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| Titel |
Influence of aquifer heterogeneity on karst hydraulics and catchment delineation employing distributive modeling approaches |
| VerfasserIn |
S. Oehlmann, T. Geyer, T. Licha, S. Birk |
| 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 ; 17, no. 12 ; Nr. 17, no. 12 (2013-12-03), S.4729-4742 |
| Datensatznummer |
250086009
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| Publikation (Nr.) |
 copernicus.org/hess-17-4729-2013.pdf |
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| Zusammenfassung |
Due to their heterogeneous nature, karst aquifers pose a major challenge for
hydrogeological investigations. Important procedures like the delineation of
catchment areas for springs are hindered by the unknown locations and
hydraulic properties of highly conductive karstic zones.
In this work numerical modeling was employed as a tool in delineating
catchment areas of several springs within a karst area in southwestern
Germany. For this purpose, different distributive modeling approaches were
implemented in the finite element simulation software Comsol
Multiphysics®. The investigation focuses on the question to
which degree the effect of karstification has to be taken into account for
accurately simulating the hydraulic head distribution and the observed
spring discharges.
The results reveal that the representation of heterogeneities has a large
influence on the delineation of the catchment areas. Not only the location
of highly conductive elements but also their geometries play a major role
for the resulting hydraulic head distribution and thus for catchment area
delineation. The size distribution of the karst conduits derived from the
numerical models agrees with knowledge from karst genesis. It was thus shown
that numerical modeling is a useful tool for catchment delineation in karst
aquifers based on results from different field observations. |
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