Groundwater overexploitation early warning system and groundwater level monitoring method

Abstract

The present invention provides a groundwater over-exploitation early warning system and a groundwater level monitoring method, wherein the groundwater over-exploitation early warning system includes a pipe well, a well cover, a gas pressure sensor, a control component, an alarm component, and a gas compensation component; the lower end of the pipe well is provided with a water inlet, and the upper end is a wellhead; the well cover is provided on the wellhead of the pipe well and is sealed with the pipe well; the gas pressure sensor is provided in the pipe well; the control component is communicatively connected to the gas pressure sensor; the alarm component is communicatively connected to the control component; the gas compensation component is connected to the pipe well and is electrically connected to the control component to compensate for changes in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well. The groundwater level monitoring method uses the above-mentioned groundwater over-exploitation early warning system to measure the groundwater level. The groundwater over-exploitation early warning system and the groundwater level monitoring method provided by the present invention can monitor the groundwater level when the pipe well is closed.

Description

Technical Field

[0001] The present invention belongs to the technical field of groundwater level measurement, and in particular relates to a groundwater over-exploitation early warning system and a groundwater level monitoring method. Background Art

[0002] Groundwater is an important mineral resource. Excessive extraction of groundwater will cause serious harm to the geographical environment. Therefore, it is necessary to monitor the groundwater level and issue an alarm in time when the groundwater level is lower than the warning value.

[0003] At present, most observation wells for groundwater level monitoring are open, and most monitoring equipment is deep inside the well. On the one hand, the open wellhead makes it easy for pollutants to enter the groundwater directly, causing groundwater pollution. On the other hand, for high water level groundwater head, its head height may exceed the wellhead during the flood season, causing groundwater to continuously gush out of the wellhead, resulting in a waste of water resources. In addition, the monitoring equipment is deep inside the well, making it difficult to inspect and repair the equipment after it fails. Summary of the Invention

[0004] The embodiments of the present invention provide a groundwater over-exploitation early warning system and a groundwater level monitoring method, which aim to solve the technical problems that groundwater is easily polluted due to the opening of observation wells, groundwater is easily gushing out from the wellhead during the flood season, and monitoring equipment is deep in the well, making it difficult to inspect and maintain.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, an embodiment of the present invention provides a groundwater overexploitation early warning system, comprising:

[0007] A pipe well, with a water inlet at the lower end and a wellhead at the upper end, wherein the water inlet is always below the groundwater level;

[0008] A manhole cover is provided on the wellhead of the pipe well and is sealed with the pipe well;

[0009] a gas pressure sensor, disposed in the manhole and connected to the manhole or the manhole cover;

[0010] a control component, communicatively connected to the gas pressure sensor, for receiving gas pressure information in the pipe well transmitted by the gas pressure sensor, and processing and obtaining groundwater level information at the location of the pipe well;

[0011] an alarm component, communicatively connected to the control component, and configured to issue an alarm when the groundwater level information at the location of the tube well obtained by the control component is lower than a warning value; and

[0012] The gas compensation component is communicated with the pipe well and electrically connected to the control component, and is used to compensate for the change in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well.

[0013] In combination with the first aspect, in a possible implementation of a groundwater over-exploitation early warning system provided by the present invention, the gas compensation component includes a gas analyzer, an air pump and a flow valve. The gas analyzer is connected to the pipe well for analyzing the gas composition in the pipe well. The air pump is connected and communicated with the flow valve, and the flow valve is connected and communicated with the pipe well.

[0014] In combination with the first aspect, in a possible implementation of a groundwater over-exploitation early warning system provided by the present invention, the pipe well includes a bottom pipe and multiple extension pipes, the water inlet is provided at the lower part of the bottom pipe, and the multiple extension pipes are stacked in sequence on the upper side of the bottom pipe.

[0015] In combination with the first aspect, in a possible implementation of a groundwater over-exploitation early warning system provided by the present invention, the bottom of the bottom pipe is closed, and from bottom to top are a water inlet section and a connecting section, a plurality of water inlets are opened on the pipe wall of the water inlet section, and a first grouting groove is opened axially on the pipe wall of the connecting section, and the first grouting groove is connected to the top of the bottom pipe; the extension pipe includes an inner pipe, an outer pipe and a plurality of connecting ribs, the inner pipe and the outer pipe are spaced apart to form a second grouting groove, and a plurality of connecting ribs are arranged between the inner pipe and the outer pipe, and each connecting rib is respectively connected to the outer pipe and the inner pipe, and the second grouting groove is connected to the first grouting groove.

