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Open Access item Changes ni stream discahrge and solute dynamics between hillslope and valley-bottom intermittent streams.

Authors:Bernal, Susana
Sabater, Francesc
Issue Date:2012
Publisher:European Geosciences Union
Citation:Hydrology and Earth System Sciences 16(6) : 1595-1605 (2012)
Abstract:To gain understanding on how alluvial zones modify water and nutrient export from semiarid catchments, we compared monthly discharge as well as stream chloride, carbon, and nitrogen dynamics between a hillslope catchment and a valley-bottom catchment with a well-developed alluvium. Stream water and solute fluxes from the hillslope and valley-bottom catchments showed contrasting patterns between hydrological transitions and wet periods, especially for bio-reactive solutes. During transition periods, stream water export decreased >40 % between the hillslope and the valley bottom coinciding with the prevalence of streamto-aquifer fluxes at the alluvial zone. In contrast, stream water export increased by 20–70 % between the hillslope and valley-bottom catchments during wet periods. During transition periods, stream solute export decreased by 34– 97 % between the hillslope and valley-bottom catchments for chloride, nitrate, and dissolved organic carbon. In annual terms, stream nitrate export from the valley-bottom catchment (0.32 ± 0.12 kg N ha −1 yr −1 [average ± standard deviation]) was 30–50 % lower than from the hillslope catchment (0.56 ± 0.32 kg N ha −1 yr −1 ). The annual export of dissolved organic carbon was similar between the two catchments (1.8 ± 1 kg C ha −1 yr −1 ). Our results suggest that hydrological retention in the alluvial zone contributed to reduce stream water and solute export from the valley-bottom catchment during hydrological transition periods when hydrological connectivity between the hillslope and the valley bottom was low.
Description:11 páginas, 4 figuras, 2 tablas.
Publisher version (URL):http://dx.doi.org/10.5194/hess-16-1595-2012
E-ISSNmetadata.dc.identifier.doi = DOI:1607-7938
Appears in Collections:(CEAB) Artículos

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