Coastal erosion risk assessment to discuss mitigation strategies: Barra-Vagueira, Portugal
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Coastal erosion risk assessment to discuss mitigation strategies: Barra‑Vagueira, Portugal A. M. Ferreira1 · C. Coelho1 · P. Narra1 Received: 16 March 2020 / Accepted: 26 September 2020 © Springer Nature B.V. 2020
Abstract Worldwide coastal zones present serious erosion problems that cause loss of territory. This phenomenon exposes people and goods to the threat, being necessary to carry out a wellfounded management of these areas. Coastal erosion risk assessment methodologies are an important tool for coastal management. The main goal of the present study was to evaluate and discuss coastal management strategies based on the application of a methodology of coastal erosion risk classification, allowing easy comparison of scenarios. The study was developed for the Portuguese coastal stretch Barra-Vagueira. CERA methodology and its plugin for QGIS software were applied in order to assess the erosion risk of Barra-Vagueira stretch for different coastal erosion mitigation scenarios. First, an analysis of the coastal erosion risk was carried out based on bibliographic elements and present situation characterization. Subsequently, the erosion risk was assessed considering defence, relocation and nourishment strategies scenarios and climate change scenarios. The study based on bibliographic elements shows that the coastal region between Barra and Vagueira has a high risk of coastal erosion. Generally, the different scenarios tested represent variations on coastal erosion risk classification, allowing a simple first approach to evaluate coastal erosion mitigation scenarios, helping planning and decision-makers. Performing measures that allow to constrain the shoreline retreat, as artificial nourishments, leads to greater benefits in reducing the area of the territory classified with higher risk. New coastal defence structures allow to mainly decrease the stretch’s susceptibility to coastal erosion. The relocation of population leads to a decrease in the area of the territory classified as very highrisk. Climate change increases the erosion risk. Keywords Hazard · Coastal zones management · Climate changes · CERA · Coastal interventions
* A. M. Ferreira [email protected] C. Coelho [email protected] P. Narra [email protected] 1
RISCO and Civil Engineering Department, Aveiro University, 3810‑193 Aveiro, Portugal
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Vol.:(0123456789)
Natural Hazards
1 Introduction Coastal areas are very attractive zones for people and goods to settle due to the diverse opportunities provided by recreational and economic activities. It is estimated that 50% of the world’s population is currently living at less than 60 km far from the coast (Dias et al. 1994, 2009). On the other hand, these territories are dynamic ecosystems, being observed all over the world that these areas experience serious erosion problems, representing a general situation of shoreline retreat (Roebeling et al. 2011). The coastal erosion phenomenon is reflected in the loss of territory and is due to several factors related to sedimentary deficit of
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