Influence of aquifer heterogeneity on karst hydraulics and catchment delineation employing distributive modeling approaches
Oehlmann, S.
Geyer, T.
Licha, T.
Birk, S.
17, 12: 4729 - 4742
DOI: https://doi.org/10.5194/hess-17-4729-2013
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6807
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6807
Oehlmann, S.; Geyer, T.; Licha, T.; Birk, S., 2013: Influence of aquifer heterogeneity on karst hydraulics and catchment delineation employing distributive modeling approaches. In: Hydrology and Earth System Sciences, Band 17, 12: 4729 - 4742, DOI: 10.5194/hess-17-4729-2013.
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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 hy-
draulic 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 de-
lineation. 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 use-
ful tool for catchment delineation in karst aquifers based on
results from different field observations.
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- Geologie [931]