Etude geomorphologique du littoral de la sierra leone
Institution:
Université Louis Pasteur (Strasbourg) (1971-2008)Disciplines:
Directors:
Abstract EN:
This thesis is devoted to the coastal geomorphology of sierra leone in west africa. Its primary aim is a comprehensive analysis of the morphodynamic framework within which holocene coastal geomorphic units operate. It provides a data base for the protection and rational management of coastal resources. The main geomorphic units are a low coastal terrace of early holocene age emplaced by sheetwash processes on a poorly vegetated surface, prograded beach ridges and mangrove-colonized wetlands that are partly chenier plains. The thesis examines the morphodynamics of coastal progradation and proposes models of quaternary sedimentation and shoreface translation during the holocene.
Abstract FR:
Cette these est consacree a une analyse geomorphologique du littoral de la sierra leone, en afrique de l'ouest. Son but principal est de caracteriser le contexte morphodynamique dans lequel evoluent les unites geomorphologiques. Ces unites sont une serie d'epandages sablo-argileux qui affleurent en bas plateaux, des cordons littoraux, des vasieres a mangroves et de grands complexes estuariens. La these examine les processus de progradation littorale et propose des modeles de sedimentation quaternaire littorale et marines. Les resultats proposes dans la these sont egalement destines a servir de base pour des amenagements futurs.