Department of Energy and Fuels, School of Mines and Energy, Universidad Politécnica de Madrid, C/Ríos Rosas 21, 28003 Madrid, Spain.
Ministerio de Ciencia e Innovación España, Paseo de la Castellana 162, 28046 Madrid, Spain.
Sensors (Basel). 2023 Jan 8;23(2):708. doi: 10.3390/s23020708.
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 salinized 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 analyzed subsurface media. Results were 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 in mid-autumn and one late winter (i.e., in October and February, respectively) are presented. The results reveal the position of the saline front during each campaign while reflecting the seasonal movement of the marine intrusion.
本研究介绍了时域激发极化法的发展，该方法作为在受海洋入侵影响的滨海碎屑含水层调查中电阻率测深的辅助工具。在存在低电阻率岩性（如粘土）的情况下，由于可变的水化学和岩性，对这些含水层的电阻率测量的解释存在不确定性。为了降低这些不确定性，需要使用其他地球物理参数；因此，本研究侧重于激发极化，因为它可以与电阻率同时测量。详细地，我们提出了使用一维技术确定激发极化，同时开发一种用于处理激发极化数据的不同算法。目的是利用衰减曲线中提取的极化率和衰减时间的概念来扩展这种现象的结果，因为它们代表了各种分析的地下介质的更内在的特性。通过在两个不同的时间段内将这种方法应用于伊比利亚半岛东南（阿尔梅里亚省）的科斯塔德尔索尔的第四纪含水层，得到了结果。结果展示了每个时间段内咸水前缘的位置，同时反映了海洋入侵的季节性移动。
