scholarly journals Coastal aquifer recharge and groundwater–seawater exchanges using downscaled GRACE data: case study of the Djeffara plain (Libya–Tunisia)

2021 ◽  
Vol 353 (1) ◽  
pp. 297-318
Author(s):  
Julio Gonçalvès ◽  
Pierre Séraphin ◽  
Thomas Stieglitz ◽  
Amine Chekireb ◽  
Bruno Hamelin ◽  
...  
Keyword(s):  
Coastal Aquifer ◽  
Aquifer Recharge ◽  
Grace Data

scholarly journals Geophysical and Hydrogeological Investigations of Water Leakage from a Reservoir Dam to a Coastal Aquifer: The Lebna Case Study (Northeastern Tunisia)

2021 ◽  
Author(s):  
Nejmeddine Ouhichi ◽  
Radhouane Hamdi ◽  
Lachaal Fethi ◽  
Hakim GABTNI ◽  
Olivier grunberger
Keyword(s):  
Coastal Aquifer ◽  
Geological Mapping ◽  
Water Volume ◽  
Aquifer Recharge ◽  
Geophysical Research ◽  
Balance Calculation ◽  
Electrical Soundings ◽  
Northeastern Tunisia ◽  
The Right

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 27-year monitoring period, from 1990 to 2017, shows that an estimated water volume of 3.7 Mm3y-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. An interpretation of these geophysical data coupled with available borehole logging and piezometric measurements was used to define the leakage geometry from the reservoir dam to the coastal aquifer. The collected evidence led to the conclusion that concentrated recharge occurs in the downstream sections, especially on the right bank of the aquifer.

scholarly journals Hydrological and economic feasibility of mitigating a stressed coastal aquifer using managed aquifer recharge: a case study of Jamma aquifer, Oman

2019 ◽  
Vol 11 (1) ◽  
pp. 148-159 ◽  
Author(s):  
Mustafa El-Rawy ◽  
Ali Al-Maktoumi ◽  
Slim Zekri ◽  
Osman Abdalla ◽  
Rashid Al-Abri
Keyword(s):  
Coastal Aquifer ◽  
Managed Aquifer Recharge ◽  
Economic Feasibility ◽  
Aquifer Recharge
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