NDLI: Hydrochemistry and isotope geochemistry as tools for groundwater hydrodynamic investigation in multilayer aquifers: a case study from Lomellina, Po plain, South-Western Lombardy, Italy

Content Provider	Springer Nature Link
Author	Pilla, Giorgio Sacchi, Elisa Zuppi, Gianmaria Braga, Giovanni Ciancetti, Gianfranco
Copyright Year	2005
Abstract	A multicriteria approach in studying hydrodynamics of a multilayer aquifer system has been used in the Lomellina region (Northern Italy). It involves the reconstruction of the hydrogeological framework coupled to the definition of the hydrochemical and isotopic features of the aquifers. A shallow phreatic aquifer, reaching depths of about 60–80 m from the surface, and deeper aquifers containing confined groundwater, were distinguished.Groundwater generally shows mineralisation decreasing with depth; dissolved ions depict calcium-bicarbonate hydrochemical facies and stable isotopes define the recharge mechanisms, the origin of groundwater, and the hydraulic confinement of deep aquifers. The phreatic aquifer is fed by local infiltration and by streams and irrigation channels. Tritium and Carbon-14 groundwater dating indicate long residence times (on the order of thousands of years) for confined aquifers.The confined aquifers show essentially passive hydrodynamic conditions and maintain a higher piezometric level than the phreatic aquifer. This inhibits the possibility of recent water penetrating far below the surface. The hydrogeological setting of the Lomellina region displays features which are common to other sectors of the Po plain. As a consequence, the results of this study, although conducted on a restricted area, are highly illustrative of groundwater hydrodynamics in large sedimentary aquifers.Une approche multicritère pour l’étude hydrodynamique d’un aquifère multi-couche a été appliquée à la Région de Lomellina dans le Nord de l’Italie. Elle implique la reconstruction du cadre hydrogéologique, couplée à la définition des données hydrochimiques et isotopiques des aquifères. Un aquifère phréatique, atteignant des profondeurs comprises entre 60 et 80 mètres sous la surface, et les aquifères profonds et captifs sont distingués. Les eaux souterraines montrent générallement une minéralisation décroissante avec la profondeur; les ions dissouts représentent les facièes hydrochimiques bicarbonaté-calcique, tandis que les isotopes définissent les mécanismes de recharge, l’origine des eaux souterraines, et le confinement hydraulique des aquifères pronfonds. L’aquifère phréatique est alimenté par une infiltration locale, par les cours d’eau et les canaux d’irrigation. Les datations au tritium et au Carbone 14 des eaux souterraines, indiquent des temps de résidence longs (plusieurs centaines d’années) pour les aquifères captifs. Les aquifères captifs montrent des conditions hydrodynamiques essentiellement passives, et maintiennent un niveau piézométrique plus élevé que celui des nappes phréatiques. Ceci inhibe la possibilité des eaux de surface de pénétrer les aquifères profonds. La région de Lomellina montre des similitudes hydrogéologiques avec les autres régions de la plaine du Po. Par conséquence, les résultats de cette étude, bien que conduite sur une zone restreinte, est grandement illustrative de l’hydrodynamique des eaux souterraines dans les grands aquifères sédimentaires.Se ha utilizado un enfoque de multicriterios para estudiar la hidrodinámica de un sistema de acuíferos de capas múltiples en la región Lomelina del norte de Italia. El enfoque involucra la reconstrucción del marco hidrogeológico a la par de definir las características isotópicas e hidroquímicas de los acuíferos. Se distinguieron un acuífero freático somero, que alcanza profundidades de casi 60–80 m de la superficie, y acuíferos más profundos que contienen agua subterránea confinada. El agua subterránea muestra generalmente mineralización que disminuye con la profundidad; los iones disueltos muestran facies hidroquímicas de calcio-bicarbonato y los isótopos estables definen los mecanismos de recarga, el origen del agua subterránea, y el confinamiento hidráulico de acuíferos profundos. El acuífero freático es alimentado por infiltración local y por arroyos y canales de riego. La datación de aguas subterráneas con tritio y carbono-14 indica tiempos de residencia largos (en el orden de miles de años) para los acuíferos confinados. Los acuíferos confinados muestran esencialmente condiciones hidrodinámicas pasivas y mantienen un nivel piezométrico más alto que los acuíferos freáticos. Esta situación inhibe la posibilidad de que agua reciente penetre muy por debajo de la superficie. El marco hidrogeológico de la región de Lomelina ilustra características que son comunes a otros sectores de la planicie Po. Por lo tanto, los resultados de este estudio, aunque realizados en un área restringida, son altamente ilustrativos de la hidrodinámica de aguas subterráneas en acuíferos sedimentarios grandes.
Starting Page	795
Ending Page	808
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	14
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-11-19
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrochemistry Stable isotopes Groundwater age Alluvial aquifers Northern Italy Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Hydrogeology Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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