Mineralization and pollution sources in the coastal aquifer of Lebna, Cap Bon, Tunisia

Ziadi, Amira; Hariga, Najla Tlatli; Tarhouni, Jamila

doi:10.1016/j.jafrearsci.2019.01.004

Cited by 18 publications

(9 citation statements)

References 25 publications

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“…Indeed, the average piezometric gradients range from approximately 3‰ and can drop to inferior levels of 5‰ in areas where the aquifer is particularly thick (>20 m); this trend was observed in all 4 seasons, even in 2019, (ESM_4). Near the sea shore (<2 km distance), piezometric levels below sea level illustrate the influence of overpumping above sea water intrusion, as previously studied by researchers (Kingumbi et al 2005;Kouzana et al 2009;Zghibi et al 2013;Ziadi et al 2019).…”

Section: Piezometric and Electrical Conductivity Resultsmentioning

confidence: 54%

Geophysical and hydrogeological investigations of water leakage from a reservoir dam to a coastal aquifer: the Lebna Case Study (Northeastern Tunisia)

et al. 2022

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In semiarid regions, dams are useful for surface water storage, sediment sequestration, and aquifer recharge. Built in 1987 on the Cap Bon peninsula (in northeastern Tunisia), the Lebna Dam is considered a good example of a multifunctional reservoir. The dam feeds two important irrigation networks, stores large sediment quantities, and allows a significant recharge flow to the underlying aquifer. This work suggests new leakage flow and dam-aquifer interaction characterizations through the development of an approach that combines a water balance calculation, geological field observations, groundwater monitoring, and geophysical research.The hydrological balance calculation performed over the monitoring period ,shows that an estimated water volume of 3.7 Mm 3 y -1 has leaked from the Lebna reservoir to the coastal aquifer. Geological mapping of the Lebna Dam basin in summer 2019 revealed the existence of permeable layers of sands to sandstones exposed along the southern banks of the reservoir and extending to an elevation that included the water level when the dam is full; these rocks outcrop at approximately 16 m.a.s.l.A geophysical survey based on 67 vertical electrical soundings and 8 electrical resistivity tomography profiles in the area downstream of the reservoir was carried out to identify the lateral continuity of the recharge zones. Piezometric campaigns consisting of four field surveys in 2019 and 2020 were conducted in the region downstream of Lebna Dam, consisting of 71 water well samples.The collected evidence led to the conclusion that concentrated recharge occurs in the downstream bank of the dam.

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Section: Piezometric and Electrical Conductivity Resultsmentioning

confidence: 54%

Geophysical and hydrogeological investigations of water leakage from a reservoir dam to a coastal aquifer: the Lebna Case Study (Northeastern Tunisia)

et al. 2022

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“…An increase in nitrate concentrations in aquifers may be explained as follows: (1) high nitrate in shallow groundwater aquifers might cause by nitrate infiltration from rice fields, polluted canals, and rivers, and fishery ponds, and (2) high nitrate concentrations observed in deep aquifers may be because of the leakage of nitrate sources through and along well casings. Likewise, high nitrate concentrations in groundwater were also found in many coastal aquifers such as in Tunisia (Ziadi et al 2019), China (Peng et al 2018), India (Rao et al 2017), Palestine (Abu Al Naeem et al 2019, Mexico (Mahlknech et al 2017), Malaysia (Narany et al 2018;Sefie et al 2018), and Indonesia (Taufiq et al 2019). This situation indicates that nitrate pollution has become a common problem in many coastal aquifers in the world.…”

Section: Nitrate Contaminationmentioning

confidence: 96%

“…Various studies on the hydrogeochemical processes of groundwater in coastal aquifers and their controlling factors have been conducted (Abu Al Naeem et al 2019;Nogueira et al 2019;Sracek et al 2019;Ziadi et al 2019;Abboud 2018;Selvakumar et al 2017;Argamasilla et al 2017). These studies showed that multivariate statistical analyses of the hydrogeochemical, environmental tracer analyses and inverse geochemical modeling approaches could be used to interpret the hydrodynamics and hydrogeochemical processes in coastal aquifers.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemical characteristics of a multi-layered coastal aquifer system in the Mekong Delta, Vietnam

Tran

Tsujimura

et al. 2019

Environ Geochem Health

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Groundwater is a primary freshwater source for various domestic, industrial and agricultural purposes, especially in coastal regions where there are lacking surface water supply. However, groundwater quality in coastal regions is often threatened by seawater intrusion and contamination due to both anthropogenic activities and natural processes. Therefore, insights into groundwater geochemistry and occurrences are necessary for sustainable groundwater management in coastal regions. The main aim of this study is to investigate the hydrogeochemical characteristics and their influencing factors in a coastal area of the Mekong Delta, Vietnam (MD). A total of 286 groundwater samples were taken from shallow and deep aquifers for analyzing major ions and stable isotopes. The results show that deep groundwater is dominated by Ca-HCO 3 , Ca-Na-HCO 3 , Ca-Mg-Cl, and Na-HCO 3 while shallow groundwater is dominated by the Na-Cl water type. In this region, the main geochemical processes controlling groundwater chemistry are ion exchanges, mineralization and evaporation. Groundwater salinization in coastal aquifers of the Mekong Delta is caused by (1) paleoseawater intrusion and evaporation occurring in the Holocene and Pleistocene aquifers, (2) dissolution of salt sediment/rock and leakage of saline from upper to lower aquifers due to excessive groundwater exploitation and hydraulic connection. High nitrate concentrations in both shallow and deep aquifers are related to human activities. These results imply that groundwater extraction may exacerbate groundwater qualityrelated problems and suitable solutions for sustainable Electronic supplementary material The online version of this article (

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“…The seawater contribution to groundwater mineralization is determined by the end-member mixing analysis EMMA method and varies between 1 and 10% [36], while the contribution of fertilizers to groundwater mineralization is not yet determined.…”

Section: Stable Isotopesmentioning

confidence: 99%

Multivariate Pollution in the Coastal Aquifer of Lebna area, Northeastern Tunisia

Ziadi¹,

Tlatli²,

Tarhouni³

2020

Groundwater Hydrology

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Anthropogenic contamination and excessive water consumption endanger an overexploitation of groundwater, which causes groundwater mineralization in coastal aquifer of Lebna area. Consequently, the salinity of groundwater reserves increases and creates big economic, agricultural, and social problems. Moreover, agricultural activities are the main source of nitrate, sulfate, and potassium ions and contribute to groundwater salinization and contamination with increasing chloride and nitrate concentrations. The objectives of this research are to determine the main source of groundwater salinization in coastal aquifer of Lebna area to not confuse between seawater intrusion and fertilizer effects and to determine the salinity effects on the ecosystem. To reach this goal, several geological tools and hydrogeological data are used in combination with geochemical and geophysical methods.

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Mineralization and pollution sources in the coastal aquifer of Lebna, Cap Bon, Tunisia

Cited by 18 publications

References 25 publications

Geophysical and hydrogeological investigations of water leakage from a reservoir dam to a coastal aquifer: the Lebna Case Study (Northeastern Tunisia)

Geophysical and hydrogeological investigations of water leakage from a reservoir dam to a coastal aquifer: the Lebna Case Study (Northeastern Tunisia)

Hydrogeochemical characteristics of a multi-layered coastal aquifer system in the Mekong Delta, Vietnam

Multivariate Pollution in the Coastal Aquifer of Lebna area, Northeastern Tunisia

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