Geomembrane leakage monitoring system and method

Abstract

The invention provides a geomembrane leakage monitoring system and method.The geomembrane leakage monitoring system comprises a signal collecting system and a monitoring system, the signal collecting system comprises a plurality of sensor sets connected in parallel, and the sensor sets are connected with the monitoring system through cables; the sensor group comprises a transmitting electrode arranged on the upper layer of the geomembrane and a receiving electrode arranged on the lower layer of the geomembrane, and the receiving electrode and the transmitting electrode are both connected with the monitoring system; the monitoring system comprises a signal receiving unit, a signal processing unit and a display unit, the signal receiving unit is used for receiving current signals of all the sensor groups, the signal processing unit is used for conducting signal conditioning on the current signals, analyzing the leakage risk and matching electric signals of all the sensor groups with position information, and the display unit is used for displaying the matched electric signals. And the display unit is used for performing two-dimensional visual display and three-dimensional visual display on the processed data in combination with the geological data of the to-be-detected area. According to the invention, the geomembrane leakage can be accurately monitored and visually displayed, and the environmental risk caused by the geomembrane leakage is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of environmental technology and relates to a geomembrane leakage monitoring system and method. Background Art

[0002] Geomembrane leakage monitoring is a key link to ensure environmental protection and engineering safety. Currently, the main methods used include visual inspection method and penetration method, etc. The visual inspection method directly observes the leakage signs on the surface of the geomembrane, but this method is inefficient and inaccurate, and can only detect obvious problems; the penetration method judges the leakage situation through the penetration of a specific liquid on the surface of the geomembrane. However, its detection effect on small holes or tiny breakage points is not good, and it is easily interfered by environmental factors.

[0003] The above traditional monitoring methods generally have certain defects, which limit their wide application and technological progress. In addition, designing a monitoring system that can not only meet the functional requirements but also adapt to the actual on-site situation for different application scenarios and geological conditions is also a difficult problem. The existence of these problems not only affects the reliability of the monitoring results, but also increases the deployment cost and maintenance difficulty of the system.

[0004] Therefore, the present invention aims to provide a new geomembrane leakage monitoring method and its device, in order to solve the deficiencies existing in the prior art, improve the monitoring efficiency and accuracy, and reduce the application cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a geomembrane leakage monitoring system and method for solving the problems existing in the prior art in view of the defects of the prior art.

[0006] In the first aspect of the present invention, a geomembrane leakage monitoring system is provided, including a signal collection system and a monitoring system: The signal collection system includes multiple groups of parallel sensor groups, and each sensor group is connected to the monitoring system through a cable; Each sensor group includes a transmitting electrode arranged on the upper layer of the geomembrane and a receiving electrode installed on the lower layer of the geomembrane. The transmitting electrode is a stainless steel cylinder, and the receiving electrode is a titanium alloy disc. The transmitting electrode is connected to a transmitting cable, and the receiving electrode is connected to a receiving cable. Both the transmitting cable and the receiving cable are connected to the monitoring system; The monitoring system includes a signal receiving unit, a signal processing unit, and a display unit. The signal receiving unit is used to receive the current signals of each sensor group. The signal processing unit is used to perform signal conditioning on the current signals, analyze the leakage risk, and match the electrical signals of each sensor group with the position information. The display unit is used to perform two-dimensional visualization display and three-dimensional visualization display on the processed data combined with the geological data of the area to be detected.

[0007] Preferably, the signal conditioning includes eliminating telluric noise and cultural noise through noise reduction processing.

[0008] Preferably, the transmitting cables and receiving cables of multiple sensor groups both adopt special cables for electrical method AB.

[0009] In the second aspect of the present invention, a method for monitoring geomembrane leakage is provided, which adopts the geomembrane leakage monitoring system described in any one of the above, and specifically includes: Survey: Conduct geological surveys on the area to be monitored, divide the area to be monitored into easy leakage areas and conventional monitoring areas according to the leakage risk level, and divide the area to be monitored into flat monitoring areas and slope monitoring areas according to the terrain characteristics; Sensor group installation: When arranging sensor groups in the flat monitoring area, the distance between adjacent two sensor groups is not greater than 8m. When arranging sensor groups in the slope monitoring area, the distance between adjacent two sensor groups is not greater than 20m. Among them, the receiving electrodes are installed inside two layers of closed geomembranes, and the transmitting electrodes are installed on the upper part of the upper geomembrane; Cable connection: Connect the transmitting electrodes with the transmitting cables, connect the receiving electrodes with the receiving cables. The receiving cables and transmitting cables are both protected by HDPE sleeves, and after leading the transmitting cables and receiving cables out of the area to be detected, connect them to the monitoring system; Signal acquisition: After the transmitting electrodes emit current signals, high-frequency acquisition is carried out on each receiving cable at a sampling frequency of 250KS / s; Signal conditioning: Eliminate telluric noise and cultural noise through noise reduction processing, and process the electrical signals; Data display: The conditioned electrical signals are two-dimensionally visualized and three-dimensionally visualized through the display unit in combination with the geological information of the area to be detected. Preferably, the sensor groups are arranged at the lowest elevation point in the adjacent area.

