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Identification of Groundwater Potential Zones in Samendeni Watershed in Sedimentary and Semi-Arid Contexts of Burkina Faso, Using Analytic Hierarchy Process (AHP) Method and GIS

引用

American Journal of Climate Change 2023年第1期12卷 172-203页

作者： sadraki yabre Youssouf Koussoubé Sauret Élie Serge Gaëtan Nicaise Yalo Stephen Silliman West African Science Service Centre on Climate Change and Adapted Land Use (WASCAL) Doctoral Research Program in Climate Change and Water Resources Institut National de l’eau Université d’Abomey Calavi Cotonou Bénin Laboratoire Géosciences et Environnement (LaGE) Département des Sciences de la Terre Université Joseph KI-ZERBO/Unité de Formation et de Recherche en Sciences de la Vie et de la Terre Ouagadougou Burkina Faso Centre National de Recherche Scientifique et Technologique Institut de l’Environnement et de Recherches Agricoles-Département Gestion des Ressources Naturelles/Systèmes de Productions DRREA-Ouest Station de Farako-ba Bobo-Dioulasso Burkina Faso Laboratoire d’Hydrologie Appliquée (LHA) Institut National de l’eau Université d’Abomey Calavi Cotonou Bénin School of Science Technology Engineering and Math Trevecca Nazarene University Nashville Tennessee USA

Demand for water increases in Samendeni regarding the undertaken agricultural projects while pressure on surface water from global warming/evapotranspiration also increases. Thus, the need to evaluate the groundwater potential in the catchment is crucial as alternative supplier of water and resilience to climate hazards. The AHP was performed integrating ten influencing factors such as geomorphology, geology, soil, land use/land cover (lulc), slope, rainfall, drainage density, borehole rate & depth and piezometric level to generate groundwater potential zones (GWPZs) in Samendeni watershed (4420 km2). All the factors were processed and ranged into five (5) classes. Weight was assigned to each class of thematic layer. These thematic layers were then reclassified based on the normalized weight to be used in the calculation of groundwater potential zones (GWPZ). The final output, groundwater potential map, revealed a significant groundwater potential with very good (11%), good (31%), moderate (30%), poor (20%), and very poor (8%) of proportion. The interesting (very good, good) GWPZs in the study area are mostly in the central towards the east. The poor zones in term of groundwater potential are concentrated in the upper west region of the watershed. Besides the cross-validation with the relationship between different groundwater potential zones and the wells available in the study area, the overall accuracy was estimated to 88% provided from the result of the similarity analysis where 22 out of the 25 validation wells match with the expected yield classes of GWPZs. The statistics from that validation revealed the performance of AHP method to delineate groundwater potential zones at catchment level.

关键词： Climate Change Resilience Groundwater Potential Water Management Conjunctive Use AHP GIS Samendeni Watershed

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