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Application of geochemical and stable isotopic tracers to investigate groundwater salinity in the Ochi-Narkwa Basin, Ghana

Abstract : Rainwater, groundwater and soil-water samples were analysed to assess groundwater geochemistry and the origin of salinity in the Ochi-Narkwa basin of the Central Region of Ghana. The samples were measured for major ions and stable isotopes (O-18, H-2 and C-13). The Cl- content in rainwater decreased with distance from the coast. The major hydrochemical facies were Na-Cl for the shallow groundwaters and Ca-Mg-HCO3, Na-Cl and Ca-Mg-Cl-SO4 for the deep groundwaters. Groundwater salinization is caused largely by halite dissolution and to a minor extent by silicate weathering and seawater intrusion. Stable isotope composition of the groundwaters followed a slope of 3.44, suggesting a mixing line. Chloride profiles in the soil zone revealed the existence of salt crusts, which support halite dissolution in the study area. A conceptual flow model developed to explain the mechanism of salinization showed principal groundwater flow in the NW-SE direction.
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https://hal-brgm.archives-ouvertes.fr/hal-01818006
Contributeur : Myriam Chergui <>
Soumis le : lundi 18 juin 2018 - 15:58:03
Dernière modification le : mardi 31 mars 2020 - 16:06:21

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Samuel Ganyaglo, Shiloh Osae, Tetteh Akiti, Thomas Armah, Laurence Gourcy, et al.. Application of geochemical and stable isotopic tracers to investigate groundwater salinity in the Ochi-Narkwa Basin, Ghana. Hydrological Sciences Journal, Taylor & Francis, 2017, 62 (8), pp.1301 - 1316. ⟨10.1080/02626667.2017.1322207⟩. ⟨hal-01818006⟩

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