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Determinação de Faixas de Salvaguarda considerando diferentes cenários de Subida do Nível Médio do Mar e impactos associados: O Caso de estudo da Arriba da Bafureira
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Este relatório resulta das atividades desenvolvidas durante um estágio realizado no Laboratório CoLAB +Atlantic entre Outubro de 2022 e Abril de 2023, , durante o qual se tentou recolher o máximo de informação possível sobre as condições fisiográficas e topográficas existentes na Arriba da Bafureira, de forma a compreender o tipo de instabilidades, caracterizando a evolução morfológica, para um período compreendido entre 1995 e 2021, incluindo a quantificação das áreas horizontais da crista perdidas, o respetivo ritmo de recuo e, ainda a projeção das faixas de salvaguarda para os anos de 2050 e 2100 e a identificação dos elementos expostos.
Posto isto é importante salientar que as arribas possuem instabilidade e um risco associado que, com o desenvolvimento das comunidades junto a estas estruturas, não só aumenta, como também todos os parâmetros acoplados ao fator risco (exposição e vulnerabilidade). A arriba da Bafureira (Concelho de Cascais) foi identificada, através do Plano Nacional de Ação Litoral XXI como de prioridade de intervenção “Elevada” para a sua estabilização.
Os resultados revelam que este local apresenta um ritmo de recuo de cerca de 0,10 m/ano, com um deslocamento horizontal médio de 2.9 m colocando diversas infraestruturas em risco caso este ritmo se mantenha constante.
This report is the result of activities carried out during an internship at the Atlantic CoLAB+ Laboratory between October 2022 and April 2023. During this period, efforts were made to gather as much information as possible about the physiographic and topographic conditions existing at the Bafureira Cliff, to understand the type of instabilities characterizing its morphological evolution for a period between 1995 and 2021. This includes quantifying the lost horizontal crest areas, their respective rate of retreat, projecting safeguard ranges for the years 2050 and 2100, and identifying exposed elements. Having said that, it is important to emphasize that the cliffs have instability and an associated risk that, with the development of communities near these structures, not only increases but also all the parameters linked to the risk factor (exposure and vulnerability). The Bafureira cliff (Cascais Municipality) has been identified, through the National Coastal Action Plan XXI, as a 'High' priority for stabilization intervention. The results reveal that this location is experiencing a retreat rate of about 0.10 meters per year, with an average horizontal displacement of 2.9 meters, putting several infrastructures at risk if this rate remains constant.
This report is the result of activities carried out during an internship at the Atlantic CoLAB+ Laboratory between October 2022 and April 2023. During this period, efforts were made to gather as much information as possible about the physiographic and topographic conditions existing at the Bafureira Cliff, to understand the type of instabilities characterizing its morphological evolution for a period between 1995 and 2021. This includes quantifying the lost horizontal crest areas, their respective rate of retreat, projecting safeguard ranges for the years 2050 and 2100, and identifying exposed elements. Having said that, it is important to emphasize that the cliffs have instability and an associated risk that, with the development of communities near these structures, not only increases but also all the parameters linked to the risk factor (exposure and vulnerability). The Bafureira cliff (Cascais Municipality) has been identified, through the National Coastal Action Plan XXI, as a 'High' priority for stabilization intervention. The results reveal that this location is experiencing a retreat rate of about 0.10 meters per year, with an average horizontal displacement of 2.9 meters, putting several infrastructures at risk if this rate remains constant.
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Cascais Erosão costeira Ritmo de recuo Projeções para 2050 e 2100 Faixa de salvaguarda Coastal erosion Rate of change Projections for 2050 and 2100 Safeguarding coastline