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| Titel |
The hydrological response of baseflow in fractured mountain areas |
| VerfasserIn |
A. Millares, M. J. Polo, M. A. Losada |
| 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 ; 13, no. 7 ; Nr. 13, no. 7 (2009-07-21), S.1261-1271 |
| Datensatznummer |
250011944
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| Publikation (Nr.) |
 copernicus.org/hess-13-1261-2009.pdf |
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| Zusammenfassung |
| The study of baseflow in mountainous areas of basin headwaters, where the
characteristics of the often fractured materials are very different to the
standard issues concerning porous material applied in conventional
hydrogeology, is an essential element in the characterization and
quantification of water system resources. Their analysis through recession
fragments provides information on the type of response of the sub-surface
and subterranean systems and on the average relation between the storage and
discharge of aquifers, starting from the joining of these fragments into a
single curve, the Master Recession Curve (MRC). This paper presents the
generation of the downward MRC over fragments selected after a preliminary
analysis of the recession curves, using a hydrological model as the
methodology for the identification and the characterization of quick
sub-surface flows flowing through fractured materials. The hydrological
calculation has identified recession fragments through surface runoff or
snowmelt and those periods of intense evapotranspiration. The proposed
methodology has been applied to three sub-basins belonging to a high
altitude mountain basin in the Mediterranean area, with snow present every
year, and their results were compared with those for the upward
concatenation of the recession fragments. The results show the existence of
two different responses, one quick (at the sub-surface, through the
fractured material) and the other slow, with linear behaviour which takes
place in periods of 10 and 17 days respectively and which is linked to the
dimensions of the sub-basin. In addition, recesses belonging to the dry
season have been selected in order to compare and validate the results
corresponding to the study of recession fragments. The comparison, using
these two methodologies, which differ in the time period selected, has
allowed us to validate the results obtained for the slow flow. |
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