System and method for monitoring seawater intrusion-ground water level-soil salinization in real time

A technology of seawater intrusion and groundwater level, applied in liquid level indicators for physical variable measurement, material resistance, etc., can solve the problems of poor applicability of ion chromatography, inability to perform real-time monitoring, and few researches on synchronous monitoring, so as to reduce monitoring cost effect

Active Publication Date: 2012-01-04
OCEAN UNIV OF CHINA
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Problems solved by technology

The remote sensing method has monitoring hysteresis and cannot perform real-time monitoring; the ion chromatography method has poor applicability and is only suitable for laboratory monit

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  • System and method for monitoring seawater intrusion-ground water level-soil salinization in real time
  • System and method for monitoring seawater intrusion-ground water level-soil salinization in real time
  • System and method for monitoring seawater intrusion-ground water level-soil salinization in real time

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Embodiment

[0065] Taking the Yellow River Delta as an example, there are widespread seawater intrusion, groundwater table, and soil salinization phenomena in this area. Firstly, carry out risk survey and assessment, and select as sample points. Sampling was carried out on site, and the resistivity of the soil was measured as 0.28Ω·m when it was saturated with seawater, 42.4Ω·m when it was saturated with fresh water, and 3.35Ω·m when the salinity was 0.3%. , the threshold for monitoring and early warning of groundwater level and soil salinization. According to the geological conditions of the sample point (the depth of the groundwater is about 0.8m, and the thickness of the aquifer is 1m), the length of the resistivity measuring device 9 is designed to be 2m. Prepare a circular cylindrical mold with an outer diameter of 50mm, an inner diameter of 40mm, and a height of 20mm, and cast nylon to form a nylon module 3, and forge a copper electrode ring 2 with an outer diameter of 51mm, an inn...

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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 asan 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 [0001] The invention relates to a system and method for real-time monitoring of seawater intrusion-ground water level-soil salinization, belonging to the field of natural disaster monitoring and early warning. Background technique [0002] Seawater intrusion is an environmental geological deterioration phenomenon in which seawater infiltrates underground freshwater layers due to the decline of land groundwater levels. During the process of seawater intrusion, salt accumulates to the soil surface through capillary force, which will cause soil salinization. When the groundwater table is relatively shallow, a large amount of water evaporates and causes salt to accumulate in the soil, which can also lead to soil salinization. The process of seawater intrusion and the process of soil salinization are often accompanied by changes in groundwater levels. The emergence and development of the three influence each other and are inseparable. Seawater intrusion and soi...

Claims

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Application Information

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IPC IPC(8): G01N27/04G01F23/24
Inventor 贾永刚付腾飞单红仙
Owner OCEAN UNIV OF CHINA
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