Hydroelectric Power Plant

Le projet a beaucoup évolué depuis un an. Tout le mérite de l'avoir conçu et outillé revient à France Richer, découvreuse du site BhFn-32, qui a ouvert son quai et sa maison à nous depuis 2017. Que Marie Trottier et Alex Lefrançois-Leduc soient vivement remerciés ici de leur engagement tous azimuts. Le projet a eu le soutien du CRSH dans le cadre du projet « La forêt sous l'eau », de l'Équipe FRQSC ArchéoSciences-ArchéoSociale (AS 2), et du Département d'anthropologie de l'Université de Montréal. Une reconnaissance toute particulière va à la communauté qui fut si nombreuse à la journée de conférences le 13 janvier 2026, et non le moindre, aux étudiantes et étudiants qui font vivre ce projet.

In the Southeastern Black Sea Region, rivers are dammed for hydroelectric power and irrigation. The natural course of fluvial alluvium transport is almost completely altered because of planned and constructed dams and coastal protection measures. Decreasing volume of sediment carried to the sea cause intensification of the shore erosion. The Black Sea Rivers and coastal areas of Turkey and Georgia are under heavy anthropogenic pressure because of the bed material extraction and coastal erosion rate. In this study, environmental effects of dams and related effects of sediment transport on coastal erosion in the Eastern Black Sea region are discussed.

Fil: Sosnovsky, Alejandro. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Grupo de Evaluacion y Manejo de Recursos Icticos; Argentina

Os recursos hídricos constituem um dos elementos naturais mais importantes para a sobrevivência humana e para o desenvolvimento das sociedades, desempenhando um papel fundamental nas dimensões económica, social e ambiental. Angola apresenta uma considerável disponibilidade de recursos hídricos, caracterizada por uma vasta rede de rios, lagos e aquíferos, que sustentam actividades como a agricultura, o abastecimento de água potável, a produção de energia e a preservação dos ecossistemas. No entanto, apesar dessa riqueza, persistem desafios significativos relacionados com a gestão, o acesso e o uso sustentável da água, sobretudo em algumas províncias do país. Neste contexto, o presente artigo tem como objectivo analisar a importância dos recursos hídricos de Angola para o desenvolvimento económico, social e ambiental, com enfoque específico na Província do Huambo. Metodologicamente, o estudo baseia-se numa abordagem qualitativa, recorrendo à pesquisa bibliográfica e documental, sustentada em autores clássicos da Hidrogeografia e da metodologia de investigação científica. Os resultados evidenciam que, embora o Huambo possua um relevante potencial hídrico, a gestão inadequada e a distribuição desigual da água limitam o seu contributo para o desenvolvimento sustentável. Conclui-se que a valorização e a gestão eficiente dos recursos hídricos são fundamentais para a melhoria das condições de vida da população e para o desenvolvimento sustentável da província e do país em geral.

Se presenta la optimización de las temperaturas de operación y la producción de potencia mecánica y de refrigeración para una planta basada en una mezcla de amoníaco y agua, bajo las condiciones ambientales del nordeste argentino. Los balances de energía y materia para el ciclo en conjunto con las ecuaciones de la geometría solar, los datos de fábrica de colectores de tubos al vacio y los datos meteorológicos de Resistencia constituyen un sistema de ecuaciones que se resolvió con un software que incorpora correlaciones de las propiedades termofísicas de la mezcla. Al aumentar la temperatura de sobrecalentamiento se incrementó la potencia mecánica y disminuyó la frigorífica. El rendimiento exergético aumentó hasta cerca del 67% mientras el térmico y la relación de trabajo disminuyeron. Se determinó la producción horaria de potencia mecánica y de refrigeración para días típicos de los meses de verano y de invierno.

The Common Meuse reach is strongly influenced by the operation of a hydropower plant at the upstream weir of Lixhe, especially during periods of low flow. Ecologically based in‐stream flow requirements and fluctuation thresholds have already been determined for this reach by reconstruction of the natural discharge course from historic and actual reference conditions. Nevertheless, more evidence from the present biota at risk has been demanded. This study therefore attempts to define boundary conditions for the low flow regime from the analysis of riparian ground beetles in this river reach. To achieve this, reference conditions for the hydroregime aspects of flow variation were determined. Then, using the habitat templet approach, the hydropeaking pressure was related to biological quality elements. Finally, after detecting the impact on the specific gravel bar ground beetles, thresholds and boundary conditions were determined for the hydropeaking pressure in peak velocity. Copyrigh...

