CN102305814B - System and method for monitoring seawater intrusion-ground water level-soil salinization in real time - Google Patents
System and method for monitoring seawater intrusion-ground water level-soil salinization in real time Download PDFInfo
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Abstract
The invention relates to a system and a method for monitoring seawater intrusion-ground water level-soil salinization in real time. The system comprises an upper computer, an acquisition and emission device with a general packet radio service (GPRS) module, and a resistivity measurement device consisting of pluggable nylon modules and copper electrode rings among the pluggable nylon modules, wherein each copper electrode ring is connected with a central control unit in the acquisition and emission device through a wire. The method comprises the following steps of: selecting a sample point in a seaside region; measuring the resistivity of a soil sample at the sample point when seawater is saturated, fresh water is saturated and the salt content is 0.3 percent, and taking the resistivity as an early warning threshold value; and giving an alarm when the bottom part, middle part or upper part of the resistivity measurement device reaches the threshold value. The system is widely applied, is convenient to use and can be combined according to the monitoring aim to reduce cost, dynamic, in-situ and real-time monitoring is realized through remote data transmission, remote, in-situ, real-time and automatic synchronous monitoring is realized by vertically measuring resistivity at certain depth, and the system has great significance for studying the seawater intrusion-ground water level-soil salinization.
Description
Technical field
The present invention relates to the system and method for a kind of Real-Time Monitoring seawater intrusion-underground water table-soil salinization, belong to Natural calamity monitoring early warning field.
Background technology
Seawater intrusion is to contaminate a kind of environmental geology deterioration phenomenon of fresh groundwater layer due to the seawater that fresh groundwater water level decline in land causes.In the seawater intrusion process, salinity accumulates to upper soll layer by capillary force and will cause the soil salinization.More shallow when underground water table ratio, a large amount of moisture evaporations cause salinity to gather in soil, also can cause the salination of soil.The process of the process of seawater intrusion, soil salt marsh often is accompanied by the variation of underground water table.Three's generation and evolution all influence each other, interwoveness.Occur can to cause water quality deterioration after seawater intrusion and the soil salinization, reduce in the irrigation water seedbed, soil ecosystem is unbalance, and cultivated land resource is degenerated, and natural ecological environment worsens, thereby affects industrial and agricultural production and population quality and social stability.
The at present monitoring for seawater intrusion, underground water table, the soil salinization mostly is single purpose monitoring, and namely a kind of method can only be monitored a kind of in above-mentioned three kinds of phenomenons, and can not monitor simultaneously three indexs.The common monitoring method of seawater intrusion has: water chemistry sample collection and lab analysis method, image treating and isotope method and time domain resistivity imaging method, lab analysis method effective poor, limited resource is also many, the shortcoming of image treating and isotope method is that it has polluted seawater, cause secondary pollution, the technical requirement of time domain resistivity imaging method is high, complicated operation.The common monitoring method of underground water table has: monitor well is set utilizes lining rope and ammeter to carry out the personal monitoring or utilize the radar remote sensing data monitoring.Utilize the method efficient of monitor well monitoring underground water table low, error is large, poor in timeliness, and adopts radar remote sensing data monitoring cost high, more is used for the continuous monitoring in area on a large scale.The routine monitoring method of the soil salinization has: comprise remote sensing method and the chromatography of ions.The remote sensing method has the monitoring hysteresis quality, can't carry out Real-Time Monitoring; The chromatography of ions is poor for applicability, is only applicable to Laboratory Monitoring.
Seawater intrusion-underground water table-soil salinization three influences each other, and is closely related, yet for three's also rare research of Simultaneous Monitoring.A kind of system and method that can in-situ synchronization Real-Time Monitoring seawater intrusion-underground water table-soil salinization has great significance for the timely prevention and control disaster of Real-Time Monitoring.
Summary of the invention
The system and method that the purpose of this invention is to provide a kind of Real-Time Monitoring seawater intrusion-underground water table-soil salinization is to overcome the deficiencies in the prior art.
