CN102305814A - 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 disaster monitoring and warning field.
Background technology
Seawater intrusion is a kind of environmental geology deterioration phenomenon of contaminating the fresh groundwater layer owing to the seawater that land fresh groundwater decline of water table causes.Salinity accumulates to upper soll layer through capillary force and will cause the soil salinization in the seawater intrusion process.More shallow when underground water table ratio, a large amount of water evaporates causes salinity in soil, to gather, and 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.Take place can cause water quality deterioration after the 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 influences industrial and agricultural production and population quality and social stability.
Mostly the monitoring for seawater intrusion, underground water table, the soil salinization at present is single purpose monitoring, and promptly a kind of method can only be monitored a kind of in above-mentioned three kinds of phenomenons, and can not monitor three indexs simultaneously.The common monitoring method of seawater intrusion has: water chemistry sample collecting and lab analysis method; Flame Image Process method and isotope method and time domain resistivity imaging method; Lab analysis method effective poor; Limited resource is also many; The shortcoming of Flame Image Process method 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 big, 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 the remote sensing method and the chromatography of ions.The remote sensing method has the monitoring hysteresis quality, can't monitor in real time; The chromatography of ions is poor for applicability, is only applicable to the laboratory monitoring.
Seawater intrusion-underground water table-soil salinization three influences each other, and is closely related, yet for the also rare research of three's synchronous monitoring.A kind of system and method for can in-situ synchronization monitoring seawater intrusion-underground water table-soil salinization in real time 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 deficiency of prior art.
Technical scheme of the present invention be through long-range, original position, in real time, the resistivity value in the measured soil certain limit automatically; Real-time change judgment seawater intrusion according to soil different depth resistivity; Whether the underground water table and the soil salinization take place, thereby realize three's in-situ synchronization real-time automatic monitoring.Specifically be casting certain pluggable nylon module of specification and copper electrode ring, it pegged graft form resistivity test device that the electrode copper ring of resistivity test device is connected through lead with the collection emitting device, forms the collection in worksite emitter.Vertical resistivity in the real-time collection soil of collection in worksite emitter, and transmit a signal to long-range receiving and analyzing device.Real-time change and generation seawater intrusion according to soil different depth resistivity; The resistivity threshold value of warning of the groundwater level fluctuation and the soil salinization; Judge by software analysis whether the three takes place, thereby in-situ synchronization is monitored seawater intrusion-underground water table-soil salinization process in real time.
The system of a kind of real-time monitoring seawater intrusion-underground water table-soil salinization comprises the host computer that has signal receiver, it is characterized in that also comprising that bottom and top are respectively equipped with the resistivity test device of conehead and collection emitting device; Described resistivity test device comprises the pluggable cylindric nylon module and the copper electrode ring that is clipped in adjacent two nylon module abutment joints of at least 5 hollows; Described collection emitting device comprises the central control unit that includes control program that is connected with each copper electrode ring through lead, with the GPRS module that has emitting antenna that links to each other 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 the 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 help 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 the tube chamber, and makes nylon module, copper electrode ring and lead become integral body.
The GPRS module is under the 900MHz/1800MHz network environment, and antenna is the GSM antenna.
Described host computer includes the client service program as long-range receiving and analyzing device.
A kind ofly utilize above-mentioned monitoring system in-situ synchronization to monitor the method for seawater intrusion-underground water table-soil salinization in real time, comprise that (1) choose sampling point in the area by the sea; It is characterized in that further comprising the steps of:
(2), measure that this soil sample is saturated at seawater, fresh water is saturated and salt content is 0.3% o'clock a resistivity, as the monitoring and warning threshold value on resistivity test device bottom, middle part and top to above-mentioned sampling point soil sampling;
(3) copper electrode ring and nylon module are pegged graft each other and constitute resistivity test device;
(4) the vertical injection resistivity test device at the sampling point place;
(5) through host computer client service program acquisition parameter is set, and starts real-time automatic monitoring;
(6) through the GPRS module resistivity signal in real time is reached host computer;
(7) host computer receives the real-time resistivity signal of original position transmission through signal receiver; The client service program of host computer is according to resistivity test device bottom, the preset threshold value of warning in middle part and top; Seawater intrusion is taking place, automatic monitoring warning during groundwater level fluctuation and during salination.
