Abstract
ABSTRACT We studied seasonal differences in the hydrological connectivity between a stream and the different hydrological compartments of a high mountain catchment, analyzing the hysteresis patterns during storm events. Stream water was sampled with autosamplers to capture an entire rainfall event at 2 sites at different altitudes during the snow-free season. Stream solute concentration (C) – discharge (Q) hysteresis patterns changed over the season, in parallel with indicators of the hydrological connectivity in the catchment. We present a numerical model based on 3 end-members (atmospheric water and shallow and deep groundwater) to reproduce the observed changes in hysteresis by simulating stages with increased connectivity. The hydrological connectivity of the catchment increased with precipitation, dependent on the level of recharge of the non-surface compartments. Our results highlight the importance of groundwater in forming streamflow in high mountain catchments and how connectivity influences solute transport pathways.
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