CN102141534B - Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device - Google Patents
Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device Download PDFInfo
- Publication number
- CN102141534B CN102141534B CN 201110009794 CN201110009794A CN102141534B CN 102141534 B CN102141534 B CN 102141534B CN 201110009794 CN201110009794 CN 201110009794 CN 201110009794 A CN201110009794 A CN 201110009794A CN 102141534 B CN102141534 B CN 102141534B
- Authority
- CN
- China
- Prior art keywords
- electrode
- conductivity
- circuit
- well
- distributed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses a seawater invasion monitoring method. The method comprises the following steps of: arranging a host and distributed measuring electrodes, wherein the distributed measuring electrodes are arranged in a geological disaster seawater invasion observation well, and recording the depth of the well where each electrode is located; selecting a test electrode, electrifying the selected electrode to make the electrode form a loop through well liquid, and measuring voltages of two ends of a sample resistor which is connected in series to the interior of the loop; acquiring a conductivity numerical value of the well liquid of the electrode according to the voltages; and determining a demarcation situation of freshwater according to the conductivity numerical value and the depth of the well where each electrode is located, so as to realize monitoring of a seawater invasion situation. The invention also discloses a distributed conductivity geological disaster monitoring device. By acquisition of the conductivity numerical value of the well liquid with different depths in the geological disaster seawater invasion observation well, based on a linear relationship between the conductivity of water and salt content, according to the conductivity numerical value and the depth of the well where each electrode is located, the demarcation situation of the freshwater is determined, and the monitoring of the seawater invasion situation is finished conveniently, quickly and correctly.
Description
Technical field
The present invention relates to the geologic hazard monitoring technical field, particularly relate to a kind of seawater intrusion monitoring method and distributed conductivity geologic hazard monitoring device.
Background technology
Seawater intrusion is owing to the fresh groundwater water level seawater cause that descends in land recharges the spontaneous phenomenon that infects the fresh groundwater layer.Refer to that namely seawater passes through pervious bed (comprising aquitard) and infiltrates the lower light water-bearing zone, land of water level.Generally speaking, the water table ratio sea level fluctuations height in light water-bearing zone, land, but through long-term a large amount of light water-bearing zones, land of extracting, can make its underground water table be lower than sea level fluctuations, cause seawater (salt water) to infiltrate in the light water-bearing zone, land by pervious bed, thereby destroy groundwater resource.
According to data, the phenomenon of the fresh-water aquifer of China's Coastal Areas seawater intrusion in recent years takes place repeatedly, relates to a plurality of provinces such as Liaoning, Hebei, Tianjin, Shandong, Guangxi, Hainan from north orientation south.Wherein, Bohai Rim's seawater intrusion development is particularly rapid, and only seawater intrusion area in 2003 just reaches 2457 sq-kms, has increased by 937 sq-kms than the late 1980s, increases by 62 sq-kms (being derived from China Geological Survey Bureau) every year on average.
The seawater intrusion region makes underground water generation one-tenthization in various degree, can cause the coastland water quality deterioration, and reduce in the irrigation water seedbed; Soil ecosystem is unbalance, and cultivated land resource is degenerated; Industrial and agricultural production is affected; Reduce the population health level, influence social stability; Will cause the deterioration of natural ecological environment at last.Cause very big loss for the country and people masses' property and productive life.
Present domestic reply seawater intrusion is mainly to monitor, to put prevention first.Monitoring means is mainly with geophysical prospecting method, laying seawater intrusion observation port and target isotope method monitoring seawater intrusion situation.The marine invasion area takes place and has set up seawater intrusion and soil salinization monitoring station as provinces such as Shandong, Hebei in big of China, lay the underground water observation port of some and monitored seawater intrusion, measure water level with lining rope, method monitoring seawater intrusion situations such as salt content are determined in the water intaking chemical examination.
Workload was big when above-mentioned these seawater intrusion monitoring meanss were implemented, and process is loaded down with trivial details, and data are handled poor accuracy.
Summary of the invention
The problem to be solved in the present invention provides a kind of seawater intrusion monitoring method and distributed conductivity geologic hazard monitoring device, and workload is big when implementing the seawater intrusion monitoring in the prior art to overcome, and process is loaded down with trivial details, and data are handled the defective of poor accuracy.
