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  • Erosion resistance and behaviour of highly organic in-sewer sediment

     Seco, Raquel Irene; Gomez Valentin, Manuel; Schellart, A.; Tait, S.
    Water science and technology
    Date of publication: 2014-01-01
    Journal article

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    Reliable prediction of time-varying pollutant loads in combined sewer systems during storm periods can aid better management of the release of pollution into natural environments as well as enhancing storage tank design. Better understanding of the behaviour of sewer sediments is crucial for the development of models that adequately describe the transport of in-sewer solids and accurately predict the changes in pollutant concentration within combined sewers during storm events. This paper reports on the results of a test programme to examine the erosion of highly organic sewer sediment under the application of time-varying shear stress. The tests were carried out with and without supplying oxygen, and varying simulated dry-weather periods. The aim was to investigate the behaviour of real in-sewer sediment with a high organic content (around 80%) in an attempt to improve prediction of the transport rates under the particular Mediterranean conditions of long dry-period/build-up and intense rainfall/wash-off, and understand how this environment affects the erosional resistance and subsequent sediment release. Results have been compared with previous work on lower organic content sewer sediments and artificial organic sediment.

  • Influence of channel width on flow distribution in four-branch junctions with supercritical flow: experimental approach

     Nania Escobar, Leonardo Santos; Gomez Valentin, Manuel; Gonzalo, Ruth
    Journal of hydraulic engineering (New York, N. Y.)
    Date of publication: 2014-01-01
    Journal article

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    An experimental study of the supercritical dividing flow in a right-angle, four-branch junction with different channel widths is presented. Lateral-to-mainstream width ratios of 1:1, 2:3, and 1:2 were used to establish the influence of the channel width on the flow distribution. A brief description of the flow characteristics is given. Types I and II flow patterns are confirmed by the experiments in the range of the studied variables. Existing flow distribution models were adapted for width ratios other than 1:1 and tested for Type II, subregime 3 flow pattern, finding poor results. Other existing flow distribution models for Type II, subregimes 1 and 2 flow pattern and a width ratio of 1:1 give a very good fit with the experimental data. A new flow distribution model for Type II, subregimes 1 and 2 flow pattern and width ratios of 2:3 and 1:2 was proposed, which is a function of the Froude number and the width ratio. A former model for predicting the flow distribution in equal-width (1:1 width ratio) junctions was extended for width ratios of 2:3 and 1:2. This model expresses the flow distribution as a function of the inflow power ratio and has the advantage over existing models that, for its application, the flow structure (angles of the oblique jumps) in the junction does not need to be determined beforehand. Although it is not necessary to apply the proposed flow distribution model, the flow structure (flow type and angle of the oblique jump or jumps, if presented) can also be predicted through the inflow power ratio, the inflow ratio, and the channel slope combination in the case of width ratios of 2:3 and 1:2.

  • Methodology to estimate the hydraulic efficiency of nontested continuous transverse grates

     Russo, Beniamino; Gomez Valentin, Manuel; Tellez Alvarez, Jackson David
    Journal of irrigation and drainage engineering
    Date of publication: 2013
    Journal article

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    The aim of this paper is to improve and complete the results presented in a previous work published on this journal about an experimental campaign focused on the hydraulic efficiency of continuous transverse grates for draining paved areas. This type of surface drainage structure is commonly used in urban or impervious areas (public squares, airport pavements, parks, and pedestrian areas), where conventional inlets are not recommended because they are rendered ineffective by the lack of a well-defined channelized flow path and gradients capable of directing flows toward the collecting hydraulic structures. In this paper, a methodology is presented to estimate the hydraulic efficiency of nontested continuous transverse grates. Empirical expressions are proposed to relate grate hydraulic performance to flow parameters and grate geometry without the need for laboratory tests. Moreover, the spectrum of the grates was extended in terms of dimensions and hydraulic design with respect to the first study, to enlarge the range of validity of the proposed empirical expressions.

    The aim of this paper is to improve and complete the results presented in a previous work published on this journal about an experimental campaign focused on the hydraulic efficiency of continuous transverse grates for draining paved areas. This type of surface drainage structure is commonly used in urban or impervious areas (public squares, airport pavements, parks, and pedestrian areas), where conventional inlets are not recommended because they are rendered ineffective by the lack of a well-defined channelized flow path and gradients capable of directing flows toward the collecting hydraulic structures. In this paper, a methodology is presented to estimate the hydraulic efficiency of nontested continuous transverse grates. Empirical expressions are proposed to relate grate hydraulic performance to flow parameters and grate geometry without the need for laboratory tests. Moreover, the spectrum of the grates was extended in terms of dimensions and hydraulic design with respect to the first study, to enlarge the range of validity of the proposed empirical expressions.

