Aplicação do Controlo Numérico BIVAL a um Canal Experimental

O controlo local monovariável em que o órgão de controlo (comporta ou descarregador) controla a profundidade do escoamento imediatamente a montante (controlo local por montante) ou a jusante (controlo local por jusante) são as técnicas mais usuais (sobretudo a primeira) uma vez que são fáceis de calibrar e implementar. Apresenta-se neste artigo um estudo sobre uma das várias alternativas de controlo digital existentes em canais de distribuição de água para rega, o controlo BIVAL, sendo este o controlo que oferece maior flexibilidade na distribuição. Os modelos de simulação hidráulica, em regime variável, são ferramentas indispensáveis na modernização dos sistemas de distribuição de água para rega, uma vez que estes poderão prever o comportamento dos seus órgãos reguladores (comportas ou descarregadores), se bem calibrados e validados. A calibração e validação do modelo BIVAL são realizadas para o Canal Experimental do Núcleo de Hidráulica e Controlo de Canais do Departamento de Engenharia Rural da Universidade de Évora, recorrendo, para o efeito, a um modelo hidráulico de simulação adequadamente calibrado para o canal objecto de estudo

Urban water infrastructure asset management plan: case study

The current paper aims the application of the Portuguese infrastructure asset management (IAM) methodology to a case study. The inevitable degradation of urban water infrastructures creates new challenges forwater utilities engineers and manager, as they need to decide which components should be rehabilitated to efficiently match the public’s demand, while still providing a qualitative and efficient service that doesn’t compromise the financial integrity of water utilities. This methodology is based on a five-step structured sequence - (i) definition of objectives assessment criteria and metrics; (ii) diagnosis; (iii) plan production; (iv) plan implementation; and (v) monitoring and revision – being structured in three distinct levels of planning and decision (i.e., strategic, tactical and operational). The IAM methodology was applied to a sixty-year-old water supply system (WSS) located in Lisbon’s metropolitan area, Portugal, mainly focused on steps (i) to (iii) and to the tactical level of planning. Results obtained are discussed and the main conclusions are presented.info:eu-repo/semantics/publishedVersio

Urban water infrastructure asset management plan: a practical application

Trabalho apresentado no 15th Computing and Control in the Water Industry (CCWI2017), 5-7 de setembro 2017, Sheffield, Reino UnidoThis paper aims the application of the Portuguese infrastructure asset management (IAM) methodology to a case study. This methodology establishes that the IAM plan should have three distinct planning levels: strategic, tactical and operational. Each one of these levels follows a five-step structured sequence: (i) definition of objectives, assessment criteria, metrics and targets; (ii) diagnosis; (iii) plan elaboration, along with the identification, comparison and selection of alternative solutions; (iv) plan implementation; (v) plan monitoring and review. The paper will focus, mainly in steps (i) to (iii) and to the tactical level of planning. Results obtained are discussed and the main conclusions are presented.N/

A case study of rainfall-derived infiltration and inflow of a separate sanitary sewer system

Trabalho apresentado na 14th Computeing and Control for the Water Industry, 7-9 novembro de 2016, Amesterdão, HolandaRainfall-deriver infiltration and inflow (RDII) can interfere with the performance of domestic wastewater drainage systems. It is also a major cause for the deterioration of the functional performance of those drainage systems and for the occurrence of untreated discharges of domestic wastewater to the water environment. In most cases, the actual size and location of these inflows are unknown. To assess this subject of the RDII, it is required to hold a detailed knowledge of the network and to do the diagnosis of the main problems, namely, the type of inflows, the magnitude of its occurrence and the places where the impacts are most relevant. This paper presents the application of an estimation methodology of RDII to a Portuguese case study

A bibliometric analysis of the plastic waste

Trabalho apresentado em 1st International Conference on Challenges in Engineering, Medical, Economics & Education: Research & Solutions (CEMEERS-23), 21-22 junho 2023, Lisboa, PortugalN/

Assessment Platform of Water and Energy Efficiency in Collective Irrigation Systems

Trabalho apresentado em 13th IADIS International Conference on Information Systems, 2-4 Abril 2020 Sofia, Bulgária.Southern European countries do not have regular precipitation to assure the agricultural water needs, since precipitation occurs scarcely from April to October. As such, irrigation is essential for agriculture and is only possible with the existence of hydraulic infrastructures for storage and water conveyance. In Portugal, these hydraulic infrastructures are mostly public, forming collective irrigation systems, and managed by Irrigation Associations. The efficiency of irrigation should be assured through a set of guidelines and procedures promoting a more efficient use of water and energy. Furthermore, in Portugal there are currently no performance assessment system developed to evaluate the water and energy efficiency in CIS. The current practice for the assessment of water and energy efficiency is a set of reactive and unintegrated actions. As such, the gathered information is not usually organized and does not follow systematic procedures. Additionally, appropriate indicators for water and energy loss diagnostic are not defined, thus making it impossible to compare efficiencies between CIS. In this context, the AGIR R&D project aiming the establishment of a performance assessment system for water and energy efficiency assessment in CIS was developed. One of the outcomes of the project was the development of a user friendly platform for the CIS management utilities to assess its water and energy efficiencies. This paper presents the platform AGIR, its functionalities and main components. The platform was designed allowing systematic and uniform data introduction, for usage by various decision support modules.N/

