Modelling of the functioning of karst aquifers with a reservoir model: Application to Fontaine de Vaucluse (South of France)

Fleury, Perrine; Plagnes, Valérie; Bakalowicz, Michel

doi:10.1016/j.jhydrol.2007.07.014

Cited by 181 publications

(157 citation statements)

References 33 publications

(25 reference statements)

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“…Karst develops due to the dissolvability of carbonate rock (Ford and Williams, 2007) and it results in strong heterogeneity of subsurface flow and storage characteristics (Bakalowicz, 2005). The resulting complex hydrological behaviour requires adapted field investigation techniques (Goldscheider and Drew, 2007).…”

Section: Introductionmentioning

confidence: 99%

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

et al. 2016

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Abstract. Karst systems are important for drinking water supply. Future climate projections indicate increasing temperature and a higher frequency of strong weather events. Both will influence the availability and quality of water provided from karst regions. Forest disturbances such as windthrow can disrupt ecosystem cycles and cause pronounced nutrient losses from the ecosystems. In this study, we consider the time period before and after the wind disturbance period (2007/08) to identify impacts on DIN (dissolved inorganic nitrogen) and DOC (dissolved organic carbon) with a process-based flow and solute transport simulation model. When calibrated and validated before the disturbance, the model disregards the forest disturbance and its consequences on DIN and DOC production and leaching. It can therefore be used as a baseline for the undisturbed system and as a tool for the quantification of additional nutrient production. Our results indicate that the forest disturbance by windthrow results in a significant increase of DIN production lasting ∼ 3.7 years and exceeding the pre-disturbance average by 2.7 kg ha −1 a −1 corresponding to an increase of 53 %. There were no significant changes in DOC concentrations. With simulated transit time distributions we show that the impact on DIN travels through the hydrological system within some months. However, a small fraction of the system outflow (< 5 %) exceeds mean transit times of > 1 year.

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Section: Introductionmentioning

confidence: 99%

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

et al. 2016

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“…Reservoir models have been used effectively to simulate spring discharge and flow rate in combination with rainfall data. Several authors (Fleury et al, 2007;Fleury et al, 2008;Jukić and Denić-Jukić, 2009) applied reservoir models to karst-based systems. From knowledge of the overall behavior of karst aquifers, the composition of such models includes several connected reservoirs representing contributions of the saturated zone, the low-infiltration zone and the rapid-infiltration zone, respectively.…”

Section: Karst Modelingmentioning

confidence: 99%

“…The karst is considered as a system able to both transform an input (rainfall) into an output (discharge) and evaluate the input-output relation using mathematical functions. The systemic approach yields "black box" models based on deconvolutions, functions or machine learning techniques (Thiery et al, 1983;Karam, 1989;Fleury, 2005;Fleury et al, 2007). Such models offer satisfactory results when approximating overall karst system behavior (Larocque et al, 1998;Labat et al, 1999); furthermore, this approach may be conducted on any aquifer without specific system knowledge.…”

Section: Karst Modelingmentioning

confidence: 99%

Complexity selection of a neural network model for karst flood forecasting: The case of the Lez Basin (southern France)

Siou

Johannet

Estupina

et al. 2011

Journal of Hydrology

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A neural network model is applied to simulate the rainfall-runoff relation of a karst spring. The input selection for such a model becomes a major issue when deriving a parsimonious and efficient model. The present study is focused on these input selection methods; it begins by proposing two such methods and combines them in a subsequent step. The methods introduced are assessed for both simulation and forecasting purposes. Since rainfall is very difficult to forecast, especially in the study area, we have chosen a forecasting mode that does not require any rainfall forecast assumptions. This application has been implemented on the Lez karst aquifer, a highly complex basin due to its structure and operating conditions. Our models yield very good results, and the forecasted discharge values at the Lez spring are acceptable up to a 1-day forecasting horizon. The combined input selection method ultimately proves to be promising, by reducing input selection time while taking into account: i) the model's ability to accommodate nonlinearity, and ii) the forecasting horizon.

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“…They have been widely applied to investigate hydrogeological functioning of karst aquifers (e.g. Rimmer and Salingar, 2006;Fleury et al,2007b;Nikolaïdis et al, 2013;Tritz et al, 2011). Furthermore, such conceptual models were improved to simulate solute transport using mixing equations (Charlier et al, 2012;Hartmann, 2012a), showing the ability of lumped approaches to simulate water and mass balances as well as the fluxes dynamics.…”

Section: Introductionmentioning

confidence: 99%

Insights into saline intrusion and freshwater resources in coastal karstic aquifers using a lumped Rainfall–Discharge–Salinity model (the Port-Miou brackish spring, SE France)

Arfib

Charlier²

2016

Journal of Hydrology

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. Insights into saline intrusion and freshwater resources in coastal karstic aquifers using a lumped Rainfall-Discharge-Salinity model (the Port-Miou brackish spring, SE France). Journal of Hydrology, Elsevier, 2016, 540, pp.148-161. 10.1016/j.jhydrol.2016 Accepted Manuscript This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe aim of this study was to develop a conceptual model of saline intrusion within coastal karst aquifers by analyzing rainfall-discharge-salinity data and to assess freshwater resources using a lumped modeling approach. In a first step, we analyzed 4 years of data (rainfall, discharge and salinity times series) of the Port-Miou brackish submarine spring in South France (400 km²). A conceptual model of the aquifer was then designed to differentiate a deep brackish reservoir and a shallower fresh one. Salinity variations at the spring are assumed to be controlled mainly by dilution originating from the fresh water in the shallower reservoir. In a second step, a lumped modeling approach was developed based on the conceptual model to simulate discharge as well as salinity over time. We proposed a reservoir-model to take into account slow and fast components in the shallower part of the aquifer and a saline intrusion in the deeper one. This Rainfall-Discharge-Salinity model was calibrated and validated for two periods of 1.5 years at a daily time step and was also tested to reproduce a multi-annual evolution of the available discharge and salinity time series. Good simulation results were obtained to reproduce water and mass budgets as well as discharge and salinity dynamics 2 during several hydrological cycles. The simultaneous modeling of hydrodynamics and quality data showed the robustness of the model in addition to its easy implementation. Our results led us to propose a new type of seawater mixing mechanism for brackish springs: the dilution type, in addition to the well-known Ventury suction and Head balance types. The application of the lumped model on the Port-Miou brackish spring validated the hydrogeological processes deduced from experimental data, given an initial quantification of the freshwater resources available in such complex brackish karstic aquifers.

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Modelling of the functioning of karst aquifers with a reservoir model: Application to Fontaine de Vaucluse (South of France)

Cited by 181 publications

References 33 publications

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

Complexity selection of a neural network model for karst flood forecasting: The case of the Lez Basin (southern France)

Insights into saline intrusion and freshwater resources in coastal karstic aquifers using a lumped Rainfall–Discharge–Salinity model (the Port-Miou brackish spring, SE France)

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