Un engraissement côtier résultant de l’érosion des bassins-versants cultivés: exemple de la baie du Galion à la Martinique

摘要

The progradation of the shores of the Gallon Bay (Martinique) has been measured based on diachronic mapping analysis. The sedimentary volume which accumulates along the coast and in the bay (under the water surface) is unknown. Erodibility has been surveyed on a square meter scale and extrapolated to the watersheds. The results show that most sediments originate from the farmed surfaces, they are then entrained by the runoff and the Gallon river and deposited along the coast, where the bathymetry and currentology of the bay facilitate sediment retention. The harmful effects of anthropogenic influence in the area are discussed.