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Coastline evolution of the Portuguese south eastern coast: a high-resolution approach in a 65 years’ time-window
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Authors
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Abstract(s)
Abstract. The coast, as the interface between land and sea, is a highly dynamic area, endangered by erosion and flooding, particularly at times of sea-level rise. At the present context of climate change, the use of scientific knowledge to understand coastal dynamics and coastal evolution assessment through time is essential to find a suitable management response for a successful adaptive coastal governance. It is proposed that the obtained high-resolution and long-term coastline change dataset is of crucial impor tance to improve the knowledge on mesoscale evolution of the Portuguese south-eastern coast, from Ancão to Vila Real de Santo António (VRSA), a 55 km long coastal stretch. The evolutionary trend, from 1950 to 2015, points to a general seaward progradation at the western (Barreta island) and eastern (Cacela peninsula – VRSA) sectors, and mostly an erosional trend at the central barrier island system (Culatra, Tavira and Cabanas islands). Moreover, a considerable average landward displacement of approximately 130 m is observed at Cabanas
island. Regarding overall coastline movement, seaward displacement prevails, with a prograding coastline occupying approximately 54% of the studied sector even though this is mostly associated with human intervention on the coast. The exception is the Manta Rota - Monte Gordo sector where accumulation is likely related to natural processes. Considering the significant influence man-made interventions have had on the coastline evolution, it is believed that the natural evolutionary pattern would point to an overall erosional trend in the islands sector and a progradational trend from Manta Rota to VRSA beach.
Description
Keywords
Coastline evolution mapping Coastal erosion and accretion Barrier islands SE Portuguese coast Algarve Digital shoreline analysis system (DSAS)
Citation
Nave, S., Rebêlo, L. Coastline evolution of the Portuguese south eastern coast: a high-resolution approach in a 65 years’ time-window. J Coast Conserv 25, 7 (2021). https://doi.org/10.1007/s11852-020-00791-3
Publisher
Springer