An in-situ automatic monitoring method and system for the range and degree of underground seawater intrusion

A seawater intrusion and automatic monitoring technology, applied in the field of underground exploration, can solve the problems of monitoring time and period limitations, large manpower and material resources, and inability to monitor seawater distribution, so as to avoid complicated work and improve accuracy.

Inactive Publication Date: 2011-12-21
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the monitoring well sampling detection method is time-consuming and laborious, and can only monitor the data of one point, and cannot monitor the distribution of seawater in the vertical direction of the point, and cannot achieve real-time continuous monitoring; while the existing geophysical methods all use ground equipment. Although this method can reflect the seawater intrusion on a certain macro scale, its disadvantages are that the monitoring requires a lot of manpower and material resources, and the monitoring time and cycle are limited, so it cannot realize continuous monitoring. Real-time monitoring, and the analysis of indirect data is often complicated due to the complexity of underground media

Method used

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  • An in-situ automatic monitoring method and system for the range and degree of underground seawater intrusion
  • An in-situ automatic monitoring method and system for the range and degree of underground seawater intrusion
  • An in-situ automatic monitoring method and system for the range and degree of underground seawater intrusion

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: Establish a standard curve between the seawater content and the resistivity value in the aqueous medium in the monitoring area

[0036] After fully cleaning the sand samples taken from Liuqinghe Beach in Qingdao, they were dried in a blast dryer at 105°C, and the dried sand samples were saturated according to the seawater / freshwater ratio listed in the table. Measure the resistivity value with the resistivity probe rod with the electrode ring spacing of 0.5cm, 1.0cm and 2.0cm, and convert the resistivity value into the conductivity value by taking the reciprocal of the resistivity value, and use the excel software to establish a standard curve, and perform numerical fitting to obtain the conductivity value (S / m) and seawater accounted for fresh water percentage (%) relationship. R according to the curve 2 The value selects the optimal electrode spacing. The conductivity of fresh water here is 0.02S / m, and that of pure seawater is 3.48S / m.

[0037] See T...

Embodiment 2

[0051] Embodiment 2: Using a resistivity probe rod with an electrode spacing of 2.0 cm to be used in an indoor simulated seawater intrusion experiment, the monitoring results are as follows:

[0052] Table 4 Indoor test monitoring results

[0053] Depth / cm

[0054] The monitoring results obtained from the indoor test show that at a depth of 80cm or more, the resistivity value is relatively large, and the degree of seawater mixing is low, which can be regarded as a freshwater area. In the transition zone, the resistivity value below 110cm is very small, which can be regarded as a seawater zone. It can be seen that due to buoyancy and other reasons, pure fresh water is on the top layer, the middle is a mixed layer of sea water and fresh water, and the bottom layer is a sea water layer. It can also be seen from the above table that the resistivity has a sudden change at around 25Ω·m, and this value can be used as the standard value of the seawater / fresh water boundary. ...

Embodiment 3

[0055] Embodiment 3 field actual observation

[0056] A site monitoring experiment was carried out at a point in the alluvial plain area of ​​the lower reaches of the Licun River. Firstly, soil columnar samples were taken for analysis, and the sampling depth was 10m. The analysis shows that the underground in this area is mainly fine sandy soil, mixed with medium-coarse sand at the upper 2-4m. The length of the resistivity probe rod is processed to 10m, the distance between the electrode rings is 2cm and buried in the drill hole, the remote control device is used to send signals to the resistivity probe rod and the data acquisition device, and the on-site resistivity acquisition is carried out after the probe rod receives the signal. The collected signal is preliminarily processed by the data processing device and transmitted to the data sending device, and the data sending device sends it to the data receiving and processing device through the wireless network. Afterwards, ...

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Abstract

The invention relates to an in-situ automatic monitoring method and system for the range and degree of underground seawater intrusion, comprising: 1) establishing a standard curve corresponding to the seawater content and conductivity value in the fresh water in the monitoring area; 2) determining the seawater/fresh water The resistivity value of the boundary line is used as the criterion for discrimination; 3) The resistivity value corresponding to each electrode point in the vertical direction is measured in situ by the resistivity probe rod, so as to determine the range and degree of seawater intrusion; and determine the position of the seawater/fresh water boundary line; The electrode spacing of the rate probe rod is 2.0 cm. The monitoring method of the present invention can automatically monitor the monitoring of underground seawater intrusion, avoiding the complicated work caused by manual intervention and intervention; through in-situ real-time resistivity monitoring, the resistivity data of underground water-bearing media can be provided in real time, and delineated The range of seawater intrusion and the degree of intrusion of the intrusion area determine the seawater/fresh water boundary, achieve long-term in-situ monitoring, and provide actual basic data for the prevention of seawater intrusion.

Description

technical field [0001] The invention belongs to the technical field of underground exploration, and in particular relates to an in-situ automatic monitoring method and system for the range and degree of underground seawater intrusion. Background technique [0002] With the development of industry and the increase of population, more and more coastal cities meet all or part of the city's water demand by exploiting groundwater. However, the overexploitation of groundwater has resulted in the pumping of water from subsurface aquifers faster than the aquifer's natural recharge rate. As a result, the water table in the aquifer has dropped, causing seawater intrusion into the aquifer, and causing serious damage to the city's drinking water supply capacity. long-term effects. [0003] Currently, monitoring technologies for seawater intrusion mainly include monitoring well sampling and detection methods, geophysical methods, etc. Among them, the monitoring well sampling detection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/06
Inventor 贾永刚赵战坤单红仙
Owner OCEAN UNIV OF CHINA
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