aqua Water Technology Center

Cornellà del Terri, Spain

aqua Water Technology Center

Cornellà del Terri, Spain

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Velasco M.,aqua Water Technology Center | Cabello A.,aqua Water Technology Center | Barrera-Escoda A.,SMC
Natural Hazards and Earth System Sciences | Year: 2013

Global change may imply important changes in the future occurrence and intensity of extreme events. Climate scenarios characterizing these plausible changes were previously obtained for the Llobregat River basin (NE Spain). This paper presents the implementation of these scenarios in the HBV (Hydrologiska Byräns Vattenbalansavdelning) hydrological model. Then, the expected changes in terms of flash flood occurrence and intensity are assessed for two different sub-basins: the Alt Llobregat and the Anoia (Llobregat River basin). The assessment of future flash floods has been done in terms of the intensity and occurrence of extreme events, using a peak over threshold (POT) analysis. For these two sub-basins, most of the simulated scenarios present an increase of the intensity of the peak discharge values. On the other hand, the future occurrence follows different trends in the two sub-basins: an increase is observed in Alt Llobregat but a decrease occurs in Anoia. Despite the uncertainties that appear in the whole process, the results obtained can shed some light on how future flash floods events may occur. © 2013 Author(s).f 0.


Nejjari F.,Polytechnic University of Catalonia | Perez R.,Polytechnic University of Catalonia | Puig V.,Polytechnic University of Catalonia | Quevedo J.,Polytechnic University of Catalonia | And 4 more authors.
Drinking Water Engineering and Science | Year: 2012

This paper proposes a model based detection and localisation method to deal with abnormal quality levels based on the chlorine measurements and chlorine sensitivity analysis in a water distribution network. A fault isolation algorithm which correlates on line the residuals (generated by comparing the available chlorine measurements with their estimations using a model) with the fault sensitivity matrix is used. The proposed methodology has been applied to a District Metered Area (DMA) in the Barcelona network. © Author(s) 2012.


Rodriguez R.,Polytechnic University of Catalonia | Navarro X.,Polytechnic University of Catalonia | Casas M.C.,Polytechnic University of Catalonia | Ribalaygua J.,Fundacion para la Investigacion del Clima | And 3 more authors.
International Journal of Climatology | Year: 2014

The evaluation of the possible climate change influence on extreme precipitation is very interesting in the Mediterranean area due to the usual and characteristic high intensities of its rainfall pattern. This analysis is also very important in urban zones, especially those densely populated with complex sewer systems, generally vulnerable to torrential rainfall. In this work, a total of 114 simulated daily rainfall series, 84 for the period 2000-2099 and 30 for the control period 1951-1999, have been analysed. These series were obtained for six thermo-pluviometric stations located in the metropolitan area of Barcelona using the information provided by five general circulation models under four future climate scenarios of greenhouse gas emissions and applying statistical downscaling methods. The potential changes in the intensity-duration-frequency relationships due to climate change have been investigated. For the last third of the 21st century, under A1B, A2 and B2 climate scenarios, an increase of at least 4% has been found on the expected daily rainfall with return period longer than 20years. Using a temporal downscaling based on scaling properties of rainfall, future hourly extreme rainfall has been estimated. For almost all the scenarios and periods considered, the increase on the expected hourly rainfall has resulted slightly higher than the corresponding daily rainfall. The greatest differences between the future hourly and daily rainfall estimated have been found in the second third of the century under scenarios A1B (8%) and A2 (9%). © 2013 Royal Meteorological Society.


Velasco M.,aqua Water Technology Center | Cabello A.,aqua Water Technology Center | Escaler I.,aqua Water Technology Center | Escaler I.,Aqualogy | And 2 more authors.
Journal of Water and Climate Change | Year: 2014

Global change, including climate, land-use and socio-economic changes, is expected to increase the stress on the entire water cycle. In the Mediterranean region, extreme events are likely to increase due to climate change. This work, framed in the EC Seventh Framework Programme project IMPRINTS, presents a methodology to obtain future flood risk maps using climate and land-use scenarios, identifying the new potential risk zones. The implementation of this methodology is applied to the Llobregat river basin case study. Two different special report on emission scenarios are used, and although the uncertainties are high, the results obtained are coincident: an increase of flood risk is observed in the whole Low Llobregat area. The climate changes affect the basin globally, increasing the risk homogeneously within the area considered. On the other hand, land-use changes represent urban growth in the floodplains, and hence, local risk increases are found in these spots. © IWA Publishing 2014.