[0016] In combination with the first aspect, in a possible implementation of a groundwater over-exploitation early warning system provided by the present invention, it also includes a filter component, which is arranged at the water inlet in the pipe well and connected to the pipe well.

[0017] In combination with the first aspect, in a possible implementation of a groundwater over-exploitation early warning system provided by the present invention, the filter assembly includes a filter cartridge and a filter net, a receiving groove is provided in the cylinder wall of the filter cartridge, and a plurality of water holes passing through the receiving groove and the filter cartridge are provided, and the filter net is arranged in the receiving groove.

[0018] In combination with the first aspect, in a possible implementation of a groundwater over-exploitation early warning system provided by the present invention, the filter assembly further includes a retaining ring, a support plate, a receiving ring, a connecting plate, a flexible sleeve and a driving assembly, there are two filter screens, and each of the filter screens is connected end to end; there are two support plates, and the two support plates are respectively symmetrically arranged at the bottom of the receiving tank about the axis of the filter cartridge and connected to the filter cartridge, the retaining ring is horizontally arranged and connected to the support plate; there are two connecting plates, and the two connecting plates are respectively symmetrically arranged at the upper end of the pipe well about the axis of the pipe well, the receiving ring is horizontally arranged and connected to the connecting plate, and the flexible sleeve is sleeved on the receiving ring; the two filter screens are respectively arranged on both sides of the two support plates, one end is sleeved on the retaining ring, and the other end is sleeved on the receiving ring; the driving assembly is connected to the connecting plate, and the power output end is connected to the flexible sleeve to drive the flexible sleeve to rotate on the receiving ring, thereby driving the filter screen to move on the retaining ring and the receiving ring.

[0019] In combination with the first aspect, in a possible implementation of a groundwater over-exploitation early warning system provided by the present invention, the warning component includes a buzzer, and the buzzer is electrically connected to the control component.

[0020] In a second aspect, an embodiment of the present invention provides a groundwater level monitoring method, which applies the above-mentioned groundwater overexploitation early warning system and includes the following steps:

[0021] A. Setting the tube well at a preset position;

[0022] B. Using a water level detection device to detect the water level in the pipe well, record it as a1, and store it in the control component;

[0023] C. Cover the manhole cover to seal the manhole, detect the pressure change in the manhole with a gas pressure sensor, calculate the water level change through the control component, and then sum it with a1 to obtain the real-time water level in the manhole;

[0024] D. At preset time intervals, the gas compensation component compensates for changes in the total amount of gas in the tube well caused by the respiration of microorganisms in the tube well.

[0025] In conjunction with the second aspect, in a possible implementation of a groundwater level monitoring method provided by the present invention, step D specifically includes the following steps:

[0026] D1. Analyze the changes in the gas composition in the pipe well by a gas analyzer, and then calculate the change in the gas in the pipe well by the control component;

[0027] D2. Control the air pump and the flow valve through the control component to fill air into the pipe well or extract air from the pipe well so that the total amount of gas in the pipe well remains constant.

[0028] The beneficial effects of the groundwater over-exploitation early warning system provided by the present invention are as follows: compared with the existing technology, the pipe well and the manhole cover in the groundwater over-exploitation early warning system provided by the present invention are sealed and connected, which can effectively prevent external pollutants from directly entering the groundwater, thereby protecting the groundwater from being polluted, and in the flood season, groundwater cannot emerge from the wellhead; a gas pressure sensor is set in the pipe well, and after the groundwater level changes, since the wellhead is a sealed structure, the water level change will cause the air in the well to compress or expand, and the groundwater level is determined by the relationship between the water level change value and the air pressure in the well, and when the water level is lower than the warning value, the warning component issues an alarm, and since the gas pressure in the pipe well is equal everywhere, the gas pressure sensor can be directly set at the wellhead position without having to go deep into the well, which is convenient for inspection and maintenance; at the same time, a gas compensation component is set to compensate for the change in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well, which can improve the accuracy of the measured groundwater level.

