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| Titel |
Simulation of saturated and unsaturated flow in karst systems at catchment scale using a double continuum approach |
| VerfasserIn |
J. Kordilla, M. Sauter, T. Reimann, T. Geyer |
| 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 ; 16, no. 10 ; Nr. 16, no. 10 (2012-10-30), S.3909-3923 |
| Datensatznummer |
250013536
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| Publikation (Nr.) |
 copernicus.org/hess-16-3909-2012.pdf |
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| Zusammenfassung |
| The objective of this work is the simulation of saturated and unsaturated
flow in a karstified aquifer using a double continuum approach. The
HydroGeoSphere code (Therrien et al., 2006) is employed to simulate spring
discharge with the Richards equations and van Genuchten parameters to
represent flow in the (1) fractured matrix and (2) conduit continuum coupled
by a linear exchange term. Rapid vertical small-scale flow processes in the
unsaturated conduit continuum are accounted for by applying recharge boundary
conditions at the bottom of the saturated model domain. An extensive
sensitivity analysis is performed on single parameters as well as parameter
combinations. The transient hydraulic response of the karst spring is
strongly controlled by the matrix porosity as well as the van Genuchten
parameters of the unsaturated matrix, which determine the head dependent
inter-continuum water transfer when the conduits are draining the matrix.
Sensitivities of parameter combinations partially reveal a non-linear
dependence over the parameter space. This can be observed for parameters not
belonging to the same continuum as well as combinations, which involve the
exchange parameter, showing that results of the double continuum model may
depict a certain degree of ambiguity. The application of van Genuchten
parameters for simulation of unsaturated flow in karst systems
is critically
discussed. |
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