For achieving the above object, technical scheme of the present invention provides a kind of seawater intrusion monitoring method, said method comprising the steps of:
A, main frame is laid near the safe part geologic hazard inspection well, the distributed measurement electrode is laid in the geologic hazard body seawater intrusion inspection well, and the well depth at each electrode place on the record distributed measurement electrode;
B, selection test electrode, and give selected electrifying electrodes, make described electrode form the loop by well liquid, measure the voltage that is connected on the sampling resistor two ends in the described loop;
C, obtain the conductivity values of described electrode place well liquid according to described voltage;
D, according to the conductivity values of each electrode on the described distributed measurement electrode and the well depth at described electrode place, be specified to the boundary situation of fresh water, realize the monitoring to the seawater intrusion situation.
Wherein, in described steps A, described distributed measurement electrode in axial direction distributes perpendicular to ground in described inspection well.
Wherein, in described step B, the employing frequency is that amplitude unanimity, the dutycycle of 1000Hz, positive negative pulse stuffing is that 50% square-wave pulse is given selected electrifying electrodes.
Wherein, in described step C, according to formula
Calculate the conductivity values of described electrode place well liquid; Wherein Kx is conductivity values, and Q is the electrode coefficient, V
AbBe the magnitude of voltage of described square-wave pulse, R2 is the resistance value of sampling resistor, and Vm is the magnitude of voltage at sampling resistor two ends, and R0 is the resistance value of cable between described main frame and the distributed measurement electrode, and R1 is the resistance value of divider resistance.
Wherein, in described step C, according to the conductivity values of the described electrode of formula Kx=10000/ (718-290*Vm) calculating place well liquid, wherein, the unit of Vm is V, and the unit of Kx is mS/cm.
Technical scheme of the present invention also provides a kind of distributed conductivity geologic hazard monitoring device, and described device comprises main frame and distributed measurement electrode, is connected by cable between described main frame and the distributed measurement electrode;
Described main frame is laid near the safe part of geologic hazard body, comprising:
Electrode is selected circuit, is used for selecting the test electrode of selecting to be switched on;
The electrode power supply circuit is used for giving the electrifying electrodes of selecting;
The electrode commutation circuit is used for the selection result according to described electrode selection circuit, the electrode of selecting is switched to the electrode power supply circuit switch on;
Signal sample circuit is used for signals collecting is carried out in the loop that well liquid between electrode power supply circuit, electrode and electrode after the energising forms;
Main control unit and data acquisition circuit are used for control and finish electrode selection, electrode switching, data acquisition process and storage;
Described distributed measurement electrode is laid in the geologic hazard body seawater intrusion inspection well everywhere, in axial direction distributes perpendicular to ground in described inspection well.
Wherein, described main control unit and data acquisition circuit comprise:
The conductivity acquiring unit is used for according to formula
Calculate the conductivity values of described electrode place well liquid; Wherein Kx is conductivity values, and Q is the electrode coefficient, V
AbBe the magnitude of voltage of described square-wave pulse, R2 is the resistance value of sampling resistor, and Vm is the magnitude of voltage at sampling resistor two ends, and R0 is the resistance value of cable between described main frame and the distributed measurement electrode, and R1 is the resistance value of divider resistance;
The boundary determining unit is used for the well depth according to each electrode place on described conductivity values and the described distributed measurement electrode, is specified to the boundary situation of fresh water.
Wherein, described main frame also comprises storer, is used for the status information of the electrode of the described conductivity values of storage and correspondence.
Wherein, to be output as amplitude unanimity, dutycycle that frequency is 1000Hz, positive negative pulse stuffing be 50% square-wave pulse to described electrode power supply circuit.
Wherein, the described distributed measurement electrode number of poles that powers on is 2 to 30.
Compared with prior art, technical scheme of the present invention has following advantage:
The present invention is by the collection to the conductivity values of the well liquid of different depth in the geologic hazard body seawater intrusion inspection well everywhere, utilize electrical conductivity of water and salt content linear, well depth according to conductivity values and electrode place, be specified to the boundary situation of fresh water, the convenient, fast and accurate monitoring of finishing the seawater intrusion situation.Test data accuracy height of the present invention is convenient to be utilized by ground calamity monitoring net.
