DOI: 10.22161/ijeab/2.4.20

Abstract: These last decades, the exploitation of the inlands valleys increased considerably in number and surface because of the fertility of their soils and their hydromorphycharacter. The present article aims to analyze the potential in inlands valleys in the south of the Otibasin pouring. The methodological approach rests on the semiautomatic method that took in account the indications of vegetation (NDVI, NDWI, TWI) and the parameters (slope and accumulation of water) generated from the pictures Landsat OLI and ASTER DEMS. Besides the characterization of the inland valley inventoried has been based on the cutoff phytogeographical, on the biophysical and socioeconomic data of the basin. The achieved analysis multi criteria permitted to estimate the surface of the inlands valleys identified to 359 894,92 ha is 44,79% of the total surface of the south part of the Oti basin pouring. About 28698 flexible inlands valley covering a surface of 53 588,06 ha have been inventoried and represent about 6,67% of the total surface. Also, it is noted that 6,33% of the surface of the inlands valley inventoried by the semiautomatic method, either 42,52% of the potential in flexible inlands valleys are known by the local authorities of the Townships of the departments of the Atacora and the Donga. To the total, three types of inlands valleys came out again after characterization. It is about the inlands valleys of the massive atacoriens (BFMA), the inlands valleys of the wavy peneplain (BFPO) and the inlands valleys of the gourmaplain (BFPG). The exploitation rational of these shallows became unavoidable considering the present necessities and for the future agricultural perspectives.

Keywords: Oti basin pouring, inland valley, inventory, cartography, characterization.

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