  • Pedestrian hazard criteria for flooded urban areas

     Russo, Beniamino; Gomez Valentin, Manuel; Macchione, Francesco
    Natural hazards
    Date of publication: 2013-10
    Journal article

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    Urban floods are sudden phenomena normally characterized by short flooding durations and devastating effects due to the high concentrations of persons, goods, and properties located in urban areas. In these cases, uncontrolled runoff can flow on urban streets, creating a significant hazard for pedestrians and vehicles. The safety of people can be compromised when they are exposed to flows that exceed their ability to remain standing or to traverse flow paths. With the aim of studying the stability of pedestrians in flooded street during storm events, a model representing an urban street in real scale was designed and built. Following a specific protocol that considering several flow rates (up to 500 l/s) and different longitudinal slopes (up to 10 %), 834 tests, using 23 human subjects, were carried out in good and poor light conditions. Hazard conditions were classified into three groups (low, medium, and high), and the parameters for which these conditions occurred were recorded. Results showed that for subjects weighing 50-60 daN (50-60 kg mass) and flow depths between 9 and 16 cm, velocities of 1.5-2 m/s can generate loss of stability due to phenomena of dragging or overturning. Empirical expressions were proposed to relate human subject characteristics (weight and height) and limiting flow conditions at which loss of stability occurs. © 2013 Springer Science+Business Media Dordrecht.

    Urban floods are sudden phenomena normally characterized by short flooding durations and devastating effects due to the high concentrations of persons, goods, and properties located in urban areas. In these cases, uncontrolled runoff can flow on urban streets, creating a significant hazard for pedestrians and vehicles. The safety of people can be compromised when they are exposed to flows that exceed their ability to remain standing or to traverse flow paths. With the aim of studying the stability of pedestrians in flooded street during storm events, a model representing an urban street in real scale was designed and built. Following a specific protocol that considering several flow rates (up to 500 l/s) and different longitudinal slopes (up to 10 %), 834 tests, using 23 human subjects, were carried out in good and poor light conditions. Hazard conditions were classified into three groups (low, medium, and high), and the parameters for which these conditions occurred were recorded. Results showed that for subjects weighing 50–60 daN (50–60 kg mass) and flow depths between 9 and 16 cm, velocities of 1.5–2 m/s can generate loss of stability due to phenomena of dragging or overturning. Empirical expressions were proposed to relate human subject characteristics (weight and height) and limiting flow conditions at which loss of stability occurs.

  • An adaptive predictive approach for river level forecasting

     Aguilar, Jose V.; Langarita, Pedro; Linares, Lorenzo; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Journal of hydroinformatics
    Date of publication: 2013
    Journal article

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    Efficient flood management requires accurate real-time forecasts to allow early warnings, real-time control of hydraulics structures, or other actions. Commercially available computing tools typically use hydraulic models derived from the numerical approximation of Saint-Venant equations. These tools need powerful computers, accurate knowledge of the riverbed topography, and skilled operators with a not insignificant hydraulic background. This paper presents an alternative approach in which the river basin is modeled as a network of cascade interconnected input-output systems. Each system is modeled by an adaptive predictive expert model, which provides real-time fast and accurate forecasts over a moving prediction horizon. The approach is evaluated using real data from the Ebro river basin in Spain. The main concluded advantages of the new approach are: (1) the formulation is simple with low computational burden; (2) it does not require topographic information on the river waterbeds; (3) the forecast may be performed autonomously.

  • Application of the GoRoSo feedforward algorithm to compute the gate trajectories for a quick canal closing in the case of an emergency

     Soler Guitart, Joan; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian; Gamazo, Pablo
    Journal of irrigation and drainage engineering
    Date of publication: 2013-12
    Journal article

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    The canal delivery system in the Left Hemidelta area of the Ebro River in Spain consists of a tree-shaped net of open canals. The overall system can be quickly isolated in the case of an emergency by closing the upstream pool. Transients, in which the initial state is hydraulically far from the final state, are difficult to handle and cannot be made in only one gate movement in order to protect the canal lining. Therefore, they have to be as smooth as possible. GoRoSo is a feedforward control algorithm for irrigation canals based on sequential quadratic programming. With this tool, it is possible to calculate the gate trajectories that smoothly carry the canal from the initial state to the final state by keeping the water depth constant at checkpoints. The paper shows the efficient implementation of GoRoSo in both the closure and opening operations of the canal delivery system.