Technical solution of the present invention is by long-range, original position, in real time, automatically measures resistivity value in the soil certain limit, real-time change judgment seawater intrusion according to soil different depth resistivity, whether underground water table and the soil salinization occur, thereby realize three's in-situ synchronization real-time automatic monitoring.Specifically cast the certain pluggable nylon module of specification and copper electrode ring, it is pegged graft forms resistivity test device, and the electrode copper ring of resistivity test device is connected by wire with the collection emitter, forms the collection in worksite emitter.Vertical resistivity in collection in worksite emitter Real-time Collection soil, and transmit a signal to long-range receive and analysis device.Real-time change and generation seawater intrusion according to soil different depth resistivity, the resistivity threshold value of warning of groundwater level fluctuation and the soil salinization, judge by software analysis whether the three occurs, thus in-situ synchronization Real-Time Monitoring seawater intrusion-underground water table-Soil Salinization Process.
The system of a kind of Real-Time Monitoring seawater intrusion-underground water table-soil salinization comprises the host computer with signal receiver, characterized by further comprising the resistivity test device that bottom and top are respectively equipped with conehead and gather emitter; Described resistivity test device comprises the pluggable cylindric nylon module of at least 5 hollows and is clipped in the interior copper electrode ring of adjacent two nylon module abutment joints; Described collection emitter comprises the central control unit that includes control program that is connected with each copper electrode ring by wire, with the GPRS module with emitting antenna that is connected with central control unit.
Above-mentioned resistivity test device is pegged graft with the copper electrode ring in the abutment joint that is clipped in adjacent two nylon modules by the pluggable nylon module of 5～201 hollows and is formed.
Consistent in order to guarantee the spacing between electrode, make the conversion of measuring position and elevation convenient, the thickness of each copper electrode ring is identical, is 0.5～1mm.
For the ease of assembling and be conducive to injection, above-mentioned pluggable nylon module can be nested with on 1 or 2 load axles, and load axle surface can be threaded, and has built vulcanized rubber in tube chamber, and makes nylon module, copper electrode ring and wire become integral body.
The GPRS module is at the 900MHz/1800MHz net environment, and antenna is the GSM antenna.
Described host computer includes the client service program as long-range receive and analysis device.
A kind of method of utilizing above-mentioned monitoring system in-situ synchronization Real-Time Monitoring seawater intrusion-underground water table-soil salinization comprises that (1) choose sampling point in the area by the sea; Characterized by further comprising following steps:
(2) to above-mentioned sampling point soil sampling, measure that this soil sample is saturated at seawater, fresh water is saturated and the resistivity of salt content when being 0.3%, as the monitoring and warning threshold value on resistivity test device bottom, middle part and top;
(3) copper electrode ring and nylon module are mutually pegged graft and consisted of resistivity test device;
(4) at the vertical injection resistivity test device in sampling point place;
(5) by host computer client service programming acquisition parameter, and start real-time automatic monitoring;
(6) by the GPRS module, the resistivity signal is reached host computer in real time;
(7) host computer receives the real-time resistivity signal of original position transmission through signal receiver, the threshold value of warning that the client service program of host computer is default according to resistivity test device bottom, middle part and top, seawater intrusion is occuring, automatic monitoring warning during groundwater level fluctuation and during salination.
In step 1, need to carry out risk to coastal region and reconnoitre assessment, to understand the geologic condition of sampling point, the soil electrical properties of soil types etc., especially sampling point, specification and the number of decision resistivity test device.
in step 2, when seawater intrusion occurs, the sphenoid of degree of saltiness water interface can be followed seawater intrusion and constantly migrate to bottom the water-bearing zone, therefore the resistivity data of just degree of saltiness water interface place's collection of bottom, water-bearing zone has obvious difference, same groundwater level fluctuation place, also exist the interface of fresh water saturated soil and fresh water unsaturated soil resistivity contrasts, it is 0.3% such boundary value that the salination position exists salt content, therefore measure the seawater saturated soil, the fresh water saturated soil, and salt content is the resistivity of 0.3% soil, respectively as resistivity test device bottom judgement seawater intrusion, the standard of middle part judgement underground water table and the top judgement soil salinization.