Description of drawings
Fig. 1 a of the present inventionly is lower than seawater intrusion well depth-conductivity variations synoptic diagram under the invasion sea level fluctuations situation at the fresh water water level;
Fig. 1 b invades seawater intrusion well depth-conductivity variations synoptic diagram under the sea level fluctuations situation of the present invention being higher than at the fresh water water level;
Fig. 2 is the system chart of a kind of distributed conductivity geologic hazard monitoring device of the embodiment of the invention;
Fig. 3 is the circuit theory diagrams of main frame of the distributed conductivity geologic hazard monitoring device of the embodiment of the invention;
Fig. 4 is the structured flowchart of the EPC-2901 industrial control board of the embodiment of the invention;
Fig. 5 is the A/D input connection diagram of the EPC-2901 industrial control board of the embodiment of the invention;
Fig. 6 is the input of 50 pins, the output interface pinouts 6 of the MiniISA-8032A of the embodiment of the invention;
Fig. 7 drives outside relay connection diagram for the isolation digital quantity output channel of the MiniISA-8032A of the embodiment of the invention;
Fig. 8 is the schematic diagram of the electrode power supply circuit of the embodiment of the invention;
Fig. 9 is the schematic diagram of the signal sample circuit of the embodiment of the invention;
Figure 10 is the schematic diagram of the electrode commutation circuit of the embodiment of the invention;
Figure 11 is the process flow diagram of a kind of seawater intrusion monitoring method of the embodiment of the invention;
Figure 12 is the Conductivity Calculation equivalent circuit diagram of the embodiment of the invention;
Figure 13 is the on-the-spot scheme of installation of the distributed conductivity geologic hazard monitoring device of the embodiment of the invention;
Figure 14 is H15 observation port " well depth-conductivity curve " figure that draws according to the test data table;
Figure 15 is north 20 observation ports " well depth-conductivity curve " figure that draws according to the test data table;
Figure 16 is Nan Meng village observation port " well depth-conductivity curve " figure that draws according to the test data table.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Because how much relevant the conductivity of water (stratum) is with its salt content, generally constantly increases the also corresponding increase of the conductivity of water (stratum) with salt.Therefore, the present invention divides degree of saltiness water level interphase by the method for testing well liquid (stratum) conductivity.Usually degree of saltiness water level interphase is a transitional zone.Fig. 1 a, Fig. 1 b are respectively the fresh water water level and are lower than and are higher than seawater intrusion well depth-conductivity variations synoptic diagram under the invasion sea level fluctuations situation.
Embodiment one
The system chart of a kind of distributed conductivity geologic hazard monitoring device of the embodiment of the invention as shown in Figure 2, described device comprises main frame and a plurality of electrode, is connected by cable between described main frame and the distributed measurement electrode;
The circuit theory diagrams of main frame as shown in Figure 3, described main frame is laid near the safe part geologic hazard body, comprising:
Electrode is selected circuit, is used for selecting test electrode to be switched on;
The electrode power supply circuit, the electrifying electrodes of be used for to give selecting, it is 50% square-wave pulse that described electrode power supply circuit is output as amplitude unanimity, dutycycle that frequency is 1000Hz, positive negative pulse stuffing;
The electrode commutation circuit is used for the selection result according to described electrode selection circuit, the electrode of selecting is switched to the electrode power supply circuit switch on;
Signal sample circuit is used for signals collecting is carried out in the loop that well liquid between electrode power supply circuit, electrode and electrode after the energising forms;
Storer is for the status information of the electrode of storing described conductivity values and correspondence.
Main control unit and data acquisition circuit are used for control and finish electrode selection, electrode switching, data acquisition process and storage; Described main control unit and data acquisition circuit comprise conductivity acquiring unit and boundary determining unit.The conductivity acquiring unit is used for according to formula
Calculate the conductivity values of described electrode place well liquid; Wherein Kx is conductivity values, and Q is the electrode coefficient, V
AbBe the magnitude of voltage of described square-wave pulse, R2 is the resistance value of sampling resistor, and Vm is the magnitude of voltage at sampling resistor two ends, and R0 is the resistance value of cable between described main frame and the distributed measurement electrode, and R1 is the resistance value of divider resistance; The boundary determining unit is used for the well depth according to described conductivity values and described electrode place, is specified to the boundary situation of fresh water.
Described electrode is laid in the geologic hazard body seawater intrusion inspection well everywhere, in axial direction distributes perpendicular to ground in described inspection well, and described distributed measurement electrode top electrode quantity is 2 to 30.
Described device also comprises utility appliance (computer and printer etc.), the 12V storage battery of powering.The 12V storage battery provides power supply by power converting circuit for system, and governor circuit control complete machine is finished electrode selection, electrode switching, data acquisition process and storage.Can finish (as detecting several times every day in when monitoring) detection time by software set.The data (conductivity value) that detect reach the electrode sequence number in chronological order and are recorded in the storer (card), can watch by computing machine at any time checking conductivity data and being depicted as " well depth-conductivity " curve by distributed conductivity geologic hazard monitor data processing software.Well depth--conductivity curve can reflect into the boundary situation of fresh water intuitively.
Each ingredient to distributed conductivity geologic hazard monitoring device of the present invention is elaborated below.