  • Experimental campaign to determine grated inlet clogging factors in an urban catchment of Barcelona

     Gomez Valentin, Manuel; Hidalgo Rabaseda, Guillem; Russo, Beniamino
    Urban Water Journal
    Date of publication: 2013-02
    Journal article

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  • GoRoSo: feedforward control algorithm for irrigation canals based on sequential quadratic programming

     Soler Guitart, Joan; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Journal of irrigation and drainage engineering
    Date of publication: 2013-01
    Journal article

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  • Multivariable model predictive control of water levels on a laboratory canal

     Horväth, Klaudia; Galvis Restrepo, Eduard; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian; Van Overloop, P.J.
    Date of publication: 2013-08
    Book chapter

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  • Model predictive control of resonance sensitive irrigation canals.  Open access

     Horväth, Klaudia
    Defense's date: 2013-05-30
    Department of Hydraulic, Maritime and Environmental Engineering, Universitat Politècnica de Catalunya
    Theses

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    Una manera de reducir las pérdidas en redes de riego es mediante la automatización de canales. El objetivo de la automatización es hacer que el agua llegue a los regantes en la cantidad y en el tiempo deseado. Para alcanzar este objetivo, una manera es controlar las compuertas en la red de riego mediante algún algoritmo. En este trabajo se estudia un tipo específico de canal de riego: corto y plano con tendencia a la resonancia. Se estudia el control de nivel aguas abajo usando un ejemplo de canal de tres tramos: el canal de laboratorio de la Universitat Politècnica de Catalunya. Se estudian numérica y experimentalmente los siguientes aspectos: elección de modelo para control predictivo, la posibilidad de obtener un control sin ¿offset¿ teniendo extracciones por gravedad (vertederos) y la mejor elección de variables de control.El objetivo de este trabajo es desarrollar controladores predictivos basados en modelo (MPC) centralizados con un buen rendimiento para el canal de laboratorio, que sean capaces de manejar cambios conocidos y desconocidos de consigna. También se presentan conclusiones adicionales para este tipo de canales.Por primera vez se ha implementado y comprobado experimentalmente con éxito el modelo ¿Integrator Resonance¿ (Integrador resonancia) formulado para canales con resonancia.Se ha desarrollado una nueva metodología y comprobado numérica y experimentalmente para obtener un control predictivo sin offset.Se ha estudiado la elección de variables de control: a diferencia del uso general del caudal como variable de control, se ha formulado un modelo de espacio de estado utilizando las aberturas de las compuertas cómo variable de control sin la necesidad de incluir los niveles medidos abajo de las compuertas. Se presentan resultados y conclusiones que pueden ser útiles para la gestión y el control de canales cortos con poca pendiente, y que tienen tendencia a la resonancia.

    Saving water is an economic and ecological need. One way to save water is to reduce losses in irrigation networks by canal automation. The goal of canal automation is to make the right amount of water to at arrive in the right time. In order to achieve this goal, one of the ways is controlling the gates in the irrigation network by some control algorithm. In this work the control of a specific type of canal pools is studied: short and flat pools that are prone to resonance. The downstream water level control of this type of canals is investigated using the example of the 3-reach laboratory canal of the Technical University of Catalonia. Numerical and experimental studies are carried out to investigate the following: the choice of models for predictive control, the possibility to achieve offset-free control while using gravity offtakes and the best choice of control action variables. The objective of this work is to develop a well performing centralized model predictive controller (MPC) for the laboratory canal that is able to handle known and unknown setpoint changes and disturbances, and also to draw further conclusions about controller design for this type of canals. A recently developed model for resonant canals, the Integrator Resonance, is implemented and successfully tested experimentally for the first time. A new method to achieve offset free control for model predictive control is developed and tested numerically and experimentally. A choice of control variables are tested: As opposed to the discharge which is generally used as the control action variable, a state space model is formulated by using the gate opening as control variable without the need of water level measurement downstream of the gates. The results are summarized and conclusions are presented for control of short and flat canals that are prone to resonance.

  • Algoritmo "CSI: Canal Survey Information" para el seguimiento de los caudales extraídos en canales de regadío

     Soler Guitart, Joan; Bonet Gil, Enrique; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian; Gamazo, Pablo
    Jornadas de Ingeniería del Agua
    Presentation's date: 2013-10-23
    Presentation of work at congresses

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  • Calidad de aguas en tiempo de lluvia: estudio de una cuenca urbana en la región Mediterránea y calibración de un modelo hidrológico y de calidad en SWMM 5.0

     Seco, Raquel Irene; Gomez Valentin, Manuel
    Jornadas de Ingeniería del Agua
    Presentation's date: 2013-10-23
    Presentation of work at congresses

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  • Erosion resistance and behaviour of highly organic in-sewer sediment

     Seco, Raquel Irene; Gomez Valentin, Manuel; Schellart, Alma N.A.; Tait, Simon
    International Conference on Sewer Processes & Networks
    Presentation's date: 2013-08-28
    Presentation of work at congresses

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    The reliable prediction of time varying pollutant loads in combined sewer systems during storm periods can aid better management of the release of pollution into natural environments as well as enhancing storage tank design. Better understanding of the behaviour of sewer sediments is crucial for the development of models that adequately describe the transport of in-sewer solids and accurately predict the changes in pollutant concentration within combined sewers during storm events. This paper reports on the results of a test programme to examine the erosion of highly organic sewer sediment under the application of time varying shear stress. The shear stresses were related to flows into real sewers. The tests were carried out with and without supplying oxygen, and varying the length of time of the simulated dry-weather period. The aim was to investigate the behaviour of real in-sewer sediment with a high organic content (around 80%) in an attempt to improve prediction of the transport rates under the particular Mediterranean conditions of long dry-period/build-up and intense rainfall/wash-off, and understand how this environment affects the erosional resistance and subsequent sediment release. Results have been summarized and compared with previous work on lower organic content sewer sediments and artificial organic sediment.