In step 3, the nylon module is pegged graft, copper electrode ring of every two nylon module abutment joint inner clips, each copper electrode ring is drawn in the pipe that wire forms from the nylon module by being connected with central control unit, can be inserted with 1 or 2 load axle in pipe, then cast vulcanized rubber in managing, resistivity test device formed, at its underpart grafting conehead, pegging graft at an upper portion thereof gathers emitter formation collection in worksite emitter.
The quantity of above-mentioned nylon module, height and inner and outer diameter can be respectively chosen in 5～201,5～100mm, 20～60mm and 30～70mm scope; The nylon module can adopt the method for nylon pouring to make by mould.Above-mentioned copper electrode ring thickness is 0.5mm; External diameter 31～71mm need be slightly larger than the external diameter of nylon module in order to the copper electrode ring is exposed; Internal diameter 27～67mm, thus need can be clipped in two nylon module abutment joints greater than the internal diameter of nylon module.
In step 4, according to the resistivity test device of the vertical injection respective numbers of sampling point situation of investigation in step 1, wherein injection mode is the hydraulic pressure injection.
In step 5, acquisition parameter comprises the reference position that frequency acquisition and copper electrode ring are measured, and according to the geologic condition of sampling point, monitoring and warning position as seawater intrusion, underground water table and the soil salinization is arranged to respectively on bottom, middle part and the top of resistivity test device, after starting real-time automatic monitoring, resistivity test device begins the real-time collection and continual collection soil resistivity.
The setting of monitoring location is to decide according to the geologic condition of sampling point, and the monitoring location of seawater intrusion is arranged on fresh-water aquifer bottom, and underground water table is arranged in the zone, water-bearing zone, and soil salinization monitoring location is arranged on the upper soll layer position.
In step 7, the generating process of host computer dynamic synchronization monitoring seawater intrusion, underground water table, the soil salinization is different according to the position of three's generation and monitoring threshold is different separately.
When beginning that seawater intrusion occurs and invade the bottom, water-bearing zone, the bottom position of resistivity test device is in the scope of degree of saltiness water interface sphenoid migration, therefore be seawater when saturated when this monitoring location arrives its threshold value of warning, at first host computer is emitted in the alarm that occurs seawater intrusion herein.
WATER LEVEL CHANGES generally changes in the scope of water-bearing zone, the soil bottom at underground water table place is the fresh water saturated soil, top is unsaturated soil, both resistivity there are differences, so when underground fluctuation of water table, can there be a sudden change value in the resistivity data at resistivity test device middle part, this sudden change value can appear at along with the change of underground water table the diverse location at resistivity test device middle part, when resistivity test device middle part has the copper electrode ring threshold value of resistivity value of fresh water saturated soil to occur reaching and during the rate that has a resistance sudden change, host computer is according to the real time position of the degree of depth judgement underground water table of this copper electrode ring.
The soil salinization refers to that salinity gathers at upper soll layer, when the surrounding soil generation salination of resistivity test device top, soil is that salt content surpasses 0.3% soil herein, so when resistivity test device top had the copper electrode ring to monitor resistivity value over its threshold value of warning, host computer sent soil salinization early warning.
