CRUZ, J.V., SILVA, M.O., LOBO MENDONçA, J., DIAS, I., PRUDêNCIO, I. (2007) - Non-point pollution in the hydrosphere due to agricultural practices at Sete Cidades (Azores, Portugal): II. the saturated zone. In: Ribeiro, L., Chambel, A. e Condesso de Melo,

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Artigos em livros de atas ► Nacionais

Referência Bibliográfica

CRUZ, J.V., SILVA, M.O., LOBO MENDONÇA, J., DIAS, I., PRUDÊNCIO, I. (2007) – Non-point pollution in the hydrosphere due to agricultural practices at Sete Cidades (Azores, Portugal): II. the saturated zone. In: Ribeiro, L., Chambel, A. e Condesso de Melo, M.T. (Eds.), Abstract Book, XXXV IAH Congress “Groundwater and ecosystems”, Lisbon, 153-154.

Resumo

A field study was developed at Sete Cidades volcanic caldera, located in São Miguel, the westernmost island from the Azores archipelago, in order to study water composition in the unsaturated and saturated zones and the impacts on quality resulting from agriculture. Water in the saturated zone was sampled by monitoring of 4 springs that discharge from perched-water bodies, as well as through the installation of 7 piezometers. A regional survey of the groundwater composition at a regional scale was also made. Groundwater present generally a low mineralization and is mainly from Na-HCO₃ and Na-HCO₃-Cl types. Comparing data from piezometers installed in pastures with other site where human activity is limited, is possible to shown that nitrate content is substantially higher in areas where agriculture is taken place. Spatial variability on the nitrate content is also observed in the monitored springs that discharge from perched-water bodies.

Observações

Anexos

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