Quantificação e cartografia da extensão de inundação costeira em Bissau, Guiné-Bissau: perspetiva em cenário de alterações climáticas

• Autor(a) principal: Fandé, M. B.
• Data de Publicação: 2020
• Outros Autores: Ponte Lira, C., Antunes, C., Penha-Lopes, Gil
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10451/46297

Coastal flooding (CF), enhanced by climate change, is one of the most significant impacts of sea level rise (SLR). Bissau city, home to ~25% of Guinea-Bissau population is already affected by CF due to tides and storms. It is anticipated that the situation will deteriorate in coming decades with the expected scenarios of SLR. This article evaluated the vulnerability to coastal flooding of Bissau, using the single-value model, which considers two variables: inundation value and a topographic surface. The inundation value, here referred as total water level (TWL) was estimated by the sum of three vertical components: astronomical tide (AT), storm surge (SS) and the SLR estimation for the considered scenario. Thus, the inundation extension was quantified and mapped using a TWL estimated for the year 2100, and a high-precision global Digital Elevation Model (DEM – TanDEM-X) of the Bissau region. The results indicate that the land potentially to be flooded corresponds to 29.3% of the study area (94.9 km²). The Southwest zone of Bissau presents greater exposure to flooding, due to its low altitude. Also, the disorderly anthropogenic occupation of flooded lands, makes these areas more vulnerable in a climate change scenario.