TY  - JOUR
A1  - Oehlmann, S.
A1  - Geyer, T.
A1  - Licha, T.
A1  - Birk, S.
T1  - Influence of aquifer heterogeneity on karst hydraulics and catchment delineation employing distributive modeling approaches
Y1  - 2013
VL  - 17
IS  - 12
SP  - 4729
EP  - 4742
JF  - Hydrology and Earth System Sciences
DO  - 10.5194/hess-17-4729-2013
DO  - 10.23689/fidgeo-2494
N2  - 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.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6807
ER  -