Ramos Pereira, A., Ramos, C., Trindade, J., Araújo-Gomes, J., Rocha, J., Granja, H., Gonçalves, L., Monge-Soares, A., Matos Martins, J., and Repositório da Universidade de Lisboa
Apresenta -se, de forma sumária, o Projecto fMi 5000 – Enviromental Changes: Fluvio -marine interactions over the last 5000 years (Projecto fCt nº: PtDC/Cte -GiX/104035/2008). Os ambientes estuarinos constituem uma das áreas mais sensí-veis, no quadro das alterações climáticas e da subida do nível do mar, porque se situam na interface entre as influências fluviais e marinhas e são o suporte, não só de áreas húmidas de grande biodiversidade, mas também de actividades económicas de importância estraté-gica. estes ambientes registam as mudanças do nível do mar e as modificações operadas nas bacias hidrográficas, quer naturais quer induzidas pela acção humana. Constitui objectivo deste projecto a avaliação do balanço entre as influências marinhas e fluviais, as respostas a eventos climáticos e o impacto das mudanças de uso do solo, numa janela temporal de 5000 anos. Os estuários escolhidos são o do rio neiva, do rio alcabrichel, na costa Ocidental de Portugal continental, e da ribeira de Bensafrim, no Barlavento algarvio., This paper presents the aims, the proposed methodology and the cases to be studied within the FMI 5000 – Environmental Changes: Fluvio -marine interactions over the last 5000 years (Project FCT nº: PTDC/CTE‑GIX/104035/2008). The estuarine environments are sensitive areas in the climate change and sea level rise framework, as they are in the interface between fluvial and marine dynamics. They are also strategic areas because of their great biodiversity and the various economic activities they support. These environments record the sea level changes as well as the changes in their drainage basin, whether they are natural or man induced. The goal of the project is to evaluate the balance between marine and fluvial influences, the answers to climatic events and the land use changes impacts, in a 5000 years’ time window. The estuaries of Rio Neiva, of Rio Alcabrichel and of Ribeira de Bensafrim were chosen to develop this research; the first two are located on the western coast and the third one in the Algarve southern coast., Le Projet FMI 5000 – Enviromental Changes: Fluvio -marine interactions over the last 5000 years (Projecto FCT nº: PTDC/CTE‑GIX/104035/2008) est presenté synthétiquement. Les environnements estuariens constituent l’une des zones les plus sensibles dans le cadre des altérations climatiques et de la montée du niveau de la mer, parce qu’ils se situent à l’interface entre les influences fluviales et marines, et sont le support, non seulement de zones humides de grande biodiversité, mais aussi d’activités économiques d’importance stratégique. Ces environnements enregistrent les changements de niveau de la mer et les modifications subies par les bassins hydrographiques, qu’elles soient naturelles ou induites par l’action humaine. Les objectifs de ce projet sont l’évaluation de l’équilibre entre les influences fluviales et marines, ainsi que l’impact des changements climatiques et d’occupation du sol, dans une fenêtre temporelle de 5000 ans. Les estuaires choisis sont celui du Neiva, celui de l’Alcabrichel, sur la côte occidentale du Portugal, et celui de la rivière de Bensafrim, dans l’Est de l’Algarve.