1, main frame
(1) main control unit and data acquisition circuit, storer: use the EPC-2901 industrial control board, selecting purpose for use is to give security for the exploitation of further upgrading of system from now on, and the structured flowchart of this EPC-2901 industrial control board as shown in Figure 4.EPC-2901 is based on the extendible embedded industrial control mainboard of 32 ARM7 processor LPC2378, supports 10/100M Ethernet (technical grade), 1 road CAN interface (technical grade), CF clamping mouth, plate to carry functions such as data Flash, A/D conversion, low-power consumption independence RTC.Can realize easily that CF card, plate carry functions such as data Flash read-write, are particularly suitable for occasions such as data recording and communication Protocol Conversion.The EPC-2901 industrial control board provides MiniISA bus interface for the user simultaneously, can articulate MiniISA series intelligent data integrated circuit board by this interface.
Ardware feature is as follows:
Communication: 1 road 10/100M Ethernet; 4 road RS-232C interfaces (UART1 is the Modem mouth); 1 road CAN interface;
Analog quantity: 4 passages (AIN0～AIN3) analog quantity A/D input, 10 bit resolutions, single channel low 2.44 μ s switching time, wherein the AIN3 passage is supported 10 D/A outputs;
Digital quantity: the buffering input of 4 road digital quantities, optionally catch input; The output of 4 road digital quantities buffering, optional PWM output;
Extend out storage: the CF clamping; The 2MB plate carries NOR Flash; 64KB SRAM;
Other: 1 tunnel High Speed I
2The C bus interface; Support the MiniISA bus; External hardware watchdog; External RTC clock;
Mainly by the buffering input/output circuitry, modules such as serial communication circuit, external storage system, power management constitute the EPC-2901 industrial control mainboard, and system chart as shown in Figure 7.
The EPC-2901 industrial control mainboard adopts 5V direct current single power supply.Require the power supply precision in ± 5%, maximum input current is 2A.Can be in-40 ℃～+ 80 ℃ wide temperature ranges steady operation, satisfy the various application demands of technical grade product.
The A/D that EPC-2901 provides and the input of D/A are 0～2.5V, therefore must guarantee to be input to the signal amplitude of A/D input end between 0～2.5V.Its A/D input connection diagram as shown in Figure 5.
(2) electrode is selected circuit: use MiniISA-8032A MiniISA bus digital quantity input/output cards.This bus provides 16 the tunnel to isolate digital quantity input channel and 16 tunnel isolation digital quantity output channels, uses two MiniISA-8032A by the driving of relay being finished the selection to 30 conductance electrodes.MiniISA-8032A finishes electrical equipment by the MiniISA bus with the EPC-2901 industrial control mainboard and is connected.The 50 pins input of MiniISA-8032A, output interface pin are seen Fig. 6, and Fig. 7 drives outside relay connection diagram for isolating the digital quantity output channel.
MiniISA-8032A 50 pins are imported, the output interface pin function is as shown in table 1:
Table 1
| Pin | Function |
| IDIn(n＝0～15) | Isolate the numeral input |
| IDOn(n＝0～15) | Isolate numeral output |
| EXCOM | Isolate digital quantity input ground |
| EGND | Isolate digital quantity output ground |
| PCOM | Digital quantity output protection diode |
(3) electrode power supply circuit: the conductivity of liquid is to utilize the potential electrode insertion detected solution of band alternating electric field to measure, to reach the effect that reduces to polarize.By experiment, select for use 1000Hz can reach precision preferably.The symmetry of the pulse signal of AC signal source generation simultaneously has very big influence to the precision of measuring.It is consistent that the amplitude of general positive negative pulse stuffing is wanted, and dutycycle is 50%.So just can make the equivalent current that flows through solution is 0, does not change the character of solution and reduce ionization in measuring process.
The electrode power supply circuit uses integrated circuit CD4046, and its inside mainly is made up of phase comparator (PC), voltage controlled oscillator (VCO).Utilize its outstanding VCO circuit, be built into stable height, the oscillator of dutycycle 50%, the control signal of output 1000Hz is given the CD4053 control end.Using CD4053 to realize the timesharing gate voltage, is that 50% square-wave pulse is supplied with electrode at the output terminal output duty cycle of CD4053.The schematic diagram of electrode power supply circuit as shown in Figure 8.
