CN111707714A - Soil organic chloride pollution rapid investigation device and method based on complex resistivity - Google Patents
Soil organic chloride pollution rapid investigation device and method based on complex resistivity Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 65
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011835 investigation Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 8
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- 230000010287 polarization Effects 0.000 claims description 24
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Abstract
The invention provides a soil organic chloride pollution rapid investigation device and method based on complex resistivity, which comprises the following steps: the system comprises a ground dragging vehicle, a complex resistivity signal transmitting and data acquisition control device, a complex resistivity signal transmitting device, a complex resistivity signal measuring device, a transmitting electrode, a non-polarized measuring electrode and a wireless data transmission antenna; the ground dragging vehicle drags a complex resistivity signal transmitting and data collecting control device; the method comprises the following steps of completing soil complex resistivity data acquisition of an area to be investigated through a complex resistivity signal transmitting device, a transmitting electrode, a non-polarized measuring electrode and a complex resistivity signal measuring device; the data are transmitted to a data processing center in real time through a wireless data transmission antenna, and investigation and evaluation on organic chloride pollution of soil in a region to be investigated are rapidly and remotely completed; the beneficial effects provided by the invention are as follows: the method realizes automatic and rapid acquisition and processing of field soil complex resistivity data, and provides an important technical means for rapidly determining the pollution range and degree of soil organic chloride.
Description
Technical Field
The invention relates to the technical field of geophysical exploration, in particular to a device and a method for quickly investigating soil organic chloride pollution based on complex resistivity.
Background
The organic chloride includes chlorinated aliphatic hydrocarbon, chlorinated aromatic hydrocarbon and their derivatives and other chlorinated organic compounds. The chlorinated unsaturated aliphatic hydrocarbon is a general name of organic compounds having a chain structure obtained by replacing a hydrogen atom in an unsaturated aliphatic hydrocarbon with chlorine, and is insoluble in water and soluble in solvents such as ethanol and diethyl ether. The organic chloride has anesthetic effect. More recently, chloroolefins, represented by vinyl chloride, have been found to be tumor-inducing. The more the chlorine atoms, the stronger the toxicity, for example, trichloroethylene and tetrachloroethylene have stronger toxic action on kidney, nervous system, skin mucosa, liver, etc. than vinyl chloride.
The organic chloride has stable chemical property, is easy to accumulate in organisms, soil and organic matters of sediments, is slowly degraded in nature, and has long environmental hazard period. Many organic chlorides are thought to have a "carcinogenic, teratogenic, mutagenic" triproducive effect. The nation sets strict discharge standards for chloroform, carbon tetrachloride, chlorobenzene, o-dichlorobenzene, p-dichlorobenzene, chlorophenol and the like.
Complex resistivity is the apparent resistivity with a real and imaginary component. The complex resistivity and the resistivity are parameters for representing the rock electrical characteristics, the complex resistivity is usually used for representing the rock frequency dispersion characteristic and is only complex, and a real part and an imaginary part jointly represent the rock electrical characteristics; the resistivity is relatively simple and is the complex resistivity value measured at zero frequency. The impedance and resistivity under alternating current differ by a sine-cosine function.
Data obtained by the conventional induced polarization method (IP) actually contains information on dc resistivity. However, if the amount of electrical information required to be obtained is maximized, it is necessary to measure both real and imaginary components of the resistivity over additional ac frequency bands. This measurement method is called complex resistivity method and requires comparison of the amplitude and phase of the output and input waveforms, with intermediate transformations, both in frequency and time domain. This allows the study of the entire linear electrical system. Therefore, the Complex Resistivity (CR) method is a variable frequency grounding electrical method, which studies the electrical property of the earth by analyzing the real and imaginary components of the total resistivity of the earth. Because this method can derive different parameters of induced polarization, resistivity and electrical and electromagnetic properties of the earth, distinguish their respective effects, and display the results for observation and analysis.
