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Full-Text Articles in Physical Sciences and Mathematics
Leakage Detection And Localization Method Based On A Hybrid Inverse/Direct Modelling Approach Suitable For Handling Multiple-Leak Scenarios, Jordi Meseguer, Josep M. Mirats, Gabriela Cembrano, Vicenç Puig, Eduard Bonada
Leakage Detection And Localization Method Based On A Hybrid Inverse/Direct Modelling Approach Suitable For Handling Multiple-Leak Scenarios, Jordi Meseguer, Josep M. Mirats, Gabriela Cembrano, Vicenç Puig, Eduard Bonada
International Conference on Hydroinformatics
When an accurate hydraulic network model is available, direct modeling techniques are very straightforward and reliable for on-line leakage detection and localization applied to large class of water distribution networks. In general, this type of techniques based on analytical models can be seen as an application of the well-known fault detection and isolation theory for complex industrial systems. Nonetheless, the assumption of single leak scenarios is usually made considering a certain leak size pattern which may not hold in real applications. Upgrading a leak detection and localization method based on a direct modeling approach to handle multiple-leak scenarios can be, …
Leakage Localization In Virtual District Metered Areas With Differential Evolution, David Steffelbauer, Markus Günther, Markus Neumayer, Daniela Fuchs-Hanusch
Leakage Localization In Virtual District Metered Areas With Differential Evolution, David Steffelbauer, Markus Günther, Markus Neumayer, Daniela Fuchs-Hanusch
International Conference on Hydroinformatics
Leakages in water distribution systems (WDS) can lead to supply interruptions, contaminations and economic losses. Hence finding leaks before they cause severe problems is a crucial task for water utilities. To identify the existence of leaks, night flow measurements in district-metered areas (DMA) are common practice. Therefore, the entire system has to be subdivided in hydraulically separated partial networks. However, many utilities do not want to lose the hydraulic redundancy of their system and hence search for other solutions to identify and allocate leaks. In our research, the effects of leakages on the hydraulic behaviour of WDS are utilized to …
A Hybrid Optimization Method For Real-Time Pump-Scheduling, Valeria Puleo, Mark Morley, Gabriele Freni, Dragan A. Savić
A Hybrid Optimization Method For Real-Time Pump-Scheduling, Valeria Puleo, Mark Morley, Gabriele Freni, Dragan A. Savić
International Conference on Hydroinformatics
Linear, non-linear and dynamic programming, heuristics and evolutionary computation are amongst the techniques which have been applied to obtain solutions to optimal pump-scheduling problems. Most of these either greatly simplify the complex water distribution system or require significant time to solve the problem. The scheduling of pumps is frequently undertaken in near-real time, in order to minimize cost and maximize energy savings. However, this requires a computationally efficient algorithm that can rapidly identify an acceptable solution. In this paper, a hybrid optimization model is presented, coupling Linear Programming and Genetic Algorithms. The resulting hybrid optimization model has demonstrated more rapid …
Practical-Oriented Pressure Sensor Placement For Model-Based Leakage Location In Water Distribution Networks, Eduard Bonada, Jordi Meseguer, Josep M. Mirats
Practical-Oriented Pressure Sensor Placement For Model-Based Leakage Location In Water Distribution Networks, Eduard Bonada, Jordi Meseguer, Josep M. Mirats
International Conference on Hydroinformatics
In order to bring remarkable benefits to operation and management of water networks, the analysis of sensed data can be used to locate water leaks using of a model-based methodology. However, the number of sensors installed is usually limited because of budget constraints and hence a strategy for optimizing their number and placement is required. This optimization is tightly coupled to the performance of the real-time model-based leakage diagnosis operation and hence the former should consider the requirements of the latter: (1) high distinguishability among all potential leaks to be detected; and (2) strong robustness in front of model-reality mismatches …
Optimizing Operating Rules Of Multiple Source Water Supply Systems In Terms Of System Reliability And Resulting Operating Costs: Survey Of Simulation-Optimization Modeling Approaches Based On General Purpose Tools, Jordi Meseguer, Gabriela Cembrano, Josep M. Mirats, Eduard Bonada