With reference to Fig. 8, ± 8V power supply is provided by integrated voltage stabilizer IC7808 and 7908, has very strong carrying load ability, at external pull-up resistor when not being very little (〉=5 Ω), and voltage constant ± 8V, it is very little to fluctuate.Subsequent conditioning circuit is made up of pair of diodes (conduction voltage drop is 0.7V), a pair of stabilivolt (Vz=5V).When CD4053 is output as high level pulse, the right wing conducting among the last figure, end on left road, when CD4053 is output as low level pulse, the conducting of left road, and right wing ends.No matter that road conducting, the knot pressure drop of diode and the voltage stabilizing of stabilivolt can guarantee the constant voltage of 0.7V+5V=5.7V.The square-wave voltage that will occur like this, the 5.7V of alternation on the conductance cell.Experimental results show that symmetry is fine.
(4) signal sample circuit: signal sample circuit is made up of sampling resistor loop, phase-sensitive detection circuit, noise reduction filtering circuit.The circuit theory diagrams of signal sample circuit as shown in Figure 9.
Because the voltage division signal that obtains on the sampling resistor is double polarity pulse signal, the A/D input reference signal that EPC-2901 provides is that 0～2.5V is unipolar, so need convert AC signal to direct current signal.The common phase-sensitive detection circuit of being made up of commutation diode is because of the existence of diode junction pressure drop (0.7V), can not be by little voltage division signal, influence measuring accuracy and dynamic range, for improving these performances, selected a kind of phase-sensitive detection circuit of being formed by integrated operational amplifier and on-off circuit for use.
For the precision that makes phase-sensitive detection circuit improves, temperature is floated and reduced, improve the linearity and the symmetry of this circuit, the circuit elements device has been done meticulous selecting.Amplifier F1, the F2 that phase-sensitive detection circuit uses adopted high precision, low-power consumption, low drift, wide voltage, instrument amplifier AD620 cheaply, and AD620 has the low input noise of 9nV/ √ Hz when 1kHz.F1 forms in-phase amplifier, and F2 forms inverting amplifier.Two amplifiers carry out same, anti-phase unit to input signal respectively and amplify, and obtaining at output terminal is that two amplitudes, frequency are identical, the voltage signal that the phase phasic difference is 180 °.The simulant electronic switch 4053 of back under synchronizing signal (1000Hz) control, two dephased signals of timesharing gating.When synchronizing signal is i1, during the semiperiod (high level), the preceding semiperiod (high level) of 4053 output in-phase signals, when synchronizing signal is negative half-cycle (low level), 4053 output later half cycles of in-phase signal (high level).Like this, obtain the direct current signal that detection goes out at 4053 output terminal.
Disturb because the direct current signals of 4053 outputs are mingled with power noise and circuit, added one-level noise reduction filtering circuit again at 4053 output terminal for this reason, element uses high precision, low-power consumption, the general amplifier of TL062 can satisfy the measuring accuracy requirement cheaply.
(5) electrode commutation circuit: electrode commutation circuit schematic diagram as shown in figure 10, this circuit is mainly twoly closed relay and forms by 30 two opening, and controls 30 conductance electrodes of 30 relays timesharing break-make in order by MiniISA-8032A.Relay is selected small solid relay AGN200A4H stable and reliable for performance for use, have volume little, in light weight (the super light-type of 0.7G), low-power consumption (＜100mw), high sensitivity, the high pressure resistant AC1 of coil contact, 500V, and shock-resistant voltage 1.5KV.
2, cable and electrode
Cable uses 68 core signal shielding cables.Electrode uses the online two electric pole type platinum electrodes of industry, is made up of 30 conductance electrodes.The waterproof sealing of 30 conductance electrodes and stube cable is extremely important, considers reason such as pressure, corrosion under water, joint adopt soak insullac, the modes such as silica gel, high pressure adhesive tape and insulating tape winding of irritating have done a large amount of experiments, in the hope of reaching the water-tight corrosion-proof requirement.Electrode and polycore cable are linked in sequence the most at last, form the distributed measurement electrode.Electrode separation is one meter (can determine to use number of poles and electrode separation according to the monitor well actual conditions), and sequence number is respectively 1 to 30 from top to bottom, and maximum measurement range of control is 29 meters.
Embodiment two
The flow process of a kind of seawater intrusion monitoring method of the embodiment of the invention may further comprise the steps as shown in figure 11:
Step s1 lays main frame and distributed measurement electrode.Main frame is laid near the safe part geologic hazard body, the distributed measurement electrode is laid in the geologic hazard body seawater intrusion inspection well, and records the well depth at each electrode place; Described distributed measurement electrode in axial direction distributes perpendicular to ground in described inspection well.
Step s2 selects test electrode, and gives selected electrifying electrodes, makes described electrode form the loop by well liquid, measures the voltage that is connected on the sampling resistor two ends in the described loop.Adopting frequency in the present embodiment is that amplitude unanimity, the dutycycle of 1000Hz, positive negative pulse stuffing is that 50% square-wave pulse is given selected electrifying electrodes.