The results of a large number of laboratory soil sample complex resistivity measurements show that the soil samples containing organic chloride (DNAPL or LNAPL) have obvious induced polarization anomalies, while the soil samples not contaminated by organic chloride have almost no induced polarization anomalies. The industry has investigated the distribution of sources of organic chloride contamination in soil using complex resistivity methods at the surface and shallow wells. However, the existing ground complex resistivity measuring method still adopts a symmetrical quadrupole or dipole-dipole operation mode of conventional ground electrical prospecting, and manually moves a complex resistivity transmitting and measuring electrode, a complex resistivity measuring instrument and a cable between a connecting instrument and the electrode point by point along a measuring line, collects complex resistivity data point by point along the measuring line, and starts to process, form and comprehensively explain the complex resistivity data measured by each measuring point after the collection is finished. The construction mode has low operation speed, low efficiency and high cost, is not beneficial to quickly investigating the distribution condition of organic chloride pollution in soil in a large area, and can not be constructed in paddy fields and swamp zones because the measurement construction site is manually operated, thereby seriously restricting the wide popularization and application of investigating the soil pollution condition by using the complex resistivity measurement method.
Disclosure of Invention
In view of the above, the invention provides a soil organic chloride pollution rapid investigation device and method based on complex resistivity, the device comprises the following components:
the system comprises a ground dragging vehicle, a complex resistivity signal transmitting and data acquisition control device, a complex resistivity signal transmitting device, a complex resistivity signal measuring device, a transmitting electrode, a non-polarized measuring electrode and a wireless data transmission antenna;
the ground dragging vehicle is connected with the complex resistivity signal transmitting and data collecting control device through a dragging rope; the complex resistivity signal transmitting device and the complex resistivity signal measuring device are fixedly arranged in the complex resistivity signal transmitting and data acquisition control device;
the wireless data transmission antenna is fixedly arranged on the top of the complex resistivity signal transmitting and data acquiring control device;
the complex resistivity signal transmitting device, the complex resistivity signal measuring device and the wireless data transmission antenna are electrically connected with the complex resistivity signal transmitting and data acquisition control device;
the complex resistivity signal transmitting device is electrically connected with the transmitting electrode; the complex resistivity signal measuring device is electrically connected with the non-polarized measuring electrode;
the transmitting electrode and the non-polarized measuring electrode are both in direct contact with soil of an area to be investigated;
the ground dragging vehicle drags the complex resistivity signal transmitting and data collecting control device, the complex resistivity signal transmitting device, the complex resistivity signal measuring device and the wireless data transmission antenna to an area to be investigated;
the complex resistivity signal transmitting and data acquisition control device controls the complex resistivity signal transmitting device to transmit a frequency sweeping excitation current signal from low frequency to high frequency to soil of an area to be investigated through a transmitting electrode;
the non-polarized measuring electrodes respond to the transmitting signals and measure the difference of the response voltages between the two non-polarized measuring electrodes;
the complex resistivity signal measuring device measures amplitude and phase signals of the response voltage difference to serve as response signals of soil in the area to be investigated;
the complex resistivity signal transmitting and data acquiring control device uploads a transmitting current signal and a response signal of the soil of the area to be investigated to a user or a data processing center through the wireless transmission antenna;
and the user or the data processing center performs analysis processing according to the measured voltage difference amplitude and the measured phase signal to finish the rapid investigation of the organic chloride pollution of the soil in the investigation region.
Furthermore, the complex resistivity signal transmitting device is electrically connected with the two grounding wheel type transmitting electrodes on the outer side of the complex resistivity signal transmitting and data collecting control device through an armored transmitting coaxial cable.
Furthermore, the complex resistivity signal measuring device is electrically connected with the two grounding wheel type non-polarized measuring electrodes on the inner side of the complex resistivity signal transmitting and data collecting control device through an armored measuring coaxial cable.
Further, the distance between the two grounded wheel type transmitting electrodes is [ a, b ] m; the distance between the two grounding wheel type non-polarization measuring electrodes is [ c, d ] m; a, b, c and d are preset values according to actual conditions; the two grounded wheel type transmitting electrodes and the two grounded wheel type non-polarized measuring electrodes are both in central symmetry distribution by taking the central line of the complex resistivity signal transmitting and data collecting control device as a central axis.
Furthermore, the two grounded wheel-type unpolarized measuring electrodes are solid unpolarized measuring electrodes prepared by adopting a nano ceramic process, and the base material of the two grounded wheel-type unpolarized measuring electrodes is carbon fiber.
Further, the specific communication mode of the wireless data transmission antenna is 5G wireless network communication.
