Confederacion Hidrografica del Ebro

Miranda de Ebro, Spain

Confederacion Hidrografica del Ebro

Miranda de Ebro, Spain
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Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: ENV.2008. | Award Amount: 7.91M | Year: 2009

EuroGEOSS demonstrates the added value to the scientific community and society of making existing systems and applications interoperable and used within the GEOSS and INSPIRE frameworks. The project will build an initial operating capacity for a European Environment Earth Observation System in the three strategic areas of Drought, Forestry and Biodiversity. It will then undertakes the research necessary to develop this further into and advanced operating capacity that provides access not just to data but also to analytical models made understandable and useable by scientists from different disciplinary domains. This concept of inter-disciplinary interoperability requires research in advanced modelling from multi-scale heterogeneous data sources, expressing models as workflows of geo-processing components reusable by other communities, and ability to use natural language to interface with the models. The extension of INSPIRE and GEOSS components with concepts emerging in the Web 2.0 communities in respect to user interactions and resource discovery, also supports the wider engagement of the scientific community with GEOSS as a powerful means to improve the scientific understanding of the complex mechanisms driving the changes that affect our planet.

Alonso E.E.,Polytechnic University of Catalonia | Olivella S.,Polytechnic University of Catalonia | Soriano A.,Technical University of Madrid | Pinyol N.M.,Polytechnic University of Catalonia | Esteban F.,Confederacion Hidrografica del Ebro
Geotechnique | Year: 2011

Lechago dam (Teruel, Spain) is a 40 m high zoned earth and rockfill dam sitting on soft continental deltaic deposits. A relatively narrow central clay core is stabilised by wide rockfill shoulders. The dam was well instrumented and continuous records of stress development, pore-water pressures and vertical displacements are available for the construction period. Compaction conditions were followed by means of laboratory and in situ control tests. Core clay material was investigated by means of tests performed on compacted specimens of tertiary clays. Rockfill samples were excavated in outcrops of highly fractured Cambrian quartzitic shale. A testing programme on compacted rockfill gravels was conducted under relative humidity control in a large-diameter oedometer and triaxial cells. A coupled finite-element model has been developed to analyse the tests performed and dam behaviour during construction. Model predictions, essentially based on laboratory tests, are compared with measurements during construction. The predicted response of the dam under an assumed programme of impounding is also given. In the future, once impounding occurs, it will be possible to compare these predictions with actual dam performance. The paper provides an integrated description of the dam design, construction and early behaviour. It presents a procedure to interpret available data (laboratory as well as in situ data) on compacted materials from the perspective of modern constitutive models. It also provides an evaluation of the capabilities of advanced numerical tools to reproduce the measured dam behaviour.

Aguilar J.V.,Confederacion Hidrografica del Ebro | Langarita P.,Confederacion Hidrografica del Ebro | Rodellar J.,Polytechnic University of Catalonia | Linares L.,Consulting Engineer | Horvath K.,Technical University of Delft
Water Resources Management | Year: 2016

Predictive control is one of the most commonly used control methods in a variety of application areas, including hydraulic processes such as water distribution canals for irrigation. This article presents the design and application of predictive control for the water discharge entering into an irrigation canal located in Spain. First, a discrete time linear model of the process is described and its parameters are experimentally identified. The model is well validated within the usual canal operating range and is used to formulate a predictive control law with an incremental formulation. Finally, experimental and simulation results are presented in which predictive control has shown better performance than a well-tuned proportional, integral and derivative controller to automatically manage demanded water discharges. © 2016 The Author(s)

Abaurrea J.,University of Zaragoza | Asin J.,University of Zaragoza | Cebrian A.C.,University of Zaragoza | Garcia-Vera M.A.,Confederacion Hidrografica del Ebro
Journal of Hydrology | Year: 2011