Optimizing Operating Rules Of Multiple Source Water Supply Systems In Terms Of System Reliability And Resulting Operating Costs: Survey Of Simulation-Optimization Modeling Approaches Based On General Purpose Tools, Jordi Meseguer, Gabriela Cembrano, Josep M. Mirats, Eduard Bonada
International Conference on Hydroinformatics
Management of a water supply system from the point of view of the conjunctive use of water sources is a very complex problem whose solution is not just obtained using analytical models but also through a negotiation process among stakeholders and in which Public Bodies have a main role. For these reasons, this problem has been addressed using conservative approaches based on simulation models or simulation – linear optimization models parameterized using few parameters. These approaches have certain strengths but also certain drawbacks or constraints. In general these conservative approaches are already covered by existing generalized modelling tools (i.e. Aquator, …
Stochastic And Deterministic Parameter Estimation Of Coupled Bacteria-Sediment Fate And Transport In Streams, Tri Le, Arash Massoudieh
Stochastic And Deterministic Parameter Estimation Of Coupled Bacteria-Sediment Fate And Transport In Streams, Tri Le, Arash Massoudieh
International Conference on Hydroinformatics
E. Coli is widely used as an indicator organism to assess the risk of pathogenic bacteria in water bodies. Due to their strong association with suspended and bed sediments, the fate and transport of micro-organisms in water bodies is strongly controlled by sediment dynamics. It has been shown that bed sediments can contain orders of magnitude larger pathogen concentration than the water column and these sediment-associated bacteria can be released into the water column as a result of high flow velocities that cause sediment resuspension. In this presentation parameter estimation of a mechanistic model of bacteria-sediment interaction using a deterministic …
On The Structure Of The Objective Function For A Pressure Sensor Placement Optimizing Methodology Based On Genetic Algorithms Applied To Model-Based Leakage Localization In Distribution Water Networks, Eduard Bonada, Jordi Meseguer, Josep M. Mirats-Tur
On The Structure Of The Objective Function For A Pressure Sensor Placement Optimizing Methodology Based On Genetic Algorithms Applied To Model-Based Leakage Localization In Distribution Water Networks, Eduard Bonada, Jordi Meseguer, Josep M. Mirats-Tur
International Conference on Hydroinformatics
Real-time monitoring of distribution water networks relies on the deployment of sensors and the availability of their measurements in order to predict the system state and assess its performance. A meaningful application of this methodology is the detection and localization of leaks using model-based approaches. Since the number of sensors is limited because of budget constraints, it is important to place these devices in locations where the effectiveness of the leakage diagnosis is maximized. Finding the best sensor distribution is a global optimization problem defined by an objective function that might depend on different factors. Therefore, deriving the correct structure …
Multi-Objective-Rehabilitation Of Urban Drainage Systems Within The Flood Risk Framework, Diego Fernando Paredes Méndez, Arlex Sanchez-Torres, Zoran Vojinović, Solomon D. Seyoum
Multi-Objective-Rehabilitation Of Urban Drainage Systems Within The Flood Risk Framework, Diego Fernando Paredes Méndez, Arlex Sanchez-Torres, Zoran Vojinović, Solomon D. Seyoum
International Conference on Hydroinformatics
Urban drainage systems are one of the most valuable public utilities in any community, which protects public health and the environment, nevertheless is one of the most overlooked infrastructures until considerable failures occurred. If there are not recurrent rehabilitation programs in place this vital infrastructure will decrease the level of service. This work presents an approach to find optimal rehabilitation measures based on the hydraulic performance of the system. To assess the performance of the urban drainage system a coupled 1D-2D model was developed. The model uses SWMM 5.0 for the 1D transport; to simulate the overland flow from the …
Swmm5-Ea – A Tool For Learning Optimization Of Urban Drainage And Sewerage Systems With Genetic Algorithms, Assela Pathirana
Swmm5-Ea – A Tool For Learning Optimization Of Urban Drainage And Sewerage Systems With Genetic Algorithms, Assela Pathirana
International Conference on Hydroinformatics
