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- In the Vallcebre research catchments, the rainfall-runoff dynamics and runoff generation processes have been studied since 1989, using a hydrometric approach, and environmental tracers (since 2011). Ongoing investigations are focused on improving our understanding of the spatio-temporal variability of the hydrological response and of the dynamics of water fluxes and residence times at the plot and catchment scale. We also combined empirical and modelling approaches at different spatio-temporal scales in order to test hydrological models in Mediterranean conditions and to investigate the hydrological functioning of Mediterranean headwater catchments and their potential alteration due to future land-use and climate changes.
Maps of the catchment‐scale input signal during the beginnig (a), the middle (b) and the end (c) of a 120mm rainfall event. Scenario 1 represents the isotopic input signal for the catchment with the current land use information; Scenario 2 represents the isotopic input signal for a hypothetical catchment completely covered by forest; and Scenario 3 represents the isotopic input signal for a hypothetical catchment completely covered by grassland. (Cayuela et al. 2019, Hydrological Processes)
Time series of daily rainfall and mean daily discharge measured in the Can Vila catchment (May 2011-July 2013). Numbers from 1 to 10 refer to floods sampled for stable isotopes. Old water contribution derived from two-component hydrograph separation (18O) is shown for each flood. Red circles correspond to two floods for which hydrograph separation was not possible because of similar isotopic signals in rainfall and in the stream before the flood. (Latron et al. 2015 Geophysical Research Abstracts Vol. 17, EGU2015-2049; Llorens et al. 2018, Geographical Research Letters)
Soil water potential and water table depth dynamics and spatial pattern of contributing areas observed for characteristic rainfall runoff events during dry, wetting-up and wet conditions. (P = rainfall depth; Cs =storm-flow coefficient). Type A-saturated areas are located at flow convergence sites and result from groundwater rise to the surface. Type B-saturated areas are linked to local soil properties allowing the frequent development of a perched saturated layer. (Latron and Gallart 2007, Journal of Hydrology; Latron and Gallart 2008 Journal of Hydrology; Llorens et al. 2018, Geographical Research Letters)
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