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Chenini I.,Minerals Resources and Environment Laboratory | Mammou A.B.,Minerals Resources and Environment Laboratory | Turki M.M.,UR Sedimentary Basin Dynamic | Mercier E.,CNRS Nantes Laboratory of Planetology and Geodynamics
Arabian Journal of Geosciences | Year: 2010

The knowledge of piezometric data is of vast interest in many applications, such as assessing groundwater flow direction and identifying recharge zone of the aquifer. In this paper, a methodology is presented as a complementary approach to characterize multilayered aquifer system structure and functioning using piezometric data and the cartography of the hydraulic charge difference. The methodology is presented to gradually discriminate the aquifer system levels and to evaluate the spatial distribution of hydraulic heads. The hydraulic charge difference mapping permits to track spatial evolution of the impermeable levels. The methodology has been applied over the Maknassy basin aquifer system, located in central Tunisia. The obtained results, showing the multilayered aquifer structure, are validated using hydrochemical approach and piezometric data not considered in the reasoning. © 2009 Saudi Society for Geosciences.

Chenini I.,Minerals Resources and Environment Laboratory | Mammou A.B.,Minerals Resources and Environment Laboratory | May M.E.,Tunis el Manar University
Water Resources Management | Year: 2010

The groundwater recharge zone mapping often requires a large amount of spatial information and criteria. Geographic information systems are capable of managing large amount of spatially related information, providing the ability to integrate multiple layers of information for multi-criteria analysis. To show the capabilities of GIS techniques for mapping groundwater refill zone in arid area, a study was carried out in the Maknassy basin located in Central Tunisia. This evaluation incorporates historic rainfall data analysis, watershed drainage density, surficial geology and aquifer boundary conditions. The study basin is categorized according to the previous criteria. Multi-criteria analysis is performed to evaluate suitability to the groundwater recharge for each factor, according to its associated weight. The thematic layers were integrated with one another using the weighted aggregation method to derive the groundwater recharge map. The results demonstrated that the GIS methodology has good functionality for mapping groundwater recharge zone. © 2009 Springer Science+Business Media B.V.

Farhat B.,Minerals Resources and Environment Laboratory | Mammou A.B.,Minerals Resources and Environment Laboratory | Kouzana L.,Minerals Resources and Environment Laboratory | Chenini I.,Minerals Resources and Environment Laboratory | And 2 more authors.
Resource Geology | Year: 2010

The present paper investigates hydrochemical processes and water quality in the Mornag aquifer in NE Tunisia. Groundwater samples were collected during a field campaign, and were analysed for major and trace elements. The collected waters have a chemical facies rich in Ca2+, Na+ and Cl-. Piper diagram shows a progressive increase in chloride ions along with increasing salinity. Saturation indexes calculated by using PHREEQC (USGS) show that the Mornag waters are slightly saturated with respect to carbonates (calcite and dolomite), while undersaturated with respect to gypsum, halite and other evaporitic minerals. The current composition of waters takes place via dissolution of halite and Ca-sulfates, where the increase in calcium is partially balanced by possible calcite precipitation. The relevant recorded pollutant is nitrate, which was likely dispersed from agricultural soils, while heavy metals were generally far below values of pollution thresholds, indicating no influence by mining activity. © 2010 The Authors. Resource Geology © 2010 The Society of Resource Geology.

Mseddi H.,Minerals Resources and Environment Laboratory | Ben Mammou A.,Minerals Resources and Environment Laboratory | Oueslati W.,Minerals Resources and Environment Laboratory
Chemical Speciation and Bioavailability | Year: 2010

This study aims to optimise the method by which carbonate-bound trace metals are extracted during sequential extractions of carbonate-rich contaminated soils. Specifically, we aim to optimise the volume and concentration of sodium acetate that must be added to samples to completely dissolve carbonate, and hence to release into solution all trace metals associated with this phase. We apply a range of volumes and concentrations of sodium acetate to fixed masses of two raw soil samples (H1) and (H2) from the mining region of Lakhouat (Gouvernorat of Siliana Tunisia). The soils contain >80% carbonates, and carbonate-phase trace metals are therefore expected to be a major fraction of the total trace metal contamination. The applied range of volumes and concentrations of sodium acetate typifies those used in existing sequential extraction protocols. By X-ray diffraction analysis of the solid phase before and after extraction, we show that complete carbonate removal is guaranteed by application of 2 M sodium acetate, at 40 mL per gram of soil. Lower concentrations and volumes fail to completely dissolve soil carbonate. Atomic absorption analysis of the extracts shows concentrations of Zn and Pb to be highest in the samples from which the carbonate is completely removed, confirming the association of these metals with the carbonate phase.

Chenini I.,Minerals Resources and Environment Laboratory | Ben Mammou A.,Minerals Resources and Environment Laboratory
Computers and Geosciences | Year: 2010

To demonstrate the capabilities of Geographic Information System (GIS) techniques and numerical modeling for groundwater resources development in arid areas, specifically for the demarcation of suitable sites for the artificial recharge of groundwater aquifers, a study was carried out in the Maknassy basin, which is located in Central Tunisia. Thematic maps were prepared using a Hydrogeological Information System. All of the thematic layers were integrated using an ARCVIEW based model, enabling a map showing artificial recharge zones to be generated. Meanwhile, a ground water model, MODFLOW-2001, was used to estimate the effect of such water recharge on the piezometric behavior of the hydrological system. Additionally, these simulations helped manage ground water resources in the study area. The GIS-based demarcation of artificial zones developed in this study was based on logical conditions and reasoning, so that the same techniques, with appropriate modifications, could be adopted elsewhere, especially in similar aquifer systems in arid areas where the occurrence of groundwater is restricted and subject to a greater complexity. The efficiency of artificial recharge may be tested using hydrogeological modeling by simulating the effect of a potential groundwater refill. © 2010 Elsevier Ltd.

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