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Groundwater recharge dams in arid areas as tools for aquifer replenishment and mitigating seawater intrusion: example of AlKhod, Oman

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Abstract

Groundwater depletion and seawater intrusion constitute major challenges along coastal aquifers in arid areas. This paper assesses the role of groundwater recharge dams constructed to replenish aquifers and fight seawater intrusion with reference to AlKhod dam, Oman, sited 7 km from the coast on a gravely unconfined aquifer. Water table rise in piezometers located downstream from the dam shows regular patterns correlating with magnitude of wadi flow, whereas upstream piezometers show irregular patterns. Controlled release of water captured by the dam optimizes water percolation and enhances artificial recharge which was estimated in the wet years 1997, 2003 and 2005 as 15, 22 and 27 Mm3, respectively, using water table fluctuation method. Recharge contributed 40–60 % of the total annual abstraction. Groundwater salinity increased in the 1980s and 1990s and the saline/freshwater interface advanced inland, but has receded partially after 1997 (highest rainfall) and completely after 2005 indicated by reduction in electrical conductivity and thickening of freshwater lens. The recession is attributed to the dam’s induced recharge and reduction of pumping in 2004 following the commissioning of Barka desalination plant. Integrating artificial recharge with groundwater resources management is therefore an effective measure to replenish aquifers in arid areas and mitigate seawater intrusion along the coasts.

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Acknowledgments

This project was funded by the His Majesty Fund grant #SR/SCI/ETHS/11/01. We would like to thank the Ministry of Regional Municipalities and Water Resources for providing the data.

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Authors and Affiliations

  1. Department of Earth Sciences, Sultan Qaboos University, P.O. Box 36, AlKod, 123, Oman

    Osman A. E. Abdalla

  2. Water Research Center, Sultan Qaboos University, P.O. Box 17, AlKod, 123, Oman

    Osman A. E. Abdalla

  3. Ministry of Regional Municipalities and Water Resources, AlKhwair, Oman

    Abdullah S. Al-Rawahi

  4. Department of Water Resources Development, P. O. Box 2575, Ruwi, 112, Oman

    Abdullah S. Al-Rawahi

Authors
  1. Osman A. E. Abdalla
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  2. Abdullah S. Al-Rawahi
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Correspondence to Osman A. E. Abdalla.

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Abdalla, O.A.E., Al-Rawahi, A.S. Groundwater recharge dams in arid areas as tools for aquifer replenishment and mitigating seawater intrusion: example of AlKhod, Oman. Environ Earth Sci 69, 1951–1962 (2013). https://doi.org/10.1007/s12665-012-2028-x

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  • DOI: https://doi.org/10.1007/s12665-012-2028-x

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