Artigos de Revista

The vegetation capacity to protect the coasts from wave action is becoming more important and attractive due to ongoing sea level rise and increasing storminess. In addition, it is a quite environmentally friendly way. Quantifying the vegetation effect in wave propagation will be relevant for coastal management. A non-hydrostatic wave model based on the nonlinear shallow water equations, SWASH, offers opportunities to quantify the wave dissipation effect in vegetation fields. However, limited applications of SWASH addressing this subject can be found in the literature and therefore it is important to enhance the existing knowledge on the model behaviour. In this research, in order to understand the characteristics of the SWASH model further, the model is applied to reproduce the significant wave height (Hs ) evolution over vegetation fields measured in flume experiments and in field campaign. Overall, SWASH performed very well in reproducing the Hs evolution measured both in the laboratory and in the field. In the case of flume data, the statistical scores MBE, RMSE and MRE, showed that the SWASH performance clearly improved when increasing the number of vertical layers assumed in the simulations. In the case of field data, considering a vegetation factor (Vf ) between 0.1 and 0.5, that represents the overall effect of scarcely known numerical vegetation parameters, led to a fairly good SWASH performance in modelling the Hs evolution over vegetation.

There is an increasing awareness and advocacy claim for engaging the society in the production of public openspaces. This contribution seeks to increase knowledge on the relationship between spaces and the social practicesof teenagers, towards a more inclusive and interactive process of public space co-creation. It is based on twoEuropean Projects: CyberParks and C3Places, and explores teenagers' spatial practice and needs, and how toengage them in the process of co-creating more sensitive public spaces, while exploring the challenges andopportunities ICT open. It this paper, the results of a case study taking place in Lisbon and the analysis ofquestionnaires and interviews are discussed.

O Porto de Leixões, localizado na costa norte de Portugal, é um dos maiores do país, recebendo diariamentevários navios de grandes dimensões. Um dos principais postos de acostagem situa-se à entrada do porto e encontra-se sujeito à agitação marítima que é difratada pelo olhe principal de proteção do porto. Para avaliar dos movimentos induzidos no navio estacionado nesse posto de acostagem e as forças exercidas nas suas amarras e defensas pela agitação incidente, utilizou-se o modelo físico de Leixões, construído num dos tanques do LNEC. Neste modelo físico, encontra-se representada a envolvente do porto de Leixões, assim como a sua batimetria. O modelo do navio

The Portuguese continental coastal zone is characterized by its lithological, morphological, biological and landscapediversity. With a coastline extension of approximately 987 km, this zone has great importance in the nationalcontext. The increasing anthropic occupation of the coastal zone in the last seven decades led to a conflict with thenatural dynamics of these areas. The project MOSAIC.pt emerges from the need of a comprehensive flood riskmanagement framework for the Portuguese coastal zones, including estuaries. One of the innovative challenges ofthis project is to identify the coastal critical typologies affected by flooding, based in historical data. Hence, ahistorical database of coastal flood occurrences was created for the period 1980-2018. Historical data was collectedin national and regional newspapers. The database includes relevant information such as flood triggering factors andimpacts. For the period 1980-2018, a total of 398 occurrences of coastal overtopping and flooding were identified.The analysis shows that the vast majority of occurrences are located on the Portuguese western coast. In terms ofimpacts, the typologies associated with material, natural, environmental and lastly human impacts stand out. Resultsprovide relevant temporal and spatial information about coastal historical flood occurrences and contribute for thedesign of a risk framework.

According to the United Nations, by 2030, 60% of the world

An air curtain is used to ensure an adequate separation between two compartments that is aimed torestrict, a clean one and a contaminated one. The air curtain performance is improved with the use of anair extraction from the “contaminated” compartment. The aerodynamic sealing of an optimized aircurtain is assessed regarding particulate matter. The evaluation using visual assessment of the aerody-namic sealing using a cold smoke source is validated against PM 10 detection.It is shown that the air curtain presents a good aerodynamic sealing for the particulate of PM10 and PM2.5classes and that the visual assessment method can lead to similar results. An equation was obtained with aview to be used to predict the level of aerodynamic sealing of the air curtain when the exhaust ratebecomes too low. Another equation was obtained for predicting the average velocity through the doorprotected by the air curtain required to obtain an aerodynamic sealing, as a function of the jet parameters(nozzle average velocity and thickness). These test results prove that the air curtain, complemented withan air exhaust from the “contaminated compartment”, is suitable to provide an acceptable aerodynamicsealing for the particulate matter.

No artigo a matéria global da caraterização das habitações térreas no que se refere às respetivas opções domésticas e urbanas é iniciada por uma reflexão sobre os diversos tipos de espaços domésticos que podem integrar edifícios, seguindo-se um enfoque específico no que pode ser uma habitação ligada ao espaço público e ao mundo térreo. Apresentam-se, em seguida, alguns aspetos ligados ao que se julga poder uma imagem urbana estimulante, marcando as relações habitação-rua e habitação-cidade e às vantagens do viver ao nível térreo. Finalmente desenvolve-se um conjunto de reflexões sequenciais sobre as tipologias habitacionais com acessos diretos ao exterior, sobre as respetivas ligações entre edifício e rua e, naturalmente, sobre o que tudo isto pode representar para o reforço da identidade habitacional.

The durability of pultruded GFRP composites is critical to their performance in civil engineering applications, for which comprehensive and validated data is limited. To address this issue, this study presents an extensive experimental programme on the effects of hygrothermal ageing on the performance of pultruded GFRP profiles made of two alternative resin systems – unsaturated polyester (UP) and vinyl ester (VE) – both comprising identical fibre architecture. The ageing environments included immersion in demineralised and salt water at three different temperatures (20°C, 40°C, and 60°C), and continuous condensation at 40°C, for durations up to two years. Physical, viscoelastic and mechanical (tensile, flexural, in-plane and interlaminar shear) properties were assessed after a desorption period. As expected, the VE profile had overall better performance than the UP profile. After 24 months, the highest reductions in tensile strength occurred for water immersion at 60°C, namely 45% and 33% for the UP and VE profiles, respectively. This paper provides a wealth of test data that can be used for degradation models for the prediction of their long-term mechanical property retention.