[0010] Preferably, the receiving electrodes and the receiving cables are connected by spot welding, and the welding points are sealed with epoxy resin vertically.

[0011] Preferably, the two-dimensional visualization is to two-dimensionally visualize the sampling data according to the sampling point coordinates, and intuitively mark the sampling values of each sampling point; and: present a one-dimensional data curve graph according to the sampling values to show the sampling value distribution map of each sampling point.

[0012] Preferably, the three-dimensional visualization is to realize contour line display according to the sampling point coordinates and sampling values.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides an efficient and accurate geomembrane leakage monitoring system and method, which has significant beneficial effects compared with the prior art. First, by adopting multiple groups of parallel sensor groups, the system can achieve comprehensive coverage of a large area, and flexibly adjust the spacing between sensor groups under different terrain conditions to optimize the monitoring accuracy, ensuring that potential leakage risks can be accurately captured even in complex environments. Second, by using a special electric method AB cable for signal transmission and combining with an efficient noise reduction processing technology, the influence of geoelectric noise and human noise is effectively eliminated, improving the reliability and accuracy of data acquisition.

[0014] 2. The monitoring system of the present invention can not only conduct detailed conditioning and analysis on current signals, but also fuse the electrical signals with geological data. Through multi-dimensional displays such as two-dimensional plane visualization, one-dimensional curve graphs, and three-dimensional contour lines, the intuitiveness and accuracy of leakage point identification are significantly improved, reducing the dependence on manual interpretation, and providing an efficient, low-cost, and scalable monitoring solution for large-scale projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the monitoring principle of the present invention.

[0016] Figure 2 It is an effect diagram of three-dimensional visualization display in an embodiment of the present invention.

[0017] Figure 3 It is a monitoring data graph in an embodiment of the present invention.

[0018] Figure 4 It is an effect diagram of two-dimensional visualization display in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the preferred implementation solutions of the present invention will be described below in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent; for better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, and do not represent the actual size of the product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationships described in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent.

[0020] First of all, it is necessary to explain the terms involved in the present invention. In the description of the present invention, "electrical method AB dedicated cable" refers to a cable used in a specific geophysical exploration method, "electrical method" refers to electrical exploration (Electrical Resistance Method), and "AB" represents a power supply electrode pair, namely points A and B, which are used to send current to the underground.

[0021] As an embodiment of the present invention, refer to Figure 1 , this embodiment provides a geomembrane leakage monitoring system, including a signal collection system and a monitoring system: The signal collection system includes multiple sets of parallel sensor groups, each of which is connected to the monitoring system via cables; The sensor group includes a transmitting electrode arranged on the upper layer of the geomembrane and a receiving electrode installed on the lower layer of the geomembrane, the transmitting electrode is a stainless steel cylinder, the receiving electrode is a titanium alloy disc, the transmitting electrode is connected to the transmitting cable, the receiving electrode is connected to the receiving cable, and the transmitting cable and the receiving cable are both connected to the monitoring system; The monitoring system includes a signal receiving unit, a signal processing unit and a display unit. The signal receiving unit is used to receive the current signal of each sensor group. The signal processing unit is used to perform signal conditioning on the current signal, analyze the leakage risk, and match the electrical signal of each sensor group with the position information. The display unit is used to combine the processed data with the geological data of the area to be detected for two-dimensional and three-dimensional visualization, thereby realizing accurate conditioning, analysis and visualization of the current signal, which helps to quickly locate the leakage point and improve the speed and accuracy of problem solving.

[0022] The basic principle of the anti-seepage layer leakage monitoring technology of the present invention is to use the insulation of the HDPE film and the conductivity of the medium on both sides of the HDPE film, place a transmitting electrode on the HDPE film, and place a receiving electrode under the film. When the HDPE film is intact, due to the high resistance of the film, the loop current is small, so the potential distribution of each point in the current field is uniform; if the film is damaged, its high resistance characteristic is destroyed, and the current will flow out from the positive electrode of the signal source and return to the negative electrode of the signal source through the hole, thereby forming a signal flow loop and forming a stable signal flow field in the medium above and below the film. At this time, by measuring the distribution of induced electrical signals at different points in the medium above or below the membrane, the leak is located through numerical analysis and model exercises.

