Sand barrier development in the bight of Benin, West Africa
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The morphology, sedimentary facies, stratigraphy and development history of re-entrants and sand barriers in Togo and Benin (West Africa) have been analysed from boreholes and field data, and available radiocarbon dates. Re-entrant deposits range from basal Late Pleistocene fluviatile sands into Holocene estuarine and fluvio-deltaic sands. As sea level stabilized between 6000 and 5500 B.P., the "compartmented" coast associated with these reentrants favoured a polycellular longshore drift system. As the latter became infilled throughout the bight of Benin between 6000 and 4000 B.P., the littoral drift system evolved into a unicellular system fed by the Volta delta in Ghana, which has been the major sand source for an almost 300 kin long outer harrier. In spite of the massive and consistent volume of sand drifting eastward (1.2-1.5 x 10'6 m³/yr),progradation slowed down or ceased as equilibrium was achieved between coastal/shoreface geometry and the hydrodynamic regime, result.....
JournalOcean and coastal management
Spatial CoverageTogo littoral