Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Different Processing of Time-domain-induced Polarisation: Application for Investigating the Marine Intrusion in the SE Iberian Peninsula

Version 1 : Received: 12 November 2022 / Approved: 16 November 2022 / Online: 16 November 2022 (02:34:59 CET)

A peer-reviewed article of this Preprint also exists.

Díaz-Curiel, J.; Biosca, B.; Arévalo-Lomas, L.; Miguel, M.J. A Different Processing of Time-Domain Induced Polarisation: Application for Investigating the Marine Intrusion in a Coastal Aquifer in the SE Iberian Peninsula. Sensors 2023, 23, 708. Díaz-Curiel, J.; Biosca, B.; Arévalo-Lomas, L.; Miguel, M.J. A Different Processing of Time-Domain Induced Polarisation: Application for Investigating the Marine Intrusion in a Coastal Aquifer in the SE Iberian Peninsula. Sensors 2023, 23, 708.

Abstract

This study presents the developments regarding the time-domain-induced polarisation method, as a supporting tool for resistivity soundings during investigations of coastal detrital aquifers that are salinised by marine intrusion. The interpretation of resistivity measurements in such aquifers, which have variable hydrochemistry and lithology, involves uncertainties owing to the presence of low-resistivity lithologies, such as clays. To reduce these uncertainties, the use of other geophysical parameters is necessary; hence, this study focuses on induced polarisation, since it can be measured simultaneously with resistivity. In detail, we propose the determination of induced polarisation using 1D techniques, while developing a different algorithm for processing the induced polarisation data. The aim is to extend the results of this phenomenon, using instead of chargeability, the concepts of polarisability and decay time, which are extracted from the decay curve, given that they represent more intrinsic properties of the various analysed subsurface media. We present results obtained by applying this methodology to a Quaternary aquifer of the Costa del Sol in the SE Iberian Peninsula (in the province of Almería) during two different campaigns, one before and one after winter (i.e., in October and February, respectively). The results reveal the position of the saline front during each campaign, while reflecting the seasonal movement of the marine intrusion.

Keywords

marine intrusion; induced polarisation; polarizability; decay time

Subject

Environmental and Earth Sciences, Geophysics and Geology

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