[0023] In the above embodiments, to improve the quality of the signal, reduce the influence of external interference on the monitoring results, and enhance the reliability and accuracy of the data, the signal conditioning includes eliminating telluric noise and anthropogenic noise through noise reduction processing. In the above embodiments, by setting multiple groups of parallel sensor groups, effective coverage and real-time monitoring of a large area can be achieved. This design improves the monitoring efficiency and accuracy. Using a stainless steel cylinder as the transmitting electrode and a titanium alloy disc as the receiving electrode ensures the corrosion resistance and conductivity of the electrode, extends the service life, and guarantees the stability of signal transmission.

[0024] In some preferred embodiments, the transmitting cables and receiving cables of multiple groups of sensor groups both use special AB cables for electrical methods. Using special AB cables for electrical methods can improve the stability of signal transmission and anti-interference ability. Especially during long-distance transmission, signal attenuation and distortion are effectively avoided, ensuring high-quality data acquisition.

[0025] In some embodiments, a method for monitoring geomembrane leakage uses the geomembrane leakage monitoring system described in any of the above embodiments, and specifically includes: Survey: Conduct geological surveys on the area to be monitored. Divide the area to be monitored into areas prone to leakage and regular monitoring areas according to the leakage risk level, and divide the area to be monitored into flat monitoring areas and slope monitoring areas according to the terrain characteristics, so as to implement a more targeted monitoring strategy, optimize resource allocation, and improve monitoring efficiency; Installation of sensor groups: When arranging sensor groups in flat monitoring areas, the distance between adjacent two groups of sensor groups is not greater than 8m. When arranging sensor groups in slope monitoring areas, the distance between adjacent two groups of sensor groups is not greater than 20m. Among them, the receiving electrode is installed inside two layers of closed geomembranes, and the transmitting electrode is installed on the upper part of the upper geomembrane. In this embodiment, different sensor group spacings are used in flat and slope areas to meet the monitoring requirements under different terrain conditions, ensuring both monitoring accuracy and cost reduction; Cable connection: Connect the transmitting electrode to the transmitting cable, and connect the receiving electrode to the receiving cable. Both the receiving cable and the transmitting cable are protected by HDPE sleeves, enhancing the cable protection performance, preventing damage caused by external factors, ensuring the reliability of long-term use, and finally leading the transmitting cable and the receiving cable out of the area to be detected and connecting them to the monitoring system; Signal acquisition: After the transmitting electrode emits a current signal, high-frequency acquisition is performed on each receiving cable at a sampling frequency of 250KS / s. Using a high sampling frequency of 250KS / s for signal acquisition can capture finer signal changes and improve the resolution and accuracy of the data; Signal conditioning: Eliminate telluric noise and anthropogenic noise through noise reduction processing, and process the electrical signal; Data display: The conditioned electrical signal is subjected to two-dimensional visualization display and three-dimensional visualization display through the display unit by fusing with the geological information of the area to be detected.

[0026] In the above embodiment, the conditioned electrical signal is fused with the geological information for visualization display, which not only intuitively shows the data distribution of each sampling point, but also provides a more three-dimensional view through the isoline display, facilitating users to comprehensively understand the status of the monitoring area and accelerating the decision-making process.

[0027] In some embodiments, the sensor group is arranged at the lowest elevation point of the adjacent area.

[0028] In some preferred embodiments, the receiving electrode and the receiving cable are connected by spot welding, and the solder joints are sealed by pouring epoxy vertically.

[0029] In some preferred embodiments, the two-dimensional visualization is to perform two-dimensional plane visualization display on the sampling data according to the sampling point coordinates, and intuitively mark the sampling values of each sampling point; and: according to the sampling values, present a one-dimensional data curve graph to display the sampling value distribution map of each sampling point.

[0030] In some preferred embodiments, the three-dimensional visualization is to realize isoline display according to the sampling point coordinates and sampling values.

[0031] Taking a certain phosphogypsum centralized storage as an example, the transmitting electrode has a diameter of 12 mm and a length of 10 cm. The tap and the cable are kept sealed to form an integrated sensor cable, which is convenient for layout and installation. During layout, the positions of the detection sensors are reasonably arranged according to the size of the site. The bottom of the storage area of the reservoir is arranged in a 20m×20m grid, the slope is arranged in a 30m×30m grid, and the electrode is densely arranged in the electrical signal nodal areas of the regulating pond and the clarifying pond. The regulating pond is arranged in an 8m×8m grid, and the clarifying pond is arranged in an 8m×8m grid. There shall be no breakpoints and joints in the middle of the detection cable. A protective sleeve is added for protection when laying across the road. It enters from one side of the storage area, enters the cable trench after being set up, and then exits the storage area and enters the control room near the site area.