  • Source term treatment of SWEs using the surface gradient upwind method

     Blade i Castellet, Ernest; Gomez Valentin, Manuel; Sanchez Juny, Marti; Dolz Ripolles, Jose
    Journal of hydraulic research
    Date of publication: 2012-08
    Journal article

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  • Modelling impacts of climate change on water resources in ungauged and data-scarce watersheds: application to the Siurana catchment (NE Spain)

     Candela, Lucila; Tamoh, Karim; Olivares Cerpa, Gonzalo; Gomez Valentin, Manuel
    Science of the total environment
    Date of publication: 2012-12-01
    Journal article

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  • Introducing dynamics and control to civil engineers through an experimental flume

     Mantecon Baena, Juan Antonio; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Journal of professional issues in engineering education and practice
    Date of publication: 2012
    Journal article

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  • Integration of 1D and 2D finite volume schemes for computations of water flow in natural channels

     Blade i Castellet, Ernest; Gomez Valentin, Manuel; Dolz Ripolles, Jose; Aragón Hernández, José Luis; Corestein Poupeau, Georgina Teresa; Sanchez Juny, Marti
    Advances in water resources
    Date of publication: 2012-06
    Journal article

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  • Multivariable model predictive control of water levels on a laboratory canal

     Horväth, Klaudia; Van Overloop, P.J.; Galvis Restrepo, Eduard; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    New Frontiers of Simulation
    Presentation's date: 2012-09-12
    Presentation of work at congresses

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    Automatic control of irrigation canals can reduce the loss of water in considerable amounts, therefore it is generating ecologic and economic benefits. There have been many different types of automatic controllers developed, but only few of them had the opportunity of being tested on the field due to the long delay time and the inconveniences of interrupting the operation of the irrigation. Therefore, the automatic controllers developed for large irrigation canals should be tested before by means of numerical simulations and/or laboratory experiments. The Technical University of Catalonia possesses a laboratory irrigation canal with the length of 220m, with 3 motorized gates, and 11 level sensors that are connected to a SCADA system. This facility makes it possible to test controllers of any type, since all the instrumentation and real time operation runs within a flexible working environment running in Matlab-Simulink . The canal can be configured from one pool to three pools, which allows the development of multivariable control. A numerical model of the canal has been developed using the 1D hydrodynamic model SIC. With the help of this software it is possible to simulate the hydraulics of the canal and, due to the link between SIC and Matlab, also to test any controller developed previously in the Matlab environment. In this work a centralized multivariable model predictive controller for water levels is developed and validated by means of numerical simulation.

  • The effect of the choice of the control variables of the water level control of open channels: comparison of control schemes using the ASCE Test canal 2

     Horvath, Klaudia; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    IEEE International Conference Networking, Sensing and Control
    Presentation's date: 2012-04
    Presentation of work at congresses

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    The effect of the choice of the control action variables on centralized water level controllers for open channels is analyzed. Three models are compared. In the first model the control action variable is the discharge and then the inverse gate equation is used to calculate the gate openings. In the second case the control action variable is the gate opening and that is incorporated to the canal model - supposing that the upstream water levels of each pool are known. In the third case control variables are also the gate openings but the upstream water level of each canal pool is unknown, they are calculated by the models by using the hydraulic relationships between the variables. These three models are discussed and compared through an example of centralized Linear Quadratic Regulator (LQR) controller using as example the Test canal 2 of the ASCE.

    The effect of the choice of the control action variables on centralized water level controllers for open channels is analyzed. Three models are compared. In the first model the control action variable is the discharge and then the inverse gate equation is used to calculate the gate openings. In the second case the control action variable is the gate opening and that is incorporated to the canal model - supposing that the upstream water levels of each pool are known. In the third case control variables are also the gate openings but the upstream water level of each canal pool is unknown, they are calculated by the models by using the hydraulic relationships between the variables. These three models are discussed and compared through an example of centralized Linear Quadratic Regulator (LQR) controller using as example the Test canal 2 of the ASCE.

