Coastal Zones

Biography

Biography: Moussa Djara BIO

Abstract

This work was conducted as part of a doctoral thesis on the dynamics of the Benin coast and the geometry of the shore monitoring activities in the morphodynamics of a sediment cell initiated by the Geology Laboratory of Environment and Mine University of Abomey in collaboration with the Directorate of Land des Berges Coast and the Ministry in charge of managing and Côtes du Littoral. It aims to control the geometry of the relative sensitivity of the shore-side segment in time. The iconographic material used in this work consists essentially of pictures Landsat satellite, the iconographic material used for the analysis of changes in plaque morphology and those of the shoreline coast segment. They come from stock footage catalogs from instruments of TM (Thematic Mapper), ETM + (Enhanced Thematic Mapper Plus) satellites Landsat 4, 5 and 7 and LC8 (Continued Landsat). They are already orthorectified and projected in UTM / WGS84 projection system and each is accompanied by metadata specifying the acquisition parameters, the type of sensor, the satellite type, date, etc. The results lead us to distinguish that the stretch of coast between Djondji and Djègbadji, belongs to the Central unit. The analysis of the kinetics of the coastline distinguishes two segments: the segment of Djondji-Meko Meko and that of the South-Djègbadji Ouidah. • The coast between Djondji and Meko This segment of coast evolves today in a context of erosion with neighboring -1 m / year speeds (11 meters in 13 years). This evolution is linked to the instability of the mouth of the King since the implementation of the service Nangbéto dam on the Mono river. • The coast of Meko-Djègbadji south of Ouidah This coast is experiencing a segment globally fattening at a neighboring average rate of 1m / year (16 m in 13 years). This development confirms that the sector Meko coast to the East belongs to the transition zone / accretion of the Centre's cell. Climate change is one of the aggravating factors and evolution of the phenomenon of coastal erosion in the coast sector in the past two decades were considered stable coast sector. In the absence of adaptation measures for the next twenty five years, and Djondji Meko coast segment will suffer a decline of about one hundred fifty (25) meters. An estimate of the widths and strips of land surfaces eroded and a financial assessment of soil loss horizons to 25 years were made.