[0032] The material of the signal receiving electrode is a titanium alloy disc with a diameter of ø16 cm and a thickness of 3 mm. The connection method is spot welding, and the solder joints are protected by pouring epoxy resin. The receiving cable connecting the receiving electrode is a special cable for electrical method AB. The layout positions of the receiving electrodes are mainly based on three principles: they should be arranged at the lowest point of the centralized storage; the length of the receiving cable in the centralized storage should be shortened as much as possible to facilitate cable maintenance after the gypsum is landfilled; the routing from the off-site lead-out point to the monitoring room takes the shortest path. There are receiving electrodes and receiving cables (8) under the sodium bentonite blanket in the storage area, receiving electrodes and receiving cables (5) under the membrane of the regulating pond, and receiving electrodes and receiving cables (3) under the membrane of the clarifying pond.

[0033] For the launch cables in the centralized storage area, protective measures such as pre-wrapping and pipe threading are adopted. A special transfer box is installed beside the centralized storage area to transfer the cables inside and outside the site. The transferred cables enter the cable trench in the site area and are protected by pipe threading through a transfer well. After passing through measures such as road pipes, wall penetrations, and cable bridges, they finally enter the control room and are connected to the equipment.

[0034] When the monitoring system is arranged according to the method of the present invention, the visualization effect is as Figures 2 - 4 shown. Through two-dimensional visualization display and three-dimensional visualization display, not only can the monitoring data be queried at any time, but also the leakage risk areas can be intuitively reflected, which is convenient for technicians to make quick decisions.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A geomembrane leakage monitoring system, characterized in that: Including signal collection system and monitoring system: The signal collection system includes multiple sets of parallel sensor groups, each of which is connected to the monitoring system via cables; The sensor group includes a transmitting electrode arranged on the upper layer of the geomembrane and a receiving electrode installed on the lower layer of the geomembrane, the transmitting electrode is a stainless steel cylinder, the receiving electrode is a titanium alloy disc, the transmitting electrode is connected to the transmitting cable, the receiving electrode is connected to the receiving cable, and the transmitting cable and the receiving cable are both connected to the monitoring system; The monitoring system includes a signal receiving unit, a signal processing unit and a display unit. The signal receiving unit is used to receive the current signal of each sensor group. The signal processing unit is used to perform signal conditioning on the current signal, analyze the leakage risk, and match the electrical signal of each sensor group with the position information. The display unit is used to combine the processed data with the geological data of the area to be detected for two-dimensional and three-dimensional visualization.

2. A geomembrane leakage monitoring system according to claim 1, characterized in that: The signal conditioning includes eliminating geoelectric noise and human noise through noise reduction processing.

3. A geomembrane leakage monitoring system according to claim 1, characterized in that: The transmitting cables and receiving cables of multiple sensor groups are all made of Dianfa AB special cables.

4. A method for monitoring geomembrane leakage according to claim 1, characterized in that: The geomembrane leakage monitoring system according to any one of claims 1 to 3 specifically comprises: Survey: Conduct geological surveys on the monitored area, divide the monitored area into leakage-prone areas and conventional monitoring areas according to the leakage risk level, and divide the monitored area into flat monitoring areas and slope monitoring areas according to the terrain characteristics; Sensor group installation: When the sensor group is deployed in the flat monitoring area, the distance between two adjacent sensor groups is no more than 8m; when the sensor group is deployed in the slope monitoring area, the distance between two adjacent sensor groups is no more than 20m. The receiving electrode is installed in two closed geomembranes, and the transmitting electrode is installed on the upper part of the upper geomembrane; Cable connection: connect the transmitting electrode to the transmitting cable, and connect the receiving electrode to the receiving cable. Both the receiving cable and the transmitting cable are protected by HDPE casing. Lead the transmitting cable and the receiving cable out of the detection area and connect them to the monitoring system. Signal acquisition: After the transmitting electrode transmits the current signal, a high-frequency acquisition with a sampling frequency of 250KS / s is used to collect the signal of each receiving cable; Signal conditioning: eliminate ground noise and human noise through noise reduction processing, and process the electrical signal; Data display: The conditioned electrical signal is integrated with the geological information of the area to be detected through a display unit for two-dimensional visualization and three-dimensional visualization.

5. A method for monitoring geomembrane leakage according to claim 4, characterized in that: The sensor group is arranged at the lowest point in elevation of the adjacent area.

6. A method for monitoring geomembrane leakage according to claim 4, characterized in that: The receiving electrode and the receiving cable are connected by spot welding, and the welding points are sealed vertically by epoxy injection.

7. A geomembrane leakage monitoring system according to claim 4, characterized in that: The two-dimensional visualization is to perform a two-dimensional plane visualization display of the sampling data according to the sampling point coordinates, and intuitively mark the sampling values ​​of each sampling point; And: according to the sampling values, a one-dimensional data curve graph is presented to show the distribution graph of the sampling values ​​of each sampling point.

8. A method for monitoring geomembrane leakage according to claim 4, characterized in that: The three-dimensional visualization is to realize isoline display according to the sampling point coordinates and sampling values.

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