A soil organic chloride pollution rapid investigation method based on complex resistivity comprises the following steps:
s101: connecting the complex resistivity signal transmitting and data acquiring control device with the ground dragging vehicle through a dragging rope in an area to be surveyed;
s102: the ground dragging vehicle slowly drags the complex resistivity signal transmitting and data collecting control device to move ahead on the ground of the soil to be investigated according to a set measuring route;
s103: the complex resistivity signal transmitting device supplies power to two outward grounding wheel type transmitting electrodes through an armored transmitting coaxial cable; the power supply current signal directly supplies power to the underground through the contact of the two grounding wheel type transmitting electrodes and the ground; the power supply current signal is a sweep frequency excitation current signal from low frequency to high frequency, and the signal frequency range is from m to n Hz; the transmitted frequency points are increased in number in a logarithmic mode, and each measuring point is at least not less than k frequency points in the signal frequency range; wherein m, n and k are preset values according to the performance parameters of the complex resistivity signal transmitting device;
s104: the complex resistivity signal measuring device measures voltage difference amplitude and phase signals generated at two ends of two grounding wheel type non-polarization measuring electrodes connected with an armored measuring coaxial cable, and the frequency point number recorded by each measuring point is the same as the frequency point number of the sweep frequency current signal;
s105: the complex resistivity signal transmitting and data acquiring control device uploads the transmitted sweep frequency excitation current data and synchronously acquired voltage difference amplitude and phase data to a user or a data processing center through a 5G network through the wireless transmission antenna;
s106: and a user or a data processing center downloads sweep frequency current data transmitted to the underground in an investigation site and synchronously acquired voltage difference amplitude and phase data in real time, and explains the sweep frequency current data and the synchronously acquired voltage difference amplitude and phase data to finish the rapid investigation of the soil organic chloride pollution distribution characteristics of the area to be investigated.
Further, in step S106, the sweep frequency excitation current data emitted to the underground in the survey field and the synchronously acquired voltage difference amplitude and phase data are interpreted, and the specific process is as follows:
s201: according to the coefficient K of the symmetrical quadrupole device of the complex resistivity signal transmitting and data acquisition control device, the complex resistivity calculation of the sweep frequency current data and the synchronously acquired voltage difference amplitude and phase data corresponding to each measuring point is completed by using the formula (1); the symmetrical quadrupole device is characterized in that 4 electrodes which are arranged in central symmetry comprise the 2 transmitting electrodes and the 2 non-polarized measuring electrodes; the formula (1) is specifically as follows:
in the formula (1), o (i omega) is complex resistivity, i is an imaginary part, and omega is angular frequency; u is the voltage difference amplitude; i is the excitation current amplitude;
s202: fitting the actually measured complex resistivity spectrum data by using two Cole-Cole models, and obtaining the induced polarization rate of each measuring point by inverting the complex resistivity spectrum;
s203: respectively drawing a complex resistivity plane contour map and an induced polarization plane contour map according to the complex resistivity of each measuring point obtained by the calculation in the step S201 and the induced polarization of each measuring point obtained in the step S202;
s204: analyzing a complex resistivity plane contour map and an induced polarizability plane contour map, delineating a high-value abnormal area on the resistivity plane contour map and the induced polarizability plane contour map, and simultaneously collecting a soil sample in the delineated high-value abnormal area to analyze and test the content of organic chloride;
s205: and completing the rapid investigation and evaluation of the soil organic chloride pollution area based on the complex resistivity according to the complex resistivity of each measuring point, the induced polarization rate of each measuring point and the test result of the organic chloride content of the soil sample.
The beneficial effects provided by the invention are as follows: the method realizes automatic and rapid acquisition and processing of field soil complex resistivity data, and provides an important technical means for rapidly determining the range and degree of soil organic chloride pollution.
