Calibration and Reliability in Groundwater
Modelling: Credibility of Modelling
(Proceedings of ModelCARE 2007 Conference, held in
Denmark, September 2007). IAHS Publ. 320, 2008, 131-136.
Using stable isotope
data to characterise flow systems in the Pannonian Basin, Hungary
T. SZOCS, GY. TOTH & I. HORVATH
Geological Institute of Hungary, Stefania ut 14, H-1143 Budapest, Hungary
Abstract To
characterise the flow systems, a finite-difference flow and transport model
(Visual MODFLOW) was used. The flow systems, the path lines with their travel
times, and the water budget were modelled. For the 25 000 years-long transport
simulation, a natural tracer, δ18O, was used. The transposition
of δ18O data of the GISP2 ice core made it possible to
reconstruct the palaeorecharge conditions and to calibrate the transport model.
The groundwater of the main drinking water aquifer was recharged mainly during
the Pleistocene. Since the majority of groundwater bodies in Hungary have
similar geological-hydrogeological characteristics as the studied one, this
model helps to solve the tasks (river basin management) related to the objectives
of the Water Framework Directive.
Key words stable isotope; flow system; aquifer; Pannonian Basin; ice core