Hydrochemical and isotopic behaviour of a Saharan phreatic aquifer suffering severe natural and anthropic constraints (case of Oued-Souf region, Algeria)

Guendouz, A.; Moulla, Adnane Souffi; Rémini, Boualem; Michelot, Jean‐Luc

doi:10.1007/s10040-005-0020-1

Cited by 31 publications

(9 citation statements)

References 4 publications

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“…Transfers of water between aquifers are difficult revealed by "traditional" methods of hydrogeology. However, this phenomenon has often been highlighted by the study of environmental isotopes [1,2,[34][35][36][37][38]. For this study, 33 groundwater samples were selected for δ18O, δ2H and δ3H measurements are performed by the National Energy Center and Nuclear Science and Technology.…”

Section: Isotopes Of Water Molecule (18o/2h)mentioning

confidence: 99%

Contributions of Chemical and Isotopic Tools for Understanding the Groundwater Modes Recharge and Flow in the Lower Cretaceous Aquifer in the Moroccan Sahara

Edoulati¹,

Boutaleb²,

Bettar³

et al. 2013

JWARP

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The present work was conducted in the basin of Laayoun-Dakhla (South Morocco) to: 1) identify the recharge and flow characteristics of the Lower Cretaceous aquifer (LC); and 2) provide information about the mineralization of aquifer’s water. Isotopic and hydrochemical compositions combined with the geological and hydrogeological settings were used for this purpose. The principal changes in chemical composition of LC groundwater result from mixing with water of deeper circulation. Closer analysis of available chemical data reveals the importance of dissolution/precipitation processes in evolution of groundwater chemistry. Piezometric levels, as well as chemical and isotopic composition of groundwaters, confirm hydraulic connection between the LC and the others aquifers. Overlap of some major characteristics (δ18O, δ2H, Cl^-) in this aquifer suggests that mixing processes considerably influence the hydrochemical evolution of water. The surface electrical resistivity does not indicate any freshwater-saltwater interface in the coastal aquifer and the relationship between 18O and Cl allows us to reject the hypothesis of a seawater intrusion.

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Section: Isotopes Of Water Molecule (18o/2h)mentioning

confidence: 99%

Contributions of Chemical and Isotopic Tools for Understanding the Groundwater Modes Recharge and Flow in the Lower Cretaceous Aquifer in the Moroccan Sahara

Edoulati¹,

Boutaleb²,

Bettar³

et al. 2013

JWARP

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“…This subdivision into two subgroups is consistent with the subdivision made in the Oued Souf phreatic aquifer (Algeria) on the basis of tritium contents (Guendouz et al 2006). The Djerid and Oued Souf regions are both part of the Great Oriental Erg Basin.…”

Section: Resultsmentioning

confidence: 63%

“…Mixing of waters by upward leakage between CI and CT aquifers (Gonfiantini et al 1974) and between CT and PQ aquifers (Kamel et al 2005;Guendouz et al 2006) has been confirmed by several previous isotopic studies, but the rate of leakage has not been computed.…”

Section: Introductionmentioning

confidence: 72%

Recharge of the plio-quaternary water table aquifer in Tunisian chotts region estimated from stable isotopes

Kamel

2010

Environ Earth Sci

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The hydrodynamic groundwater data and stable isotopes of water have been used jointly for better understanding of upward leakage and mixing processes in the Djerid aquifer system (southwestern Tunisia). The aquifer system is composed of the upper unconfined Plio-Quaternary (PQ) aquifer, the intermediate (semi-)confined Complex Terminal (CT) aquifer and the deeper confined Continental Intercalaire (CI) aquifer. A total of 41 groundwater samples from the CT and PQ aquifers were collected during June 2001. The stable isotope composition of waters establishes that the CT deep groundwater (depleted as compared to present Nefta local rainfall) is ancient water recharged during late Quaternary time. The relatively recent water in the shallow PQ aquifer is composed of mixed water resulting from upward leakage and sporadic meteoric recharge. In order to characterize the meteoric input signal for PQ in the study area, rainfall water samples were collected during 4 years (2000)(2001)(2002)(2003) at the Nefta meteorological station. Weighted mean values of isotopic contents with respect to rainfall amounts have been computed. Despite the short collection period in the study area, results agree with those found in Beni Abbes (southwestern Algerian Sahara) by Fontes on 9 years of rainfall surveillance. Stable isotopic relationships provide clear evidence of shallow PQ aquifer replenishment by deep CT groundwater. The 18 O/upward leakage rate allowed the identification of distinctive PQ waters related to CT aquifer configuration (confined in the western part of the study area, semi-permeable in the eastern part). These trends were confirmed by the relation 18 O/TDS. The isotope balance model indicated a contribution of up to 75% of the deep CT groundwater to the upper PQ aquifer in the western study area, between Nefta and Hazoua.

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“…Isotope signatures of this aquifer indicate evaporative enrichment and the presence of evaporite formations, and the tritium content indicates a recent recharge by precipitation (Guendouz et al 2006). Salt contents of groundwater from the CI and CT range between 1,000 to 4,000 mg/L TDS.…”

Section: Souf Valley Se Algeriamentioning

confidence: 94%

Impacts of agricultural irrigation on groundwater salinity

et al. 2018

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Agricultural irrigation represents the main use of global water resources. Irrigation has an impact on the environment, and scientific evidence suggests that it inevitably leads to salinization of both soil and aquifers. The effects are most pronounced under arid and semi-arid conditions. In considering the varied impacts of irrigation practices on groundwater quality, these can be classed as either directthe direct result of applying water and accompanying agrochemicals to croplandor indirectthe effects of irrigation abstractions on groundwater hydrogeochemistry. This paper summarizes and illustrates through paradigmatic case studies the main impacts of irrigation practices on groundwater salinity. Typically, a diverse range of groundwater salinization processes operating concomitantly at different time scales (from days to hundreds of years) is involved in agricultural irrigation. Case studies suggest that the existing paradigm for irrigated agriculture of focusing mainly on crop production increases has contributed to widespread salinization of groundwater resources.

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Hydrochemical and isotopic behaviour of a Saharan phreatic aquifer suffering severe natural and anthropic constraints (case of Oued-Souf region, Algeria)

Cited by 31 publications

References 4 publications

Contributions of Chemical and Isotopic Tools for Understanding the Groundwater Modes Recharge and Flow in the Lower Cretaceous Aquifer in the Moroccan Sahara

Contributions of Chemical and Isotopic Tools for Understanding the Groundwater Modes Recharge and Flow in the Lower Cretaceous Aquifer in the Moroccan Sahara

Recharge of the plio-quaternary water table aquifer in Tunisian chotts region estimated from stable isotopes

Impacts of agricultural irrigation on groundwater salinity

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