groove.

4. The real-time monitoring device for shallow underground environmental information of coastal wetlands according to claim 1 is characterized in that: The sealing flange is an annular structure, and the sealing flange is detachably connected to the outer shell. The inner wall of the sealing flange is provided with a ridge, and the edge of the control circuit board is provided with a groove engaged with the ridge.

5. The real-time monitoring device for shallow underground environmental information of coastal wetlands according to claim 4 is characterized in that: A sealing ring is arranged on the surface of the sealing flange that contacts the sensor mounting seat, and the sealing ring is squeezed and fitted with the sensor mounting seat to seal.

6. The real-time monitoring device for shallow underground environmental information of coastal wetlands according to claim 1 is characterized in that: The sensor mounting seat is provided with a plurality of mounting holes for mounting water quality sensors.

7. The real-time monitoring device for shallow underground environmental information of coastal wetlands according to claim 1 is characterized in that: The sealing cover A is threadedly connected to the outer shell, and the sealing cover A is provided with a boss that matches the outer shell.

8. A method for monitoring and evaluating the shallow groundwater environment of a coastal wetland using the real-time monitoring device for shallow underground environmental information of a coastal wetland according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Select several monitoring points evenly in the research area of ​​coastal wetlands, drill holes downwards at the monitoring points to install pipes with lower openings, install environmental monitoring devices on support frames, and use the support frames to place the environmental monitoring devices into the pipes to contact groundwater; S2: A sealing cover A is provided at the upper end of the pipeline to prevent seawater from entering. The sealing cover A is sealed and connected to a vent pipe. The end of the vent pipe is connected to a floating ball, and the end of the vent pipe passes through the floating ball and is connected to the air. The vent pipe discharges the gas in the pipeline. The floating ball floats up and down with the height of the seawater level to ensure that the air outlet of the vent pipe is always above the water surface. S3: The environmental monitoring device regularly collects water quality data of groundwater in coastal wetlands and constructs a water quality data set at each monitoring point n is the type of water quality data, t is the number of times water quality data is collected, is the nth type of water quality data collected at the tth time; S4: constructing an ordered sequence of different water quality data according to the water quality data groups collected from two adjacent water quality data; Among them, k is the number of times water quality data is collected, r k is the number of abnormal fluctuations in water quality data, s t is the cumulative number of abnormal fluctuations in the nth type of water quality data collected at time t; S5: Calculate the statistics U of abnormal fluctuations of each water quality data n ; Among them, E(s t ) is the mean of the cumulative quantity, V(s t ) is the variance of the cumulative quantity; S6: According to the statistics U corresponding to each water quality data n , calculate the water quality stability coefficient f of the groundwater at the monitoring point a ; Among them, U i is the statistic of the i-th water quality data, i is the type number of the water quality data, α i is the weight coefficient of the i-th water quality data; S7: Set water quality stability threshold f 阈值 , if f a >f 阈值 , then it is determined that the water quality stability of the current monitoring point is poor, and step S8 is executed; if f a ≤f 阈值 , it is judged that the water quality stability of the current monitoring point is good; S8: Obtain all monitoring points with poor water quality stability in the study area of ​​the coastal wetland, construct a two-dimensional coordinate system in the map plane, and obtain the coordinates of each monitoring point. b ,y b ) to calculate the correlation value, b is the number of the monitoring point with poor water quality stability in the study area of ​​the coastal wetland; Among them, u b～b-1 is the correlation value between the bth monitoring point with poor water quality stability and the b-1th monitoring point with poor water quality stability, S9: If u b～b-1 ≤2l, it is determined that the bth monitoring point with poor water quality stability and the b-1th monitoring point with poor water quality stability are polluted by the same pollution source, otherwise, they are not polluted by the same pollution source, l is the average distance between the monitoring points; S10: After screening out all monitoring points polluted by the same pollution source, based on the altitudes of the monitoring points in the coastal wetland, the monitoring point with the highest altitude is taken as the monitoring point closest to the pollution source, and the pollution source is searched with the monitoring point closest to the pollution source as the center; S11: Obtain water quality data collected at all monitoring points polluted by the same pollution source for the tth time, and calculate the pollution degree coefficient F of the pollution source; Among them, (x0, y0) is the coordinate of the center, (x′, y′) is the coordinate of the monitoring point farthest from the center among all the monitoring points polluted by the same pollution source, S is the total area of ​​the study area, e is the number of monitoring points polluted by the same pollution source, E is the total number of monitoring points polluted by the same pollution source, x i～e is the i-th water quality data of monitoring point e, x i ′ is the standard value of the i-th water quality data; S12: Set the pollution coefficient threshold F 阈值 , if F ≥ F 阈值 , it is determined that the pollution source has a serious impact on the groundwater pollution in the study area, and it is necessary to eliminate the pollution source in time; otherwise, it is determined that the pollution source has a minor impact on the groundwater pollution in the study area.

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