Kertemar Doudje

Morphodynamic study of the banks of the Chari and Logone rivers in N'Djamena Kertemar Doudje

This work is set on the banks of the Chari River in N'Djamena. Inscribed in the sandy-clay soils of the Holocene. It deals with the geomorphological adjustments of the banks of a low energy hydrosystem. The changes undergone are induced by intrinsic and / or extrinsic factors. Although they correspond for the most part to Holocene and Quaternary morphoclimatic legacies, the characteristics of the valley are determined by the regional morphostructural system. Elaborated in the whole river studied, the figures, the sections and the topographic profiles built and of the flows of the major bed show that their variations explain in great part the upstream-downstream changes of the forms of the bed and the characters of the fluvial dynamics. The study of the Holocene fluvial dynamics shows that the present morphological structure of the alluvial plain was definitively acquired in the Quaternary.