Papers by Rabilou Abdou Mahaman
Paleochannel groundwater discharge to the River Niger in the Iullemmeden Basin estimated by near- surface geophysics and piezometry
Environmental Earth Sciences, Apr 18, 2023
Groundwater quality and its implications for domestic and agricultural water supplies in a semi-arid river basin of Niger
Environmental Earth Sciences
Paleochannel groundwater discharge to the River Niger in the Iullemmeden Basin estimated by sub- surface geophysics and piezometry mapping
In drylands groundwater is often the only perennial source of freshwater to sustain domestic wate... more In drylands groundwater is often the only perennial source of freshwater to sustain domestic water supplies and irrigation. Knowledge of the pathways and dynamics of groundwater discharge and recharge is essential to inform sustainable and rational management of limited water resources. The lower valley of the Dallol Maouri in Niger represents a large fossil tributary (i.e. paleochannel) of the River Niger and drains groundwater regionally from the Iullemmeden Basin through coarse-grained Quaternary sediments. The objective of this paper is to quantify groundwater discharge within this paleochannel using piezometry and surface geophysics (TDEM : Time Domain Electromagnetic, MRS : Magnetic Resonance Sounding). TDEM and MRS experiments were conducted at 21 sites along 3 transects show respectively the mean thickness of Quaternary alluvium varies from 11 m to 18 m with the effective porosities ranging from 20% to 33% and hydraulic conductivity of 2 × 10-3 m/s. Dense piezometric surveys...
Changes in aquifer properties along a seasonal river channel of the Niger Basin: Identifying groundwater recharge pathways in a dryland environment
Journal of African Earth Sciences
European Scientific Journal, ESJ
L’état de surface de la zone sahélienne a subi plusieurs mutations ces dernières années suite au ... more L’état de surface de la zone sahélienne a subi plusieurs mutations ces dernières années suite au changement climatique et aux activités anthropiques, ce qui amplifie les évènements extrêmes. L’analyse de la dynamique d’occupation et d’utilisation des sols s’avère un outil excellent pour renforcer la résilience de la population. L’état de surface de la basse vallée du Dallol Maouri, qui constitue un affluent fossile du fleuve Niger, a subi plusieurs modifications depuis les années 70. L’objectif de cet article est d’évaluer l’impact de la dynamique d’occupation des sols sur la hausse du niveau piézométrique de la nappe libre de la basse vallée du Dallol Maouri. L’analyse de la dynamique d’occupation et d’utilisation des sols montre une nette régression de la classe de savanes arborées et arbustives, et nette progression de mosaïque cultures-jachères. La classe des savanes arborées et arbustives, qui était largement représentée dans cette région, a perdu 61 % de sa superficie en 42 ...
Uploads
Papers by Rabilou Abdou Mahaman