Module can be set according to the concrete condition of sampling point in the present invention and copper electrode ring number changes the length of resistivity test device, thereby reduces monitoring cost.By being set, monitoring zero-time, position and monitoring time interval realized the robotization of observation process.The collection emitter transfers to client with the resistivity real-time change of original position, realizes long-range in-situ monitoring.Thereby the present invention adopt continuous four electrode methods of plug-in type module can be vertically under the continuous coverage earth's surface water salt distribution in the real-time change continuous monitoring soil of soil resistivity in 0～20m, because change, the soil salinization of seawater intrusion, underground water table occurs in the generation that the different degree of depth therefore can the Simultaneous Monitoring three.Holard salt content and soil resistivity have good correlationship, thereby monitoring result has accuracy.Long-range, the original position of this cover monitoring system and method, synchronously, in real time, automatically, characteristics provide strong foundation for monitoring and warning seawater intrusion-underground water table-soil salinization accurately.
Description of drawings
Fig. 1 resistivity test device of the present invention and the structural representation that gathers emitter.
The general structure schematic diagram of Fig. 2 monitoring system of the present invention.
Fig. 3 two nylon modules of the present invention and between the decomposition texture schematic diagram of copper electrode ring.
The vertical view of Fig. 4 nylon module of the present invention (containing the load axle in figure).
Fig. 5 data acquisition process flow diagram of the present invention.
Fig. 6 data receiver program flow diagram of the present invention.
Fig. 7 resistivity test device bottom resistance of the present invention rate real-time change curve.
Fig. 8 resistivity test device of the present invention middle part resistivity real-time change curve.
Fig. 9 resistivity test device of the present invention top resistivity real-time change curve
Wherein, 1. conehead, 2. copper electrode ring, 3. nylon module, 4. wire, 5 central control units, the 6.GPRS module, 7. emitting antenna, 8. load axle, 9. resistivity test device, 10. gather emitter, 11. signal receivers, 12. host computers
Embodiment
As shown in Figure 1, 2, monitoring system of the present invention comprises the host computer 12 with signal receiver 11, and bottom and top are respectively equipped with conehead 1 and gather the resistivity test device 9 of emitter 10; Described resistivity test device 9 comprises the pluggable cylindric nylon module 3 of at least 5 hollows and is clipped in the interior copper electrode ring 2 of adjacent two nylon module 3 abutment joints; Described collection emitter 10 comprises the central control unit that includes control program 5 that is connected with each copper electrode ring 2 by wire 4, with the GPRS module 6 with emitting antenna 7 that is connected with central control unit 5.
Above-mentioned resistivity test device 9 is pegged graft with the copper electrode ring 2 in the abutment joint that is clipped in adjacent two nylon modules 3 by the pluggable nylon module 3 of 5～201 hollows and is formed, as shown in Figure 3.The height of nylon module 3 and inner and outer diameter can be chosen in 5～100mm, 20～60mm and 30～70mm scope respectively; Nylon module 3 can adopt the method for nylon pouring to make by mould.
Consistent in order to guarantee the spacing between electrode, make the conversion of measuring position and elevation convenient, the thickness of each copper electrode ring 2 is identical, is 0.5～1mm; External diameter 31～71mm need be slightly larger than the external diameter of nylon module in order to electrode retaining collar is exposed; Internal diameter 27～67mm, thus need can be clipped in two nylon module abutment joints greater than the internal diameter of nylon module.
For the ease of assembling and being conducive to injection, as shown in Figure 4, above-mentioned pluggable nylon module 3 can be nested with on 1 or 2 load axles 8, and load axle 8 surfaces can be threaded, and built vulcanized rubber in tube chamber, and made nylon module 3, copper electrode ring 2 and wire 4 become integral body.
GPRS module 6 is at the 900MHz/1800MHz net environment, and emitting antenna 7 is the GSM antenna.
Described host computer 12 as long-range receive and analysis device includes the client service program.
