Geochemistry of heavily exploited aquifers in the Emilia-Romagna region (Po Valley, northern Italy) |
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Authors: | G. Martinelli A. Minissale C. Verrucchi |
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Affiliation: | (1) Regione Emilia-Romagna, Servizio Cartografico e Geologico, V.le A. Silvani 4/3, I-40122 Bologna, Italy Fax:+39 055 218 628, IT;(2) CNR-Centro di Sudio per la Minerogenesi e la Geochimica Applicata, Via La Pira 4, I-50121 Firenze, Italy, IT;(3) Geo STAT, Elaborazioni Statistiche Dati Territoriali ed Ambientali, Via Cassioli 1, I-50018 Scandicci, Italy, IT |
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Abstract: | More than 5 800 chemical analyses on water samples collected during 1987–1995 from 528 monitoring wells located in the southernmost part of the Po Valley (Emilia-Romagna region, northern Italy), one of the most urbanized, industrialized and agriculturally developed areas of Italy, have been processed. The analysis of data showed that: (1) waters are discharging from both confined and unconfined aquifers; (2) the water in the unconfined aquifer(s) is Ca(Mg)-HCO3 in composition while confined ones are Na-Cl and/or Na-(HCO3); (3) both confined and unconfined aquifer samples have δ18O and δD isotopic values of meteoric signature; (4) waters from both the aquifers are at least 40 years old; (5) the pumping rate has caused subsidence, particularly where the aquifer(s) is (are) unconfined; (6) the unconfined aquifer(s) is exposed to the risk of NO3 pollution; (7) considering the present "pressure" (i.e. pumping rate) on this natural environment by human activity, care must be taken in the future to preserve this "strategic" resource. Received: 27 October 1997 · Accepted: 12 March 1998 |
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Keywords: | Groundwaters Nitrate Pollution Subsidence Urban Areas Italy |
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