Use of trace and rare earth elements to quantify autogenic and allogenic inputs within a lowland karst network

Gill, Laurence; Babechuk, Michael G.; Kamber, Balz S.; McCormack, Ted; Murphy, Clodagh

doi:10.1016/j.apgeochem.2018.01.001

Cited by 27 publications

(22 citation statements)

References 47 publications

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“…On the other hand, those who contemplate this division in the modeling performance of water balance (e.g., Jukic & Denić‐Jukić, ) reached an acceptable estimation of the groundwater recharge components but only in aquifers clearly larger in size than the one exemplified here. Apart from lumped approaches, other methodologies broadly employed for evaluating the amounts of water derived from concentrated and diffuse recharge sources, such as the CV% of EC (White, ; Worthington et al, ) or conservative mixing equations (Binet et al, ; Doctor et al, ; Gill et al, ; Tobin & Schwartz, ), lead to rough estimations of the input components; water from different reservoirs usually does not have a uniform composition, and this can only be estimated approximately (Hunkeler & Mudry, ). All this reduces the reliability of the aforementioned methods, whose application should be restricted to a preliminary valuation of the recharge types.…”

Section: Discussionmentioning

confidence: 99%

Combining Experimental Methods and Modeling to Quantify the Complex Recharge Behavior of Karst Aquifers

Mudarra

Hartmann

Andreo

2019

Water Resources Research

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Integration of the abundant information derived from different sources, characterizing techniques and modeling methodologies, is crucial for extending our knowledge of karst aquifers and their available water resources. In this work, a numerically based approach derived from an improved version of the lumped VarKarst model is proposed, which jointly considers spring discharge and dye test results in calibration routine, to assess independently the contribution of the allogenic and autogenic components to the total recharge of a complex karst system with proved duality in its recharge mechanisms. A newly developed parameter estimation procedure based on rather soft performance rules is employed to confine the uncertainty of the water budget previously obtained with two other independent methods (Soil Water Balance and APLIS). Unlike other methodologies that lead to semiquantitative estimations of input sources, results from our approach display reliable ranges of calibrated values for recharge rate, recharge area, and, to a lesser extent, for water runoff infiltration coming from the streamflow. The integration of all these quantitative results with data (qualitative) previously derived from other experimental methodologies has meant a significant advance in understanding the behavior of the pilot system, allowing a more realistic and robust conceptual model to be developed. We conclude by emphasizing that a continuous transfer of improvements from conceptual to numerical modeling approaches, and vice versa, is necessary to enhance knowledge of carbonate aquifer functioning and ultimately achieve better evaluation and management of water resources. During this process, frequent mutual evaluation between the modeling approaches must be performed.

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Section: Discussionmentioning

confidence: 99%

Combining Experimental Methods and Modeling to Quantify the Complex Recharge Behavior of Karst Aquifers

Mudarra

Hartmann

Andreo

2019

Water Resources Research

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“…Boron isotopic ratios were measured with a Neptune+, Thermo Electron inductively coupled mass spectrometer at BRGM Laboratories for samples collected in 2010 (Guerrot et al, 2011) and at the AETE-ISO technical platform of the OSU OREME at University of Montpellier for the other samples. The average value determined for the NIST SRM 951 standard was 4.67 ± 0.0033.…”

Section: Geochemical and Isotopic Analysismentioning

confidence: 99%

Hydraulic and geochemical impact of occasional saltwater intrusions through a submarine spring in a karst and thermal aquifer (Balaruc peninsula near Montpellier, France)

Petre¹,

Ladouche

Seidel

et al. 2020

Hydrol. Earth Syst. Sci.

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Abstract. 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.

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“…The allogenic inflow contributes to the dissolution process introducing water that is undersaturated with respect to calcite [43,44]. Nevertheless, allogenic recharge should also be studied in respect to the diffuse recharge of karst aquifers [45,46] by using trace element analysis to distinguish allogenic runoff from karst waters. Future research in the karst system of Krania-Elassona should combine both hydrological modeling and hydrogeochemical analyses.…”

Section: Sarima Modelmentioning

confidence: 99%

Enhanced Characterization of the Krania–Elassona Structure and Functioning Allogenic Karst Aquifer in Central Greece

Manakos¹,

Ntona

Kazakis

et al. 2018

Geosciences

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The present study highlights the importance of geological, hydrogeological, and hydrogeochemical characterization of a karst aquifer in building a conceptual model of the system. The karst system of Krania–Elassona in central Greece was chosen for this application. Hydrogeological research included geological mapping and hydrogeological analysis. Additionally, hydrochemical analysis of water samples was performed in boreholes, rivers, and the system’s main spring. The Krania–Elassona aquifer consists of three horizons of marbles and is characterized by mature karstification. The karst aquifer is characterized by allogenic recharge mainly from the River Deskatis that accounts for up to 92% of the total flow. Groundwater and spring water are generally characterized as good quality and are suitable for irrigation and domestic use. The water type of the spring water is classified as Mg-HCO3. The application of a SARIMA (Seasonal Autoregressive Integrated Moving Average Model) model verified the conceptual model and successfully simulated spring discharge for a two-year period. The results of this study highlight the importance of basic hydrogeological research and the initial conceptualization of karst systems in reliably assessing groundwater vulnerability and modeling.

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Use of trace and rare earth elements to quantify autogenic and allogenic inputs within a lowland karst network

Cited by 27 publications

References 47 publications

Combining Experimental Methods and Modeling to Quantify the Complex Recharge Behavior of Karst Aquifers

Combining Experimental Methods and Modeling to Quantify the Complex Recharge Behavior of Karst Aquifers

Hydraulic and geochemical impact of occasional saltwater intrusions through a submarine spring in a karst and thermal aquifer (Balaruc peninsula near Montpellier, France)

Enhanced Characterization of the Krania–Elassona Structure and Functioning Allogenic Karst Aquifer in Central Greece

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