A kind of method of utilizing above-mentioned monitoring system Real-Time Monitoring seawater intrusion-underground water table-soil salinization comprises the following steps: (1) is carried out risk to coastal region and is reconnoitred assessment, chooses sampling point;
(2) to above-mentioned sampling point soil sampling, measure that this soil sample is saturated at seawater, fresh water is saturated and the resistivity of salt content when being 0.3%, respectively as the monitoring and warning threshold value on resistivity test device bottom, middle part and top;
(3) the nylon module is pegged graft, copper electrode ring of every two nylon module abutment joint inner clips, each copper electrode ring is drawn in the pipe that wire forms from the nylon module by being connected with central control unit, can be inserted with 1 or 2 load axle in pipe, cast vulcanized rubber in managing again, form resistivity test device, at its underpart grafting conehead, pegging graft at an upper portion thereof gathers emitter formation collection in worksite emitter.
The quantity of above-mentioned nylon module, height and inner and outer diameter can be respectively chosen in 5～201,5～100mm, 20～60mm and 30～70mm scope; The nylon module can adopt the method for nylon pouring to make by mould.Above-mentioned copper electrode ring thickness is 0.5mm; External diameter 31～71mm need be slightly larger than the external diameter of nylon module in order to electrode retaining collar is exposed; Internal diameter 27～67mm, thus need can be clipped in two nylon module abutment joints greater than the internal diameter of nylon module.
(4) according to the resistivity test device of the vertical injection respective numbers of sampling point situation of investigation in step 1, wherein injection mode is the hydraulic pressure injection.
(5) by host computer client service programming acquisition parameter, comprise the reference position of frequency acquisition and electrode retaining collar, and start real-time automatic monitoring; And the bottom, middle part and the top that resistivity test device are set according to the geologic condition of sampling point are respectively as the monitoring and warning position of seawater intrusion, underground water table and the soil salinization, after starting real-time automatic monitoring, resistivity test device begins the real-time collection and continual collection soil resistivity.
The setting of three monitoring locations of resistivity test device can be decided according to the geologic condition of sampling point, and the part of device in the fresh-water aquifer zone is set to the monitoring location of underground water table; The part of device bottom fresh-water aquifer is set to the monitoring location of seawater intrusion, and device is set to soil salinization monitoring location in the part of upper soll layer; Usually can be the length at the Depth determination resistivity test device middle part of fresh-water aquifer according to underground water table, even both are equal in length, and determine have what copper electrode rings to participate in the monitoring underground water table in the middle part of resistivity test device according to this length, the two-part copper electrode ring in remaining up and down is respectively used to monitor the soil salinization and seawater intrusion, and the length that wherein is used for the resistivity test device top of the monitoring soil salinization can be determined according to upper soll layer to the degree of depth in water-bearing zone; Also can directly each copper electrode ring of 1/3rd of upper, middle and lower be respectively used to monitor the soil salinization, underground water table and seawater intrusion.
(6) by the GPRS module, the resistivity signal is reached host computer in real time;
(7) host computer receives the real-time resistivity signal of original position transmission through signal receiver, the threshold value of warning that the client service program is default according to resistivity test device bottom, middle part and top, seawater intrusion is occuring, automatic monitoring warning during groundwater level fluctuation and during salination.
As follows according to the principle of Fig. 1 resistivity test device measured resistivity:
One group of Wenner device is comprised of four adjacent electrodes, be called A, M, N, the B utmost point, wherein A, B are transmitting electrode, and M, N are potential electrode, measure the medium electric conductivity between M, N electrode, calculated resistance rate ρ is as shown in formula (1), (2).After one group of Wenner device collection was complete, tolling measurement successively made progress.
In formula, K is electrode coefficient, Δ U
MNBe the voltage between potential electrode, I is the strength of current between transmitting electrode, and ρ is the apparent resistivity value of medium, and AM, AN, MN are respectively the distance between counter electrode.
Gather the data acquisition of emitter 9 as shown in Figure 5, at first by the initialization port, the collection initial parameter is set by host computer 12, set zero-time, reference position etc., with data acquisition module and transmitter module initialization, after arriving zero-time, resistivity test device 9 begins to gather from reference position, gatherer process constantly switches electrode, successively upwards continuous circulation collection.The real time data that collects transfers to long-range receive and analysis device by gathering emitter 10.Gather when arrival gathers the concluding time and stop.