  • Desarrollo y aplicación de una herramienta numérica para modelar las fases del drenaje urbano dual

     Aragón Hernández, José Luis; Blade i Castellet, Ernest; Gomez Valentin, Manuel; Múrcia Balaguer, Anna; Concha Jopia, Rodrigo Francisco
    Congreso Latinoamericano de Hidráulica
    Presentation's date: 2012-09-10
    Presentation of work at congresses

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    Transporte de sedimentos depositados en tiempo seco en alcantarillado unitario : Estimación mediante SWMM 5.0  Open access

     Seco, Raquel Irene; Gomez Valentin, Manuel
    Congreso Latinoamericano de Hidráulica
    Presentation's date: 2012-09-11
    Presentation of work at congresses

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    Los vertidos desde alcantarillado unitario durante eventos de tormenta pueden afectar significativamente los estándares de calidad de los medios naturales receptores. Estudios previos apuntan que la principal fuente de contaminantes está asociada a la erosión y resuspensión de sólidos que se depositan dentro de los conductos en el periodo seco antecedente a la precipitación. La predicción de sólidos que se movilizan desde el interior de las conducciones por el escurrimiento de aguas pluviales puede resultar en importantes beneficios tanto en la gestión de la contaminación de medios naturales como en el diseño de depósitos de retención. Los modelos de calidad desarrollados hasta ahora plantean formulaciones de compleja aplicación, o bien proponen el cálculo aproximado pero con una gran cantidad de variables. En este trabajo se presenta la implementación de una etodología conceptual basada en el modelo de calidad de SWMM5.0 que, con pocos parámetros , permita la valoración de la carga sólida movilizada desde los depósitos en el interior de las conducciones durante un evento de precipitación. Así, esta metodología supone una ampliación en la capacidad de trabajo de SWMM5.0 para la obtención de la evolución de la carga sólida total, al contemplar el proceso en el interior de las conducciones que actualmente no considera. Resultados iniciales muestran el potencial de su aplicación.

  • An algorithm for the design of a feedforward controller in canals

     Soler Guitart, Joan; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2011
    Journal article

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  • Methodology to estimate hydraulic efficiency of drain inlets

     Gomez Valentin, Manuel; Russo, Beniamino
    Proceedings of the Institution of Civil Engineers. Water management
    Date of publication: 2011-02
    Journal article

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  • Experimental study of subcritical dividing flow in an equal-width four-branch junction

     Nania Escobar, Leonardo Santos; Gomez Valentin, Manuel; Dolz Ripolles, Jose; Pomares Abad, Juan; Comas, Pau
    Journal of hydraulic engineering (New York, N. Y.)
    Date of publication: 2011-10
    Journal article

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    Aplicación del modelo SWMM 5.0 para la estimación del arrastre de depósitos de sedimentos y contaminantes asociados en sistemas de alcantarillado unitario  Open access

     Seco, Raquel Irene; Gomez Valentin, Manuel
    National Young Water Professionals Conference
    Presentation's date: 2011-06-16
    Presentation of work at congresses

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    veles de partículas sólidas y otros contaminantes se observan en los caudales vertidos desde sistemas unitarios al medio fluvial receptor durante el período inicial de una tormenta. Las investigaciones en este campo sugieren que la principal fuente de estos contaminantes está vinculada al proceso de erosión y resuspensión de sólidos depositado s en los conductos del sistema durante el periodo seco antecedente al evento de precipitación. Este trabajo aborda el desarrollo de una metodología capaz de tratar, en una primera aproximación, el transporte de sedimentos dentro de las conducciones de un sistema de alcantarillado unitario. Su implementación se basa en la aplicación modificada, de un modelo del sistema, en el software de dominio público Storm Water Management Model (SWMM 5.0). Así, esta metodología supone una ampliación en la capacidad de trabajo del mencionado programa de simulación, al contemplar el proceso de erosión y re-suspensión de sólidos preexistentes en el interior de sistemas unitarios, que hasta ahora no se considera. Los resultados obtenidos en un estudio piloto, demuestran la aplicabilidad de la metodología de aproximación para la obtención de la evolución de la carga sólida total y contaminantes asociados, durante un evento de tormenta.

    Postprint (author’s final draft)

  • Simplified modeling of a laboratory irrigation canal for control purposes

     Galvis Restrepo, Eduard; Horväth, Klaudia; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Seminar for Advanced Industrial Control Applications
    Presentation's date: 2011-11
    Presentation of work at congresses

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    http://upcommons.upc.edu/e-prints/bitstream/2117/15391/1/SAICA2011_proceedings.pdf

  • Prueba de algoritmo de control automático en un canal de laboratorio y un canal simulado

     Horväth, Klaudia; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian; Galvis Restrepo, Eduard
    Jornadas de Ingeniería del Agua
    Presentation's date: 2011-10-05
    Presentation of work at congresses

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  • Estimación mediante SWMM 5.0 del transporte de sedimentos depositados durante tiempo seco en conductos de alcantarillado unitario

     Seco, Raquel Irene; Gomez Valentin, Manuel
    Jornadas de Ingeniería del Agua
    Presentation's date: 2011-10-06
    Presentation of work at congresses

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  • Estudio numérico-experimental del flujo de agua en un cruce de calles

     Blade i Castellet, Ernest; Nania Escobar, Leonardo Santos; Gomez Valentin, Manuel
    Date of publication: 2011
    Book chapter

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  • Aproximación al drenaje dual urbano 1D/1D

     Concha Jopia, Rodrigo Francisco; Gomez Valentin, Manuel
    Date of publication: 2011
    Book chapter