Drawings
FIG. 1 is a schematic structural diagram of a soil organic chloride pollution rapid investigation device based on complex resistivity according to the present invention;
FIG. 2 is a structural side view of the soil organic chloride pollution rapid investigation device based on complex resistivity of the invention;
FIG. 3 is a top view of the structure of the device for rapidly investigating organic chloride pollution in soil based on complex resistivity according to the present invention;
FIG. 4 is a flow chart of the soil organic chloride pollution rapid investigation method based on complex resistivity.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a device for rapidly investigating soil organic chloride pollution based on complex resistivity, comprising the following components:
the system comprises a ground dragging vehicle 1, a complex resistivity signal transmitting and data acquiring control device 2, a complex resistivity signal transmitting device 3, a complex resistivity signal measuring device 4, a transmitting electrode 7, a non-polarized measuring electrode 8 and a wireless data transmission antenna 9;
the ground dragging vehicle 1 is connected with the complex resistivity signal transmitting and data acquiring control device 2 through a dragging rope; the complex resistivity signal transmitting device 3 and the complex resistivity signal measuring device 4 are fixedly arranged in the complex resistivity signal transmitting and data acquiring control device 2;
the wireless data transmission antenna 9 is fixedly arranged at the top of the complex resistivity signal transmitting and data acquiring control device 2;
the complex resistivity signal transmitting device 3, the complex resistivity signal measuring device 4 and the wireless data transmission antenna 9 are electrically connected with the complex resistivity signal transmitting and data acquiring control device 2;
the complex resistivity signal transmitting device 3 is electrically connected with the transmitting electrode 7; the complex resistivity signal measuring device 4 is electrically connected with the non-polarized measuring electrode 8;
the transmitting electrode 7 and the non-polarized measuring electrode 8 are both in direct contact with the soil of the area to be investigated;
the ground dragging vehicle 1 drags the complex resistivity signal transmitting and data acquiring control device 2, the complex resistivity signal transmitting device 3, the complex resistivity signal measuring device 4 and the wireless data transmission antenna 9 to an area to be investigated;
the complex resistivity signal transmitting and data acquiring control device 2 controls the complex resistivity signal transmitting device 3 to transmit a sweep frequency excitation current signal from low frequency to high frequency to soil of an area to be investigated through a transmitting electrode 7;
the non-polarized measuring electrodes 8 respond to the transmitted signal and measure the voltage difference between the two non-polarized measuring electrodes 8;
the complex resistivity signal measuring device 4 measures amplitude and phase signals of the response voltage difference to serve as response signals of soil in the area to be investigated;
the complex resistivity signal transmitting and data acquiring control device 2 uploads a transmitting signal and a response signal of the soil of the area to be investigated to a user or a data processing center through the wireless transmission antenna 9;
and the user or the data processing center performs analysis processing according to the measured voltage difference amplitude and the measured phase signal to finish the rapid investigation of the soil organic chloride pollution.
The complex resistivity signal transmitting device 3 is an impedance analyzer (Solartron 1260 impedance analyzer) which supplies power to two grounding wheel type transmitting electrodes 7 at the outer side through an armored coaxial cable, the supplied frequency sweep current signals from low frequency to high frequency are provided, the signal frequency range is from 0.01Hz to 1000Hz, the transmitted frequency points are increased in number in a logarithmic mode, and each measuring point is at least not less than 64 frequency points in the signal frequency range;
the complex resistivity signal measuring device 4 is an impedance analyzer (Solartron 1260 impedance analyzer) which is an armored coaxial cable connected with two grounding wheel type unpolarized measuring electrodes 8 on the inner side, and is used for synchronously measuring the voltage difference amplitude and the phase signal generated by the sweep frequency current signal from low frequency to high frequency at two ends of the unpolarized measuring electrodes 8, which is transmitted to the ground by a complex resistivity signal transmitting device through a transmitting electrode, wherein the signal frequency range is from 0.01Hz to 1000Hz, and the frequency point number recorded by each measuring point is the same as the frequency point number of the sweep frequency current signal;
the two grounding wheel type non-polarization measuring electrodes 8 on the inner side connected with the complex resistivity signal measuring device 4 are solid non-polarization measuring electrodes prepared by adopting an advanced nano ceramic process, and the solid non-polarization measuring electrodes take carbon fibers as base materials and are processed by a series of physical and chemical methods to obtain a solid non-polarization measuring electric field sensor with high mechanical strength, large specific surface area, low noise and high sensitivity;
in this example, the unpolarized electrode was JM-D and the size was
The performance parameters were as follows:
typical range is as follows: < 100 μ V
Range drift: < 20 μ V/day
Self-noise: < 1nV/√ g (Hz) @1Hz
Internal resistance: < 5 Ω @100Hz
The external dimension is as follows: height 210mm, maximum outer diameter 44mm (the shape and size can be changed according to requirements, without affecting the performance)
Bandwidth: DC-1kHz
Pressure resistance: under the pressure of 40MPa, the performance is stable
