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| Titel |
The influence of riparian-hyporheic zone on the hydrological responses in an intermittent stream |
| VerfasserIn |
A. Butturini, S. Bernal, S. Sabater, F. Sabater |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 6, no. 3 ; Nr. 6, no. 3, S.515-526 |
| Datensatznummer |
250003568
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| Publikation (Nr.) |
 copernicus.org/hess-6-515-2002.pdf |
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| Zusammenfassung |
| Stream
and riparian groundwater hydrology has been studied in a small intermittent
stream draining a forested catchment for a system representative of a
Mediterranean climate. The relationship between precipitation and stream runoff
and the interactions between stream water and the surrounding riparian
groundwater have been analysed under a wide spectrum of meteorological
conditions. The hypothesis that the hydrological condition of the near-stream
groundwater compartment can regulate the runoff generation during precipitation
events was tested. Stream runoff is characterised by a summer dry period, and
precipitation input explained only 25% of runoff variability over the study
period (r2 =0.25, d.f.=51, p<0.001). The variability of
precipitation v. stream runoff is explained partly by the hydrogeological
properties of the riparian near-stream zone. This zone is characterised by high
hydrological conductivity values and abrupt changes in groundwater level in
summer. The summer dry period begins with a rapid decrease in near-stream
groundwater level, and ends just after the first autumnal rain when the original
groundwater level recovers suddenly. Within this period, storms do not cause
major stream runoff since water infiltrates rapidly into the riparian
compartment until it is refilled during the subsequent winter and spring; then
the precipitation explains the 80% of the stream runoff variability
(r2=0.80, d.f.=34, p<0.001). These results suggest that the hydrological
interaction between the riparian groundwater compartment and the stream channel
is important in elucidating the hydrological responses during drought periods in
small Mediterranean streams.
Keywords: riparian zone, groundwater hydrology, runoff, intermittent stream,
Mediterranean climate |
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