Comparative characterization of some physico - chemical and hydromorphological parameters from three rivers of Gabon: Rembo Bongo, Ogooué and Nyanga

Abstract

A comparative study on the characterization of the physicochemical and hydrodromorphological parameters of the rivers Ogooué, Rembo Bongo and Nyanga in Gabon was carried out in order to understand the structure of their operation on the one hand and to assess their ecological status on the other hand. The study showed that the Ogooué River is very different from the other two by its depth, the speed of its current, its total hardness and the structure of its sediments. The Rembo Bongo River and the Nyanga River contain over 55% sand. But the Nyanga River is richer in sandstone (26%).In general, the physicochemical parameters of the three rivers are within the limits of the desired values for a better growth of many fish and other aquatics organisms. Overall, the waters are relatively well oxygenated, are weakly mineralized and are sufficiently transparent with a low concentration of nitrogen and phosphate nutrients, thus translating a stable ecological state of the three rivers.