Journal of Water Resources and Ocean Science

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Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River

Received: 15 September 2020    Accepted: 05 October 2020    Published: 22 October 2020
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Abstract

Building dams on the Senegal River has facilitated the development of irrigated farming in Delta of Senegal River. However, this practice is threatened by the increasing degradation of soils mainly caused by salinization. The main cause of this problem is the presence of a salty aquifer at a low depth. Nevertheless, the characteristics and functioning of this aquifer are not well known. The main objective of this study, funded by Wallonie-Brussels International, is a contribution to the characterization of the hydrodynamic functioning, the hydro geochemistry of the aquifer and to identify the impact on agricultural waters. A two-step methodology has been developed: Firstly, a regional survey has been performed in the whole delta; secondly an irrigation plot has been monitored to have a detailed description of the groundwater dynamic and of the transport of salt under irrigation. Results of the regional survey show (1) the main factors that explain the fluctuation of the groundwater level are the artificial high water levels in the River, rice growing and to a lesser extent precipitation and (2) the high salt concentration in the upper aquifer. The monitoring of the Ndelle rice growing area (30 km to the North-East of Saint-Louis) has allowed calculating water and salt budgets at the scale of the irrigation plot. The influence of the irrigation on the groundwater levels has also been studied.

DOI 10.11648/j.wros.20200905.13
Published in Journal of Water Resources and Ocean Science (Volume 9, Issue 5, October 2020)
Page(s) 107-122
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Groundwater, Salinization, Irrigation, Delta of Senegal River, Senegal

References
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Author Information
  • Faculty of Sciences and Technics, University Cheikh Anta Diop, Dakar, Senegal; Faculty of Training for Engineering, University of Thies, Thies, Senegal

  • Faculty of Training for Engineering, University of Thies, Thies, Senegal

  • Faculty of Sciences and Technics, University Cheikh Anta Diop, Dakar, Senegal

  • Faculty of Sciences and Technics, University Cheikh Anta Diop, Dakar, Senegal

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    Abdoul Aziz Gning, Alassane Thiam, Raymond Malou, Mapathé Ndiaye. (2020). Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River. Journal of Water Resources and Ocean Science, 9(5), 107-122. https://doi.org/10.11648/j.wros.20200905.13

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    Abdoul Aziz Gning; Alassane Thiam; Raymond Malou; Mapathé Ndiaye. Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River. J. Water Resour. Ocean Sci. 2020, 9(5), 107-122. doi: 10.11648/j.wros.20200905.13

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    AMA Style

    Abdoul Aziz Gning, Alassane Thiam, Raymond Malou, Mapathé Ndiaye. Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River. J Water Resour Ocean Sci. 2020;9(5):107-122. doi: 10.11648/j.wros.20200905.13

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  • @article{10.11648/j.wros.20200905.13,
      author = {Abdoul Aziz Gning and Alassane Thiam and Raymond Malou and Mapathé Ndiaye},
      title = {Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River},
      journal = {Journal of Water Resources and Ocean Science},
      volume = {9},
      number = {5},
      pages = {107-122},
      doi = {10.11648/j.wros.20200905.13},
      url = {https://doi.org/10.11648/j.wros.20200905.13},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.wros.20200905.13},
      abstract = {Building dams on the Senegal River has facilitated the development of irrigated farming in Delta of Senegal River. However, this practice is threatened by the increasing degradation of soils mainly caused by salinization. The main cause of this problem is the presence of a salty aquifer at a low depth. Nevertheless, the characteristics and functioning of this aquifer are not well known. The main objective of this study, funded by Wallonie-Brussels International, is a contribution to the characterization of the hydrodynamic functioning, the hydro geochemistry of the aquifer and to identify the impact on agricultural waters. A two-step methodology has been developed: Firstly, a regional survey has been performed in the whole delta; secondly an irrigation plot has been monitored to have a detailed description of the groundwater dynamic and of the transport of salt under irrigation. Results of the regional survey show (1) the main factors that explain the fluctuation of the groundwater level are the artificial high water levels in the River, rice growing and to a lesser extent precipitation and (2) the high salt concentration in the upper aquifer. The monitoring of the Ndelle rice growing area (30 km to the North-East of Saint-Louis) has allowed calculating water and salt budgets at the scale of the irrigation plot. The influence of the irrigation on the groundwater levels has also been studied.},
     year = {2020}
    }
    

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  • TY  - JOUR
    T1  - Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River
    AU  - Abdoul Aziz Gning
    AU  - Alassane Thiam
    AU  - Raymond Malou
    AU  - Mapathé Ndiaye
    Y1  - 2020/10/22
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    N1  - https://doi.org/10.11648/j.wros.20200905.13
    DO  - 10.11648/j.wros.20200905.13
    T2  - Journal of Water Resources and Ocean Science
    JF  - Journal of Water Resources and Ocean Science
    JO  - Journal of Water Resources and Ocean Science
    SP  - 107
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    PB  - Science Publishing Group
    SN  - 2328-7993
    UR  - https://doi.org/10.11648/j.wros.20200905.13
    AB  - Building dams on the Senegal River has facilitated the development of irrigated farming in Delta of Senegal River. However, this practice is threatened by the increasing degradation of soils mainly caused by salinization. The main cause of this problem is the presence of a salty aquifer at a low depth. Nevertheless, the characteristics and functioning of this aquifer are not well known. The main objective of this study, funded by Wallonie-Brussels International, is a contribution to the characterization of the hydrodynamic functioning, the hydro geochemistry of the aquifer and to identify the impact on agricultural waters. A two-step methodology has been developed: Firstly, a regional survey has been performed in the whole delta; secondly an irrigation plot has been monitored to have a detailed description of the groundwater dynamic and of the transport of salt under irrigation. Results of the regional survey show (1) the main factors that explain the fluctuation of the groundwater level are the artificial high water levels in the River, rice growing and to a lesser extent precipitation and (2) the high salt concentration in the upper aquifer. The monitoring of the Ndelle rice growing area (30 km to the North-East of Saint-Louis) has allowed calculating water and salt budgets at the scale of the irrigation plot. The influence of the irrigation on the groundwater levels has also been studied.
    VL  - 9
    IS  - 5
    ER  - 

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