The receiver operation flow process of long-range receive and analysis device as shown in Figure 6.Receiver adopts the RS232 interface to be connected with 12 of host computers, the data-signal that receives imports host computer into and stores, then adopt host computer 12 client service programs that the change in resistance curve that vertical resistivity value is depicted as certain depth is shown, when the Monitoring Data of resistivity test device 9 diverse locations surpasses the monitoring and warning threshold value, system's automatic alarm.
Embodiment
Take the Huanghe delta as example, this area exists general seawater intrusion, underground water table, soil salinization phenomenon.At first carry out risk and reconnoitre assessment, be chosen for sampling point.On-site sampling, measuring its soil resistivity when seawater is saturated is 0.28 Ω m, and resistivity is 42.4 Ω m when fresh water is saturated, and when salinity is 0.3%, resistivity is 3.35 Ω m, with this respectively as seawater intrusion, the threshold value of the monitoring and warning of underground water table and the soil salinization.According to the geologic condition (bury of groundwater is 0.8m approximately, and water-bearing zone thickness is 1m) of sampling point, design resistivity test device 9 length are 2m.The preparation external diameter is 50mm, and internal diameter is 40mm, is highly the mould of the annulus cylindricality of 20mm, adopts nylon to build and forms nylon module 3, and the forging external diameter is 51mm, and internal diameter 47mm, thickness are the copper electrode ring 2 of 0.5mm.Select 101 nylon modules 3 to peg graft and form feeler lever, 100 copper electrode rings 2 evenly are arranged between nylon module 3, the sealing of employing vulcanized rubber, resistivity test device 9 tops are installed collection emitter 10 and are connected by wire 4 with copper electrode ring 2, in the vertical injection soil of resistivity test device 9, buried depth 2m.Because four adjacent electrodes consist of one group of Wenner device, 100 electrode retaining collars consist of 97 electrode groups, if 30 of resistivity test device bottoms electrode group is used for the seawater intrusion monitoring, 40, middle part electrode group is used for water table measure, 27, top electrode group is used for soil salinization monitoring, arranges after the monitoring start time is 10min, and the monitoring reference position is first copper electrode rings 2 of resistivity test device 9 bottoms, every two-wheeled monitoring time is spaced apart 1min, starts Monitoring Service.After monitoring beginning, upwards gather successively soil resistivity from first copper electrode ring 2 of resistivity test device 9 bottoms, and the data that will gather storage are by gathering extremely long-range receive and analysis device of emitter 10 real-time Transmission.
In this process, by injecting the sea water simulation seawater intrusion, regulate groundwater level fluctuation, in the evaporation conditions Imitating soil salinization, the change in resistance of long-range receive and analysis device Real Time Monitoring resistivity test device 9 diverse locations, from Fig. 7,8,9 as seen:
1. when beginning seawater intrusion occurs, the fast reducing stage appears in the resistivity of the electrode measurement of resistivity test device bottom monitoring position, after seawater intrusion reaches maximum, change in resistance tends towards stability, and reaches bottom seawater intrusion threshold value 0.28 Ω m, system alarm.
2. along with water level constantly changes, the medium position that the threshold value of resistivity test device is made as 42.4 Ω m monitors water level and changes up and down.Wherein resistivity measurements is that the copper electrode ring place of 42.4 Ω m is the water level position, and water level is aeration zone more than the position, can judge underground water table thus.
3. be accompanied by the evaporation of moisture, salinity constantly gathers at upper soll layer, the resistivity of the electrode measurement at monitoring location place, resistivity test device top reaches soil salinization threshold value of warning 3.35 Ω m, system alarm, and the degree that can occur according to the correlationship judgement salination of resistivity and salt content.