In the step 1, need 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, the specification and the number of decision resistivity test device.
In the step 2; When seawater invasion takes place; The sphenoid of degree of saltiness water interface can be followed seawater invasion and constantly migrate to bottom the water-bearing layer; Therefore the resistivity data of bottom, water-bearing layer degree of saltiness water interface place collection just has evident 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 seawater saturated soil, fresh water saturated soil; And salt content is the resistivity of 0.3% soil; Judge seawater invasion as the resistivity test device bottom respectively, the standard of the level of ground water and the top judgement soil salinization is judged at the middle part.
In the step 3; The nylon module is pegged graft; Copper electrode ring of folder in per two nylon module abutment joints; Each copper electrode ring is drawn in the pipe that lead forms from the nylon module through being connected with central control unit; Can be inserted with 1 or 2 load axle in the pipe, the cast vulcanized rubber forms resistivity test device in will managing again; The grafting conehead in its underpart, the collection emitting of pegging graft at an upper portion thereof device forms the 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 cast to make through 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 so that 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 the step 4, according to the resistivity test device of the vertical injection respective numbers of sampling point situation of investigation in the step 1, wherein injection mode is the hydraulic pressure injection.
In the step 5; Acquisition parameter comprises the reference position that frequency acquisition and copper electrode ring are measured; And the 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 according to the geologic condition of sampling point; Start after the real-time automatic monitoring, resistivity test device begins real-time continuous 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 the 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 the step 7, the generating process of host computer dynamic synchronization monitoring seawater intrusion, underground water table, the soil salinization is according to the position difference of three's generation and monitoring threshold is different separately.
When beginning that seawater intrusion takes place 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 when this its threshold value of warning of monitoring location arrival be seawater when saturated, host computer at first is emitted in the alarm that occurs seawater intrusion here.
WATER LEVEL CHANGES generally changes in the scope of water-bearing layer; The soil bottom at level of ground water 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 the diverse location at resistivity test device middle part along with the change of level of ground water; When resistivity test device middle part had the copper electrode ring threshold value and the rate that the has a resistance sudden change of resistivity value of fresh water saturated soil to occur reaching, host computer was judged the real time position of level of ground water according to the degree of depth 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 here; So when resistivity test device top had the copper electrode ring to monitor the resistivity value above 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 the monitoring cost.Through being set, monitoring zero-time, position and monitoring time realized the robotization of observation process at interval.The collection emitting device 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 face of land water salt distribution in the real-time change continuous monitoring soil of soil resistivity in 0～20m because seawater intrusion, the change of underground water table, the soil salinization occur in the generation that the different degree of depth therefore can the synchronous 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, characteristic of accurate is that monitoring and warning seawater intrusion-underground water table-soil salinization provides strong foundation.
Description of drawings
The structural representation of Fig. 1 resistivity test device of the present invention and collection emitting device.
The general structure synoptic diagram of Fig. 2 monitoring system of the present invention.
Fig. 3 two nylon modules of the present invention and between the decomposition texture synoptic diagram of copper electrode ring.
The vertical view of Fig. 4 nylon module of the present invention (containing the load axle among the figure).
Fig. 5 data acquisition process flow diagram of the present invention.
Fig. 6 Data Receiving 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. lead, 5 central control units, 6.GPRS module, 7. emitting antenna, 8. load axle, 9. resistivity test device, 10. collection emitting device, 11. signal receivers, 12. host computers
Embodiment
Like Fig. 1, shown in 2, monitoring system of the present invention comprises that the host computer 12 that has signal receiver 11 and bottom and top are respectively equipped with the resistivity test device 9 of conehead 1 and collection emitting device 10; Described resistivity test device 9 comprises the pluggable cylindric nylon module 3 and the copper electrode ring 2 that is clipped in adjacent two nylon module 3 abutment joints of at least 5 hollows; Described collection emitting device 10 comprises the central control unit that includes control program 5 that is connected with each copper electrode ring 2 through lead 4, with the GPRS module 6 that has emitting antenna 7 that links to each other 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 cast to make through mould.
Consistent in order to guarantee the spacing between the 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 so that 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 help 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 the tube chamber, and made nylon module 3, copper electrode ring 2 and lead 4 become integral body.
