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Alvaro Sordo   Dr.  University Educator/Researcher 
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Alvaro Sordo published an article in November 2017.
Top co-authors See all
Ana Iglesias-Casal

88 shared publications

Department of Agricultural Economics, Universidad Politécnica de Madrid (UPM), Madrid, Spain

Luis Garrote

74 shared publications

Department of Civil Engineering, Technical University of Madrid, Madrid, 28040, Spain

José M. Carrillo

59 shared publications

Department of Animal Medicine and Surgery, CEU Cardenal Herrera University, Valencia, Spain

M. Dolores Bejarano

7 shared publications

Grupo de investigación en Hidrobiología, Departamento de Ingeniería Forestal; Universidad Politécnica de Madrid; ES-28040 Madrid Spain

Maria Dolores Bejarano

7 shared publications

Landscape Ecology Group; Department of Ecology and Environmental Science; Umeå University; Umeå Sweden

Publication Record
Distribution of Articles published per year 
(2012 - 2017)
Total number of journals
published in
Publications See all
Article 4 Reads 1 Citation Analysis of Current and Future SPEI Droughts in the La Plata Basin Based on Results from the Regional Eta Climate Model Alvaro Sordo-Ward, María Dolores Bejarano, Ana Iglesias, Víc... Published: 04 November 2017
Water, doi: 10.3390/w9110857
DOI See at publisher website ABS Show/hide abstract
We identified and analysed droughts in the La Plata Basin (divided into seven sub-basins) for the current period (1961–2005) and estimated their expected evolution under future climate projections for the periods 2011–2040, 2041–2070, and 2071–2099. Future climate projections were analysed from results of the Eta Regional Climate Model (grid resolution of approximately 10 km) forced by the global climate model HadGEM2-ES over the La Plata basin, and considering a RCP4.5 emission scenario. Within each sub-basin, we particularly focused our drought analyses on croplands and grasslands, due to their economic relevance. The three-month Standardized Precipitation Evapotranspiration Index (SPEI3) was used for drought identification and characterization. Droughts were evaluated in terms of time (percentage of time from the total length of each climate scenario), space (percentage of total area), and severity (SPEI3 values) of cells characterized by cropland and grassland for each sub-basin and climate scenario. Drought-severity–area–frequency curves were developed to quantitatively relate the frequency distribution of drought occurrence to drought severity and area. For the period 2011–2040, droughts dominate the northern sub-basins, whereas alternating wet and short dry periods dominate the southern sub-basins. Wet climate spread from south to north within the La Plata Basin as more distant future scenarios were analysed, due to both a greater number of wet periods and fewer droughts. The area of each sub-basin affected by drought in all climate scenarios was highly varied temporally and spatially. The likelihood of the occurrence of droughts differed significantly between the studied cover types in the Lower Paraguay sub-basin, being higher for cropland than for grassland. Mainly in the Upper Paraguay and in the Upper Paraná basins the climate projections for all scenarios showed an increase of moderate and severe droughts over large regions dedicated to crops and grasses. On the other hand, for the near future, the Lower Uruguay and the River Plata basins showed a decrease of drought severity compared to the current period. Projections suggest an increase in competition among uses in these regions and the need for a potential relocation of certain crops from the northern regions towards cooler regions located in the centre and south. Further research should consider other climate projections and perform high spatial resolution studies in localized areas.
Article 4 Reads 1 Citation Influence of initial reservoir level and gate failure in dam safety analysis. Stochastic approach Ivan Gabriel-Martin, Alvaro Sordo-Ward, Luis Garrote, Luis G... Published: 01 July 2017
Journal of Hydrology, doi: 10.1016/j.jhydrol.2017.05.032
DOI See at publisher website
Article 3 Reads 2 Citations A Parametric Flood Control Method for Dams with Gate-Controlled Spillways Alvaro Sordo-Ward, Ivan Gabriel-Martin, Paola Bianucci, Luis... Published: 28 March 2017
Water, doi: 10.3390/w9040237
DOI See at publisher website ABS Show/hide abstract
The study presents a method which can be used to define real-time operation rules for gated spillways (named the K-Method). The K-Method is defined to improve the performance of the Volumetric Evaluation Method (VEM), by adapting it to the particular conditions of the basin, the reservoir, or the spillway. The VEM was proposed by the Spanish engineer Fernando Girón in 1988 and is largely used for the specification of dam management rules during floods in Spain. This method states that outflows are lower than or equal to antecedent inflows, outflows increase when inflows increase, and the higher the reservoir level, the higher the percentage of outflow increase. The K-Method was developed by modifying the VEM and by including a K parameter which affects the released flows. A Monte Carlo environment was developed to evaluate the method under a wide range of inflow conditions (100,000 hydrographs) and with return periods ranging from one to 10,000 years. The methodology was applied to the Talave reservoir, located in the South-East of Spain. The results show that K-values higher than one always reduce the maximum reservoir levels reached in the dam. For K-values ranging from one to ten, and for inflow hydrographs with return periods higher than 100 years, we found a decrease in the maximum levels and outflows, when compared to the VEM. Finally, by carrying out a dam risk analysis, a K-value of 5.25 reduced the expected annual damage by 8.4% compared to the VEM, which represents a lowering of 17.3% of the maximum possible reduction, determined by the application of an optimizer based on mixed integer linear programming (MILP method).
CONFERENCE-ARTICLE 10 Reads 0 Citations Rule operation model for dams with gate-controlled spillways Alvaro Sordo-Ward, Iván Gabriel-Martin, Paola Bianucci, Andr... Published: 24 November 2016
The 1st International Electronic Conference on Water Sciences, doi: 10.3390/ecws-1-a010
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The study develops a rule operation model for gated spillways which improves the performance of the volumetric evaluation method (MEV). MEV was proposed by Giron (1988) and is largely used in common practice in Spain. The improvement was made by applying a corrective factor to the outflow discharge proposed by MEV method. The choice of the corrective factor was based on a multi-decision environment accounting for the number of improved cases and the amount of improvement. A Monte Carlo simulation environment was created to evaluate the method under a wide range of operating conditions. The environment includes the generation of storms and inflow hydrographs and their routing through the reservoir. The methodology was applied to the Talave basin, in the south-east of Spain. The improved method (called K method) was compared with other methods for the operation of gate-controlled spillways as the MEV and PLEM methods. The results showed that if the corrective factor K is higher than 1 the number of improved cases was significant, while if it is lower than 1 there was not improvement. The analysis of the relation between the return period and the devised method showed that by using the K method the percentage of improvement of both reducing maximum outflows and reducing maximum levels reached in the reservoir is greater for events with higher return periods than for the lower ones.

