107 documents found, page 1 of 11
Harnessing deep learning to monitor people’s perceptions towards climate change...
Cardoso, A. S.; Silva, C. da.; Soriano-Redondo, A.; Jarić, I.; Batel, S.; Santos, J. A.; Jorge, A.; Vaz, A. S.Social media has become a popular stage for people’s views over climate change. Monitoring how climate change is perceived on social media is relevant for informed decision-making. This work advances the way social media users’ perceptions and reactions towards climate change can be understood over time, by implementing a scalable methodological framework grounded on natural language processing. The framework w...
Future Projections for Wind, Wind Shear and Helicity in the Iberian Peninsula
Martins, Joana; Rocha, Alfredo; Viceto, Carolina; Pereira, Susana Cardoso; Santos, J. A.Wind is among the most important climatic elements. Its characteristics are determinant for a wide range of natural processes and human activities. However, ongoing climate change is modifying these characteristics, which may have important implications. Climatic changes on wind speed and direction, wind shear intensity, and helicity, over the 21st century and for 26 cities in the Iberian Peninsula, under the R...
Hydrological and flood hazard assessment using a coupled modelling approach for...
Fonseca, A. R.; Santos, M.; Santos, J. A.Floods may lead to destruction of property, to damage to the environment and ultimately to loss of lives. Although it is not possible to avoid them, they are enhanced by human activities that increase the probability of occurrence of these natural events. Preliminary flood risk assessment and determination of areas of potential significant flood risk is mandatory according to the European Floods Directive (2007...
Overtopping risk evaluation at the portuguese coast: Leixões, Lisbon/Caparica a...
Capitão, R.; Fortes, C. J. E. M.; Santos, J. A.; Poseiro, P.; Reis, M. T. L. G. V.; Pereira, T.To tackle recurrent emergency situations due to adverse sea wave conditions, often observed in Portuguese ports and coasts, a research project (HIDRALERTA) is underway to build a methodology and a system for long-term planning, wave climate forecast and early warning to be applied to those areas. This system deals with phenomena such as run-up, overtopping and flooding. lt wiII eventually empower the nationa! a...
Evaluation of wave overtopping consequences for risk assessment. The case study...
Lourenço, I.; Santos, J. A.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Garcia, T.; Poseiro, P.; Craveiro, J.This paper aims at presenting two diíferent methodologies to evaluale wave overtopping consequences: the Analytic Hierarchy Process (AHP) and the Analytic Network Process (ANP). The AHP is based on lhe comparison of successive and paired information that was selecled and quantified having in mind its hierarchic prioritization by taking into account lhe estimated relevance of each considered criterion or indicat...
Toe berm damage progression analysis using a stereophotogrammetric survey techn...
Pedro, F.; Bastos, M.; Lemos, R.; Fortes, C. J. E. M.; Santos, J. A.This paper focuses the toe berm damage progression analysis using image processing tools, in order to test their applicability to scale model tests. Damage can be characterized either by counting the number of displaced units or by measuring the eroded profile of the armor slope. Nevertheless, qualitative and quantitative damage assessment is not always easy. In order to ease and speed up those tasks, some imag...
Ship movements' analysis in a scale model
Simão, J.; Pinheiro, L.; Lesme, H.; Hinostroza , M.; Santos, J. A.; Fortes, C. J. E. M.A set of physical model tests was run in order to characterize the ship’s response to different wave conditions going from frequently-occurring conditions up to extreme ones. Several wave heights, periods and directions were generated. The waves around the ship were measured with probes and the movements of the ship were measured with a fiber-optic gyrocompass. Transfer functions are established and compared wi...
Application of stereo photogrammetry to physical scale model tests with mobile ...
Pedro, F.; Lemos, R.; Fortes, C. J. E. M.; Santos, J. A.The phenomenon of scour in the vicinity of coastal and harbour protection structures, wind farms, offshore platforms and marine outfalls is one of the causes associated with its collapse. During the design of such structures, the prediction of the maximum erosion depth located in the vicinity of the structure is of utmost importance, requiring, frequently, a validation by scale-model tests. The objective of thi...
Serum trace elements in dysphagic patients that underwent endoscopic gastrostom...
Santos, J. A.; Fonseca, J.; Carolino, Elisabete; Guerreiro, António SousaPatients who underwent endoscopic gastrostomy (PEG) present protein-energy malnutrition, but little is known about Trace Elements (TE), Zinc (Zn), Copper (Cu), Selenium (Se), Iron (Fe), Chromium (Cr). Our aim was the evaluation of serum TE in patients who underwent PEG and its relationship with serum proteins, BMI and nature of underlying disorder.
Climatic extremes in Portugal in the 1780s based on documentary and instrumenta...
Fragoso, Marcelo; Marques, D; Santos, J. A.; Alcoforado, Maria Joao; Amorim, I; Garcia, J. C.; Silva, L; Nunes, M. de F.The final stage of the Little Ice Age in Europe was characterised by strong climatic variability. New documentary sources containing information referring to weather and climate are used in this study to reconstruct and to describe climate conditions in Portugal during the 18th century, mainly in the 1780s. Indexation of documentary data concerning hydric and thermal conditions was based on C. Pfister’s methodo...