气候变化领域集成服务门户(CCPortal): Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer

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DOI	10.5194/hess-24-2121-2020
	Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer
	Palacios A.; José Ledo J.; Linde N.; Luquot L.; Bellmunt F.; Folch A.; Marcuello A.; Queralt P.; A. Pezard P.; Martínez L.; Del Val L.; Bosch D.; Carrera J.
发表日期	2020
ISSN	1027-5606
起始页码	2121
结束页码	2139
卷号	24 期号:4
英文摘要	Surface electrical resistivity tomography (ERT) is a widely used tool to study seawater intrusion (SWI). It is noninvasive and offers a high spatial coverage at a low cost, but its imaging capabilities are strongly affected by decreasing resolution with depth. We conjecture that the use of CHERT (cross-hole ERT) can partly overcome these resolution limitations since the electrodes are placed at depth, which implies that the model resolution does not decrease at the depths of interest. The objective of this study is to test the CHERT for imaging the SWI and monitoring its dynamics at the Argentona site, a well-instrumented field site of a coastal alluvial aquifer located 40 km NE of Barcelona. To do so, we installed permanent electrodes around boreholes attached to the PVC pipes to perform time-lapse monitoring of the SWI on a transect perpendicular to the coastline. After 2 years of monitoring, we observe variability of SWI at different timescales: (1) natural seasonal variations and aquifer salinization that we attribute to long-term drought and (2) short-term fluctuations due to sea storms or flooding in the nearby stream during heavy rain events. The spatial imaging of bulk electrical conductivity allows us to explain non-monotonic salinity profiles in open boreholes (step-wise profiles really reflect the presence of freshwater at depth). By comparing CHERT results with traditional in situ measurements such as electrical conductivity of water samples and bulk electrical conductivity from induction logs, we conclude that CHERT is a reliable and cost-effective imaging tool for monitoring SWI dynamics. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	Aquifers; Boreholes; Cost effectiveness; Dynamics; Electric conductivity; Electrodes; Induction logging; Polyvinyl chlorides; Salt water intrusion; Seawater; Alluvial aquifers; Electrical conductivity; Electrical resistivity tomography; Heavy rain event; Imaging capabilities; In-situ measurement; Seasonal variation; Time-lapse monitoring; Electric variables measurement; coastal aquifer; electrical conductivity; flooding; freshwater; saline intrusion; salinity; seasonal variation; Barcelona
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159422
作者单位	Palacios, A., Institute of Environmental Assessment and Water Research (IDAEA), Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, 08034, Spain, Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia (UPC-BarcelonaTech), Barcelona, 08034, Spain, Associated Unit: Hydrogeology Group (UPC-CSIC), Barcelona, Spain; José Ledo, J., Geomodels Research Institute, University of Barcelona, Barcelona, 08028, Spain; Linde, N., Institute of Earth Sciences, University of Lausanne, Lausanne, 1015, Switzerland; Luquot, L., HydroScience Montpellier Laboratory, UMR 5569, Montpellier, 34090, France; Bellmunt, F., Cartographic and Geological Institute of Catalonia (ICGC), Barcelona, 08038, Spain; Folch, A., Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia (UPC-BarcelonaTech), Barcelona, 08034, Spain, Associated Unit: Hydrogeology Group (UPC-CSIC), Barcelona, Spain; Marcuello, A., Geomodels Research Institute, University of Barcelona, B...
推荐引用方式 GB/T 7714	Palacios A.,José Ledo J.,Linde N.,et al. Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer[J],2020,24(4).
APA	Palacios A..,José Ledo J..,Linde N..,Luquot L..,Bellmunt F..,...&Carrera J..(2020).Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer.Hydrology and Earth System Sciences,24(4).
MLA	Palacios A.,et al."Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer".Hydrology and Earth System Sciences 24.4(2020).