The space between two grounding wheel type transmitting electrodes 7 on the outer side connected with the complex resistivity signal transmitting device 3 is about 5 meters to 10 meters, and the space between two grounding wheel type non-polarization measuring electrodes 8 on the inner side connected with the complex resistivity signal measuring device 4 is about 2 meters to 6 meters;
the top of the complex resistivity signal transmitting and data acquiring control device is provided with a 5G wireless signal transmitting antenna, sweep frequency excitation current data transmitted to the underground and acquired voltage difference amplitude and phase data are uploaded to a 5G wireless network through the 5G wireless signal transmitting antenna in real time, and a user or a data processing person downloads complex resistivity data acquired on a construction site in real time through the 5G wireless network to a computer of a processing center for processing, abnormal display and comprehensive interpretation;
referring to fig. 4, a method for rapidly investigating organic chloride pollution of soil based on complex resistivity includes the following steps:
s101: connecting the complex resistivity signal transmitting and data acquiring control device 2 with the ground dragging vehicle 1 through a dragging rope in an area to be surveyed;
according to the ground condition and condition in the area to be investigated, the ground towing vehicle 1 can be an off-road vehicle or a pick-up truck or a wheeled tractor or a caterpillar tractor or a sand cross-country motorcycle or a desert working vehicle or a marsh carrier vehicle or a carrier ship, and the working area can be a plain or a small-sized hilly land or a farmland or a grassland or a sand or a desert or a marsh;
s102: the ground dragging vehicle 1 slowly drags the complex resistivity signal transmitting and data acquisition control device 2 to move ahead on the ground of the soil to be investigated according to a set route
S103: the complex resistivity signal transmitting device 3 is an impedance analyzer (Solartron 1260 impedance analyzer) which supplies power to two grounding wheel type transmitting electrodes 7 at the outer side through an armored coaxial cable, the supplied frequency sweep current signals from low frequency to high frequency are provided, the signal frequency range is from 0.01Hz to 1000Hz, the transmitted frequency points are increased in number in a logarithmic mode, and each measuring point is at least not less than 64 frequency points in the signal frequency range;
s104: the complex resistivity signal measuring device 4 measures voltage difference amplitude and phase signals generated at two ends of two grounding wheel type non-polarization measuring electrodes 8 connected with an armored measuring coaxial cable 6, and the frequency point number recorded by each measuring point is the same as the frequency point number of the sweep frequency current signal;
s105: the complex resistivity signal transmitting and data acquiring control device 2 uploads the transmitted sweep frequency excitation current data and synchronously acquired voltage difference amplitude and phase data to a user or a data processing center through the wireless transmission antenna 9;
s106: and a user or a data processing center downloads sweep frequency excitation current data transmitted to the underground in an investigation site and synchronously acquired voltage difference amplitude and phase data in real time, and explains the sweep frequency excitation current data and the synchronously acquired voltage difference amplitude and phase data to finish the rapid investigation of the organic chloride pollution of the soil to be investigated.
Step S106 specifically includes:
s201: according to the device coefficient K of the symmetrical quadrupole device of the complex resistivity signal transmitting and data acquisition control device 2, carrying out complex resistivity calculation on each measuring point by using a formula (1) to download and store sweep frequency current data transmitted to the underground by each measuring point and synchronously acquired voltage difference amplitude and phase data;
in the formula (1), o (i omega) is complex resistivity, i is an imaginary part, and omega is angular frequency; u is the voltage difference amplitude; i is the current amplitude;
s202: the resistivity caused by the induced polarization effect (IP) is a complex function (complex resistivity o (i ω)) of frequency f or angular frequency ω 2 pi f, and the spectrum of the complex resistivity caused by the induced polarization effect satisfies the Cole-Cole model:
in the formula, o-resistivity (excluding IP),
zero frequency resistivity (including IP), m-charging rate (polarizability), τ -time constant (in s), c-frequency correlation coefficient;
fitting the actually measured apparent complex resistivity spectrum data by using two Cole-Cole models, and obtaining the parameters of the laser television spectrum by inverting the apparent complex resistivity spectrum: zero video resistivity os0Charge rate m of exciting televisionsexcitation polarizability etasView time constant τ;
s203, calculating the complex resistivity o (i omega) of each measuring point according to the step S201 and the induced polarization η of each measuring point obtained in the step S202sRespectively drawing a complex resistivity plane contour map and an induced polarizability plane contour map;
s204: analyzing a complex resistivity plane contour map and an induced polarizability plane contour map, delineating a high-value abnormal area on the resistivity plane contour map and the induced polarizability plane contour map, and simultaneously collecting a soil sample in the delineated high-value abnormal area to analyze and test the content of organic chloride;
s205: and completing the rapid investigation and evaluation of the soil organic chloride pollution area based on the complex resistivity according to the complex resistivity of each measuring point, the induced polarization rate of each measuring point and the test result of the organic chloride content of the soil sample.
