A feasibility study has been completed with the aim to evaluate the possibility of application of a ground-water simulation model for regional hydrogeological investigation in the southern Vienna basin in Lower Austria. The specific hydrogeological structure targeted is the graben called the Mitterndorfer Senke.
Mitterndorfer Senke is an elongate northeast-southwest trending quaternary-tertiary inter montaine basin of 50 km length and width varying between 2 to 10 km with a depth of quaternary deposits of 20 to 150 m. According to previous geohydrological studies, the quaternary aquifer which is composed mainly of gravels and sands is assumed to be isolated from the tertiary marls, clays, and fine sands although ascendant ground-water leakage from tertiary as well as horizontal ground-water communication will have to be checked. A ground-water modeling study is being prepared to: (1) simulate ground-water flow to evaluate influence of pumping from various wells on aquifer exploitation; and (2) simulate solute transport to evaluate ground-water polychlorinated biphenyl (PCB) contamination caused by various industrial facilities and waste disposal sites in the area.
The geographic information system (GIS) has been applied to represent and compare data transferred from databases of various institutions as well as collected during the extensive literature search. Information and data distribution of the following basic thematic groups have been evaluated and visualized: topography; geology, stratigraphy, and tectonics; hydrogeology; and surface hydrology.
GIS has been used not only for data visualization but also for comparison of compiled data from various sources and volumetric computations.
Currently, an interface between GIS and a complex three-dimensional finite-element ground water model is being developed. In the following stages of the Mitterndorfer Senke study, GIS will continue to serve as a useful tool for data pre- and post-processing.