This paper presents a dual approach to solve the short term hydrothermal scheduling (STHS) problem for systems under pool-bilateral markets. First of all, the bilateral transactions and the spot market trades are discriminated in the STHS model. Subsequently, the resulting problem is decomposed into one hydro and a set of electrical and thermal subproblems. The subproblems are solved analytically or by a primal-dual interior point method, whereas the dual problem is solved via bundle method. The commitment status of the generating units is considered known and an augmented Lagrangian is used to define the dual problem. Performance indices are used to analyze the potential of chosen combinations of pool and bilateral trades. The performance of the bundle method is compared to that of a conjugate gradient method. Results are presented for two test systems.

The north Patagonian lakes in their original stage were characterized by their marked oligotrophy, with high abundance of mixotrophic ciliates in lakes with native forest in their surrounding basins. Nevertheless, in the last decades, it was a replace of native forest of different kind of human activities, such as towns and agricultural zones, that generate a transition from oligotrophy to mesotrophy, being replaced the mixotrophic ciliates by different kind of phytoplankton. The aim of the present study was to propose a descriptive model using remote sensing techniques for determining the best model for predict the mixotrophic ciliates abundance in two North Patagonian Chilean lakes. In studies sites, only Caburgua lake has mixotrophic ciliates, that belong to the species Ophyridium naumanni, Stentor amethystinus and S. araucanus, whereas Villarrica lake has not mixotrophic ciliates. The multiple regression analysis revealed that for O.naumanni and S. amethystinus have significant direct associations between temperature, B01, B07 reflectances, S. araucanus abundances, and inverse associations with B02, B04 and B07, and the abundance of both species was significantly inverse. Finally, for S. araucanus was positive associations with B04 and S. amethystinus. The exposed results would be similar to the first descriptions of mixotrophic ciliates abundances for Argentinean and

Short-term hydro generation optimal scheduling of cascade hydropower stations is a typical nonlinear programming problem that minimizes the deviation between the produced power and the grid requirement while satisfying hydraulic and electrical constraints. In this work, the main objective is to find the optimal hourly water discharge rate of each hydro station in a multi-reservoir system to minimize the power deficit. The demanded load is then distributed among the working units of three cascade hydropower stations constructed on Litaini River -Lebanon: Markaba, Awali and Charles Helou. To achieve our goal, methods involving and joining data mining and mathematical programming will serve as a base for a Decision Support Tool (DST). Based on the DST features, a distributed control structure is implemented using a multiple software framework. MATLAB is used for mathematical optimization while LabVIEW is employed to develop Human Machine Interface (HMI) for sequential control.

Traditionally, the decision criteria when analyzing hydropower plants projects, has been based mostly on technical and economical analyses focused on the electric production aspects. Nowadays a broader approach is necessary, which takes into consideration multiple impacts such as:

RiverWare is a reservoir management modeling framework for optimization and simulation of multipurpose reservoirs developed at the University of Colorado Center for Advanced Decision Support for Water and Environmental Systems. R&D is sponsored by the Bureau of Reclamation, the Tennessee Valley Authority (TVA) and the U.S. Army Corps of Engineers, and it is used extensively by numerous water management agencies, utilities, research institutions and consultants for planning, analyzing and operating river and reservoir systems. In this paper we illustrate RiverWare’s capabilities with TVA’s daily operations scheduling models which optimize hydropower value while meeting non-power objectives. The Tennessee Valley Authority (TVA) is a multipurpose federal corporation which owns and operates 29 conventional hydropower plants and one pumped storage hydropower plant in the Tennessee Valley. The Tennessee Valley watershed covers 40,000 square miles in seven states in the Southeast. In addit...

Although the amount of energy produced by this means has steadily increased, the amount produced by other types of power plants has increased at a faster rate and hydroelectric power presently supplies about 14% of the electrical generating capacity of Turkey. Turkey has a total gross hydropower potential of 433 GWh/year, but only 125 GWh/year of the total hydroelectric potential of Turkey can be economically used. Hydropower plants with an installed capacity of below 10 MW are widely considered small hydropower (SHP) in Turkey. Installed capacity at the end of 2015 was approximately 3686 MW with a total economically feasible potential capacity estimated at 6,500 MW indicating approximately 17.8% has been developed. This paper discusses the small hydropower situation in Turkey.

