Artigos de Revista

Neste trabalho, descreve-se a aplica‡Æo do programa OSOM+ …s obras mar¡timas do Porto de Sines, em especial ao quebra-mar oeste. Assim, serÆo apresentados resultados de compara‡Æo entre as situa‡äes observadas em 2018 e 2020 no ƒmbito de inspe‡äes visuais e com drone, mediante aprecia‡Æo e an lise de fotografias georreferenciadas, ortomosaicos, nuvens de pontos, modelos num‚ricos de superf¡cie e perfis selecionados.  tamb‚m ilustrada a forma como a aplica‡Æo e base de dados ANOSOM-WEB pode ser empregue quer durante as campanhas de observa‡Æo, quer em gabinete. Conclui-se este trabalho com a apresenta‡Æo das vantagens da recente atualiza‡Æo da metodologia e do que se julga ser a sua importƒncia na tomada de decisäes sobre a necessidade ou nÆo de realizar obras de manuten‡Æo e/ou repara‡Æo nestas estruturas, ou similares

Performance assessment is an important management tool in the water sector, and its integration on storm water systems’ management is recognised to benefit storm water utilities. A performance assessment framework for urban storm water systems has been developed, comprising objectives, assessment criteria, and performance indicators. The objective of the present work is to test and demonstrate the applicability of the framework as part of the internal validation process. The framework components are evaluated in terms of their definition, relevance, and feasibility, in conjunction with their application to a case study, in an estuarine area served by conventional storm water systems, by developing a performance assessment system. The identified performance failures were related to flooding occurrences, illicit domestic connections to storm water pipes, insufficient hydraulic capacity, and lack of self-cleaning capacity. Different intervention solutions were studied based on the infrastructure asset management planning AWARE-P software. Suggestions to improve the system’s performance and to obtain data for non- calculated performance indicators were proposed.

The use of concrete materials in Portugal, namely reinforced concrete, began in the 19th century. However, during the 20th century, the increase in the application of this composite material, alongside the use of hydraulic binders, led to a disruption of traditional construction techniques and enhanced generalized application in concrete structures, combining aesthetics with functionality. In this paper, the authors will present and discuss several physical and mechanical characteristics of reinforced concrete materials from 12 award-winning architectural buildings constructed between the 1930s and the end of the 20th century in Lisbon, Portugal. These results are vital to evaluate their durability, as those buildings have an undiscussable heritage value in the context of 20th-century buildings

The National Laboratory of Civil Engineering (Portugal) is undertaking a characterization and feasibility study of a multifunctional submerged detached breakwater (SDB) in front of Praia da Vagueira, in the central West coast of Portugal, for the Portuguese Environment Agency, I.P. (APA). It is intended that the SDB is multifunctional, contributing to create conditions to promote surfing waves, boosting the economy associated with this activity in the area. A physical and numerical modeling study was developed to investigate the influence of a SDB (considering the SDB parallel to the coastline, SDB 0§, and the SDB with a 45§ angle to the coastline, SDB 45§) in the surfing conditions on the study area. The results show that: without structure, a spilling wave breaker occurs near the coastline, with peel angles adequate for beginners; for the SDB 0§ a plunging wave breaks along the structure, with small peel angles, not adequate for surfing; and for the SDB 45§ a plunging wave breaks over and past the structure, with peel angles between 40§-50§, promoting surfing conditions for intermediate and professional surfers.

