Eco-Geomorphological mapping of the Camposoto Barrier System in Cadiz Bay, S Spain

Barrier systems are complex environments made up of various coastal sub-units that often include (from sea to land) the shoreface and beach, coastal dunes, and marshes. Barriers are shaped by diverse forces with sub-units reflecting the degree of wind and wave energy they are exposed to, sediment composition, and tidal regime among other aspects. This study delves into the eco-geomorphological complexities of the Camposoto barrier system in the Cadiz Bay area, S Spain. Employing satellite remote sensing, UAV multispectral sensors, and fieldwork, different eco-geomorphological units have emerged that challenge conventional delineations between sub-units and relative location to the shore. The Camposoto barrier system shows a general retreating trend, with erosion rates between 1 and 2 m yr-1, mostly linked to storm events and a lack of sediment supply. The system is intersected by multiple washover fans and is characterised by large differences in sediment sizes and composition, a bi-modal wind regime, and complex dune topography. Marsh vegetation can be found atop dunes, while coarse beach sediments infiltrate deep into the barrier. This gives rise to a mosaic of barrier environments and a complex interplay between barrier sub-units. This study's preliminary outcomes show the capabilities of remote sensing tools for coastal mapping and for refining our understanding of barrier environments and evolution.