Reservoir-induced hydrological changes in the Ebro River basin (NE Spain)

摘要: The Ebro River and its tributaries (North-Eastern Spain) are regulated by over 187 dams, with a total capacity equivalent to 57% of the mean annual runoff. We analysed 38 gauging records from 22 rivers that, virtue location within drainage network period record, would reflect reservoir-induced hydrological changes. Most showed reduction in flood magnitude, Q2 Q10 reduced 30% on average, more higher values impounded runoff index, (calculated as reservoir divided runoff). Annual did not show strong trends, but variability daily flows was most cases due storing winter floods increased baseflows summer for irrigation. Monthly ranged virtually no change post-dam complete inversion seasonal pattern, latter releases irrigation summer, formerly season lowest flows. q 2004 Elsevier Ltd. All rights reserved.