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Mapping erosion risk under different scenarios of climate change for Aveiro coast, Portugal

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Abstract

Several coastal zones are facing shoreline retreat problems, losing territory due to energetic sea actions, negative sediment transport balances and climate change phenomena. To deal with this problem, efficient tools are necessary to help decision-makers choose the right procedures to follow. These tools should assess, estimate and project scenarios of coastal evolution in a medium-to-long-term perspective. To perform reliable projections, as many variables as possible should be analysed, and the impact of each of these variables on the shoreline evolution should be understood. This study aimed to analyse three climate change phenomena that are considered the most important in a Portuguese west coast stretch (at Aveiro region). The considered phenomena are the wave height increasing due to storms, the wave direction changes and the sea level rise. A shoreline evolution numerical model, long-term configuration, developed to support coastal zone planning and management in relation to erosion problems was applied. This work defined a methodology for classification of risk areas, considering the uncertainty associated with different wave climate sequences on simulations. As a result, different risk maps according to considered climate change effects were obtained, defining areas of high, medium and low risk of territory loss due to erosion. A generalized erosion tendency and shoreline retreat were observed, particularly in the downdrift side of groins. The sea water level rise showed lower impacts in the shoreline evolution than wave direction changes, or wave height increasing, which presents the highest impact.

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Acknowledgments

This work was supported by FCT (Fundação para a Ciência e Tecnologia) in the framework of the research project PTDC/AAC-CLI/100953/2008—ADAPTARia: Climate Change Modeling on Ria de Aveiro Littoral—Adaptation Strategy for Coastal and Fluvial Flooding.

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Authors and Affiliations

  1. Civil Engineering Department, University of Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal

    C. Pereira & C. Coelho

  2. CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal

    C. Coelho

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  1. C. Pereira
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  2. C. Coelho
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Correspondence to C. Pereira.

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Pereira, C., Coelho, C. Mapping erosion risk under different scenarios of climate change for Aveiro coast, Portugal. Nat Hazards 69, 1033–1050 (2013). https://doi.org/10.1007/s11069-013-0748-1

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