Artigos de Revista

The efficient planning of operation and maintenance (O&M) interventions and short-term investments requires adequate and tailored inspection protocols of existing infrastructures. The current study proposes a new standardized inspection system for periodic visual surveys of storage tanks and pumping stations of urban water infrastructures. The proposed system aims at identifying and classifying anomalies in terms of severity, intensity, and extension to evaluate the asset and its components deterioration. Inspection forms specific for water storage tanks and pumping stations are proposed. A set of 22 water storage tanks and 17 wastewater pumping stations located in Portugal were inspected using the developed system. Several anomalies

This paper presents a novel energy balance scheme tailored for assessing energy efficiency in wastewater systems. It provides a consistent method to calculate the energy components associated with wastewater transport processes, allowing the quantification of the main water-energy inefficiencies. Three assessment levels are described (macro, meso and micro-level), depending on available information and scope. This balance allows a holistic approach of wastewater systems energy efficiency, including the system layout, losses in pipes/manholes, energy associated with undue inflows, exceedance volumes and energy recovery. The energy balance is applied to realcase studies. The energy associated with undue inflows represents from 20% to 44% of the external energy, with low average efficiencies of wastewater pumping systems (34%) and inflow intrinsic energy representing 64% of the total energy. This energy balance supports the performance diagnosis and the development of energy efficiency improvement measures.

This study aims proposing a novel geometry of the onshore Oscillating Water Column (OWC) device to increase its efficiency. A comparison between standard OWC

This paper aims at compiling the most relevant information concerning the use of cement-based mortars and concretes in the rehabilitation, retrofitting, and strengthening of hydraulic structures, namely concrete dams. The most important properties of cementbased mortars and concretes as repair materials are addressed, with a special focus on its compatibility with the concrete substrate. After a brief allusion to generic preparatory works, some of the most common practices are described. The main topics are mortar and concrete toppings, i.e., patches and overlays and thickening of the dam section. Among overlays, shotcrete and underwater works are addressed in detail. Littlerock, Oberems, and Storfinnforsen dam interventions are briefly described as successful rehabilitations involving the shotcrete method, whereas the Albbruck-Dogern dam intervention is given as an example of effective underwater repair works. As for dam section modifications, Kölnbrein, Olef, and Sasanagare dams are presented as conventional mass concrete placements within rehabilitation operations, while Les Toules, Gibraltar, Santa Cruz, and Littlerock dams are references for roller compacted concrete strengthening.

A simple and consolidated reliability-based method widely used to unveil the real reliability and stability of wastewater treatment plants (WWTPs) is herein proposed to trigger decision making on operational improvements and asset management for maintaining or improving treatment effectiveness, reliability, and efficiency.

Urban drainage systems face intrinsic constraints related to the deterioration of infrastructure, the interaction between systems, and increasing requirements and stresses that lower the quality of provided services. Furthermore, climate change and the need for the efficient use of resources are providing additional pressures that cannot be addressed solely with

No presente texto desenvolve-se, em primeiro lugar, para uma reflexão global sobre as matérias ligadas a condições de acessibilidade residencial e de vizinhança urbana habilitadoras de um habitar adequado aos habitantes mais fragilizados.Numa segunda parte do texto avança-se para o aprofundamento da relação mútua entre condições expressivas de bem-estar residencial e urbana no envelhecimento humano e a existência de uma expressiva aptidão espacial, funcional e pormenorizada para a vida diária e doméstica.

Em Portugal há cerca de seis dezenas de grandes barragens de betão com observação continuada, sendo que cerca de um terço estão afetadas por reações expansivas de origem interna do betão. Uma delas, a barragem do Alto Ceira, foi mesmo substituída em 2013, já que não era viável a sua reabilitação. Há três que apresentam valores médios das extensões acumuladas no tempo superiores a 1000×10–6 (Pracana, Santa Luzia e Fagilde). A barragem de Pracana sofreu importantes obras de reabilitação na década de 1980. Atualmente apenas a barragem de Fagilde apresenta taxas de expansão anuais superiores a 100×10–6. Nas outras barragens afetadas os processos de deterioração são ainda de pequena a moderada magnitude, mas em algumas delas as taxas de expansão têm aumentado nos últimos anos. Apresenta-se uma síntese das principais atividades de observação (monitorização, inspeção e ensaios) das obras e dos resultados de alguns estudos realizados, no âmbito do acompanhamento do comportamento deste conjunto de barragens.

The paper presents a method for aligning the relevant financial and technical procedures for determining drainage assets