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The groundwater quality of the mio-pliocene aquifer in South–East of Tunisia

Congress: 2008
Author(s): Fadoua HAMZAOUI, Rachida BOUHLILA, Moncef GUEDDARI
E-mail : fadoua_fst @yahoo.fr, bouhlila.rachida@enit.rnu.tn, moncef.gueddari@ fst.rnu.tn

Keyword(s): Mio-pliocene aquifer, Principal Component Analysis, major elements, geochemical facies, Tunisia
AbstractThe objective of this study is to describe the principal characteristics of the groundwaters in the mio-pliocene aquifer, located in South–East of Tunisia,by using the physico-chemical approach. Major elements concentrations as well as temperature, pH and salinity, were monitored from 2004 and 2005 in 14 wells capturing the mio-pliocene aquifer. Water of this aquifer is used unevenly by different economic sectors. Anthropogenic activities in this region rely mainly on agricultural and tourism. Exploratory analyses of experimental data have been carried out by statistical analysis (Principal Component Analysis (PCA) and geographic information system (GIS) in an attempt to discriminate sources of variation of water quality. The application of PCA has achieved a meaningful classification of wells waters samples based on seasonal and spatial criteria. Results reveal that salinity and the major elements concentrations, with the exception bicarbonates, increase towards groundwater flow. The saline load of these waters is in first place controlled by chloride, sulfphate, sodium and calcium concentrations. The distribution of the salinity rations shows the same regional zonation as the one observed for chloride, sodium, sulphate, magnesium and calcium. Salinity spatial distribution indicate that waters in Bogra, Golf Jerba, Sirenes wells are characterized to be the highest in dissolved salts. The chemical composition interpretation clearly evidences tow main geochemical facies Cl-SO4- Na and Cl-Ca-Na
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