Spatial Dynamics And Risks Analysis Of Lowlands Degradation Potential Around Of Nakanbé-Dem Sub-Watershed In Center-Nord Of Burkina Faso (West Africa): Through Multi-Date Study And Satellite Tele-Analysis

Abstract

Watershed degradation is a key issue for environmental change in the Sahel region and causes an unprecedented threat to the lowlands watershed and the livelihood of local people. This study analyzes the spatial dynamics and degradation risks of Nakanbé-Dem sub-watershed lowlands'potential. The study combines lowlands plants species assessment and digital processing. Lowlands spatiotemporal dynamics were assayed from landsat images of 1986, 1996, 2006 and 2016. Vegetation data and soil physical and chemical parameters allowed to characterize lowlands degradation states. Lowlands degradation risk assessment is based on flora analysis and remote sensing indices (Normalized Difference Vegetation Index, Normalized Difference Water Index, slope values and water accumulation zones). Spatio-temporal dynamics analysis between 1986 and 2016 showed a continuous degradation of Nakanbé-Dem lowlands potential. The coverage of farming land increased from 31 to 51% compared to the total lowland potential of 43320 ha. The riparian formations have decreased by 4.11% in the same period. As concerns the lowland beds, their coverage rate has continuously decreased from 24% in 1986 to 7.79% in 2016. The coverage rate of water bodies has not kept a linear evolution. It went from 2.27 to 2.62%, a slight increase of 0.35%. Soil and flora samples were taken from the three lowland geomorphological subunits: glacis, hillside and the central

Structural Controls of the Expansion of Small‐Scale Artisanal Gold of Bouda Area (Kaya‐Goren Green Belt, Burkina Faso) From Remote Sensing

“…The geodynamic setting is still debated and implies either oceanic plateaus related to a mantle plume (Augustin & Gaboury, 2017; Baratoux et al., 2011) or volcanic island arcs (Baratoux et al., 2011; de Kock et al., 2012; Ganne et al., 2012; Ilboudo et al., 2020). The belts are essentially made up of metavolcanic rocks, ranging from metabasalts to metarhyolites and metasedimentary rocks, including quartzites and metapelites (Baratoux et al., 2011; Ilboudo et al., 2017, 2020). The greenstone belts are the most prolific for gold and base metals, which are mainly structurally controlled (Augustin & Gaboury, 2017; Baratoux et al., 2011; Goldfarb et al., 2017; Markwitz et al., 2016; Masurel et al., 2022).…”

“…Still, they are covered on the country's western, northern, and eastern margins by Neoproterozoic to Cambro-Ordovician formations of sedimentary rocks (1,000-435 Ma). The geodynamic setting is still debated and implies either oceanic plateaus related to a mantle plume (Augustin & Gaboury, 2017;Baratoux et al, 2011) or volcanic island arcs (Baratoux et al, 2011;de Kock et al, 2012;Ganne et al, 2012;Ilboudo et al, 2020). The belts are essentially made up of metavolcanic rocks, ranging from metabasalts to metarhyolites and metasedimentary rocks, including quartzites and metapelites (Baratoux et al, 2011;Ilboudo et al, 2017Ilboudo et al, , 2020.…”

Dynamique de la Macrofaune des Bas-fonds Soundano – saheliens dans un Contexte de Changement Climatique: Étude de cas dans le Sous-bassin Versant du Nakanbé-Dem au Centre-nord du Burkina

“…La pression foncière sur les bas-fonds est telle qu'il faut désormais concilier l'exploitation et les fonctions des bas-fonds afin d'améliorer leur capacité à fournir des avantages et des services écosystémiques aux communautés locales. Cette pression est particulièrement importante dans le sous-bassin versant du Nakanbé-Dem où la pauvreté de la biodiversité faunique et l'absence de zones de protection de la flore se sont accentuées ces dernières années (Ilboudo, 2020). La faune du sol, sensée contribuer à sa fertilité en a été fortement réduite.…”