globalchange  > 气候变化与战略
DOI: 10.5194/hess-24-2121-2020
论文题名:
Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer
作者: 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.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期:4
起始页码: 2121
结束页码: 2139
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162712
Appears in Collections:气候变化与战略

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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, Barcelona, 08028, Spain; Queralt, P., Geomodels Research Institute, University of Barcelona, Barcelona, 08028, Spain; A. Pezard, P., Geosciences Montpellier Laboratory, UMR 5243, Montpellier, 34090, France; Martínez, L., Institute of Environmental Assessment and Water Research (IDAEA), Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, 08034, Spain, Associated Unit: Hydrogeology Group (UPC-CSIC), Barcelona, Spain; Del Val, L., Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia (UPC-BarcelonaTech), Barcelona, 08034, Spain, Associated Unit: Hydrogeology Group (UPC-CSIC), Barcelona, Spain; Bosch, D., Geomodels Research Institute, University of Barcelona, Barcelona, 08028, Spain; Carrera, J., Institute of Environmental Assessment and Water Research (IDAEA), Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, 08034, Spain, Associated Unit: Hydrogeology Group (UPC-CSIC), Barcelona, Spain

Recommended Citation:
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]. Hydrology and Earth System Sciences,2020-01-01,24(4)
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