Volume 18, Issue 3, November 2016, Pages 885–903
Hamit ABDERAMANE1, Moumtaz RAZACK2, and Claude FONTAINE3
1 Department of Hydrogeologye UMR 7185, University of Poitiers, France
2 Department of Hydrogeologye UMR 7185, University of Poitiers, France
3 Department of Hydrogeologye UMR 7185, University of Poitiers, France
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The Chari-Baguirmi aquifer, located East of Lake Chad, is the main source of water in this region. The groundwater piezometry is marked by a large depression. The work presented here aims to understand the development of this depression. The approach is based on a sedimentological study coupled to a hydrogeochemical study of the groundwater. The sedimentological analysis revealed the grain size heterogeneity of the different layers. Clay mineralogy showed that the deposition of sediments takes place from the periphery to the center of the depression. This sedimentation mode suggests the existence of a morphological cuvette to which sediments are driven by the transport agent. We deduced the existence of a "structural" depression unlike the common assumption of an origin due to accentuated evaporation of the groundwater over the depression area. The combined study of chloride and oxygen-18 has shown that the area between Lake Chad and the piezometric depression is a special evaporation zone. This means that the process of evaporation of groundwater does not occur mainly in the center of the depression. The first results of this work provide new insights into the functioning of this important aquifer system and the establishment of the large Chari Baguirmi piezometric depression.
Author Keywords: Lake Chad, Chari Baguirmi aquifer, piezometric depression, structural depression, hydrochemistry, isotopes.
Hamit ABDERAMANE1, Moumtaz RAZACK2, and Claude FONTAINE3
1 Department of Hydrogeologye UMR 7185, University of Poitiers, France
2 Department of Hydrogeologye UMR 7185, University of Poitiers, France
3 Department of Hydrogeologye UMR 7185, University of Poitiers, France
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The Chari-Baguirmi aquifer, located East of Lake Chad, is the main source of water in this region. The groundwater piezometry is marked by a large depression. The work presented here aims to understand the development of this depression. The approach is based on a sedimentological study coupled to a hydrogeochemical study of the groundwater. The sedimentological analysis revealed the grain size heterogeneity of the different layers. Clay mineralogy showed that the deposition of sediments takes place from the periphery to the center of the depression. This sedimentation mode suggests the existence of a morphological cuvette to which sediments are driven by the transport agent. We deduced the existence of a "structural" depression unlike the common assumption of an origin due to accentuated evaporation of the groundwater over the depression area. The combined study of chloride and oxygen-18 has shown that the area between Lake Chad and the piezometric depression is a special evaporation zone. This means that the process of evaporation of groundwater does not occur mainly in the center of the depression. The first results of this work provide new insights into the functioning of this important aquifer system and the establishment of the large Chari Baguirmi piezometric depression.
Author Keywords: Lake Chad, Chari Baguirmi aquifer, piezometric depression, structural depression, hydrochemistry, isotopes.
How to Cite this Article
Hamit ABDERAMANE, Moumtaz RAZACK, and Claude FONTAINE, “Analysis of the Chari Baguirmi piezometric depression setting up (East of lake Chad) using a coupled sedimentology - geochemistry approach,” International Journal of Innovation and Applied Studies, vol. 18, no. 3, pp. 885–903, November 2016.