The beneficial effects of the implementation of the invention are as follows: the method realizes automatic and rapid acquisition and processing of field soil complex resistivity data, and provides an important technical means for rapidly determining the range and degree of the soil polluted by the organic chloride.
The features of the above-described embodiments and embodiments of the invention may be combined with each other without conflict.
The directional terms upper, lower, left, right, side, top, surface and the like in the present invention are used for descriptive purposes only and are not intended to be limiting with respect to the claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A soil organic chloride pollutes quick investigation device based on complex resistivity which characterized in that: the method specifically comprises the following steps: the system comprises a ground dragging vehicle (1), a complex resistivity signal transmitting and data collecting control device (2), a complex resistivity signal transmitting device (3), a complex resistivity signal measuring device (4), a transmitting electrode (7), a non-polarized measuring electrode (8) and a wireless data transmission antenna (9);
the ground dragging vehicle (1) is connected with the complex resistivity signal transmitting and data collecting control device (2) through a dragging rope; the complex resistivity signal transmitting device (3) and the complex resistivity signal measuring device (4) are fixedly arranged in the complex resistivity signal transmitting and data acquiring control device (2);
the wireless data transmission antenna (9) is fixedly arranged at the top of the complex resistivity signal transmitting and data acquiring control device (2);
the complex resistivity signal transmitting device (3), the complex resistivity signal measuring device (4) and the wireless data transmission antenna (9) are electrically connected with the complex resistivity signal transmitting and data acquiring control device (2);
the complex resistivity signal transmitting device (3) is electrically connected with the transmitting electrode (7); the complex resistivity signal measuring device (4) is electrically connected with the non-polarized measuring electrode (8);
the transmitting electrode (7) and the non-polarized measuring electrode (8) are both in direct contact with the soil of the area to be investigated;
the ground dragging vehicle (1) drags the complex resistivity signal transmitting and data collecting control device (2), the complex resistivity signal transmitting device (3), the complex resistivity signal measuring device (4) and the wireless data transmission antenna (9) to an area to be investigated;
the complex resistivity signal transmitting and data acquiring control device (2) controls the complex resistivity signal transmitting device (3) to transmit a sweep frequency excitation current signal from low frequency to high frequency to soil to be investigated through a transmitting electrode (7);
the non-polarized measuring electrodes (8) are responsive to the transmitted signal, measuring the difference in response voltage between the two non-polarized measuring electrodes;
the complex resistivity signal measuring device (4) measures amplitude and phase signals of the response voltage difference to serve as response signals of soil in the area to be investigated;
the complex resistivity signal transmitting and data acquiring control device (2) uploads a transmitting current signal of a transmitting electrode (7) and a response signal of the soil of the area to be investigated to a user or a data processing center through the wireless transmission antenna (9);
and the user or the data processing center performs analysis processing according to the measured voltage difference amplitude and the measured phase signal to finish the rapid investigation of the soil organic chloride pollution.
2. The device for rapidly investigating soil organic chloride pollution based on complex resistivity as claimed in claim 1, wherein: the complex resistivity signal transmitting device (3) is electrically connected with two grounding wheel type transmitting electrodes (7) on the outer side of the complex resistivity signal transmitting and data collecting control device (2) through an armored transmitting coaxial cable (5).
3. The device for rapidly investigating soil organic chloride pollution based on complex resistivity as claimed in claim 1, wherein: the complex resistivity signal measuring device (4) is electrically connected with two grounding wheel type non-polarized measuring electrodes (8) on the inner side of the complex resistivity signal transmitting and data collecting control device (2) through an armored measuring coaxial cable (6).
4. The device for rapidly investigating soil organic chloride pollution based on complex resistivity as claimed in claim 1, wherein: the distance between the two grounded wheel type emitting electrodes (7) is [ a, b ] m; the distance between the two grounding wheel type non-polarized measuring electrodes (8) is [ c, d ] m; a, b, c and d are preset values according to actual conditions; the two grounding wheel type transmitting electrodes (7) and the two grounding wheel type non-polarized measuring electrodes (8) are both in central symmetry distribution by taking the central line of the complex resistivity signal transmitting and data collecting control device (2) as a central axis.