Article 4 Reads 2 Citations The Influence of the Annual Number of Storms on the Derivation of the Flood Frequency Curve through Event-Based Simulati... Alvaro Sordo-Ward, Paola Bianucci, Luis Garrote, Alfredo Gra... Published: 05 August 2016
Water, doi: 10.3390/w8080335
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This study addresses the question of how to select the minimum set of storms that should be simulated each year in order to estimate an accurate flood frequency curve for return periods ranging between 1 and 1000 years. The Manzanares basin (Spain) was used as a study case. A continuous 100,000-year hourly rainfall series was generated using the stochastic spatial–temporal model RanSimV3. Individual storms were extracted from the series by applying the exponential method. For each year, the extracted storms were transformed into hydrographs by applying an hourly time-step semi-distributed event-based rainfall–runoff model, and the maximum peak flow per year was determined to generate the reference flood frequency curve. Then, different flood frequency curves were obtained considering the N storms with maximum rainfall depth per year, with 1 ≤ N ≤ total number of storms. Main results show that: (a) the degree of alignment between the calculated flood frequency curves and the reference flood frequency curve depends on the return period considered, increasing the accuracy for higher return periods; (b) for the analyzed case studies, the flood frequency curve for medium and high return period (50 ≤ return period ≤ 1000 years) can be estimated with a difference lower than 3% (compared to the reference flood frequency curve) by considering the three storms with the maximum total rainfall depth each year; (c) when considering only the greatest storm of the year, for return periods higher than 10 years, the difference for the estimation of the flood frequency curve is lower than 10%; and (d) when considering the three greatest storms each year, for return periods higher than 100 years, the probability of achieving simultaneously a hydrograph with the annual maximum peak flow and the maximum volume is 94%.
Article 2 Reads 3 Citations How Safe is Hydrologic Infrastructure Design? Analysis of Factors Affecting Extreme Flood Estimation Alvaro Sordo-Ward, Paola Bianucci, Luis Garrote, Alfredo Gra... Published: 01 December 2014
Journal of Hydrologic Engineering, doi: 10.1061/(asce)he.1943-5584.0000981
DOI See at publisher website