This work proposes a methodology for characterizing the time evolution of water quality time series taking into consideration the inherent problems that often appear in this type of data such as non-linear trends, series having missing data, outliers, irregular measurement patterns, seasonal behavior, and serial correlation. The suggested approach, based on regression models with a Gaussian autoregressive moving average (ARMA) error, provides a framework where those problems can be dealt with simultaneously. Also the model takes into account the effect of influential factors, such as river flows, water temperature, and rainfall.The proposed approach is general and can be applied to different types of water quality series. We applied the modeling framework to four monthly conductivity series recorded at the Ebro river basin (Spain). The results show that the model fits the data reasonably well, that time evolution of the conductivity series is non-homogeneous over the year and, in some cases, non-monotonic. In addition, the results compared favorably over those obtained using simple linear regression, pre-whitening, and trend-free-pre-whitening techniques. © 2011 Elsevier B.V.

Tornes E.,Catalan Institute for Water Research | Tornes E.,University of Girona | Perez M.C.,Phytoplankton Consultant | Duran C.,Confederacion Hidrografica del Ebro | And 2 more authors.
Science of the Total Environment | Year: 2014

Water hydrology, temperature and transparency, as well as nutrient retention downstream of the reservoirs alter the temporal and spatial distribution patterns of phytoplankton communities in regulated rivers. The seasonal dynamics of phytoplankton communities in the Ebro was analysed in contrasting water flow periods in sections upstream and downstream of three large reservoirs, as well as in an intermediate site. Phytoplankton communities changed in response to seasonal variations in the areas not influenced by the reservoirs, but the phytoplankton distribution downstream of the reservoirs was driven by their particular hydrodynamics. The change in environmental conditions promoted by reservoirs influenced the pattern of replacement between diatoms and green algae of the upstream section. Differences in the phytoplankton community structure, abundance and environmental variables between upstream and downstream sites were maximal during low flow periods. Chlorophytes and dinoflagellates were present during low flow periods upstream of the reservoirs and in the intermediate site. Cocconeis cf. placentula characterized the downstream section, associated to the presence of macrophytes in that section. The present study sheds light on the consequences of river regulation under potential scenarios of climate change, and results could be used to anticipate ecological problems in large regulated rivers under these circumstances. © 2013 Elsevier B.V.

Ibanez C.,IRTA Aquatic Ecosystems | Alcaraz C.,IRTA Aquatic Ecosystems | Caiola N.,IRTA Aquatic Ecosystems | Rovira A.,IRTA Aquatic Ecosystems | And 6 more authors.
Science of the Total Environment | Year: 2012

The lower Ebro River (Catalonia, Spain) has recently undergone a regime shift from a phytoplankton-dominated to a macrophyte-dominated system. This shift is well known in shallow lakes but apparently it has never been documented in rivers. Two initial hypotheses to explain the collapse of the phytoplankton were considered: a) the diminution of nutrients (bottom-up); b) the filtering effect due to the colonization of the zebra mussel (top-down). Data on water quality, hydrology and biological communities (phytoplankton, macrophytes and zebra mussel) was obtained both from existing data sets and new surveys. Results clearly indicate that the decrease in phosphorus is the main cause of a dramatic decrease in chlorophyll and large increase in water transparency, triggering the subsequent colonization of macrophytes in the river bed. A Generalized Linear Model analysis showed that the decrease in dissolved phosphorus had a relative importance 14 times higher than the increase in zebra mussel density to explain the variation of total chlorophyll. We suggest that the described changes in the lower Ebro River can be considered a novel ecosystem shift. This shift is triggering remarkable changes in the biological communities beyond the decrease of phytoplankton and the proliferation of macrophytes, such as massive colonization of Simulidae (black fly) and other changes in the benthic invertebrate communities that are currently investigated. © 2011 Elsevier B.V.

