Browsing by Author "Freitas, J. G."
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- Contra a maré cremos,crianças, que basta edificar mais cubos e muralhas de areia: reflexões interdisciplinares sobre a gestão costeiraPublication . Freitas, J. G.; Dias, J.A.; Paula, D. P.; Cancela da Fonseca, Luis; Vasconcelos Júnior, R.; Schmidt, L.Este trabalho – que não é um artigo científico e por isso não segue a sua estrutura – reúne um conjunto de opiniões de vários investigadores que se dedicam ao estudo das zonas costeiras. A todos se pediu que reflectissem – com base na sua experiência pessoal e profissional – sobre a gestão actual deste espaço, partindo da frase do artista plástico Carlos Augusto Ribeiro, que serve de título a este texto. Aqui se discute sobre populações e saberes tradicionais, obras de engenharia costeira, gestão de conflitos, destruição de ecossistemas e insustentabilidade, necessidade de cooperação e conhecimento multidisciplinar, novos modelos de gestão do litoral e de cidadania.
- Extending the DPSIR framework to analyse Driver-Pressure-State-Impact-Response of sand dune management in Manawatu-Whanganui (New Zealand) since the 19th centuryPublication . Sampath, D. M. R.; Freitas, J. G.; Dias, JoaoCoastal sand dunes are multifunctional landscapes with rich biodiversity. In New Zealand, with the establishment of European settlement around 1840, dunes in the Manawatu-Whanganui region were affected due to the removal of their vegetation cover by human activities and animal grazing. As a result, sand drifted further inland affecting villages, infrastructure and agricultural areas. The main response was to introduce marram grass (Ammophila arenaria) used in Europe to stabilize dunes. This solution caused significant environmental impacts as marram grass turned invasive and native habitats of fauna and flora significantly decreased.This paper focused on the long-term analysis of aspects related to sand dune management in the region during two-time frames: 1) from the 19th to the late 20th century and 2) from then on to the early 21st century, using the innovative spiral DPSIR (Driver-Pressure-State-Impact-Response) framework. Data for this study comes from historical records, scientific literature and present management reports.The integrated spiral framework allows for establishing the connections between historical and future man-agement initiatives for mitigating and adapting to environmental impacts due to socio-economic drivers and their pressures. The study reinforces the paradigm shift from dune stabilization before the late 20th century to the restoration of stabilized dunes to make them active for enhancing native biodiversity should be again assessed in the context of sea-level rise during this century. Coastal managers should adopt an optimized solution between these two extreme solutions adopted from the 19th century to the present, by considering long-term and interdisciplinary analysis to better understand the systems' evolution and the full consequences of human actions.