Step s3 obtains the conductivity values of described electrode place well liquid according to described voltage.In the present embodiment, according to formula
Calculate the conductivity values of described electrode place well liquid; Wherein Kx is conductivity values, and Q is the electrode coefficient, V
AbBe the magnitude of voltage of described square-wave pulse, R2 is the resistance value of sampling resistor, and Vm is the magnitude of voltage at sampling resistor two ends, and R0 is the resistance value of cable between described main frame and the distributed measurement electrode, and R1 is the resistance value of divider resistance.
Wherein, during conductivity measurement, adopt the low pulse voltage power supply, can ignore the influence of (conductance cell) distribution of electrodes electric capacity.The Conductivity Calculation equivalent circuit diagram as shown in figure 12.Wherein, Rx is the resistance of fluid to be measured, is drawn by Ohm law
V
ab＝(Vm/R2)*(Rx+R0+R1+R2)，
Be Rx=(Vab*R2)/Vm-(R0+R1+R2).
Because the conductivity of fluid to be measured is Kx=Q/Rx, so draw
In the present embodiment, select electrode coefficient Q=10 (cm for use
-1), V
Ab=5.7V is 64 Ω with multimeter measure R 0, R1=100 Ω, R2=126 Ω.
Therefore, the Conductivity Calculation formula is:
Kx=10/ (718-290*Vm)------unit: S/cm (Vm unit is volt);
Conductivity measurement scope because of distributed conductivity geologic hazard monitoring device design of the present invention is 0.5-60 (mS/cm) again, and final Conductivity Calculation formula is:
Kx＝10000/(718-290*Vm)
Wherein, the unit of Vm is V, and the unit of Kx is mS/cm.
Step s4 according to the well depth at described conductivity values and described electrode place, determines the boundary situation of degree of saltiness water, realizes the monitoring to the seawater intrusion situation.
Embodiment three
The on-the-spot scheme of installation of distributed conductivity geologic hazard monitoring device of the present invention as shown in figure 13, main frame, accumulator, cable are put into the other rack of observation port, and the distributed measurement electrode is put into the following suitable position of water level (being advisable with convenient observation conductivity variations).
Distributed conductivity geologic hazard monitoring device of the present invention in Bei Dai River, some areas of Nan Daihe install and use, and have reached good effect, the actual measured results to this area describes below.
1. table 2 is Beidaihe Beach shrimp-cultivation pool H15 observation port test data, and this wellhole is 20 meters deeply, and water level is 0 meter, fathoms 19 meters.Figure 14 is H15 observation port " well depth-conductivity curve " figure that draws according to the test data table.
Table 2
2. table 3 is holiday village north, gold bay, Bei Dai River 20 observation port test datas, and this wellhole is 23 meters deeply, 3 meters of water levels, and 3--22 rice fathoms.Figure 15 is north 20 observation ports " well depth-conductivity curve " figure that draws according to the test data table.
Table 3
3. table 4 is worn motor-pumped well room, He Nanmeng village observation port test data for south, and this wellhole is 80 meters deeply, and 5 meters of water levels, the 6--75 rice that fathoms, Figure 16 are Nan Meng village observation port " well depth-conductivity curve " figure that draws according to the test data table.
Table 4
The present invention is by the collection to the conductivity values of the well liquid of different depth in the geologic hazard body seawater intrusion inspection well everywhere, utilize electrical conductivity of water and salt content linear, well depth according to conductivity values and electrode place, be specified to the boundary situation of fresh water, the convenient, fast and accurate monitoring of finishing the seawater intrusion situation.Test data accuracy height of the present invention is convenient to be utilized by ground calamity monitoring net.The present invention mainly has following characteristics:
1, system works is reliable: the electronic component of distributed conductivity geologic hazard monitor is according to the technical grade Standard Selection, and circuit board is followed under the principle of EMC and designed, and can guarantee the reliability of system's operate as normal and work.
2, applied widely: distributed conductivity geologic hazard monitor can be measured the conductivity of satisfactory other occasions.
3, the monitoring electrode is many: the distributed measurement electrode of distributed conductivity geologic hazard monitor can reach 30 electrodes at most according to the customer demand configuration.
4, monitoring range is big: maximum 1 meter of distributed measurement electrode pole span, can in 29 meters scopes, monitor the variation of conductivity.
5, data acquisition time is set flexibly: distributed conductivity geologic hazard monitor, data acquisition time can be assigned to 24 hours from 5 and arbitrarily set.
