Volume 9, Issue 5, October 2020, Page: 107-122
Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River
Abdoul Aziz Gning, Faculty of Sciences and Technics, University Cheikh Anta Diop, Dakar, Senegal; Faculty of Training for Engineering, University of Thies, Thies, Senegal
Alassane Thiam, Faculty of Training for Engineering, University of Thies, Thies, Senegal
Raymond Malou, Faculty of Sciences and Technics, University Cheikh Anta Diop, Dakar, Senegal
Mapathé Ndiaye, Faculty of Sciences and Technics, University Cheikh Anta Diop, Dakar, Senegal
Received: Sep. 15, 2020;       Accepted: Oct. 5, 2020;       Published: Oct. 22, 2020
DOI: 10.11648/j.wros.20200905.13      View  68      Downloads  31
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.
Keywords
Groundwater, Salinization, Irrigation, Delta of Senegal River, Senegal
To cite this article
Abdoul Aziz Gning, Alassane Thiam, Raymond Malou, Mapathé Ndiaye, Hydrogeological Assessments of Impacts of Irrigation on Alluvial Water Table of Delta of Senegal River, Journal of Water Resources and Ocean Science. Vol. 9, No. 5, 2020, pp. 107-122. doi: 10.11648/j.wros.20200905.13
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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