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Transient Investigation of the Critical Abstraction Rates in Coastal Aquifers: Numerical and Experimental Study

Author

Listed:
  • Abdelrahman M. Abdelgawad

    (Applied Science Private University
    Assiut University)

  • Antoifi Abdoulhalik

    (Queen’s University Belfast, David Keir Building)

  • Ashraf A. Ahmed

    (Brunel University London)

  • Salissou Moutari

    (Queen’s University Belfast)

  • G. Hamill

    (Queen’s University Belfast, David Keir Building)

Abstract

This research investigated the transient saltwater upconing in response to pumping from a well in a laboratory-scale coastal aquifer. Laboratory experiments were completed in a 2D flow tank for a homogeneous aquifer where the time evolution of the saltwater wedge was analysed during the upconing and the receding phase. The SEAWAT code was used for validation purposes and to thereafter examine the sensitivity of the critical pumping rate and the critical time (the time needed for the saltwater to reach the well) to the well design and hydrogeological parameters. Results showed that the critical pumping rate and the critical time were more sensitive to the variations of the well location than the well depth. The critical time increased with increasing the location and depth ratios following a relatively linear equation. For all the configurations tested, the lowest critical pumping rate was found for the lower hydraulic conductivity, which reflects the vulnerability of low permeability aquifers to salinization of pumping wells. In addition, higher saltwater densities led to smaller critical pumping rate and shorter critical time. The influence of the saltwater density on the critical time was more significant for wells located farther away from the initial position of the interface. Moreover, increasing the dispersivity induced negligible effects on the critical pumping rate, but reduced the critical time for a fixed pumping rate.

Suggested Citation

  • Abdelrahman M. Abdelgawad & Antoifi Abdoulhalik & Ashraf A. Ahmed & Salissou Moutari & G. Hamill, 2018. "Transient Investigation of the Critical Abstraction Rates in Coastal Aquifers: Numerical and Experimental Study," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 32(11), pages 3563-3577, September.
    • Handle: RePEc:spr:waterr:v:32:y:2018:i:11:d:10.1007_s11269-018-1988-3
    DOI: 10.1007/s11269-018-1988-3
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    References listed on IDEAS

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    1. Grant Ferguson & Tom Gleeson, 2012. "Vulnerability of coastal aquifers to groundwater use and climate change," Nature Climate Change, Nature, vol. 2(5), pages 342-345, May.
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    1. Mahdi Motallebian & Hojjat Ahmadi & Amir Raoof & Nick Cartwright, 2022. "Impacts of Receding of the Lakes Located in the Arid and Semi-arid Areas on the Coastal Groundwater: Integrated Modeling and Experimental Study," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(11), pages 4057-4080, September.

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