Hyperparameter Optimization of a Convolutional Neural Network Model for Pipe Burst Location in Water Distribution Networks

The current paper presents a hyper parameterization optimization process for a convolutional neural network (CNN) applied to pipe burst locations in water distribution networks (WDN). The hyper parameterization process of the CNN includes the early stopping termination criteria, dataset size, dataset normalization, training set batch size, optimizer learning rate regularization, and model structure. The study was applied using a case study of a real WDN. Obtained results indicate that the ideal model parameters consist of a CNN with a convolutional 1D layer (using 32 filters, a kernel size of 3 and strides equal to 1) for a maximum of 5000 epochs using a total of 250 datasets (using data normalization between 0 and 1 and tolerance equal to max noise) and a batch size of 500 samples per epoch step, optimized with Adam using learning rate regularization. This model was evaluated for distinct measurement noise levels and pipe burst locations. Results indicate that the parameterized model can provide a pipe burst search area with more or less dispersion depending on both the proximity of pressure sensors to the burst or the noise measurement level.info:eu-repo/semantics/publishedVersio

Utilização de medidores inteligentes no combate às perdas aparentes: caso de estudo de São Pedro do Corval, Reguengos de Monsaraz

Trabalho apresentado em Encontro Nacional de Entidades Gestoras de Água e Saneamento, 23 a 26 de novembro, Vilamoura, PortugalCada vez mais a sociedade moderna aposta numa gestão inteligente das suas cidades, com a criação das Smart Cities, também o setor da água se vai, tendencialmente, adequando às novas tecnologias e enquadrando-se no conceito das smart cities. Desta forma, cada vez mais entidades gestoras (EG) recorrem a sistemas de medidores inteligentes ou medidores IoT para a monitorização da qualidade da água, combate às perdas reais e às perdas aparentes de água. O presente artigo apresenta a aplicação de um sistema de medidores inteligentes no combate às perdas aparentes pelo Município de Reguengos de Monsaraz, em parceria com a empresa HT – Water management solutions. Também é feita a comparação entre o sistema implementado, que consiste em leituras dos consumos de água através de recursos humanos, e o sistema de telemetria LoRa (medidores inteligentes de água). No final serão apresentadas as principais conclusões evidenciando as principais diferenças na eficiência e fiabilidade dos sistemas, e apontando possíveis caminhos a seguir pelas EG.N/

Comparison of reconstruction methods for water supply systems flow rate time series

Trabalho apresentado em International Conference on Water Energy Food and Sustainability (ICoWEFS 2021), 10 -12 maio, 2021, onlineThe purpose of this paper is to compare the performance of five univariate models for the reconstruction of flow rate time series. Errors in the measurements may occur due to problems in the sensor or in the communication system with data logger, thus generating missing data in the flow rate time series. The presence of missing values in flow rate data restricts its use in network operation processes. The performance of seasonal ARIMA, Standard and double seasonality Holt-Winters, and original and improved Quevedo approach are assessed. The analysis is made considering a real Portuguese case study and 1- month of flow rate data at 1-hour and 10-minute period. The holidays compared to the weekdays show great differences in consumption patterns. For this reason, the effect of forecasting holidays is assessed. Obtained results evidence that the improved Quevedo model can cope with different time step intervals and type of day being forecasted, with a reduced computation time.N/

Towards an integrated platform for decision support in water utility management

Trabalho apresentado em 12th IADIS International Conference on Information Systems, 11 a 13 Abril de 2019, Utrecht, Holanda.The pressure on water supply systems is a real challenge for water utilities, which are entrusted with the responsibility to manage and operate those systems. Water utility engineers and managers make decisions based on data that are obtained from several information systems (IS), such as geographic information systems (GIS), billing, asset operation and maintenance or accounting. Most of the time, these IS result in data silos as a consequence of lack of machine communication protocols, common data formats or common meaning of exchanged content. On the other hand, the diversity of IS is a challenge to water utilities which struggle with data consistency and interoperability. In this context, water utility engineers and managers make decisions based on data which are often incomplete, inaccurate or out-of-date. In this paper, we present an IT platform that integrates data from different information systems, including tools to support decision-making on water supply systems (e.g., performance indicators, water, and energy balances). This platform, developed in collaboration with a representative set of Portuguese water utilities, allows water utilities to integrate their data and perform analysis of their systems. With this approach, we provide water utilities and water supervision agencies with the possibility to compute a unified set of metrics whatever the IS they use.N/