[0029] The beneficial effects of the groundwater level monitoring method provided by the present invention are as follows: compared with the existing technology, the groundwater level monitoring method provided by the present invention can monitor the groundwater level when the pipe well is closed, which can effectively prevent external pollutants from directly entering the groundwater, thereby protecting the groundwater from being polluted, and during the flood season, groundwater cannot emerge from the wellhead; at the same time, through the gas compensation component, it is used to compensate for the changes in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well, which can effectively improve the accuracy of the measured groundwater level. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the main structure of a groundwater over-exploitation early warning system provided by an embodiment of the present invention;

[0031] Figure 2 For the Figure 1 Cross-sectional structural diagram along line AA;

[0032] Figure 3 For the Figure 2 Cross-sectional structural diagram along line BB;

[0033] Figure 4 For the Figure 2 Cross-sectional structural diagram along the CC line;

[0034] Figure 5 for Figure 2 Enlarged view of part D in FIG;

[0035] Figure 6 for Figure 2 Enlarged view of part E in FIG;

[0036] Description of reference numerals:

[0037] 11. Bottom pipe; 12. Extension pipe; 13. Water inlet; 14. First grouting trough;

[0038] 15. Second grouting trough; 16. Connecting ribs; 20. Manhole cover; 30. Gas pressure sensor;

[0039] 40. Control component; 50. Warning component; 61. Gas analyzer; 62. Air pump; 63. Flow valve;

[0040] 71. Filter cartridge; 72. Filter screen; 73. Retaining ring; 74. Support plate;

[0041] 75. Adapter ring; 76. Connecting plate; 77. Flexible sleeve; 78. Drive assembly. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0046] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used herein are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0049] Please also refer to Figures 1 to 6The groundwater overdraft warning system provided by the present invention is now described. The groundwater overdraft warning system includes a pipe well, a well cover 20, a gas pressure sensor 30, a control component 40, an alarm component 50, and a gas compensation component. The pipe well has a water inlet 13 at its lower end and a wellhead at its upper end, and the water inlet 13 is always below the groundwater level. The well cover 20 is located on the wellhead of the pipe well and is sealed to the pipe well. The gas pressure sensor 30 is located within the pipe well and is connected to the pipe well or the well cover 20. The control component 40 is communicatively connected to the gas pressure sensor 30 to receive gas pressure information within the pipe well transmitted by the gas pressure sensor 30 and process it to obtain groundwater level information at the location of the pipe well. The alarm component 50 is communicatively connected to the control component 40 to issue an alarm when the groundwater level information at the location of the pipe well obtained by the control component 40 falls below a warning value. The gas compensation component is connected to the pipe well and is electrically connected to the control component 40 to compensate for changes in the total amount of gas within the pipe well caused by microbial respiration within the pipe well.

[0050] Specifically, the control component 40 is a PLC controller, a computer or other equipment with data processing and signal receiving and sending functions; the warning component 50 can be a buzzer, a warning light, a horn or other equipment that can emit sound or light that is easily perceived by people; the gas pressure sensor 30 is an existing gas pressure sensor selected according to needs; the warning value is the groundwater level height value set according to actual needs.

[0051] The beneficial effects of the groundwater over-exploitation early warning system provided by the embodiment of the present invention are as follows: compared with the prior art, the pipe well and the manhole cover 20 in the groundwater over-exploitation early warning system provided by the embodiment of the present invention are sealed and can effectively prevent external pollutants from directly entering the groundwater, thereby protecting the groundwater from being polluted, and in the flood season, groundwater cannot emerge from the wellhead; a gas pressure sensor 30 is set in the pipe well, and after the groundwater level changes, since the wellhead is a sealed structure, the water level change will cause the air in the well to compress or expand, and the groundwater level is determined by the relationship between the water level change value and the air pressure in the well, and when the water level is lower than the warning value, the warning component 50 issues an alarm, and since the gas pressure in the pipe well is equal everywhere, the gas pressure sensor 30 can be directly set at the wellhead position without having to go deep into the well, which is convenient for inspection and maintenance; at the same time, a gas compensation component is set to compensate for the change in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well, which can improve the accuracy of the measured groundwater level.

[0052] like Figure 1 and Figure 2As shown, in a specific embodiment of a groundwater over-exploitation early warning system provided by the present invention, the gas compensation component includes a gas analyzer 61, an air pump 62 and a flow valve 63. The gas analyzer 61 is connected to the pipe well for analyzing the gas composition in the pipe well. The air pump 62 is connected and communicated with the flow valve 63, and the flow valve 63 is connected and communicated with the pipe well.

[0053] Specifically, the gas analyzer 61, the air pump 62 and the flow valve 63 are all electrically connected to the control component 40. The control component 40 controls the gas analyzer 61 to analyze the changes in the composition of the gas in the pipe well at preset time intervals, and transmits the data to the control component 40. The control component 40 processes the data to obtain the change in the amount of gas in the pipe well, and then controls the air pump 62 to fill the pipe well or extract a certain amount of gas from the pipe well to compensate for the change in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well, thereby ensuring the accuracy of the measurement results.