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  • Modelización y estudio de un depóstio anticontaminación en la ciudad de Reus

     Concha Jopia, Rodrigo Francisco; Gomez Valentin, Manuel
    Date of publication: 2011
    Book chapter

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  • Desarrollo de un modelo de simulación de flujo en ríos

     Blade i Castellet, Ernest; Cea, Luis; Corestein Poupeau, Georgina Teresa; Aramburu, Enrique; Lara, Ángel; Puertas Agudo, Jerónimo; Gomez Valentin, Manuel; Dolz Ripolles, Jose; Balairon Pérez, Luis
    Date of publication: 2011
    Book chapter

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  • Estudio hidrológico y movimiento de sedimentos del rio Valira (Principado de Andorra)

     Sanchez Tueros, Hans Paul; Gomez Valentin, Manuel; Blade i Castellet, Ernest
    Date of publication: 2011
    Book chapter

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    Modelación numérica del flujo mixto y bolsas de aire atrapado en colectores pluviales  Open access

     Aragón Hernández, José Luis; Blade i Castellet, Ernest; Gomez Valentin, Manuel
    Jornadas de Ingeniería del Agua
    Presentation's date: 2011-10-05
    Presentation of work at congresses

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    [...] En este trabajo para simular numéricamente flujo mixto se presenta un modelo que se clasifica dentro de los modelos dinámicos que utiliza dos sistemas de ecuaciones considerando flujo incomprensible, por lo que para considerar el almacenamiento debido a la presión permite un comportamiento elástico de la tubería. Por otro lado, para modelar y propagar numéricamente las bolsas de aire atrapado con liberación del mismo, se emplea la ley de gas ideal asumiendo un proceso isotérmico- La solución numérica de las ecuaciones se realiza con la técnica de los volúmenes finitos a través del método de Godunov y el Riemann Solver de Roc. Por otra parte, de las campañas realizadas en el Laboratorio de Hidráulica del DEHMA, UPC, para estudiar la entrada en presión se seleccionó un experimento y se reprodujo con el modelo numérico de flujo mixto con y sin la formulación de la fase aire, la carga de presión calculada fue comparada con la medida y de esta manera evaluó la actuación del modelo.

    Postprint (author’s final draft)

  • Irrigation canal models for automatic control purposes  Open access

     Horväth, Klaudia; Galvis Restrepo, Eduard; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Jornada de Recerca i innovació a l'Escola de Camins
    Presentation's date: 2011-11-15
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    volumes during normal canal operation. In order to develop control algorithms for irrigation canals there is a need for simple linear models to be used in the algorithms. The following simple linear models are approximating the canal in order to give a base to develop control algorithms. The PAC-UPC laboratory canal (Prueba de Algoritmos de Control - Universitat Politècnica de Catalunya) is modelled (input and output discharge) using the following three models: Muskingum, Hayami and Integrator Delay Zero (IDZ) and the results are compared to measurements. All three models are able to describe the irrigation canal in an acceptable way. However, only the IDZ model can capture all the important characteristics. These tested models can be applied to represent real canals for control purposes where it is especially important to obtain good models without extensive measurements. Test campaigns are developped now in cooperation with the CHE (Confederación Hidrográfica del Ebro) in order to test control algorithms to be used in irrigation canals under their management.

  • An adaptive predictive approach for river level forecasting

     Aguilar, Jose Vicente; Langarita, Pedro; Linares, Lorenzo; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    International Conference on Networking, Sensing and Control
    Presentation's date: 2011-04-11
    Presentation of work at congresses

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    Efficient flood management requires accurate real time forecasts to allow early warnings, real time control of hydraulics structures or other actions. Commercially available computing tools typically use, for flow or level forecasting, hydraulic models derived from the numerical approximation of Saint-Venant equations. These tools need powerful computers, accurate knowledge of the riverbed topography and skilled operators with some hydraulic background. This paper presents an alternative approach in which the river network is modeled as a cascade of interconnected input-output systems. Each system is modeled by an adaptive predictive expert model, which provides real-time fast and accurate forecasts over a moving prediction horizon. The main advantages of the approach are: (1) simplicity in the formulation and low computational burden; (2) no need of topographic information on the river waterbeds; (3) operators do not need strong hydraulic knowledge and the forecast may be done autonomously. The approach is evaluated using real data from the Ebro river basin in Spain.

