MODELING THE EVOLUTION IN THE CONCENTRATION OF SOLIDS BASED ON RAINFALL OF THE MEWOU RIVER IN THE MIFI BASIN

Rainwater, charged with carbon dioxide and other elements passes through the atmosphere and the surface of the soil. It dissolves part of their minerals through this process and triggers a series of chemical phenomena, causing chemical weathering of rocks (Fournier, 1969). Thus, the dry rocky elements are fragmented, reduced to the size of sand, silt or clay. Erosion is a process that tends to reduce the surface of continents, the thickness of soil and rock, by physically pulling the solid particles that are exported suspended by surface runoff into rivers to reach the oceans and intra continental basins (Probst, 1992). Several authors see water erosion in the tropics from two angles: geological or normal erosion and accelerated erosion (El-Swaify et al., 1982). As a general principle, human activity is the main cause of erosion, as a result of deforestation, agriculture, livestock and urbanization. This is the origin of the presence of solid particles in streams creating the solid flow. This study aims at evaluating quantitatively and model of sediment as a function of precipitation.