NDLI: Estimation of quantitative descriptors of northeastern Mediterranean karst behavior: multiparametric study and local validation of the Siou-Blanc massif (Toulon, France)

Content Provider	Springer Nature Link
Author	Binet, Stéphane Mudry, Jacques Bertrand, Catherine Guglielmi, Yves Cova, René
Copyright Year	2006
Abstract	Key parameters controlling the recharge and behavior of Mediterranean karsts were selected in order to make a quantitative description of northeastern Mediterranean karsts on a regional scale. The methodology was applied to an actual karstic aquifer on the Siou-Blanc Plateau (France). For the recharge study, it was observed that the average yearly rainfall value and δ$^{18}$O measurements in springs can be considered as good descriptors of climatic variations observed in the Mediterranean area. They can be used to estimate the intake area and the infiltration coefficient. A comparison with a numerical (double permeability) flow model (MODFLOW) on the Siou-Blanc karst improves these exponential relations between effective rainfall and δ$^{18}$O measurements. Infiltrated water, which flows though different rock types, induces contrasts in the water chemistry. An instantaneous physical and chemical analysis of all the springs of the Siou-Blanc aquifer displays the same expected functioning and variations as had been forecast using the conceptual scheme. Thus, it can be applied to wide areas associated with a northeastern Mediterranean climate for a first approach of a karst study; such a model enables a useful estimation of recharge and behavior with few simple data.Des paramètres clés qui contrôlent la recharge et le fonctionnement des karsts méditerranéens ont été sélectionnés, afin de proposer une description quantitative des karsts du Nord-Est de la Méditerranée, à l’échelle régionale. La méthodologie a été appliquée à l’aquifère karstique du plateau de Siou-Blanc (France). En ce qui concerne la recharge, la pluie moyenne annuelle et les mesures de δ$^{18}$O aux sources peuvent être considérées comme de bons descripteurs des variations climatiques observées en région méditerranéen. Ils peuvent être utilisés pour estimer le bassin d’infiltration et le coefficient d’infiltration sur les karsts méditerranéens. Une comparaison avec un modèle numérique (MODFLOW) d’écoulement (double perméabilité) sur le karst de Siou-Blanc confirme la relation exponentielle entre la pluie infiltrée et les mesures de δ$^{18}$O. L’eau infiltrée, qui s’écoule à travers différents types de roches, induit un contraste dans la chimie de l’eau aux sources. Une campagne d’analyses physiques et chimiques sur toutes les sources de l’aquifère de Siou-Blanc, présente la même variabilité et le même fonctionnement que ceux prévus par le modèle conceptuel. Ainsi, ce modèle peut-être appliqué pour une première approche d’un karst soumis au climat du Nord-Est de la méditerranée, et permet une estimation de la recharge et du fonctionnement de l’aquifère avec quelques données faciles à acquérir.Se seleccionaron parámetros importantes que controlan la recarga y el comportamiento de los karsts mediterráneos, con el fin de hacer una descripción cuantitativa de los karsts del Mediterráneo nor-oriental, a una escala regional. La metodología se aplicó a un acuífero cársico real en la Meseta de Siou-Blanc (Francia). Para el estudio de la recarga, se observó que el valor promedio de lluvia anual y las mediciones del δ$^{18}$O en manantiales pueden ser considerados como descriptores buenos de variaciones climáticas observadas en el área Mediterránea. Ellos pueden usarse para estimar el área de entrada y el coeficiente de infiltración. Una comparación con un modelo de flujo numérico—MODFLOW—(permeabilidad doble) en el karst de Siou-Blanc, mejora estas relaciones exponenciales entre la lluvia eficaz y las mediciones de δ$^{18}$O. El agua infiltrada, que fluye a través de tipos de roca diferentes, induce contrastes en la química del agua. Un análisis físico y químico instantáneo de todos los manantiales del acuífero de Siou-Blanc, muestra el mismo funcionamiento esperado y variaciones como había sido pronosticado mediante el uso del esquema conceptual. Así, puede aplicarse a áreas extensas asociadas con el clima mediterráneo nor-oriental, para un primer acercamiento a un estudio del karst; semejante modelo habilita una estimación útil de la recarga y del comportamiento, con unos pocos datos simples.
Starting Page	1107
Ending Page	1121
Page Count	15
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	14
Issue Number	7
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-15
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Karst Mediterranean climate Groundwater recharge Water chemistry Toulon Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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