Desde el año 2000, Nucleoeléctrica Argentina (inicialmente en colaboración con grupos de la Comisión Nacional de Energía Atómica) comenzó a desarrollar un modelo representativo de los sistemas de la Central Nuclear Embalse para simular transitorios de planta con el código termohidráulico CATHENA. El programa, desarrollado en Canadá, utiliza una representación unidimensional de dos fluidos en no equilibrio para modelar el refrigerante en doble fase. Está particularmente diseñado para la simulación de transitorios en reactores con canales horizontales tipo CANDU, donde la transferencia de calor debe tener en cuenta el detalle de los manojos combustibles. La versión actual del modelo está basada en documentación (isométricos, planos, especificaciones de programas, manuales de diseño y operación, etc.) propios de la Central Embalse. Se hallan representados en el modelo: el Sistema Primario de Transporte de Calor (núcleo, colectores, alimentadores, bombas, generadores de vapor), el Sistema Secundario de Transporte de Calor (sistema de precalentamiento de agua de alimentación a los generadores de vapor, generadores de vapor, líneas de vapor vivo),

Desde el ano 2000, Nucleoelectrica Argentina (inicialmente en colaboracion con grupos de la Comision Nacional de Energia Atomica) comenzo a desarrollar un modelo representativo de los sistemas de la Central Nuclear Embalse para simular transitorios de planta con el codigo termohidraulico CATHENA. El programa, desarrollado en Canada, utiliza una representacion unidimensional de dos fluidos en no equilibrio para modelar el refrigerante en doble fase. Esta particularmente disenado para la simulacion de transitorios en reactores con canales horizontales tipo CANDU, donde la transferencia de calor debe tener en cuenta el detalle de los manojos combustibles. La version actual del modelo esta basada en documentacion (isometricos, planos, especificaciones de programas, manuales de diseno y operacion, etc.) propios de la Central Embalse. Se hallan representados en el modelo: el Sistema Primario de Transporte de Calor (nucleo, colectores, alimentadores, bombas, generadores de vapor), el Siste...

Elektrárenský svaz stredolabských okresu, LLC (in English “The Power Plant Union of the Central Labe (Elbe)” districts, which will be referred to here as “ESSO”), came into existence in 1916 in response to growing interest in electrification of the surroundings of Kolín. The Union was an extension of Križík’s earlier activities. Most of the power was produced by Križík’s power plant, which was extensively refurbished between 1919 and 1923. In 1919, the hydroelectric power plant in Podebrady was connected to the mains. Between 1924 and 1935, the Union gradually took over the hydroelectric power stations in Nymburk (1924), Kolín (1931), and Prelouc (1935). The Union´s most extensive project for a new steam power plant located in Kolín was initiated in 1929. The first stage of construction of the power plant was completed in 1932. It should be noted that the structure was designed by the well-known architect Jaroslav Fragner. The Union significantly influenced the electrification proce...

Elektrárenský svaz středolabských okresů, LLC (in English "The Power Plant Union of the Central Labe (Elbe)" districts, which will be referred to here as "ESSO"), came into existence in 1916 in response to growing interest in electrification of the surroundings of Kolín. The Union was an extension of Křižík's earlier activities. Most of the power was produced by Křižík's power plant, which was extensively refurbished between 1919 and 1923. In 1919, the hydroelectric power plant in Poděbrady was connected to the mains. Between 1924 and 1935, the Union gradually took over the hydroelectric power stations in Nymburk (1924), Kolín (1931), and Přelouč (1935). The Union s most extensive project for a new steam power plant located in Kolín was initiated in 1929. The first stage of construction of the power plant was completed in 1932. It should be noted that the structure was designed by the well-known architect Jaroslav Fragner. The Union significantly influenced the electrification process for the central Labe district and its surroundings. The Union also successfully extended the number of electricity users. In addition, its activities raised the standard of living of the local citizens. The Union, which had already been nationalized, ceased to exist in 1950.