Gonzalez S.,aqua Water Technology Center | Lopez-Roldan R.,aqua Water Technology Center | Cortina J.-L.,aqua Water Technology Center | Cortina J.-L.,Polytechnic University of Catalonia
Toxicological and Environmental Chemistry | Year: 2013

Drinking water quality should remain constant from the drinking water treatment plant to the consumer's tap. However, water quality characteristics might be affected by interactions with pipe materials. This review describes the iron, copper, lead, zinc, aluminum, chromium, and cadmium in drinking water leached from the pipe material present in drinking water, as well as the factors and mechanisms that affect leaching processes. Data analysis suggests that monitoring the water quality in distribution systems is important for their proper management; however, the low measured concentrations highlight the need for sensitive sensors. In addition, further research is necessary to anticipate possible future effects before the installation of new materials/infrastructure or changes in water source/treatment. © 2013 Taylor & Francis.


Cabello A.,aqua Water Technology Center | Velasco M.,aqua Water Technology Center | Barredo J.I.,European Commission - Joint Research Center Ispra | Hurkmans R.T.W.L.,Bristol Glaciology Center | And 3 more authors.
Environmental Science and Policy | Year: 2011

The main objective of this work is to identify and evaluate the potential impacts produced by climate and land-use changes in six European test-bed basins (Llobregat, Guadalhorce, Gardon d'Anduze, Linth, Verzasca and Sambuco). Data to build future scenarios that can modify the different basins' flash flood and debris flow risk level has been analyzed in this paper. High resolution climate scenarios have been obtained from several European projects and/or National initiatives, depending on each case. Climatic variables have been widely analyzed, with a special focus on extreme precipitation. Typical generalized extreme value (GEV) distributions have been fitted to observed and projected rainfall data to assess impacts in the frequency distributions of extreme rainfall up to 2100. Regarding climate, the main conclusion is the importance of using data at the maximum spatial and temporal resolution applying downscaling methodologies adapted to basin scale (test-bed areas ranging from approx 200 to 5000km2) and oriented to obtain extreme rainfall values.In general, high variability has been detected, obtaining very different results for the different models and scenarios. Data corrections may lead to better representations of present situations and, therefore, more reliable future projections, but currently some of them are not suitable for extreme precipitation assessment.Regarding land-use changes, a cellular automata-based model has been used (MOLAND) to simulate the 2000-2040 period taking the CORINE land-use dataset as input data. Llobregat, Guadalhorce and Gardon d'Anduze basins have been identified as potentially interesting for simulating urban land-use dynamics due to the existence of important urban areas within their limits. The assessment of the rural land-use changes has been carried out using the results from the EURURALIS project (2000-2030 period), available for all the basins.The results of this paper are framed in the FP7 project IMPRINTS that has the aim of analyzing impacts of future changes to provide guidelines for mitigation and adaptation measures and, in general, to improve the application of the EC Flood Risk Management Directive. © 2011 Elsevier Ltd.


Velasco M.,aqua Water Technology Center | Cabello A.,aqua Water Technology Center | Russo B.,Aqualogy | Russo B.,University of Zaragoza
Urban Water Journal | Year: 2016

This paper presents a detailed flood damage assessment in the Raval district of Barcelona. The implementation of a new 1D-2D coupled model is used to obtain flood depths, and new stage damage curves are developed to estimate the direct tangible damages. The curves have been validated using data from surveys and actual reported damages to the Spanish re-assurance. Finally, combining hazard and vulnerability levels by using a GIS-based toolbox, the expected annual damage of the area is obtained. This enables the determination of the critical points of the district in terms of flooding impacts, and highlights the need to implement strategies to cope with these impacts. © 2015 Taylor & Francis.


Escaler I.,aqua Water Technology Center | Cabello A.,aqua Water Technology Center | Campos C.,Sociedad General de Aguas de Barcelona | Lesjean B.,KompetenzZentrum Wasser Berlin | And 2 more authors.
Journal of Water and Climate Change | Year: 2012

The Water supply and sanitation Technology Platform (WssTP) was initiated by the European Commission in 2004. It is led by industries in collaboration with academics, research organisations and water users to help structure the European Research Area and identify R&D needs for the water sector. In December 2008, the board of the WssTP identified the need to create a Task Force on Climate Change in order to build a working group focused on the issue and able to assist the EU Commission in the related Calls for Projects. The Task Force on Climate Change did a review on the research and technology development (RTD) needs related to each of the WssTP topics, highlighting the challenges they will face in a climate change context. This paper is based on the review carried out and presents its main conclusions. The RTD topics identified involve a broad range of expertise areas and can be divided into two main groups: mitigation and adaptation. The latter will be brought to the fore in this paper. © WSSTP 2012 Journal of Water and Climate Change.

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