6, measurement data accuracy height: because conductivity measurement is to carry out under static state for a long time, the measurement data error of having avoided artificial in-site measurement to cause because of the artificial disturbance water body.
7, curve intuitive display: distributed conductivity geologic hazard monitor data processing software can carry out order with several days, " well depth-conductivity " curve in a few week, several months or a year to be arranged, and conductivity situation over time comes into plain view.
8, the loss of power is little: adopt regularly break-make power supply, reduce the loss of power, instrument can be worked under unattended situation the longer time.
9, power supply variation: distributed conductivity geologic hazard monitor is selected the power supply of 12V power supply for use, can adopt solar panel or 220V to exchange commentaries on classics 12V direct current mode and power.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a distributed conductivity geologic hazard monitoring device is characterized in that described device comprises main frame and a plurality of electrode, is connected by cable between described main frame and the electrode;
Described main frame is laid near the safe part of geologic hazard body, comprising:
Electrode is selected circuit, is used for selecting test electrode to be switched on;
The electrode power supply circuit is used for giving the electrifying electrodes of selecting; It is 50% square-wave pulse that described electrode power supply circuit is output as amplitude unanimity, dutycycle that frequency is 1000Hz, positive negative pulse stuffing;
The electrode commutation circuit is used for the selection result according to described electrode selection circuit, the electrode of selecting is switched to the electrode power supply circuit switch on;
Signal sample circuit is used for signals collecting is carried out in the loop that well liquid between electrode power supply circuit, electrode and electrode after the energising forms;
Main control unit and data acquisition circuit are used for control and finish electrode selection, electrode switching, data acquisition process and storage;
Described electrode is laid in the geologic hazard body seawater intrusion inspection well everywhere, in axial direction distributes perpendicular to ground in described inspection well;
Described signal sample circuit is made up of sampling resistor loop, phase-sensitive detection circuit, noise reduction filtering circuit, forms phase-sensitive detection circuit by integrated operational amplifier and on-off circuit; In the phase-sensitive detection circuit, first operational amplifier (F1) is formed in-phase amplifier, second operational amplifier (F2) is formed inverting amplifier, two amplifiers carry out same, anti-phase unit to input signal respectively and amplify, obtaining at output terminal is that two amplitudes, frequency are identical, the voltage signal that the phase phasic difference is 180 °, wherein said input signal are the magnitude of voltage at the sampling resistor two ends in the sampling resistor loop; Simulant electronic switch is under synchronizing signal control, and described two the dephased signals of timesharing gating obtain the direct current signal that detection goes out at the output terminal of simulant electronic switch.
2. distributed conductivity geologic hazard monitoring device as claimed in claim 1 is characterized in that described main control unit and data acquisition circuit comprise:
The conductivity acquiring unit is used for according to formula
Calculate the conductivity values of described electrode place well liquid; Wherein Kx is conductivity values, and Q is the electrode coefficient, V
AbBe the magnitude of voltage of described square-wave pulse, R2 is the resistance value of sampling resistor, and Vm is the magnitude of voltage at sampling resistor two ends, and R0 is the resistance value of the cable between described main frame and the electrode, and R1 is the resistance value of divider resistance;
The boundary determining unit is used for the well depth according to described conductivity values and described electrode place, is specified to the boundary situation of fresh water.
3. distributed conductivity geologic hazard monitoring device as claimed in claim 2 is characterized in that described main frame also comprises storer, is used for the status information of the electrode of the described conductivity values of storage and correspondence.
