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| Titel |
Reducing the ambiguity of karst aquifer models by pattern matching of flow and transport on catchment scale |
| VerfasserIn |
S. Oehlmann, T. Geyer, T. Licha, M. Sauter |
| 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 ; 19, no. 2 ; Nr. 19, no. 2 (2015-02-12), S.893-912 |
| Datensatznummer |
250120629
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| Publikation (Nr.) |
 copernicus.org/hess-19-893-2015.pdf |
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| Zusammenfassung |
Assessing the hydraulic parameters of karst aquifers is a challenge due to
their high degree of heterogeneity. The unknown parameter field generally
leads to a high ambiguity for flow and transport calibration in numerical
models of karst aquifers. In this study, a distributed numerical model was
built for the simulation of groundwater flow and solute transport in a
highly heterogeneous karst aquifer in south-western Germany. Therefore, an
interface for the simulation of solute transport in one-dimensional pipes
was implemented into the software COMSOL Multiphysics® and
coupled to the three-dimensional solute transport interface for continuum
domains. For reducing model ambiguity, the simulation was matched for
steady-state conditions to the hydraulic head distribution in the model
area, the spring discharge of several springs and the transport velocities
of two tracer tests. Furthermore, other measured parameters such as the
hydraulic conductivity of the fissured matrix and the maximal karst conduit
volume were available for model calibration. Parameter studies were
performed for several karst conduit geometries to analyse the influence of
the respective geometric and hydraulic parameters and develop a calibration
approach in a large-scale heterogeneous karst system.
Results show that it is possible not only to derive a consistent flow and
transport model for a 150 km2 karst area but also to combine the use
of groundwater flow and transport parameters thereby greatly reducing model
ambiguity. The approach provides basic information about the conduit network
not accessible for direct geometric measurements. The conduit network volume
for the main karst spring in the study area could be narrowed down to
approximately 100 000 m3. |
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