In spite of the developments in the application of evolutionary algorithms in the urban water sector, it is not widely used by practitioners in their day to day work. A reason for this underutilization is the lack of accessible optimization tools. The available limited options, on the one extreme, are characterized by tools for very specific applications (e.g. pipe sizing): While these provide useful optimization applications in specific domains, they are too restrictive in the range of application. The other extreme is to `glue-together’ a general purpose EA library and other required algorithms (e.g. an urban drainage simulation model) using …
Multi-Objective Pipe Smoothing Genetic Algorithm For Water Distribution Network Design, Matthew Barrie Johns, Edward C. Keedwell, Dragan A. Savić
Multi-Objective Pipe Smoothing Genetic Algorithm For Water Distribution Network Design, Matthew Barrie Johns, Edward C. Keedwell, Dragan A. Savić
International Conference on Hydroinformatics
This paper describes the formulation of a Multi-objective Pipe Smoothing Genetic Algorithm (MOPSGA) and its application to the least cost water distribution network design problem. Evolutionary Algorithms have been widely utilised for the optimisation of both theoretical and real-world non-linear optimisation problems, including water system design and maintenance problems. In this work we present a pipe smoothing based approach to the creation and mutation of chromosomes which utilises engineering expertise with the view to increasing the performance of the algorithm whilst promoting engineering feasibility within the population of solutions. MOPSGA is based upon the standard Non-dominated Sorting Genetic Algorithm-II (NSGA-II) …
Rainfall Interpolation Models Obtained By Means Of Evolutionary Computing, Maritza L. Arganis, Margarita Preciado, Katya Rodriguez, Alfredo Ocon, Ramón Domínguez Mora
Rainfall Interpolation Models Obtained By Means Of Evolutionary Computing, Maritza L. Arganis, Margarita Preciado, Katya Rodriguez, Alfredo Ocon, Ramón Domínguez Mora
International Conference on Hydroinformatics
Complete missing records is a matter of great importance in hydrology problems. In this work we applied genetic algorithms and genetic programming models for precipitation in Cutzamala River Basin, Mexico, such models depend on the geographical coordinates and altitude of climatologic stations currently in operation. The obtained models were applied to interpolate 24 hours rainfalls for three analyzed storms. The Genetic programming model outperformed the genetic algorithm in the estimation of precipitation 24 hours estimated on a site, with respect to the measured data.
Model Predictive Control Combined With Genetic Algorithms For A River System, Po-Kuan Chiang, Patrick Willems
Model Predictive Control Combined With Genetic Algorithms For A River System, Po-Kuan Chiang, Patrick Willems
International Conference on Hydroinformatics
Flood is one of the natural disasters. It frequently causes costly economic losses and numbers of lives come to harm. Due to these severe injuries, how to perform an effective flood control is always a huge challenge for governments and water authorities. In order to establish successful flood control strategies to prevent or alleviate flood damages, besides implementing operating rules (regulations) established by water authorities for the hydraulic structures, applying real time optimization-based control strategies is a supplementary tool for water managers to make decisions. It is expected that the importance of such real time control strategies will become more …
Water Supply Operating Rules In Parallel Dams By Means Of Genetic Algorithms, Rosalva Mendoza-Ramírez, Maritza L. Arganis, Ramón Domínguez Mora, Gerardo Acuna
Water Supply Operating Rules In Parallel Dams By Means Of Genetic Algorithms, Rosalva Mendoza-Ramírez, Maritza L. Arganis, Ramón Domínguez Mora, Gerardo Acuna
International Conference on Hydroinformatics
Cutzamala system is the most important hydraulic work that the Mexico State had provided to Mexico’s center region; its objective is the water supply with at least 16 m3/s to the country’s capital, since 1974. The system consist of Tuxpan and El Bosque dams, both located in Michoacán State, and Ixtapan del Oro, Villa Victoria, Valle de Bravo, Chilesdo and Colorines dams located in Mexico State; each one belong to Cutzamala River Basin. At the Institute of Engineering of the National Autonomous University of Mexico studies have been done since the mid-90s of last century in order to obtain optimal …
Optimal Operation And Sustainability Of The Multiple Reservoir System In The Yaqui Valley In Sonora, Mexico [Abstract], José Luis Minjares, Zohrab Samani
Optimal Operation And Sustainability Of The Multiple Reservoir System In The Yaqui Valley In Sonora, Mexico [Abstract], José Luis Minjares, Zohrab Samani
Allocating and Managing Water for a Sustainable Future: Lessons from Around the World (Summer Conference, June 11-14)
2 pages.