Assessment of seawater intrusion using geophysical well logging and electrical soundings in a coastal aquifer, Youngkwang-gun, Korea

Hwang, Soonwook; Shin, Jehyun; Park, In-Hwa; Lee, Sangkyu

doi:10.1071/eg04099

Cited by 31 publications

(19 citation statements)

References 7 publications

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“…Consequently it has find major usage in the delineation of freshwater from saltwater in same aquifer and environmental investigation. The electrical resistivity methods including vertical electrical sounding and resistivity profiling, as well as small loop electromagnetic survey are veritable tools for the delineation of saltwater intrusion in coastal aquifers (Hwang et al, 2004;Sherif et al, 2006;and Song, 2006;Atakpo, 2012;Adepelumi et al, 2008;. Oyedele 2001;Amadi et al, 2012;Nwankwoala and Munguye, 2013) Resistivity profiling can be used to obtain 2D and 3D subsurface geologic information.…”

mentioning

confidence: 99%

Saltwater Intrusion Appraisal of Shallow Aquifer in Burutu Area of the Western Niger Delta with 2D Electrical Resistivity Tomography

Ohwoghere‐Asuma¹,

Chinyem²,

Essi³

2017

Journal of Applied Sciences and Environmental Management

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ABSTRACT:The area is faced with endemic groundwater quality problems arising from abandoned shallow and deep boreholes. The abandonment of shallow boreholes is presumed to have been caused by saltwater intrusion from the ocean. The objective of this paper is to examine if saltwater is responsible for groundwater degradation associated with shallow groundwater aquifer. To achieve this, a multi-electrodes ABEM SAS 4000 Terrameter was used in the acquisition of 2D electrical resistivity tomography data. Inverse models which estimate actual subsurface geologic resistivity was generated from RES2DINV software and subsequently geologic information were construed from them. The interpretation of the various profiles returned resistivity values which contrasted the existence of saltwater in the pore spaces of groundwater aquifer media in the area under investigation. Resistivity images of values ranged from 2.34Ωm to 70 Ωm where interpreted as clays, greater than 70-90Ωm as fine sand and 90Ωm and above where interpret as medium sand. The evidence revealed by the 2D electrical resistivity tomography investigation combined with geochemistry of groundwater from literature suggested that abandonment of shallow boreholes are probably not related to saltwater intrusion. The study has established that poor groundwater quality being experienced is not caused by saltwater intrusion rather by iron which cannot be separately distinguished from groundwater by resistivity technique. © JASEM https://dx.doi.org/10.4314/jasem.v21i2.19

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confidence: 99%

Saltwater Intrusion Appraisal of Shallow Aquifer in Burutu Area of the Western Niger Delta with 2D Electrical Resistivity Tomography

Ohwoghere‐Asuma¹,

Chinyem²,

Essi³

2017

Journal of Applied Sciences and Environmental Management

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“…Schlumberger electrical soundings are usually designed to discriminate between electrical resistivities associated with lithological and/or hydrological characteristics (Hodlur et al, 2006). Their inherent capability is to detect changes in the electrical conductivity of the subsurface layers that reflect the fluid content of such layers (Hwang et al, 2004). In the last 10-15 years this method has been changed greatly, from traditional 1D models to 2D and 3D models for interpretation of heterogeneous media.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of DC, FDEM and IP resistivity methods for imaging perched saltwater and a shallow channel within coastal tidal flat sediments

Attwa

Günther

Grinat

et al. 2011

Journal of Applied Geophysics

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“…The borehole YK-12 is located in Baeksu-eup, Youngkwang-gun, on the western coast of Korea [2]. The borehole is drilled to evaluate the seawater intrusion.…”

Section: Field Experimetal Logmentioning

confidence: 99%

Correction of steel casing effect for density log using numerical and experimental methods in the slim borehole

Hwang¹,

Won²,

Shin³

et al. 2015

AIP Conference Proceedings

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Fast proximity effect correction method using a pattern area density map Abstract. Density log is widely applied for a variety of fields such as the petroleum exploration, mineral exploration, and geotechnical survey. The logging condition of density log is normally open holes but there are frequently cased boreholes. The primary calibration curve by slim hole logging manufacturer is normally the calibration curves for the variation of borehole diameter. In this study, we have performed the correction of steel casing effects using numerical and experimental methods. We have performed numerical modeling using the Monte Carlo N-Particle (MCNP) code based on Monte Carlo method, and field experimental method from open and cased hole log. In this study, we used the FDGS (Formation Density Gamma Sonde) for slim borehole with a 100 mCi 137Cs source, three inch borehole and steel casing. The casing effect between numerical and experimental method is well matched.

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Assessment of seawater intrusion using geophysical well logging and electrical soundings in a coastal aquifer, Youngkwang-gun, Korea

Cited by 31 publications

References 7 publications

Saltwater Intrusion Appraisal of Shallow Aquifer in Burutu Area of the Western Niger Delta with 2D Electrical Resistivity Tomography

Saltwater Intrusion Appraisal of Shallow Aquifer in Burutu Area of the Western Niger Delta with 2D Electrical Resistivity Tomography

Evaluation of DC, FDEM and IP resistivity methods for imaging perched saltwater and a shallow channel within coastal tidal flat sediments

Correction of steel casing effect for density log using numerical and experimental methods in the slim borehole

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