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Proc. IAHS, 378, 29-35, 2018
https://doi.org/10.5194/piahs-378-29-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Post-conference publication
29 May 2018
Spatio-temporal variations of hydrochemical and isotopic patterns of groundwater in hand-dug wells: the Cuvelai-Etosha Basin, Namibia
Josefina Tulimevava Hamutoko1, Heike Wanke1, Matthias Beyer2, Marcel Gaj2,3, and Paul Koeniger2 1Geology Department, University of Namibia (UNAM), 340 Mandume Ndemufayo Avenue, Windhoek, Namibia
2Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany
3Global Institute for Water Security, School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Canada
Abstract. The rural population in parts of the Cuvelai-Etosha Basin (CEB) in Namibia depends on groundwater as a source for drinking and livestock watering. The aim of this study is to investigate spatial-temporal patterns for understanding water origins and recharge processes of perched aquifers in the CEB. The study uses hydrochemical data and water stable isotope signatures (18O and 2H) of samples collected during (10) ten field campaigns over a three-year period (from 2014 to 2016) originating from two regions within the basin (Ohangwena and Omusati). A clear distinction between the shallow groundwater in the Omusati and Ohangwena regions documented by TDS values, hydrochemical water types as well as the isotopic compositions of water. These differences are influenced mainly by their location in the landscape, depth to water table, the type of well infrastructure and aquifer material. Spatial and temporal variations indicate that even though these perched aquifers are both within the same basin, they are chemically different because of the rock materials in which their flow. Therefore, these differences in the water hydrochemical composition as well as the processes governing perched aquifers must be taken into account when planning groundwater management in the basin.
Citation: Hamutoko, J. T., Wanke, H., Beyer, M., Gaj, M., and Koeniger, P.: Spatio-temporal variations of hydrochemical and isotopic patterns of groundwater in hand-dug wells: the Cuvelai-Etosha Basin, Namibia, Proc. IAHS, 378, 29-35, https://doi.org/10.5194/piahs-378-29-2018, 2018.
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The key finding was that groundwater chemistry of perched aquifers is controlled by dissolution of carbonate or evaporitic minerals, silicate weathering and ion exchange and stable isotopes signify recent recharge. Spatial and temporal variations indicate that groundwater from perched aquifers are chemically different reflecting the aquifer lithologies and hydrological landscape thus groundwater management practices should always be designed taking into account these specific characteristics.
The key finding was that groundwater chemistry of perched aquifers is controlled by dissolution...
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