气候变化领域集成服务门户(CCPortal): Hydraulic and geochemical impact of occasional saltwater intrusions through a submarine spring in a karst and thermal aquifer (Balaruc peninsula near Montpellier; France)

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DOI	10.5194/hess-24-5655-2020
	Hydraulic and geochemical impact of occasional saltwater intrusions through a submarine spring in a karst and thermal aquifer (Balaruc peninsula near Montpellier; France)
	Petre M.-A.; Ladouche B.; Seidel J.-L.; Hemelsdaël R.; De Montety V.; Batiot-Guilhe C.; Lamotte C.
发表日期	2020
ISSN	1027-5606
起始页码	5655
结束页码	5672
卷号	24 期号:11
英文摘要	Submarine springs are a common discharge feature of the karst aquifers along the Mediterranean coast. In some instances, occasional and localized saltwater intrusions can occur through the submarine spring and negatively impact the quality of the groundwater resource. The hydraulic and geochemical behaviour of a submarine spring discharging into the Thau Lagoon just offshore of the Balaruc peninsula near Montpellier, France, has been characterized to determine the impacts of such phenomena to better understand the dynamics of a regional karst aquifer and improve its groundwater management. This work is based on both historical and new hydrogeological and geochemical data, illustrating six occasional saltwater intrusion events (from 1967 to 2014) in the Thau Lagoon area (southern France). Hydraulic perturbation of the aquifer is propagated instantly within the Balaruc-les-Bains peninsula and reaches a distance of about 5 km upgradient within 9 d. Comparison of hydraulic heads during seawater intrusion events in 2010 and 2014 indicates an aggravation of the phenomenon with an increase in hydraulic head variations. In contrast, isotopic tracers (87Sr=86Sr, D/H, 18O=16O) and rare earth elements (REEs) demonstrate that the geochemical impact of these inversac events is only observed at the local scale but is still perceptible several years after the event. For example, some of the thermal wells had not recovered their initial geochemical state 20 and 40 months after the last two inversac events (2010 and 2014, respectively), suggesting a geochemical legacy of this phenomenon within the complex karst system. By contrast, an adjacent deep karst compartment located south of the study area is not affected by the saltwater intrusion and is characterized by distinctly different hydrodynamic behaviour. Overall, this work on occasional and localized saltwater intrusions constitutes a key step in understanding the dynamics of this complex karstic and thermal aquifer and will support the management of the groundwater resource. © 2020 Author(s).
语种	英语
scopus关键词	Aquifers; Exploratory geochemistry; Groundwater resources; Hydrogeology; Landforms; Offshore oil well production; Rare earths; Salt water intrusion; Submarines; Tracers; Water management; Discharge features; Geochemical data; Groundwater management; Hydraulic heads; Hydrogeological; Mediterranean coasts; Rare earth elements (REEs); Thermal aquifers; Hydrochemistry; aquifer characterization; geochemical survey; hydraulic conductivity; karst hydrology; saline intrusion; salinity; spring (hydrology); water quality; France
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/159246
作者单位	Petre, M.-A., HydroSciences Montpellier, Montpellier University, CNRS, IRD, Montpellier, France, North Carolina State University, Marine, Earth, and Atmospheric Sciences Department, Raleigh, NC 27695, United States; Ladouche, B., BRGM, Montpellier University, Montpellier, France; Seidel, J.-L., HydroSciences Montpellier, Montpellier University, CNRS, IRD, Montpellier, France; Hemelsdaël, R., Geosciences Montpellier, Montpellier University, CNRS, Montpellier, France; De Montety, V., HydroSciences Montpellier, Montpellier University, CNRS, IRD, Montpellier, France; Batiot-Guilhe, C., HydroSciences Montpellier, Montpellier University, CNRS, IRD, Montpellier, France; Lamotte, C., BRGM, Montpellier University, Montpellier, France
推荐引用方式 GB/T 7714	Petre M.-A.,Ladouche B.,Seidel J.-L.,et al. Hydraulic and geochemical impact of occasional saltwater intrusions through a submarine spring in a karst and thermal aquifer (Balaruc peninsula near Montpellier; France)[J],2020,24(11).
APA	Petre M.-A..,Ladouche B..,Seidel J.-L..,Hemelsdaël R..,De Montety V..,...&Lamotte C..(2020).Hydraulic and geochemical impact of occasional saltwater intrusions through a submarine spring in a karst and thermal aquifer (Balaruc peninsula near Montpellier; France).Hydrology and Earth System Sciences,24(11).
MLA	Petre M.-A.,et al."Hydraulic and geochemical impact of occasional saltwater intrusions through a submarine spring in a karst and thermal aquifer (Balaruc peninsula near Montpellier; France)".Hydrology and Earth System Sciences 24.11(2020).