Described host computer 12 as long-range receiving and analyzing device includes the client service program.
A kind of method of utilizing above-mentioned monitoring system to monitor seawater intrusion-underground water table-soil salinization in real time may further comprise the steps: (1) is carried out risk to coastal region and is reconnoitred assessment, chooses sampling point;
(2), measure that this soil sample is saturated at seawater, fresh water is saturated and salt content is 0.3% o'clock a resistivity, respectively as the monitoring and warning threshold value on resistivity test device bottom, middle part and top to above-mentioned sampling point soil sampling;
(3) the nylon module is pegged graft; Copper electrode ring of folder in per two nylon module abutment joints; Each copper electrode ring is drawn in the pipe that lead forms from the nylon module through being connected with central control unit; Can be inserted with 1 or 2 load axle in the pipe; Cast vulcanized rubber in will managing again; Form resistivity test device, the grafting conehead in its underpart, the collection emitting of pegging graft at an upper portion thereof device forms the 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 cast to make through 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 so that 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 the step 1, wherein injection mode is the hydraulic pressure injection.
(5) through host computer client service program acquisition parameter is set, comprises 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; Start after the real-time automatic monitoring, resistivity test device begins real-time continuous 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 in the fresh-water aquifer bottom 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 that the degree of depth of fresh-water aquifer is confirmed the resistivity test device middle part according to underground water table; Even both equal in length; And confirm that according to this length what copper electrode rings resistivity test device middle part has participate in monitoring underground water table; Remaining up and down two-part copper electrode ring then is respectively applied for the monitoring soil salinization and seawater intrusion, and the length that wherein is used to monitor the resistivity test device top of the soil salinization can be confirmed according to the degree of depth in upper soll layer to water-bearing zone; Also can directly following each copper electrode ring of 1/3rd in going up be respectively applied for the monitoring soil salinization, underground water table and seawater intrusion.
(6) through the GPRS module resistivity signal in real time is reached host computer;
(7) host computer receives the real-time resistivity signal of original position transmission through signal receiver; The client service program is according to resistivity test device bottom, the preset threshold value of warning in middle part and top; Seawater intrusion is taking place, automatic monitoring warning during groundwater level fluctuation and during salination.
Principle according to Fig. 1 resistivity test device measured resistivity is following:
One group of Wenner device is made up of four adjacent electrodes, is called A, M, N, the B utmost point respectively, and wherein A, B are transmitting electrode, and M, N are potential electrode, measures the medium electric conductivity between M, the N electrode, and calculated resistance rate ρ is shown in formula (1), (2).After one group of Wenner device finishing collecting, tolling measurement successively makes progress.
In the formula, K is an 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.
The data acquisition of collection emitting device 9 as shown in Figure 5; At first through the initialization port 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, and continuous circle collection successively makes progress.The real time data that collects transfers to long-range receiving and analyzing device through collection emitting device 10.When the concluding time is gathered in arrival, gather and stop.
The receiver operation flow process of long-range receiving and analyzing 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; Adopt host computer 12 client service programs that the change in resistance curve that vertical resistivity value is depicted as certain depth is shown then; When the Monitoring Data of resistivity test device 9 diverse locations surpassed the monitoring and warning threshold value, system reported to the police automatically.
Embodiment
With the Huanghe delta is example, and 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 salinity is that 0.3% o'clock resistivity is 3.35 Ω m; With this respectively as seawater intrusion, the threshold value of the monitoring and warning of the underground water table and the soil salinization.According to the geologic condition (the about 0.8m of bury of groundwater, water-bearing zone thickness are 1m) of sampling point, design resistivity test device 9 length are 2m.The preparation external diameter is 50mm, and internal diameter is 40mm, highly is 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 installed between the nylon module 3; The sealing of employing vulcanized rubber; Resistivity test device 9 tops are installed collection emitting device 10 and are connected through lead 4 with copper electrode ring 2; In resistivity test device 9 vertical injection soil, buried depth 2m.Because four adjacent electrodes constitute one group of Wenner device; Then 100 electrode retaining collars constitute 97 electrode groups; If 30 the electrode groups in resistivity test device bottom are used for the seawater intrusion monitoring; 40 the electrode groups in middle part are used for water table measure; 27 the electrode groups in top are used for soil salinization monitoring, are provided with 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 the monitoring beginning, first copper electrode ring 2 collection soil resistivity upwards successively from resistivity test device 9 bottoms, and the data that will gather storage are through collection emitting device 10 real-time Transmission long-range receiving and analyzing device extremely.
