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Article

Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography

1
Laboratory of Applied Geology and Hydrogeology, Department of Geology, Ghent University, Krijgslaan 281-S8, 9000 Ghent, Belgium
2
Vietnam Institute of Geosciences and Mineral Resources (VIGMR), Hanoi 100000, Vietnam
3
Urban and Environmental Engineering Research Unit, Liege University, Allée de la Découverte 9, 4000 Liège, Belgium
4
Department of Earth and Environmental Sciences-Geology, KU Leuven, Celestijnenlaan 200e-bus 2411, 3001 Leuven, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Eyal Shalev
Water 2021, 13(13), 1743; https://doi.org/10.3390/w13131743
Received: 19 May 2021 / Revised: 21 June 2021 / Accepted: 21 June 2021 / Published: 24 June 2021
(This article belongs to the Special Issue Seawater Intrusion into Coastal Aquifers)
With the growing population and the adverse effects of climate change, the pressure on coastal aquifers is increasing, leading to a larger risk of saltwater intrusion (SI). SI is often complex and difficult to characterize from well data only. In this context, electrical resistivity tomography (ERT) can provide high-resolution qualitative information on the lateral and vertical distribution of salinity. However, the quantitative interpretation of ERT remains difficult because of the uncertainty of petrophysical relationships, the limitations of inversion, and the heterogeneity of aquifers. In this contribution, we propose a methodology for the semiquantitative interpretation of ERT when colocated well data are not available. We first use existing wells to identify freshwater zones and characterize the resistivity response of clayey deposits. Then, we approximate the formation factor from water samples collected in the vicinity of ERT data to derive a resistivity threshold to interpret the saline boundary. We applied the methodology in the shallow aquifers of the Luy River in the Binh Thuan province, Vietnam, where water resources are under pressure due to agricultural, aquacultural, and industrial production. Twenty-one ERT profiles were collected and revealed a much larger intrusion zone, compared to the previous study. Saltwater is present in lowland areas of the left bank over almost the whole thickness of the aquifer, while the right bank is constituted of sand dunes that are filled with freshwater. At a larger distance from the sea, a complex distribution between fresh and saltwater is observed. Our methodology could be applied to other heterogeneous aquifers in the absence of a dense monitoring network. View Full-Text
Keywords: saltwater intrusion; aquifer; resistivity; salinity; geophysics saltwater intrusion; aquifer; resistivity; salinity; geophysics
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MDPI and ACS Style

Cong-Thi, D.; Dieu, L.P.; Thibaut, R.; Paepen, M.; Ho, H.H.; Nguyen, F.; Hermans, T. Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography. Water 2021, 13, 1743. https://doi.org/10.3390/w13131743

AMA Style

Cong-Thi D, Dieu LP, Thibaut R, Paepen M, Ho HH, Nguyen F, Hermans T. Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography. Water. 2021; 13(13):1743. https://doi.org/10.3390/w13131743

Chicago/Turabian Style

Cong-Thi, Diep, Linh P. Dieu, Robin Thibaut, Marieke Paepen, Huu H. Ho, Frédéric Nguyen, and Thomas Hermans. 2021. "Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography" Water 13, no. 13: 1743. https://doi.org/10.3390/w13131743

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