[0054] like Figure 1 and Figure 2 As shown, in a specific embodiment of a groundwater over-exploitation early warning system provided by the present invention, the pipe well includes a bottom pipe 11 and multiple extension pipes 12, a water inlet 13 is provided at the lower part of the bottom pipe 11, and multiple extension pipes 12 are stacked on the upper side of the bottom pipe 11 in sequence.

[0055] Further, such as Figure 1 and Figure 2 As shown, in a specific embodiment of a groundwater over-exploitation early warning system provided by the present invention, the bottom of the bottom pipe 11 is closed, and from bottom to top are a water inlet section and a connecting section, a plurality of water inlets 13 are opened on the pipe wall of the water inlet section, and a first grouting groove 14 is opened axially on the pipe wall of the connecting section, and the first grouting groove 14 is connected to the top of the bottom pipe 11; the extension pipe 12 includes an inner pipe, an outer pipe and a plurality of connecting ribs 16, the inner pipe and the outer pipe are spaced apart to form a second grouting groove 15, and the plurality of connecting ribs 16 are all arranged between the inner pipe and the outer pipe, and each connecting rib 16 is respectively connected to the outer pipe and the inner pipe, and the second grouting groove 15 is connected to the first grouting groove 14.

[0056] It should be noted that after the bottom pipe 11 and the multiple extension pipes 12 are installed, the multiple second grouting grooves 15 from top to bottom are connected to the first grouting groove 14 at the bottom, and then grouting is done inward to form a sealed whole with the bottom pipe 11 and the multiple extension pipes 12 to prevent air from escaping in the pipe well.

[0057] like Figure 1 and Figure 2 As shown, in a specific embodiment of the groundwater over-exploitation early warning system provided by the present invention, it also includes a filter component, which is arranged at the water inlet 13 in the pipe well and is connected to the pipe well.

[0058] Further, such as Figure 3and Figure 5 As shown, in a specific embodiment of a groundwater over-exploitation early warning system provided by the present invention, the filter assembly includes a filter cartridge 71 and a filter screen 72. A receiving groove is provided in the cylinder wall of the filter cartridge 71, and a plurality of water holes passing through the receiving groove and the filter cartridge 71 are provided. The filter screen 72 is provided in the receiving groove.

[0059] Specifically, such as Figure 5 and Figure 6 As shown, in a specific embodiment of a groundwater over-exploitation early warning system provided by the present invention, the filter assembly further includes a retaining ring 73, a support plate 74, a receiving ring 75, a connecting plate 76, a flexible sleeve 77 and a drive assembly 78, there are two filter screens 72, and each filter screen 72 is connected end to end; there are two support plates 74, and the two support plates 74 are respectively symmetrically arranged at the bottom of the receiving tank about the axis of the filter cartridge 71 and connected to the filter cartridge 71, the retaining ring 73 is horizontally arranged and connected to the support plate 74; there are two connecting plates 76, and the two connecting plates 76 are connected end to end. The connecting plates 76 are symmetrically arranged at the upper end of the pipe well about the center of the pipe well axis, the receiving ring 75 is horizontally arranged and connected to the connecting plate 76, and the flexible sleeve 77 is sleeved on the receiving ring 75; the two filter screens 72 are respectively arranged on both sides of the two support plates 74, one end is sleeved on the retaining ring 73, and the other end is sleeved on the receiving ring 75; the driving assembly 78 is connected to the connecting plate 76, and the power output end is connected to the flexible sleeve 77 to drive the flexible sleeve 77 to rotate on the receiving ring 75, thereby driving the filter screen 72 to move on the retaining ring 73 and the receiving ring 75.

[0060] Specifically, the drive assembly 78 is a dual-axis motor with a speed change mechanism, the receiving ring 75 is composed of two half rings, one end of the two half rings is connected to the connecting plate 76, and the other end is arranged at intervals; the flexible sleeve 77 is composed of two half sleeves, the two half sleeves are respectively mounted on the two half rings, and one end is connected to the two rotating shafts of the motor, one end of the two filter screens 72 is respectively mounted on the two half sleeves, and the other end is mounted on the retaining ring 73.

