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| Titel |
Impact of climate evolution and land use changes on water yield in the ebro basin |
| VerfasserIn |
J. I. López-Moreno, S. M. Vicente-Serrano, E. Morán-Tejeda, J. Zabalza, J. Lorenzo-Lacruz, J. M. García-Ruiz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 1 ; Nr. 15, no. 1 (2011-01-25), S.311-322 |
| Datensatznummer |
250012604
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| Publikation (Nr.) |
 copernicus.org/hess-15-311-2011.pdf |
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| Zusammenfassung |
| In this study the climatic and hydrological trends across 88 sub-basins of
the Ebro River basin were analyzed for the period 1950–2006. A new
database of climate information and river flows for the entire basin
facilitated a spatially distributed assessment of climate-runoff
relationships. It constitutes the first assessment of water yield evolution
across the whole Ebro basin, a very representative example of large
Mediterranean rivers. The results revealed a marked decrease in river
discharges in most of the sub-basins. Moreover, a number of changes in the
seasonality of the river regime was found, resulting from dam regulation and
a decrease in snowpack in the headwaters. Significant and positive trends in
temperature were observed across most of the basin, whereas most of the
precipitation series showed negative coefficients, although the decrease in
magnitude was low. The time evolution of the residuals from empirical models
that relate climate and runoff in each sub-basin provided evidence that
climate alone does not explain the observed decrease in river discharge.
Thus, changes in water yield are associated with an increase in
evapotranspiration rates in natural vegetation, growth of which has expanded
as a consequence of land abandonment in areas where agricultural activities
and livestock pressure have decreased. In the lowlands of the basin the
decrease in water yield has been exacerbated by increased water consumption
for domestic, industrial and agricultural uses. Climate projections for the
end of the 21st century suggest a reduced capacity for runoff generation
because of increasing temperature and less precipitation. Thus, the
maintenance of water supply under conditions of increasing demand presents a
challenging issue requiring appropriate coordination amongst politicians and
managers. |
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