INTRAVAL phase 2: Investigations of the influence of density stratification on flow behaviour, giving as an example the 'White Moor' pumping test

Investigations of the influence of density stratification on flow behaviour, giving as an example the 'White Moor' pumping test. The present paper sums up the work done by the Bundesamt fuer Strahlenschutz on the INternational TRAnsport Code VALidations Study (INTRAVAL), test case Gorleben, as it was presented also at the meeting of the INTRAVAL Salt-Working-Group at Santa Fe in October 1991 and at Traben-Trarbach in June 1992, and at the 2nd INTRAVAL Phase-2-Workshop in Sydney in February 1992. On the one hand it serves to inform interested parties about the activities developed by the BfS, and on the other hand it is supposed to be the basis for reporting, above working group level and summing up their results, by the INTRAVAL Salt-Working-Group. A short description of the pumping test is followed by a report on how the aquifer parameters permeability k, storage coefficient S, and aquifer thickness b were determined on the basis of the analytical THEIS solution to calculate the drawdown funnel of a well. Based on this, the numerical calculations by the computer programs SUTRA and ROCKFLOW are described. The conclusions drawn are summarized. (orig./BBR)