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Dynamics and Vulnerability of Hydrogeomorphological Units to the Degradation of Climatic Conditions in the Watershed of the Birnin Lokoyo Pond (Iullemmeden Basin, Southwestern Niger)

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Journal of Environmental Protection 2022年第2期13卷 233-260页

作者： Karimou Dia Hantchi Bouba Hassane Habsatou Ousmane faraâtou issa saley balla Moussa Konaté Zibo Garba Department of Geology Faculty of Science and Techniques Dan Dicko Dankoulodo University Maradi Niger Department of Geology Faculty of Science and Techniques Abdou Moumouni University Niamey Niger Department of Digitization of Environmental Sciences Faculty of Science and Techniques University of Dosso Dosso Niger

The present study concerns the lowlands of the Birnin Lokoyo watershed located in the Matankari Rural Commune (Southwestern borders of the large Iullemmeden basin in the Niger). Dominated by the Birnin Lokoyo pond, this watershed faced with the continuous silting up of the minor bed, dissipates further upstream in the east, so that it moves downstream to the west for the benefit of the populations of Matankari city. The main objective of this work is to analyze the representative elements of the new climatic and environmental situation as well as the various factors determining the surface conditions in the watershed. The methodological approach is based on documentary research, field observations, individual surveys and interviews with targeted groups. The results show that the silting up of the lowlands is the result of the concomitant degradation of the plant cover and the soils, which, as a result, triggered the development of crusting surfaces and area erosion on the slopes. The study underlined the importance of endogenous knowledge in the choice of remedies against the silting up of lowlands. In addition, rational land management practices on plateaus and structures (within the watershed) do not seem to be in phase with topographical factors and the tectonic framework. This work is part of the vision of better management of glacis on the banks, but also of sills subject to regressive erosion upstream and in order to guide the policies of resilience of the populations.

关键词： Niger Birnin Lokoyo Wetlands Hydroclimatic Variability Soil

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Application of a Multi-Criteria Approach for the Assessment of Groundwater Potential in the Basement Zone: A Case of Tamou (South West Niger)

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International Journal of Geosciences 2023年第1期14卷 1-18页

作者： Saidou Garba Inaytoulaye Abdel Kader Hassane saley Issoufou Sandao issa Garba Department of Geology Groundwater and Georesources Laboratory Faculty of Sciences and Technology Abdou Moumouni University of Niamey Niamey Niger Department of Computer Sciences and Research Agrhymet Regional Center Niamey Niger

The commune of Tamou, located in the Department of Say in Niger, occupies the southwestern part of the Liptako crystallophyllian basement domain. In this area, the problem of the drinking water supply of the populations is acute, because of the low flow rates of the drillings capturing the crystallophyllian formations and the Voltaian sandstones, the failure rates of the drillings are very high there. Therefore, the main objective of this study is to improve the knowledge of the areas potentially favorable for the implantation of drillings likely to give more satisfactory flow rates. The methodological approach, based on the collection of data (Landsat 7 ETM+ satellite imagery, borehole data, geological and topographical maps) and their processing by a combination of remote sensing and GIS tools and a field check, allowed the elaboration of maps of availability, accessibility and exploitability of the groundwater resources in the study area. The maps developed were analyzed with a Spatial Reference Hydrogeological Information System following the technique of aggregation by weighting to generate the map of productive drilling sites. The results show that the area is moderately rich in groundwater (58%) and that only 31% of the potential is exploitable. The groundwater potential map shows that 46% of the study area is suitable for drilling.

关键词： Multi-Criteria Analysis Remote Sensing GIS Discontinuous Aquifers Tamou Niger

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