  • Influencia de la resolución espacial de los datos de entrada en la simulación hidrológica y sedimentológica en cuencas urbanas de cabecera

     Zambrano Nájera, J.; Gomez Valentin, Manuel
    Jornadas de Ingeniería del Agua
    Presentation's date: 2011-10-06
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  • Design of surface drainage systems according to hazard criteria related to flooding of urban areas

     Russo, Beniamino
    Defense's date: 2010-01-15
    Department of Hydraulic, Maritime and Environmental Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Experimental and numerical modelling of symmetrical four-branch supercritical cross junction flow

     Nania Escobar, Leonardo Santos; Gomez Valentin, Manuel; Dolz Ripolles, Jose; León, Arturo S.
    Journal of hydraulic research
    Date of publication: 2010-12
    Journal article

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  • Una instalación en la Universidad Politécnica de Catalunya para la automatización de canales de riego

     Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Automática e instrumentación
    Date of publication: 2010-02
    Journal article

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  • Estudio hidráulico para el Plan de Emergencia del canal de la margen izquierda del Delta del Ebro

     Soler Guitart, Joan; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Ingeniería del agua
    Date of publication: 2010
    Journal article

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  • Methodologies to study the surface hydraulic behaviour of urban catchments during storm events

     Gomez Valentin, Manuel; Macchione, Francesco; Russo, Beniamino
    Water science and technology
    Date of publication: 2010-06
    Journal article

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    Une bonne connaissance du comportement hydraulique d'un bassin versant urbain et de ses écoulements en surface (avaloirs) représente une exigence essentielle pour garantir la sécurité du trafic et des piétons, ainsi qu’une gestion correcte du système d’assainissement. Dans de nombreux cas, la disposition des avaloirs se fait selon des critères de densité spatiale. En effet, un emplacement plus rationnel des avaloirs des bassins versants urbains doit être défini sur la base d’une analyse hydraulique précise de la relation entre les écoulements de rues et l’efficience hydraulique des avaloirs. Pour ce faire, on doit utiliser des données expérimentales et autres procédures qualifiées. De plus, nous manquons de critères de danger spécifiques en termes de hauteur d'eau et de vitesse d’écoulement maximum acceptables dans les rues sans risque pour les piétons. Cet article présente les résultats de deux campagnes expérimentales différentes. La première a été effectuée pour évaluer l’efficience hydraulique des avaloirs ; la seconde pour étudier la stabilité des piétons dans des conditions d’inondation urbaine. L’objectif était de proposer de nouveaux critères de danger. Sur la base des résultats expérimentaux, une méthodologie a été développée pour évaluer le risque d’inondation dans des zones urbaines au cours d’évènements pluvieux. Si l’on dispose d’une représentation topographique précise des zones urbaines, il est possible d’effectuer une simulation numérique 2D d’inondation urbaine au moyen d’équations complètes sur les eaux peu profondes. Grâce à cette approche, il est possible de calculer avec précision les rejets absorbés par les avaloirs au moyen de formules de rendement hydraulique. De cette manière, on peut élaborer des cartes de danger détaillées. Cet article présente une application numérique réalisée dans une rue de Barcelone. // A good knowledge of the hydraulic behaviour of an urban catchment and its surface drainage system is an essential requirement to guarantee traffic and pedestrian safety. In many cases, inlets have been situated according to spatial density criteria. Indeed a more rational location of inlets on urban catchments must be defined according to an accurate analysis of the relationship between street flow and inlet hydraulic efficiency. Moreover we lack specific hazard criteria in terms of the maximum acceptable flow depths and velocities on the streets that do not cause problems to pedestrians. In this paper the results of two different experimental campaigns are presented. The first was carried out to evaluate inlet hydraulic efficiency; the second was carried out to address the pedestrian stability in urban flood conditions, whose aim was to propose new hazard criteria. On the basis of the experimental results, a methodology was developed to assess flood hazard in urban areas during storm events. If a refined topographic representation of urban areas is available, a two-dimensional numerical simulation of urban flooding can be performed using complete shallow water equations. According to this approach a numerical application for flood hazard assessment in a street of Barcelona is shown.

  • Propuesta de operación mediante control pasivo del canal Xerta-Sénia

     Soler Guitart, Joan; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    Ingeniería del agua
    Date of publication: 2010
    Journal article

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  • Teaching Control of Irrigation Canals to Non System Engineers

     Mantecon Baena, Juan Antonio; Gomez Valentin, Manuel; Rodellar Benede, Jose Julian
    International journal of engineering education
    Date of publication: 2010
    Journal article

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    Estudio de los patrones de colmatación en los sumideros de una cuenca urbana de Barcelona (España)  Open access

     Gomez Valentin, Manuel; Hidalgo Rabaseda, Guillem; Russo, Beniamino
    Congreso Latinoamericano de Hidráulica
    Presentation's date: 2010-11-24
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    Dentro del sistema de drenaje de una ciudad, el sistema de sumideros es el encargado de introducir en la red de alcantarillado las aguas de escorrentía producidas por las tormentas caídas. El diseño de dicho sistema de sumideros, la elección de los modelos adecuados y su ubicación es uno de los puntos fundamentales del sistema de drenaje. La hidráulica de estos sumideros ha recibido atención en los últimos años y cada vez más los fabricantes proporcionan la capacidad hidráulica de captación de cada sumidero. Pero estos datos suelen ser considerando agua limpia, mientras que en la realidad de la cuenca, numerosos sumideros pueden estar total o parcialmente colmatados, hecho que debería ser tenido en cuenta en los diseños. En este trabajo, se presenta una metodología para considerar los efectos hidráulicos sobre el sumidero derivados de la colmatación. A partir de una inspección de los sumideros de una cuenca, se buscan patrones de colmatación, formas repetitivas observadas en la colmatación de los sumideros, y la frecuencia de ocurrencia de los mismos. Se somete a ensayo hidráulico el sumidero colmatado, obteniéndose la cantidad de agua que puede ser captada por cada uno de ellos, y obteniéndose así el factor de reducción en la capacidad de captación a aplicar a cada uno de los patrones de colmatación y que puede ser utilizado en los estudios hidráulicos de escorrentía en la ciudad.

