River regimes and recent hydrological changes in the Duero basin (Spain)

Morán-Tejéda, Enrique; López‐Moreno, Juan I.; Barbancho, Antonio Ceballos; Vicente‐Serrano, Sergio M.

doi:10.1016/j.jhydrol.2011.04.034

Cited by 64 publications

(46 citation statements)

References 54 publications

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“…In this research we used principal component analysis (PCA) in S mode to define regions where the temporal variation of the hydrological variables (standardized stramflow index evolution at the 187 gauging stations) had the same pattern (the observation stations were the variables, and the time observations the cases). The PCA technique is widely used by hydrologists to analyze the spatiotemporal variability of hydrological variables (Preisendorfer, 1988;Kalayci and Kahya, 2006; Kahya et al, 2008;Morán-Tejeda et al, 2011;Peterson et al, 2011); it allows for retention of common features of the samples and identification of local peculiarities. Using this approach we obtained an additional non-correlated set of variables that were the linear combinations of the originals.…”

Section: Regionalizationmentioning

confidence: 99%

Streamflow droughts in the Iberian Peninsula between 1945 and 2005: spatial and temporal patterns

Lorenzo‐Lacruz¹,

Morán-Tejéda²,

Vicente‐Serrano³

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. In this study we analyzed the spatiotemporal variability of streamflow droughts in the Iberian Peninsula from 1945 to 2005. Streamflow series belonging to 187 homogeneously distributed gauging stations across the study area were used to develop a standardized streamflow index (SSI), which facilitated comparison among regimes and basins, regardless of streamflow magnitudes. A principal component analysis was performed to identify homogeneous hydrological regions having common features based on the temporal evolution of streamflows. Identification of drought events was carried out using a threshold level approach. We assessed the duration and magnitude of drought episodes and the changes that occurred between two contrasting periods for each hydrological region. The results showed a trend toward increased drought severity in the majority of regions. Drought duration, magnitude and spatial coverage were found to depend mainly on climatic conditions and the water storage strategies in each basin. In some basins these strategies have altered river regimes, and in others created a high level of dependence on storage and water transfer rates.

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Section: Regionalizationmentioning

confidence: 99%

Streamflow droughts in the Iberian Peninsula between 1945 and 2005: spatial and temporal patterns

Lorenzo‐Lacruz¹,

Morán-Tejéda²,

Vicente‐Serrano³

et al. 2013

Hydrol. Earth Syst. Sci.

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“…Recent studies have demonstrated a negative trend in the occurrence of snow days in the northwest of the Iberian Peninsula (Pons et al 2009), and a substantial decrease in the duration and depth of the snowpack, which is causing a decrease and shift in spring peak flows (López-Moreno 2005, López-Moreno et al 2008. Snowmelt is a general component of river regimes in the headwaters of the Duero basin (Morán-Tejeda et al 2011b), and the decrease of spring high flows is likely to be related to the reduction in snowpack given the increasing temperatures documented in the region in recent decades. (Esteban-Parra et al 1995, Morales et al 2005.…”

Section: Discussionmentioning

confidence: 99%

The contrasted evolution of high and low flows and precipitation indices in the Duero basin (Spain)

Morán-Tejéda

López‐Moreno

Vicente‐Serrano

et al. 2012

Hydrological Sciences Journal

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“…Precipitation shows a marked seasonality. It peaks roughly in autumn and winter and decreases in spring to its lowest amounts in summer [Moran-Tejeda et al, 2011c]. Precipitation from October to December generates soil water reserves and runoff.…”

Section: The Duero Basinmentioning

confidence: 99%

“…Precipitation from October to December generates soil water reserves and runoff. The dry period coincides with warm temperatures in summer [Moran-Tejeda et al, 2011c]. Summer drought conditions affect 90% of the surface of the Duero river basin [Moratiel et al, 2011].…”

Section: The Duero Basinmentioning

confidence: 99%

Spatial assessment of precipitation deficits in the Duero basin (central Spain) with multivariate extreme value statistics

2013

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[1] Nonirrigated agriculture on the Iberian Peninsula is regularly affected by dry periods that can cause important losses. This paper focuses on the comparison of the classical Standard Precipitation Index (SPI) with a fragility index developed by the multivariate extreme value theory community, which is used to describe monthly precipitation deficits below 30.5 mm (about 1 mm/d) in the Spanish Duero basin. The multivariate extreme value model allows to capture relevant information concerning the dependence structure among extreme precipitation deficits. Maps of those extremal dependence summaries and of loadings of principal components of the SPI provide quantitative information for water management. In addition, jointly analyzing data from several stations improves the inference of uncertainty. Spatial patterns of extremal dependence emerged with respect to orographic features. Most severe dry spells occur in the southeast of the Duero basin. In central plain of the Duero basin, a predominantly agricultural area, a strong fragility index for severity of dry spells is particularly found in eastern regions. Results of the MEVT and SPI analysis point in the same direction. Beyond this, the MEVT assessment gives a quantitative measure of the dependence between stations and regions. Estimates of return periods for extreme dry spell severity are discussed. Deficits below 42.7 mm are also analyzed.Citation: Kallache, M., P. Naveau, and M. Vrac (2013), Spatial assessment of precipitation deficits in the Duero basin (central Spain) with multivariate extreme value statistics, Water Resour. Res., 49,[6716][6717][6718][6719][6720][6721][6722][6723][6724][6725][6726][6727][6728][6729][6730]

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River regimes and recent hydrological changes in the Duero basin (Spain)

Cited by 64 publications

References 54 publications

Streamflow droughts in the Iberian Peninsula between 1945 and 2005: spatial and temporal patterns

Streamflow droughts in the Iberian Peninsula between 1945 and 2005: spatial and temporal patterns

The contrasted evolution of high and low flows and precipitation indices in the Duero basin (Spain)

Spatial assessment of precipitation deficits in the Duero basin (central Spain) with multivariate extreme value statistics

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