[0061] It should be noted that after being used for a period of time, the filter screen 72 will gradually become clogged, resulting in a decrease in water flow capacity. At this time, the filter screen 72 needs to be replaced. The filter screen in the existing pipe well is difficult to replace or the replacement steps are cumbersome. The filter component in the groundwater over-exploitation warning system provided by this embodiment can control the motor to rotate regularly through the control component 40 to drive the filter screen to rotate between the receiving ring 75 and the retaining ring 73, thereby placing different parts of the filter screen 72 in the receiving tank to play a filtering role, and replacing the filter screen 72 in the receiving tank to maintain good water flow.

[0062] like Figure 1 and Figure 2As shown, in a specific embodiment of a groundwater over-exploitation early warning system provided by the present invention, the warning component 50 includes a buzzer, and the buzzer is electrically connected to the control component 40.

[0063] Based on the same inventive concept, an embodiment of the present invention further provides a groundwater level monitoring method, which applies the above-mentioned groundwater over-exploitation early warning system and includes the following steps:

[0064] A. Set up tube wells at pre-set locations;

[0065] B. Use the water level detection device to detect the water level in the pipe well, record it as a1, and store it in the control component 40;

[0066] C. Cover the manhole cover 20 to seal the manhole. The gas pressure sensor 30 detects the pressure change in the manhole. The control component 40 calculates the water level change and sums it with a1 to obtain the real-time water level in the manhole.

[0067] D. At preset time intervals, the gas compensation component compensates for the changes in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well.

[0068] In a specific embodiment of the groundwater level monitoring method provided by the present invention, step D specifically includes the following steps:

[0069] D1. Analyze the changes in the gas composition in the pipe well by the gas analyzer 61, and then calculate the change in the gas in the pipe well by the control component 40;

[0070] D2. Control the air pump 62 and the flow valve 63 through the control component 40 to fill air into the pipe well or extract air from the pipe well to keep the total amount of gas in the pipe well constant.

[0071] It should be noted that the gas analysis calculates the change in the gas in the pipe well by analyzing the percentage change of an inert gas in the total gas in the pipe well.

[0072] Specifically, taking helium as an example, the specific steps of gas compensation are:

[0073] In the first step, the percentage of helium in the gas in the pipe well is analyzed by the gas analyzer 61 and recorded as b1;

[0074] In the second step, after a preset time interval, the percentage of helium in the gas in the pipe well is analyzed again by the gas analyzer 61 and compared with b1. If the percentage increases, it means that the total amount of gas in the pipe well has decreased. The control component 40 processes the percentage to determine the amount of gas reduction in the pipe well, and then controls the air pump 62 and the flow valve 63 to inject an equal amount of gas into the pipe well. If the percentage decreases, it means that the total amount of gas in the pipe well has increased. The control component 40 processes the percentage to determine the amount of gas increase in the pipe well, and then controls the air pump 62 and the flow valve 63 to extract an equal amount of gas from the pipe well.

[0075] In the third step, the gas analyzer 61 is used again to analyze the percentage of helium in the gas in the pipe well, and the previous value of b1 is overwritten.

[0076] Repeating the second and third steps above can continuously compensate for the gas in the pipe well.

[0077] The preset time is the time set according to actual needs.

[0078] The beneficial effects of the groundwater level monitoring method provided by the embodiment of the present invention are as follows: compared with the existing technology, the groundwater level monitoring method provided by the embodiment of the present invention can monitor the groundwater level when the pipe well is closed, which can effectively prevent external pollutants from directly entering the groundwater, thereby protecting the groundwater from being polluted, and during the flood season, groundwater cannot emerge from the wellhead; at the same time, through the gas compensation component, it is used to compensate for the changes in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well, which can effectively improve the accuracy of the measured groundwater level.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A groundwater over-exploitation early warning system, characterized in that: include: A pipe well, with a water inlet (13) at the lower end and a wellhead at the upper end, wherein the water inlet (13) is always below the groundwater level; A manhole cover (20) is provided on the wellhead of the pipe well and is sealed to the pipe well; A gas pressure sensor (30) is provided in the pipe well and connected to the pipe well or the well cover (20); a control component (40) in communication with the gas pressure sensor (30) for receiving gas pressure information in the pipe well transmitted by the gas pressure sensor (30) and processing and obtaining groundwater level information at the location of the pipe well; an alarm component (50) connected to the control component (40) for issuing an alarm when the groundwater level information at the location of the tube well obtained by the control component (40) is lower than a warning value; and A gas compensation component is communicated with the pipe well and electrically connected to the control component (40) for compensating for changes in the total amount of gas in the pipe well caused by the respiration of microorganisms in the pipe well.

