http://hdl.handle.net/2117/3258 2013-05-23T02:39:27Z http://hdl.handle.net/2117/14748 Title: Simulación de la onda de avenida por ruptura de tanque de enfriamiento Authors: Fuentes Mariles, Oscar Arturo; Arganis Juarez, Maritza Liliana; Bladé i Castellet, Ernest; Sánchez Juny, Martí; De Luna Cruz, Faustino; Cruz Gerón, Juan Ansberto; Mendoza Facundo, José Enedino; Aragón Hernández, José Luis Abstract: Se llevó a cabo la simulación de la ruptura del borde de un tanque de enfriamiento usando dos métodos: Uno de volúmenes finitos denominado CARPA y un algoritmo en diferencias finitas centradas. El algoritmo en volúmenes finitos CARPA utilizado con el pre y post procesador GiD mostró ser una herramienta muy poderosa en la animación de planicies de inundación, útiles en la interpretación de resultados tanto en el espacio como en el tiempo, para la protección civil, así como para definir las posibles zonas afectadas debido a fenómenos como el de la ruptura de bordos. 2012-01-23T17:32:06Z http://hdl.handle.net/2117/12472 Title: Methodologies to study the surface hydraulic behaviour of urban catchments during storm events Authors: Gómez Valentín, Manuel; Macchione, Francesco; Russo, Beniamino Abstract: 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. 2011-05-05T10:14:14Z http://hdl.handle.net/2117/9933 Title: El binomi aigua i energia Authors: Buil Sanz, Juan Manuel 2010-10-22T13:54:17Z http://hdl.handle.net/2117/9027 Title: Temporal variability in the thermal regime of the lower Ebro River (Spain) and alteration due to anthropogenic factors Authors: Prats Rodríguez, Jordi; Val Segura, Rafael; Armengol, Joan; Dolz Ripollès, Josep Abstract: The Ebro River is one of the longest rivers in Spain and it also has the greatest discharge. Its lower part is highly regulated and includes a system of three reservoirs (Mequinensa, Riba-roja and Flix). The water temperature is altered because of the release of hypolimnetic water and the use of water for cooling at the Ascó nuclear power plant. The thermal regime of the lower Ebro River on different time scales and the changes caused by anthropogenic factors, especially the system of reservoirs and the thermal effluent of the nuclear power plant, have been studied by installing a net of water temperature measuring stations and by using historical water temperature data provided by the thermal power plant at Escatrón. An increase of 2.3ºC in the mean annual water temperature could be demonstrated in the period 1955–2000 at this site. The effects of the system of reservoirs and of the nuclear power plant were the usual for this kind of structures and could be detected many kilometres downstream. In the summer, the cooling effect of the reservoirs and the warming effect of the nuclear power plant compensated each other. In winter, the warming effect of both summed up. 2010-09-22T11:24:48Z http://hdl.handle.net/2117/7456 Title: Benchmark of discharge calibration methods for submerged sluice gates Authors: Sepúlveda Toepfer, Carlos; Gómez Valentín, Manuel; Rodellar Benedé, José Abstract: Real accuracy of several calibration methods for sluice gates working in the submerged orifice flow condition was determined considering water discharge from water levels and gate openings. Data were taken from three gates of the same laboratory canal covering a large operational range. Using accurate hydraulic data, most of the methods produce errors of up to ±10%. However, errors can rise up to ±40% with methods using typically recommended calibration values or constant discharge coefficients. The best results were obtained by a method based on dimensional analysis and the incomplete self-similarity theory proposed recently in the literature. Calibration with field data, in this case, produced errors not higher than ±3%. On the other side, when the gate discharge data are not available, the use of a contraction value of 0.611 within a good theoretical formulation gives very good results. 2010-06-01T09:50:23Z http://hdl.handle.net/2117/6869 Title: L'abastament d'aigua a Catalunya i la seva garantia Authors: Armengol Bachero, Joan; Dolz Ripollès, Josep 2010-04-07T12:42:00Z http://hdl.handle.net/2117/6792 Title: El episodio pluviométrico del 10 de junio en Cataluña: un primer estudio hidrometeorológico Authors: Sempere Torres, Daniel; Corral Alexandri, Carles; Berenguer Ferrer, Marc; Sánchez-Diezma Guijarro, Rafael; Dolz Ripollès, Josep Abstract: En este artículo se estudia el episodio pluviométrico registrado el día 10 de junio de 2000 en Cataluña. En particular se analiza la lluvia caída en la cuenca de 97 km2 correspondiente a la riera de Magarola en su cruce con la autovía N-II en Esparreguera (Barcelona). Para ello se utiliza información de campo obtenida a partir de radar meteorológico, pluviómetros y pluviógrafos. Sobre la mayor parte de la cuenca se recogieron más de 150 mm de lluvia durante el episodio. También prácticamente sobre toda la cuenca cayeron más de 100 mm en dos horas. El cálculo del período de retorno asociado a la lluvia de 24 horas evidencia la naturaleza excepcional del fenómeno. No obstante la información histórica disponible es insuficiente y solo permite realizar estimaciones con una gran incertidumbre. 2010-03-23T19:14:35Z http://hdl.handle.net/2117/6683 Title: Genetic programming and standardization in water temperature modelling Authors: Arganis Juarez, Maritza Liliana; Val Segura, Rafael; Prats Rodríguez, Jordi; Rodríguez, Katya; Domínguez, Ramón; Dolz Ripollès, Josep Abstract: An application of Genetic Programming (an evolutionary computational tool) without and with standardization data is presented with the aim of modeling the behavior of the water temperature in a river in terms of meteorological variables that are easily measured, to explore their explanatory power and to emphasize the utility of the standardization of variables in order to reduce the effect of those with large variance. Recorded data corresponding to the water temperature behavior at the Ebro River, Spain, are used as analysis case, showing a performance improvement on the developedmodel when data are standardized. This improvement is reflected in a reduction of the mean square error. Finally, the models obtained in this document were applied to estimate the water temperature in 2004, in order to provide evidence about their applicability to forecasting purposes. 2010-03-17T15:41:40Z