音频大地电磁法在广西北海市海水入侵调查中的应用

doi:10.11720/wtyht.2020.2300

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Abstract

Seawater intrusion is one of the problems facing coastal countries and regions, and is also one of the major geological disasters in the Beibu Gulf economic zone. In this paper, based on systematic research on previous researches on Beibu Gulf region of Guangxi and using EH-4 audio magnetotelluric method int Beihai City, the authors made a preliminary study of the present situation of seawater intrusion, salty-fresh water dividing, and features of water-containing strata in the study area. It can be seen that, through the coastal city environmental geological survey work and by using reasonable geophysical detection methods and taking the preventive measures, the problem of seawater intrusion in coastal areas can be solved effectively. The authors' work has also confirmed that the EH-4 audio magnetotelluric method has a good effect in the investigation of seawater intrusion in the research area, and hence deserves wide application.

Key words： AMT saltwater intrusion salt-fresh water dividing environmental geological survey

Received: 14 August 2018 Published: 03 March 2020

P631

Corresponding Authors: Hai-Long LI E-mail: 252296049@qq.com

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	Xiao-Yi OU
	Hai-Long LI
	Fu-Qiang YANG
	Ya-Jun MO
	Huai-Cheng LU

Cite this article:

Xiao-Yi OU,Hai-Long LI,Fu-Qiang YANG, et al. A preliminary study of the application of audio magnetotelluric method to the investigation of seawater intrusion in Beihai City, Guangxi[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 66-73.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.2300 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/66

Distribution of the seawater invasion and mariculture in Beihai city(according the literature [6])
1—the absence range of bedrock uplift confined aquifer;2—seawater intrusion region;3—mariculture causes the salinity of groundwater;4—source boundary;5—well in phreatic aquifer;6—confined water well;7—drill

Conceptual model of the sea water intrusion in Beihai city
1—the artesian head line; 2—fresh water transition zone peak line

Curve of resistivity and chlorideion content

Resistivity and chlorine ion content distribution curve

The resistivity-total solution ion regression analysis chart of northern sea water

Water salinity-resistivity statistical of Beihai

Profile of 320-line comprehensive results

Schematic diagram of finite element 2-D forward modeling mesh subdivision

The section contour map of calculated by finite element forward modeling

Geographical location traffic map of the study area

Sounding chart of single point

Infer and interpret the comprehensive result diagram of profile AMT

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