2. The groundwater over-exploitation early warning system according to claim 1, characterized in that: The gas compensation component comprises a gas analyzer (61), an air pump (62) and a flow valve (63); the gas analyzer (61) is connected to the pipe well for analyzing the gas composition in the pipe well; the air pump (62) is connected and communicated with the flow valve (63); and the flow valve (63) is connected and communicated with the pipe well.

3. The groundwater over-exploitation early warning system according to claim 2, characterized in that: The pipe well comprises a bottom pipe (11) and a plurality of extension pipes (12); the water inlet (13) is provided at the lower portion of the bottom pipe (11); and the plurality of extension pipes (12) are sequentially stacked on the upper side of the bottom pipe (11).

4. The groundwater over-exploitation early warning system according to claim 3, characterized in that: The bottom of the bottom pipe (11) is closed, and is divided into a water inlet section and a connecting section from bottom to top. A plurality of water inlets (13) are provided on the pipe wall of the water inlet section, and a first grouting groove (14) is provided on the pipe wall of the connecting section along the axial direction. The first grouting groove (14) is communicated with the top of the bottom pipe (11); the extension pipe (12) includes an inner pipe, an outer pipe and a plurality of connecting ribs (16). The inner pipe and the outer pipe are spaced apart to form a second grouting groove (15). The plurality of connecting ribs (16) are all provided between the inner pipe and the outer pipe, and each connecting rib (16) is connected to the outer pipe and the inner pipe respectively. The second grouting groove (15) is communicated with the first grouting groove (14).

5. The groundwater over-exploitation early warning system according to claim 2, characterized in that: It also includes a filter assembly, which is arranged at the water inlet (13) in the pipe well and connected to the pipe well.

6. The groundwater over-exploitation early warning system according to claim 5, characterized in that: The filter assembly comprises a filter cartridge (71) and a filter screen (72); a receiving groove is provided in the wall of the filter cartridge (71), and a plurality of water holes are provided that pass through the receiving groove and the filter cartridge (71); and the filter screen (72) is provided in the receiving groove.

7. The groundwater over-exploitation early warning system according to claim 6, characterized in that: The filter assembly further comprises a retaining ring (73), a support plate (74), a receiving ring (75), a connecting plate (76), a flexible sleeve (77) and a driving assembly (78). There are two filter screens (72), and each filter screen (72) is connected end to end; there are two support plates (74), and the two support plates (74) are respectively symmetrically arranged at the bottom of the receiving groove about the axis of the filter cylinder (71) and connected to the filter cylinder (71); the retaining ring (73) is horizontally arranged and connected to the support plate (74); there are two connecting plates (76), and the two connecting plates (76) are respectively symmetrically arranged at the bottom of the receiving groove about the axis of the pipe well. At the upper end of the pipe well, the receiving ring (75) is horizontally arranged and connected to the connecting plate (76), and the flexible sleeve (77) is sleeved on the receiving ring (75); the two filter screens (72) are respectively arranged on both sides of the two support plates (74), one end of which is sleeved on the retaining ring (73) and the other end of which is sleeved on the receiving ring (75); the driving component (78) is connected to the connecting plate (76), and the power output end is connected to the flexible sleeve (77) to drive the flexible sleeve (77) to rotate on the receiving ring (75), thereby driving the filter screen (72) to move on the retaining ring (73) and the receiving ring (75).

8. The groundwater over-exploitation early warning system according to claim 2, characterized in that: The warning component (50) includes a buzzer, and the buzzer is electrically connected to the control component (40).

9. A method for monitoring groundwater level, characterized in that: The groundwater overdraft early warning system according to any one of claims 2 to 8 is applied, and includes the following steps: A. Setting the tube well at a preset position; B. Using a water level detection device to detect the water level in the pipe well, record it as a1, and store it in the control component (40); C. Covering the well cover (20) to seal the pipe well, detecting the pressure change in the pipe well by means of a gas pressure sensor (30), calculating the water level change by means of a control component (40), and summing the result with a1 to obtain the real-time water level in the pipe well; D. At preset time intervals, the gas compensation component compensates for changes in the total amount of gas in the tube well caused by the respiration of microorganisms in the tube well.

10. The groundwater level monitoring method according to claim 9, characterized in that: Step D specifically includes the following steps: D1. Analyzing the changes in the gas composition in the pipe well by a gas analyzer (61), and then calculating the amount of change in the gas in the pipe well by the control component (40); D2. Control the air pump (62) and the flow valve (63) through the control component (40) to fill air into the pipe well or extract air from the pipe well so that the total amount of gas in the pipe well remains constant.

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