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    Modelo físico para el estudio de los criterios de riesgo en zonas urbanas  Open access

     Gomez Valentin, Manuel; Macchione, Francesco; Russo, Beniamino
    Congreso Latinoamericano de Hidráulica
    Presentation's date: 2010-11-22
    Presentation of work at congresses

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    Las inundaciones en medio urbano son fenómenos que generalmente se caracterizan para su corta duración y para los efectos devastadores debido a la alta concentración de personas, viviendas y bienes localizados en estas áreas. En casos de inundaciones producidas por eventos de lluvias extremos, los caudales de escorrentía pueden circular por las calles de nuestras ciudades de forma incontrolada si el sistema de drenaje superficial o subterráneo es insuficiente generando condiciones de inseguridad para la circulación vehicular y peatonal. Con el fin de estudiar las condiciones de estabilidad de peatones en calles urbanas durante eventos de lluvia, se ha diseñado y realizado un modelo físico que reproduce una calle urbana en escala real. De acuerdo con las capacidades de laboratorio, el protocolo de ensayo establecido ha previsto caudales circulantes hasta 500 l/s y pendientes longitudinales de la calle hasta el 10%. Finalmente se han desarrollado 834 ensayos con 23 sujetos de riesgo en diferentes condiciones de visibilidad y se han recopilados todas las situaciones de riesgo registradas en tres grupos relacionados al nivel de riesgo ocurrido durante los ensayos: bajo, medio y alto riesgo. Los resultados obtenido han evidenciado que para sujetos humanos entre 50 y 60 Kg, y calados entre 9 y 16 cm, velocidades de 1.5-2 m/s pueden suponer una pérdida de estabilidad por efecto de fenómenos como vuelco y deslizamiento. Urban floods are sudden phenomena normally characterized by short flooding durations and devastating effects due to the high concentration of subjects, goods and properties located in urban areas. In these cases of flooding heavy and medium storms events (some times because of inadequate surface drainage systems) generate high uncontrolled amounts of surface runoff that circulate on the urban streets determining a significant hazard for the pedestrians and vehicles. With the aim of studying the stability of the pedestrians in urban areas during storm events, a model representing an urban street in a 1:1 scale, was designed and built. According to the laboratory capabilities a specific testing protocol was established. Specifically tests were carried out for different circulating flows (from 100 l/s to 500 l/s) and different longitudinal slopes (up to 10%). Finally 834 tests regarding 23 human subjects were carried out considering different light conditions too. Hazard conditions were classified into three groups: low, medium and high and parameters at which these conditions occurred were recorded. The obtained results showed that for a human subject with a weight between 50 and 60 Kg, and flow depths between 9 and 16 cm, velocities of 1.5-2 m/s can generate a loss of stability due to phenomena of dragging or overturning.

  • CRITERIOS LIMNOLOGICOS PARA LA GESTION SOSTENIBLE DE EMBALSES. CASOS DE RIBARROJA (RIO EBRO) Y SAU (RIO TER)

     Marti Cardona, Belen; Buil Sanz, Juan Manuel; Felez Gutierrez, Luis Eduardo; Aragón Hernández, José Luis; Gomez Valentin, Manuel; Sanchez Juny, Marti; Blade i Castellet, Ernest; Ramos Fuertes, Anaïs; Dolz Ripolles, Jose
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  • GRUP DE RECERCA FLUMEN

     Horväth, Klaudia; Seco, Raquel Irene; Gutierrez Muñoyerro, Carlos; Ibáñez Paredes, Úrsula Ivette; Marti Cardona, Belen; Concha Jopia, Rodrigo Francisco; Ramos Fuertes, Anaïs; Arbat Bofill, Marina; Corestein Poupeau, Georgina Teresa; Aragón Hernández, José Luis; Russo, Beniamino; Niñerola Chifoni, Daniel; Prats Rodriguez, Jordi; Estrella Toral, Soledad; Buil Sanz, Juan Manuel; Gomez Valentin, Manuel; Pomares Abad, Juan; Sanchez Juny, Marti; Blade i Castellet, Ernest; Sanchez Tueros, Hans Paul; Felez Gutierrez, Luis Eduardo; Dolz Ripolles, Jose
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