Papers

Falou-se anteriormente (cm30) nos fenómenosque presidem ao desenvolvimento de fendas de secagem na madeira aplicada em obra, sua importância e avaliação, com destaquepara as respectivas consequências em termos de resistência mecânica e durabilidade das estruturas.Procurou-se alertar para o facto de a abertura de fendas de secagem na madeira ser, até certo ponto, um fenómeno natural e incontornável, devendo haver algum cuidado no julgamento da importância das fendas e procurando distinguir as situações aceitáveis do ponto de vista da segurança estrutural daquelas que requerem efectivamente uma intervenção pronta e cuidadosa.A reparação de fendas pode ser feita por diversosmeios, dependendo da sua expressão e gravidade, condições de exposição da estruturae acesso para a reparação e, naturalmente, do efeito pretendido.Nunca é demais salientar a enorme diferença entre ocultar uma fenda e repará-la efectivamente.A simples ocultação com betumes

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This paper aims at giving an overview of the global development of strategicasset management (SAM) of water and wastewater infrastructures. It discusses a number ofexamples of national and regional asset management approaches and applications. Theneed for tools, research and global cooperation to support the further development and use ofSAM in the water sector is described.

This report explains the reasons why performance assessment is afundamental pillar of strategic asset management. It introduces some key concepts relatedto performance assessment systems (PAS), explains the fundamentals for the definition oftarget values and the implementation of performance assessment measures. It justifies whyutilities performance systems are also very important for the other stakeholders. It presents abrief state-of-the-art on the subject, and provides a view on the current shortcomings,challenges and future trends.

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Digital preservation is the ability to retrieve, access, and use digitalobjects through time, while ensuring the authenticity and integrity properties ofthese objects. Data grids represent a model of storage systems designed for datamanagement and sharing, which concept also has been proposed for digitalpreservation. However, since data grids are not specifically designed for thispurpose, they present weaknesses that have to be handled. This poster willpresent a set of services to address a problem in the metadata catalog of theiRODS data grid, strengthening that platform for digital preservation purposes.

A one-dimensional vertical (1-DV) numerical model that predicts mean sediment transport rates has been recently updated with state-of-the-art methods and tested against available field observations. Model calibration has been done through a comparison analysis between formulations regarding three main parameters: bed roughness, reference concentration and sediment vertical mixing coefficient. The objective was to find the optimal combination of formulae based on the agreement of the model results with field data. Though important discrepancies were found between different predictors, with differences reaching, in some cases, two orders of magnitude, the best combinations of predictors allowed a very good agreement between model predictions and observations.

Decisions to mitigate seismic risk require a consistent approach to evaluate the effects of future earthquakes on population, on civil engineering structures and infrastructures.The mathematical and probabilistic methods that are the support to those approaches are generally called Risk Analysis; in the particular case of seismic events andmitigation strategies it will be named Seismic Risk and Mitigation Analysis, SRMA. The paper will address the subject of estimating the seismic risk and evaluate mitigation strategies for the existing building stock of the metropolitan area of Lisbon by describing the methods and showing preliminary results obtained with LNECloss numerical tool. Even though such a sophisticated tool needs validation on some parameters to become more reliable, it is shown that it is possible to compare results of different mitigation strategies.

Ecological models can be useful tools for understanding the dynamics of the estuarine and coastal ecosystems. However, the application of these models in real systems requires the specification of many empirical input parameters, which are in general difficult to quantify for a specific site. This study presents a sensitivity analysis on the input parameters of the model ECO-SELFE applied to the Ria de Aveiro. ECO-SELFE is a threedimensional, unstructured grid, fully-coupled hydrodynamic-ecological model. The sensitivity analysis is based on a previous analysis using the zero-dimensional ecological model, where one parameter was varied with the others being held constant. Results show that phytoplankton growth rate and zooplankton excretion and mortality rates are the parameters that influence the results the most. The degree of influence of these parameters depends on the local concentrations of zooplankton and phytoplankton. These two ecological variables are also most affected by the variations in the input parameters.