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| Titel |
Quantifying and modelling the contribution of streams that recharge the Querença-Silves aquifer in the south of Portugal |
| VerfasserIn |
N. Salvador, J. P. Monteiro, R. Hugman, T. Y. Stigter, E. Reis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 11 ; Nr. 12, no. 11 (2012-11-06), S.3217-3227 |
| Datensatznummer |
250011183
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| Publikation (Nr.) |
 copernicus.org/nhess-12-3217-2012.pdf |
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| Zusammenfassung |
| The water balance of the mesocenozoic aquifers of the Algarve, in the south
of Portugal has traditionally been estimated considering only direct
("autogenic") recharge from rainfall occurring in the area of the
aquifers. Little importance has been attributed to so-called allogenic
recharge, originating from streambed infiltration from runoff generated
outside the aquifers, particularly in the Palaeozoic rocks to the north
where runoff is high. The Querença-Silves (QS) aquifer is the most
important aquifer of the region both for irrigation and public water supply.
Several important and sensitive surface/groundwater ecotones and associated
groundwater dependent ecosystems exist at the springs of the natural
discharge areas of the aquifer system. A numerical flow model has been in
constant development over the last few years and currently is able to
reproduce the aquifer's responses to estimated direct recharge and
abstraction for the years 2001–2010. However, recharge calculations for the
model do not take into account allogenic recharge infiltration along
influent reaches of streams. The quantification of allogenic recharge may
further improve the assessment of water availability and exploitation risks.
In this paper an attempt is made to quantify the average annual contribution
of allogenic recharge to the QS aquifer, based on monitoring data of the
principal water courses that cross the aquifer system. Significant
uncertainties related to surface runoff generated within the aquifer area,
as well as areal recharge were identified and the consequences for the
optimization of spatial distribution of transmissivity in the groundwater
flow model are also addressed. |
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