Spillways are a requirement for dams

Spillways are a requirement for dams’ safety, mainly preventing overtopping during floods. A common spillway solution involves plunging jets, which dissipate a considerable flow energy in the plunge pool. Energy dissipation has to occur in a controlled manner to avoid endangering the dam foundation and river slopes. Indeed, a scouring process in the downstream riverbed will inevitably develop until equilibrium is reached, otherwise a suitable pre-excavated or concrete lined plunge pool has to be provided. This paper focuses on experimental studies in which particular attention was paid to the dynamic pressures in the plunge pool floor at the vicinity of the jet stagnation zone sampled at 2.4 kHz. A rectangular experimental facility, 4.00 m long and 2.65 m wide, was used as plunge pool. Tests involved a vertical circular plunging jet with velocity ranging from 5 to 18 m/s and plunge pool depth ranging from 4.2 to 12.5 jet diameters. Differences in dynamic pressure measurements are highlighted between transducers located in the inner and outer regions of the jet diameter footprint. Several parameters characterizing the dynamic pressures evidence trends tied with the jet velocity that, to the authors’ knowledge, were not dealt in previous research. These can derive from the coupling effects of consequent recirculating motions and air entrainment in the limited-size plunge pool. Both effects, increasing with velocity, cause an reduction in the efficiency of the diffusing jet shear layer. This aspect deserves further investigation to achieve a better understanding and more complete characterization.

Powdered activated carbon (PAC) dosing to a conventional activated sludge (AS) reactor is a low-investment option for controlling pharmaceutical compounds (PhCs) in municipal wastewater treatment, but its advantages and limitations in real operating environments are not fully assessed. A 3-week PAC-AS full-scale test was conducted in an oxidation ditch plant to assess PAC impact on effluent quality (PhCs, dissolved organic carbon (DOC) and other parameters), energy consumption, sludge production and costs. DOC-normalized PAC doses of 0.7–2.6 mgPAC/mgDOC significantly reduced recalcitrant PhC discharge (e.g. by 63–83 % for carbamazepine and 67–69 % for diclofenac), the higher dose yielding a more reliable effluent quality. Effluent quality for total phosphorus, colour, organic matter and transmittance was also enhanced and no interference with nitrification, oxidation-reduction potential or dissolved oxygen in the oxidation ditch was observed, resulting in no energy consumption increase. PAC had no impact on effluent turbidity and mixed liquor suspended solids settleability, showing a positive effect on dewatered sludge dry weight and ultimately a 7–9 % increase on final sludge production. After stopping PAC dosing, PAC remaining in the return sludge presented adsorption capacity for some PhCs until it was completely out of the system. Estimated costs for PAC addition to AS-reactor compare favourably with literature data for PAC and GAC post-treatment and similarly with post-ozonation.

A previsÆo de galgamentos e inunda‡äes em zonas costeiras baseadas em metodologias num‚ricas, ‚ fundamental para a garantia da seguran‡a de pessoas e bens e para a gestÆo integrada da zona costeira.

To predict the structural behaviour of ancient stone masonry walls is still a challenging task due to their strong heterogeneity. A rubble-stone masonry modeling methodology using a 2D particle model (2D-PM), based on the discrete element method is proposed given its ability to predict crack propagation by taking directly into account the material structure at the grain scale. Rubble-stone (ancient) masonry walls tested experimentally under uniaxial compression loading conditions are numerically evaluated. The stone masonry numerical models are generated from a close mapping process of the stone units and of the mortar surfaces. A calibration procedure for the stone-stone and mortar-mortar contacts based on experimental data is presented. The numerical studies show that the 2D-PM wall models can predict the formation and propagation of cracks, the initial stiffness and the maximum load obtained experimentally in traditional stone masonry walls. To reduce the simulation times, it is shown that the wall lateral numerical model adopting a coarser mortar discretization is a viable option for these walls. The mortar behaviour under compression with lateral confinement is identified as an important micro-parameter, that influences the peak strength and the ductility of rubble-masonry walls under uniaxial loading.

Neste artigo, dedicado à temática de uma habitação intergeracional participada e naturalmente convivial abordam-se, sequencialmente, as seguintes matérias: a intimidade e a domesticidade em espaços habitacionais adequados a diversos grupos socio-etários; a convivialidade e a intimidade, aspetos essenciais a harmonizar nos espaços privados e comuns habitacionais; e questões associadas às temáticas, desejavelmente conjugadas, da domesticidade, da longevidade e da intergeracionalidade