NDLI: Characterization of the Eva Verda basin aquifer (Saint Marcel, Aosta Valley, Italy) through geochemical and geostructural methods and analysis

Content Provider	Springer Nature Link
Author	Terrana, Silvia Gambillara, Roberto Scesi, Laura Martin, Silvana Ciceri, Elena
Copyright Year	2009
Abstract	The groundwater system of the Eva Verda basin (Saint Marcel Valley, southern side of the middle Aosta Valley, Italy) has many springs that can be used as sources for drinking water. This area is near the disused Servette mine, which can be a pollutant source (metals and sulfides) for the springs located downhill. Aquifer characterization was done using a multidisciplinary approach: geostructural, lithological, hydrogeological and geochemical. In particular, the geostructural analysis showed that the preferential water-flow direction is controlled by tectonics and that it has a trend along the slope toward the downhill springs. The mine drainage flow direction is in agreement with this trend and can pollute the springs. Chemical analysis revealed three water groups: (1) SO42-–Ca$^{2+}$–Mg$^{2+}$ rich water (mine drainage), (2) HCO3-–SO42-–Ca$^{2+}$ rich water and (3) HCO3-–Ca$^{2+}$ rich water (freshwater). The second group of water results from the different percentage mix between the first and the third waters. The low percentage of mine polluted water demonstrates that there is a high dilution and low pollution of waters that can be exploited for drinking.Le système hydrogéologique du basin versant d’Eva Verda (Vallée de Saint-Marcel, affluent méridional de la vallée moyenne d’Aoste, Italie) comprend tant de sources qu’elles sont utilisées pour l’alimentation en eau potable. Cette région est située à proximité de la mine désaffectée de la Servette, qui peut être à l’origine de contaminations (métaux et sulfates) pour les sources situées à l’aval. La caractérisation de l’aquifère a été réalisée selon une approche pluridisciplinaire : géologie structurale, lithologie, hydrogéologie et géochimie. L’analyse structurale a montré que les directions des écoulements préférentiels de l’eau est contrôlé par la tectonique et influence l’organisation des sources le long de la pente. La direction de l’écoulement issu du drainage minier est en cohérence avec cette organisation et peut ainsi contaminer les sources. Les analyses chimiques mettent en évidence trois familles distinctes: (1) eau riche en SO42-–Ca$^{2+}$–Mg$^{2+}$ (drainage minier), (2) eau riche en HCO3-–SO42-–Ca$^{2+}$ et (3) eau riche en HCO3-–Ca$^{2+}$ (eau douce). Le deuxième groupe d’eau est le résultat d’un mélange entre les deux autres groupes. Le faible pourcentage d’eau contaminée par le drainage minier indique qu’au vu du faible taux de dilution et de pollution, l’eau des sources peut être utilisé pour l’alimentation en eau potable.El sistema de aguas subterráneas de la cuenca Eva Verda (Valle Saint Marcel – parte meridional del Valle Aosta medio en Italia) tiene muchos manantiales que pueden ser usados como fuente de agua potable. Este área está cerca de la mina abandonada Servette, que puede ser una fuente de contaminantes (metales y sulfuros) para los manantiales situados pendiente abajo. La caracterización del acuífero fue hecha usando un enfoque multidisciplinario: geoestructural, litológico, hidrogeológico y geoquímica. En particular, el análisis geoestructural mostró que el sentido preferencial de flujo del agua está controlado por la tectónica y que ello tiene una tendencia a lo largo de la pendiente hacia los manantiales ubicadas en la parte baja. El sentido de flujo del drenaje de la mina está de acuerdo con esta tendencia y puede contaminar los manantiales. Los análisis químicos revelaron tres grupos de agua: (1) agua rica en HCO3-–SO42-–Ca$^{2+}$ (drenaje de la mina), (2) agua rica en HCO3-–SO42-–Ca$^{2+}$ y (3) agua rica en HCO3-–Ca$^{2+}$ (agua dulce). El segundo grupo de agua es la resultante de una mezcla de diferentes porcentajes entre la primera y tercera agua. El bajo porcentaje de agua contaminada de la mina demuestra que existe una alta dilución y baja contaminación de las aguas que pueden ser explotadas para el consumo.Saint Marcel峡谷位于意大利中Aosta峡谷南侧的Eva Verda盆地含水层系统有许多可以饮用的泉水出露。该区附近废弃的Servette矿, 可能是山下泉水的污染源 (金属和硫化物) 。采用多手段方法描述了含水层特征, 包括地质构造、岩性、水文地质和地球化学。地质构造分析表明, 优势流向受构造控制, 并有向坡下泉水出露点方向流动的趋势。尾矿水流向与此流向一致, 会污染泉水。水化学分析揭示了三种类型的水: (i) SO42--Ca$^{2+}$- Mg$^{2+}$型水 (尾矿水), (ii) HCO3-- SO42-- Ca$^{2+}$型水, (iii) HCO3-- Ca$^{2+}$型水 (淡水) 。第二种水是由第一种和第三种水按不同比例混合而成。矿坑污染水的比例较低说明该水存在高稀释和低污染, 可作为饮用水加以开发利用。O sistema de águas subterrâneas da bacia de Eva Verda (vale de Saint Marcel – lado sul do vale médio de Aosta, Itália) possui muitas nascentes que podem ser utilizadas como origens para água de abastecimento. Esta área é próxima da mina abandonada de Servette, que pode ser uma fonte poluidora (metais e sulfuretos) para as nascentes situadas abaixo na encosta. A caracterização do aquífero foi feita utilizando uma aproximação multidisciplinar: geoestrutural, litológica, hidrogeológica e geoquímica. Em particular, a análise geoestrutural mostrou que a direcção preferencial de fluxo é controlada pela tectónica e que este apresenta uma direcção tendencial de escoamento ao longo do declive em direcção às nascentes abaixo na encosta. A direcção de escoamento de drenagem da mina está de acordo com esta direcção e pode poluir as nascentes. As análises químicas revelaram três grupos de águas: (1) águas ricas em HCO3-–SO42-–Ca$^{2+}$ (drenagem da mina), (2) águas ricas em HCO3-–SO42-–Ca$^{2+}$ e (3) águas ricas em HCO3-–Ca$^{2+}$ (água doce). O segundo grupo de águas resulta da diferente percentagem de mistura entre o primeiro e o terceiro grupo. A baixa percentagem de água poluída pela mina demonstra que existe uma diluição elevada e uma poluição reduzida das águas, as quais podem ser exploradas para abastecimento de água potável.
Starting Page	487
Ending Page	499
Page Count	13
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	18
Issue Number	2
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2009-09-10
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Italy Groundwater flow Geochemistry Mining Fractured rocks 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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