Claims (9)
1. the system of Real-Time Monitoring seawater intrusion-underground water table-soil salinization, comprise the host computer (12) with signal receiver (11), and bottom and top be respectively equipped with conehead (1) and gather the resistivity test device (9) of emitter (10), it is characterized in that described resistivity test device (9) comprises the pluggable cylindric nylon module (3) of at least 5 hollows and is clipped in the interior copper electrode ring (2) of adjacent two nylon modules (3) abutment joint; Described collection emitter (10) comprises the central control unit that includes control program (5) that is connected with each copper electrode ring (2) by wire (4), with the GPRS module (6) with emitting antenna (7) that is connected with central control unit (5).
2. monitoring system as claimed in claim 1 is characterized in that above-mentioned resistivity test device (9) by the pluggable nylon module (3) of 5～201 hollows and is clipped in copper electrode ring (2) in the abutment joint of adjacent two nylon modules (3) pegging graft and forming.
3. monitoring system as claimed in claim 1 or 2 is characterized in that the height of above-mentioned nylon module and inner and outer diameter are respectively in 5～201,5～100mm, 20～60mm and 30～70mm scope.
4. monitoring system as claimed in claim 1 or 2, is characterized in that above-mentioned copper electrode ring thickness is 0.5～1mm, and external diameter is 31～71mm, and internal diameter is 27～67mm.
5. monitoring system as claimed in claim 1, it is characterized in that above-mentioned pluggable nylon module (3) is nested with on 1 or 2 load axles (8), and built vulcanized rubber in the tube chamber that nylon module (3) is overlapped, and made nylon module (3), copper ring electrode (2) and wire (4) become integral body.
6. method of utilizing the described monitoring system in-situ synchronization of claim 1 Real-Time Monitoring seawater intrusion-underground water table-soil salinization comprises that (1) choose sampling point in the area by the sea; Characterized by further comprising following steps:
(2) to above-mentioned sampling point soil sampling, measure that this soil sample is saturated at seawater, fresh water is saturated and the resistivity of salt content when being 0.3%, as the monitoring and warning threshold value on resistivity test device bottom, middle part and top;
(3) copper electrode ring and nylon module are mutually pegged graft and consisted of resistivity test device;
(4) at the vertical injection resistivity test device in sampling point place;
(5) by host computer client service programming acquisition parameter, and start real-time automatic monitoring;
(6) by the GPRS module, the resistivity signal is reached host computer in real time;
(7) host computer receives the real-time resistivity signal of original position transmission through signal receiver, the threshold value of warning that the client service program of host computer is default according to resistivity test device bottom, middle part and top, seawater intrusion is occuring, automatic monitoring warning during groundwater level fluctuation and during salination.
7. monitoring method as claimed in claim 6, is characterized in that in above-mentioned steps 2, according to the length in the middle part of the Depth determination resistivity test device of underground water table, determines the length on resistivity test device top to the degree of depth in water-bearing zone according to upper soll layer; Perhaps each copper electrode ring of 1/3rd of upper, middle and lower is respectively used to monitor the soil salinization, underground water table and seawater intrusion.
8. monitoring method as claimed in claim 6, is characterized in that in above-mentioned steps 5, and the acquisition parameter of setting comprises the reference position that frequency acquisition and copper electrode ring are measured.
9. monitoring method as claimed in claim 6, is characterized in that in above-mentioned steps 7, and when beginning that seawater intrusion occurs and invade the bottom, water-bearing zone, the resistivity test device bottom position reaches its threshold value of warning, and at first host computer sends and the seawater intrusion alarm occurs; When resistivity test device middle part has the copper electrode ring threshold value of resistivity value of fresh water saturated soil to occur reaching and during the rate that has a resistance sudden change, host computer is according to the real time position of the degree of depth judgement underground water table of this copper electrode ring; When resistivity test device top had the copper electrode ring to monitor resistivity value over its threshold value of warning, host computer sent soil salinization early warning.
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