In this process, through injecting the sea water simulation seawater intrusion, regulate groundwater level fluctuation, the simulation soil salinization under evaporation conditions, the change in resistance of the real-time monitored resistance rate of long-range receiving and analyzing device measurement mechanism 9 diverse locations, from Fig. 7,8,9 it is thus clear that:
1. when beginning seawater intrusion takes place; The quick reduction stage appears in the resistivity of the electrode measurement at monitoring location place, resistivity test device bottom; Change in resistance tended towards stability after seawater intrusion reached maximum, reached 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, is aeration zone more than the water level 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 can judge the degree that salination takes place according to the correlationship of resistivity and salt content.
Claims (9)
1. real-time system of monitoring seawater intrusion-underground water table-soil salinization; Comprise the host computer (12) that has signal receiver (11), it is characterized in that also comprising that bottom and top are respectively equipped with the resistivity test device (9) of conehead (1) and collection emitting device (10); Described resistivity test device (9) comprises the pluggable cylindric nylon module (3) of at least 5 hollows and is clipped in the copper electrode ring (2) in adjacent two nylon modules (3) abutment joint; Described collection emitting device (10) comprises the central control unit that includes control program (5) that is connected with each copper electrode ring (2) through lead (4), with the GPRS module (6) that has emitting antenna (7) that links to each other with central control unit (5).
2. monitoring system as claimed in claim 1 is characterized in that above-mentioned resistivity harvester (9) is by the pluggable nylon module (3) of 5～201 hollows be clipped in copper electrode ring (2) in the abutment joint of adjacent two nylon modules (3) and peg graft and form.
3. monitoring system as claimed in claim 1 or 2, height and the inner and outer diameter that it is characterized in that above-mentioned nylon module 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 lead (4) become integral body.
6. method of utilizing the said monitoring system in-situ synchronization of claim 1 to monitor seawater intrusion-underground water table-soil salinization in real time comprises that (1) choose sampling point in the area by the sea; It is characterized in that further comprising the steps of:
(2), measure that this soil sample is saturated at seawater, fresh water is saturated and salt content is 0.3% o'clock a resistivity, as the monitoring and warning threshold value on resistivity test device bottom, middle part and top to above-mentioned sampling point soil sampling;
(3) copper electrode ring and nylon module are pegged graft each other and constitute resistivity test device;
(4) the vertical injection resistivity test device at the sampling point place;
(5) through host computer client service program acquisition parameter is set, and starts real-time automatic monitoring;
(6) through the GPRS module resistivity signal in real time is reached host computer;
(7) host computer receives the real-time resistivity signal of original position transmission through signal receiver; The client service program of host computer is according to resistivity test device bottom, the preset threshold value of warning in middle part and top; Seawater intrusion is taking place, automatic monitoring warning during groundwater level fluctuation and during salination.
7. monitoring method as claimed in claim 6 is characterized in that in the above-mentioned steps 2, confirms the length at resistivity test device middle part according to the degree of depth of underground water table, confirms the length on resistivity test device top according to the degree of depth in upper soll layer to water-bearing zone; Each copper electrode ring of 1/3rd is respectively applied for the monitoring soil salinization, underground water table and seawater intrusion under in perhaps will going up.
8. monitoring method as claimed in claim 6 is characterized in that in the 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 the above-mentioned steps 7, and when beginning that seawater intrusion takes place and invade the bottom, water-bearing zone, the resistivity test device bottom position reaches its threshold value of warning, and host computer at first sends and the seawater intrusion alarm occurs; When resistivity test device middle part had the copper electrode ring threshold value and the rate that the has a resistance sudden change of resistivity value of fresh water saturated soil to occur reaching, host computer was judged the real time position of underground water table according to the degree of depth of this copper electrode ring; When resistivity test device top had the copper electrode ring to monitor the resistivity value above its threshold value of warning, host computer sent soil salinization early warning.
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