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Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device

A technology for seawater intrusion and geological disasters, applied in the direction of material resistance, etc., can solve the problems of heavy workload, poor data processing accuracy, and cumbersome process, and achieve the effect of high accuracy

Inactive Publication Date: 2011-08-03
CENT FOR HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is to provide a seawater intrusion monitoring method and a distributed conductivity geological disaster monitoring device to overcome the defects of large workload, cumbersome process and poor data processing accuracy in the prior art when implementing seawater intrusion monitoring

Method used

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  • Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device
  • Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device
  • Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The schematic diagram of the host circuit image 3 As shown, the host is arranged in a safe place near the geological disaster body, including:

[0059] The electrode selection circuit is used to select the test electrode to be energized;

[0060] The electrode power supply circuit is used to energize the selected electrode, and the output of the electrode power supply circuit is a square wave pulse with a frequency of 1000 Hz, positive and negative pulses with the same amplitude, and a duty cycle of 50%;

[0061] The electrode switching circuit is used to switch the selected electrode to the electrode power supply circuit for power supply according to the selection result of the electrode selection circuit;

[0062] The signal sampling circuit is used to collect signals from the electrode power supply circuit after power-on and the circuit formed by the well fluid between the electrodes and the electrodes;

[0063] The memory is used to store the conductivity value a...

Embodiment 2

[0097] Step s1, deploying the host computer and distributed measurement electrodes. Arrange the host in a safe place near the geological disaster body, arrange the distributed measurement electrodes in the seawater intrusion observation well of the geological disaster body, and record the well depth where each electrode is located; the distributed measurement electrodes are perpendicular to the ground in the observation well Distributed along the axial direction.

[0098] Step s2, select the test electrode, and energize the selected electrode, so that the electrode forms a loop through the well fluid, and measure the voltage across the sampling resistor connected in series in the loop. In this embodiment, a square wave pulse with a frequency of 1000 Hz, positive and negative pulses with the same amplitude, and a duty ratio of 50% is used to energize the selected electrodes.

[0099] Step s3, obtaining the conductivity value of the well fluid at the electrode according to the ...

Embodiment 3

[0116] The distributed electrical conductivity geological disaster monitoring device of the present invention has been installed and used in some areas of Beidaihe and Nandaihe, and has achieved good results. The actual measurement results in this area will be described below.

[0117] 1. Table 2 shows the test data of the H15 observation hole in the Beidaihe seaside shrimp pond. The depth of the well is 20 meters, the water level is 0 meters, and the measured depth is 19 meters. Figure 14 It is the "well depth-conductivity curve" diagram of H15 observation hole drawn according to the test data table.

[0118] Table 2

[0119]

[0120] 2. Table 3 shows the test data of Beidaihe Jinhaiwan Resort North 20 observation hole. The depth of the hole is 23 meters, the water level is 3 meters, and the measured depth is 3-22 meters. Figure 15 It is the "well depth-conductivity curve" diagram of Bei 20 observation hole drawn according to the test data table.

[0121] table 3

[0...

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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 [0001] The invention relates to the technical field of geological disaster monitoring, in particular to a seawater intrusion monitoring method and a distributed electrical conductivity geological disaster monitoring device. Background technique [0002] Seawater intrusion is a natural phenomenon in which seawater intrusion infects underground freshwater layers due to the decline of land groundwater levels. That is to say, seawater infiltrates into the terrestrial fresh aquifer with a lower water table through the aquifer (including the aquitard). Under normal circumstances, the water level of fresh land aquifers is higher than that of seawater, but after long-term large-scale pumping of fresh land aquifers, the groundwater level will be lower than that of seawater, causing seawater (salt water) to infiltrate into fresh land aquifers through the permeable layer , thereby destroying groundwater resources. [0003] According to data, in recent years, seawater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/06
Inventor 曹修定殷跃平杨进平吴悦任晨虹
Owner CENT FOR HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CGS
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