Aparicio E.,United Research Services S.L. | Aparicio E.,University of Girona | Pintor C.,Confederacion Hidrografica del Ebro | Duran C.,Confederacion Hidrografica del Ebro | Carmona-Catot G.,University of Girona
Limnetica | Year: 2012

Fish passage at artificial barriers is necessary for the conservation of healthy fish stocks. The first barrier that migratory fish encounter when ascending the Ebro River is the Xerta Weir, where a pool-type fishway was constructed in 2008. From 2007 to 2010, boat electrofishing surveys were conducted in the Ebro River downstream of the Xerta Weir to assess the potential pool of species that could use the fishway. Nine native and 12 exotic species were captured, the latter comprising 62 % of the relative abundance and 70 % of the biomass. A combination of video recording, electrofishing and trapping was used to assess the effectiveness of the fishway in facilitating the passage of fish. Eight species were detected using the fishway, of which five were native (Liza ramada, Anguilla anguilla, Barbus graellsii, Gobio lozanoi and Salaria fluviatilis) and three exotic (Alburnus alburnus, Cyprinus carpio and Rutilus rutilus). Only L. ramada used the fishway in substantial numbers. The rate of fish passage was the highest from June to August and decreased afterwards. The effectiveness of the fishway might be lowered by areas of turbulence within the fishway and by distraction flows from a nearby hydropower station. © Asociacion Iberica de Limnologia, Madrid. Spain.

Borobia O.Z.,Confederacion Hidrografica Del Ebro | Morcillo J.M.M.,S.A. INCISA
Dam Maintenance and Rehabilitation II - Proceedings of the 2nd International Congress on Dam Maintenance and Rehabilitation | Year: 2011

The Las Torcas Dam, in service since 1948, is the cornerstone of the regulatory system of the Huerva river, which also has the Mezalocha dam downstream. In its current state it has rather strict profile of gravity and a limited capacity spillway. It is also noted that there is not a guarantee of water supply for irrigation of the middle and lower river basin, so arises the need for its regrowth. Even if it is not necessary to increase the volume of exploitation, messures should be put in place to improve dam safety (increasing the discharge capacity of spillway, having drainage and inspection galleries, ...). As a result of researching the issue, it has been decided that the most suitable solution for regrowth downstream is an additional height of 14,30 m, resulting in a total height of 52 m. © 2011 Taylor & Francis Group, London.

Ferrer Castillo C.,Confederacion Hidrografica Del Ebro | Moreno Santaengracia M.L.,Confederacion Hidrografica Del Ebro
Dam Maintenance and Rehabilitation II - Proceedings of the 2nd International Congress on Dam Maintenance and Rehabilitation | Year: 2011

Gauge stations, as a part of a hydrologic network, are the essential tools to obtain an accurate knowledge of the water flowing through rivers and channels. The choice of a suitable location, typology, instrumentation and maintenance of gauge stations allows, together with a meticulous and systematic calibration, to get precise real data about the discharge evolution in chosen control sections. In particular, good quality hydrometric data are the basis not only to design dams, making appropriate its reservoir capacity and outlet devices to each catchment basin, but also to optimise exploitation through an effective water resource management, including flood situations, provided by an Automatic Hydrologic Information System (SAIH) and a Decision Support System (DSS). This operational tool in the Ebro river basin collects meteorological forecasts and observed data (rainfall, temperature, river flows from the gauge stations and reservoir water levels and outflows) and use hydrological and hydraulic models, besides reservoir operation, to obtain flood forecasts. © 2011 Taylor & Francis Group, London.

Mariscal De Gante Lopez A.,Confederacion Hidrografica Del Ebro
Dam Maintenance and Rehabilitation II - Proceedings of the 2nd International Congress on Dam Maintenance and Rehabilitation | Year: 2011

Alloz dam, its reservoir and foot reservoir are located in the Foral Community of Navarra. Inagurated in 1930, it regulates the headwaters of the river Salado, providing resources for irrigation in the area and for the production of electricity. It is one of the first double-curved arch dams built in Spain. Due both to the need for adaptation of its elements to the new standards as well as to solve several problems arising from their exploitation, it has been necessary to undertake several remedial measures which are described in this paper (operation of bottom drains, fitting of the restitution channel and recovery of the river reach downstream from the foot reservoir and repair of irrigation intake after the avenue of 2007). © 2011 Taylor & Francis Group, London.

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