Por Cesária Gomes (IDL / FCUL).

Abstract: This work investigates the sediment dynamics of Boa Vista island (Cabo Verde) evaluating sediment sources, transport processes and sediment sinks, to understand coastal evolution. Dune and beach sedimentary characterization (textural and compositional) was coupled with recent coastal evolution patterns, deduced from multitemporal remote sensing data, island morphology and prevailing waves and winds. Results indicate the existence of a net north to south sand transport but with considerable differences between the sediment transport processes and paths around the island. On the western side sediment transport is dominated by overpass (wind action) while on the eastern side headland bypass (wave action) prevails. At the western side of the island the estimated magnitude of overpass transport closed matches the sedimentary sink related with coastal progradation, enabling a first quantitative assessment of Boa Vista sedimentary budget.