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Title: Influences of the stream groundwater hydrology on nitrate concentration in unsaturated riparian area bounded by an intermittent Mediterranean stream
Author: Butturini, Andrea
Bernal Berenguer, Susana
Nin, E.
Hellin, C.
Rivero Marginedas, Lluís
Sabater, Sergi
Sabater i Comas, Francesc
Keywords: Hidrologia d'aigües subterrànies
Química de l'aigua
Ecologia fluvial
Montnegre (Catalunya : Massís)
Groundwater hydrology
Water chemistry
Stream ecology
Montnegre Mountains (Catalonia)
Issue Date: 2003
Publisher: American Geophysical Union
Abstract: Stream aquifer hydrology and nitrate removal were studied, over a period of 2 years, in an unsaturated riparian zone, bounded by an intermittent Mediterranean stream, (Fuirosos, northeastern Spain). The riparian groundwater system is characterized by drastic hydrological changes and by mixing of stream water with hillslope groundwater. The hillslope groundwater flowed through a medium with low hydraulic conductivity (9.6 10 - 3 < k s < 0.1 m d - 1 ) and low specific discharges (1.7 10 - 3 < q h l l < 15 10 - 3 m d - 1 ). In contrast, stream water infiltrated through the near stream porous medium with relatively high hydraulic conductivity (4.8 < k s < 19 m d - 1 ) and variable specific discharges (i.e., 0.03 < q s t < 1.5 m d - 1 ). An intense and short stream discharge period occurred in autumn, when stream water infiltrated a maximum of 10 m into the riparian zone. Nitrate concentration and nitrate removal spatial rates (η N O 3 ) showed wide spatial heterogeneity. Higher nitrate concentrations (3.4 NO 3 -N mg L - 1 ) and effective nitrate removal (η N O 3 = 0.098 ′ 0.04 m - 1 ) were found in the deep groundwater of hillslope zone associated to low water fluxes. In contrast, in the stream edge zone (with higher water fluxes), nitrate release predominated over depletion (η N O 3 = -0.13 ′ 0.04 m - 1 ) during the stream discharge period. This opposite pattern of nitrate removal observed in the study area suggests that the depletion of diffuse nitrate inputs in riparian zones bounded by intermittent streams requires careful consideration.
Note: Reproducció digital del document publicat a
It is part of: Water Resources Research, 2003, vol 39, núm. 4 , p. 12-1-12-13
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ISSN: 0043-1397
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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