5. The device for rapidly investigating soil organic chloride pollution based on complex resistivity as claimed in claim 1, wherein: the two grounded wheel type unpolarized measuring electrodes (8) are solid unpolarized measuring electrodes prepared by adopting a nano ceramic process, and the base material of the two grounded wheel type unpolarized measuring electrodes is carbon fiber.
6. The device for rapidly investigating soil organic chloride pollution based on complex resistivity as claimed in claim 1, wherein: the specific communication mode of the wireless data transmission antenna (9) is 5G wireless network communication.
7. A soil organic chloride pollution rapid investigation method based on complex resistivity, which is applied to any one of the soil organic chloride pollution rapid investigation devices based on complex resistivity as claimed in claims 1-6, and is characterized in that: the method specifically comprises the following steps:
s101: connecting the complex resistivity signal transmitting and data collecting control device (2) with the ground dragging vehicle (1) through a dragging rope in an area to be surveyed;
s102: the ground dragging vehicle (1) slowly drags the complex resistivity signal transmitting and data collecting control device (2) to move ahead on the soil ground of the area to be investigated according to a set measuring route;
s103: the complex resistivity signal transmitting device (3) supplies power to two outward grounding wheel type transmitting electrodes (7) through an armored transmitting coaxial cable (5); the power supply current signal directly supplies power to the underground through the contact of the two grounding wheel type transmitting electrodes and the ground; the supplied current signal is a sweep frequency excitation current signal from low frequency to high frequency, and the signal frequency range is from m to nHz; the transmitted frequency points are increased in a logarithmic mode, and each measuring point is not less than k frequency points in a signal frequency range; wherein m, n and k are preset values according to the performance parameters of the complex resistivity signal transmitting device (3);
s104: the complex resistivity signal measuring device (4) measures voltage difference amplitude and phase signals generated at two ends of two grounding wheel type non-polarized measuring electrodes (8) connected with an armored measuring coaxial cable (6), and the frequency point number recorded by each measuring point is the same as the frequency point number of the sweep frequency current signal;
s105: the complex resistivity signal transmitting and data acquiring control device (2) uploads the transmitted sweep frequency excitation current data and synchronously acquired voltage difference amplitude and phase data to a user or a data processing center through a 5G wireless network through the wireless transmission antenna (9);
s106: and a user or a data processing center downloads sweep frequency excitation current data transmitted to the underground in an investigation site and synchronously acquired voltage difference amplitude and phase data in real time, and explains the sweep frequency excitation current data and the synchronously acquired voltage difference amplitude and phase data to finish the rapid investigation of the soil organic chloride pollution distribution characteristics of the area to be investigated.
8. The method for rapidly investigating soil organic chloride pollution based on complex resistivity as claimed in claim 7, wherein: in step S106, the sweep frequency excitation current data transmitted to the underground in the survey field and the synchronously acquired voltage difference amplitude and phase data are interpreted, and the specific process is as follows:
s201: according to the coefficient K of the symmetrical quadrupole device of the complex resistivity signal transmitting and data collecting control device (2), the complex resistivity calculation of the sweep frequency excitation current data and the synchronously collected voltage difference amplitude and phase data corresponding to each measuring point is completed by using the formula (1); the symmetrical quadrupole device is 4 electrodes which are arranged in central symmetry and comprises 2 transmitting electrodes (7) and 2 non-polarized measuring electrodes (8); the formula (1) is specifically as follows:
in the formula (1), o (i omega) is complex resistivity, i is an imaginary part, and omega is angular frequency; u is the voltage difference amplitude; i is the excitation current amplitude;
s202: fitting the actually measured complex resistivity spectrum data by using two Cole-Cole models, and obtaining the induced polarization rate of each measuring point by inverting the complex resistivity spectrum;
s203: respectively drawing a complex resistivity plane contour map and an induced polarization plane contour map according to the complex resistivity of each measuring point obtained by the calculation in the step S201 and the induced polarization of each measuring point obtained in the step S202;
s204: analyzing a complex resistivity plane contour map and an induced polarizability plane contour map, delineating a high-value abnormal area on the complex resistivity plane contour map and the induced polarizability plane contour map, and simultaneously collecting a soil sample in the delineated high-value abnormal area to analyze and test the content of organic chloride;
s205: and completing the rapid investigation and evaluation of the soil organic chloride pollution area based on the complex resistivity according to the complex resistivity of each measuring point, the induced polarization rate of each measuring point and the test result of the organic chloride content of the soil sample.
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