4. as each described distributed conductivity geologic hazard monitoring device of claim 1 to 3, it is characterized in that described electrode is 2 to 30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110009794 CN102141534B (en) | 2011-01-18 | 2011-01-18 | Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110009794 CN102141534B (en) | 2011-01-18 | 2011-01-18 | Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102141534A CN102141534A (en) | 2011-08-03 |
| CN102141534B true CN102141534B (en) | 2013-09-04 |
Family
ID=44409202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110009794 Expired - Fee Related CN102141534B (en) | 2011-01-18 | 2011-01-18 | Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102141534B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330422B (en) * | 2014-07-18 | 2017-01-18 | 广州市地质调查院 | Method for discriminating seawater intrusion through micro-particle analysis |
| CN105259366B (en) * | 2015-10-30 | 2018-07-17 | 武汉工程大学 | A kind of measuring device and method of seepage velocity |
| CN107091861A (en) * | 2017-06-14 | 2017-08-25 | 黑龙江省水利科学研究院 | A kind of device and method for measuring different depth water body resistivity under water |
| CN111537569A (en) * | 2020-05-24 | 2020-08-14 | 哈尔滨理工大学 | Distributed water conductivity detection circuit and key module thereof |
| CN112459041B (en) * | 2020-11-09 | 2023-03-28 | 上海长凯岩土工程有限公司 | Intelligent control system for groundwater recharge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2141549A (en) * | 1983-05-31 | 1984-12-19 | Gearhart Ind Inc | Method and apparatus for exploration of geological formations in boreholes |
| CN1305088A (en) * | 1999-12-14 | 2001-07-25 | 大地公司 | Method of monitoring the diameter for cylindrical body made by injection process |
| CN2459657Y (en) * | 2000-07-10 | 2001-11-14 | 西安佳源技术贸易发展有限责任公司 | Salinometer |
| JP2006091018A (en) * | 2004-08-27 | 2006-04-06 | Newjec Inc | Method for understanding and examining shape of interface between salt water and fresh water |
| CN101135705A (en) * | 2006-08-30 | 2008-03-05 | 梅特勒-托利多仪器（上海）有限公司 | Measurement method of solution electric conductivity |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20051073A0 (en) * | 2005-10-24 | 2005-10-24 | Geol Tutkimuskeskus Gtk | Measuring device and method for characterizing the quality of a flotation bed and its internal weather conditions by measuring the conductivity of both the foam and the liquid / sludge thereof |
-
2011
- 2011-01-18 CN CN 201110009794 patent/CN102141534B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2141549A (en) * | 1983-05-31 | 1984-12-19 | Gearhart Ind Inc | Method and apparatus for exploration of geological formations in boreholes |
| CN1305088A (en) * | 1999-12-14 | 2001-07-25 | 大地公司 | Method of monitoring the diameter for cylindrical body made by injection process |
| CN2459657Y (en) * | 2000-07-10 | 2001-11-14 | 西安佳源技术贸易发展有限责任公司 | Salinometer |
| JP2006091018A (en) * | 2004-08-27 | 2006-04-06 | Newjec Inc | Method for understanding and examining shape of interface between salt water and fresh water |
| CN101135705A (en) * | 2006-08-30 | 2008-03-05 | 梅特勒-托利多仪器（上海）有限公司 | Measurement method of solution electric conductivity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102141534A (en) | 2011-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102141534B (en) | Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device | |
| Schmidt-Hattenberger et al. | Application of a Vertical Electrical Resistivity Array (VERA) for monitoring CO2 migration at the Ketzin site: First performance evaluation | |
| CN104713904B (en) | The calculation method of a kind of seabed in-situ heat conductance | |
| CN102236106B (en) | Method and device for measuring resistivity of underground medium on ground and in gallery in quasi-three-dimension mode | |
| US9880312B2 (en) | Intelligent spectral induced polarization measurement module | |
| CN102262173A (en) | Method for measuring buried depth of buried pipeline, size and direction of stray current and geomagnetic azimuth angle | |
| CN104793249B (en) | A kind of method of system detection seawater invasion | |
| CN102072925A (en) | Stroma moisture and conductivity in situ detector and method for determining salinity | |
| CN105259584A (en) | Water area electric prospecting system | |
| CN103941293A (en) | Dynamic electricity observing system for natural electric field | |
| CN104360402B (en) | Well-to-ground joint electrical-method testing method and system | |
| CN104459803B (en) | The natural field source electromagnetic measurement device of intelligent long period and its application method | |
| CN201974399U (en) | Matrix humidity and conductivity in-situ detector | |
| Gao et al. | Design of distributed three component seismic data acquisition system based on LoRa wireless communication technology | |
| CN109752768A (en) | The electric earth magnetism high density dot matrix measurement acquisition big data system in solar powered field ground | |
| CN201269903Y (en) | Stray current detecting device | |
| CN208207246U (en) | A kind of device for geophysical exploration | |
| CN103776760A (en) | Grounding network resistance reducing agent detecting device and system | |
| CN206248166U (en) | A kind of water-level measuring post of portable type measuring level of ground water | |
| CN204256187U (en) | Parallel electrical method test macro is combined on a kind of well ground | |
| CN102147483B (en) | Groundwater-recharge bipolar double-meter electric well logging method | |
| CN206756936U (en) | Electrodeless formula conductivity detector for salt water area | |
| CA2782353C (en) | A system for scanning of earth's self-potential field | |
| CN102692654B (en) | Pulse neutron well logging method and equipment for tight gas reservoir evaluation | |
| CN208270474U (en) | A kind of oxidation-reduction potential and temperature CONTINUOUS VISCOSITY MEASURING |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20160118 |
|
| EXPY | Termination of patent right or utility model |