Field verification of advanced transport models of radionuclides in heterogeneous soils
This report deals with a verification study of advanced transport models of radionuclides in heterogeneous soils. The study is the third phase of a research programme concerning the influence of soil heterogeneities on the migration of radionuclides in the soil and soil-water system. The verification study involves the predictive modelling of a field tracer experiment using conservative (131I, Cl(-), 3H) as well as non-conservative (Co-EDTA) tracers. Several concepts and calculation strategies developed earlier have been verified. Inverse modelling has been applied to evaluate the scale dependence of hydrodynamic dispersion. This shows that micro dispersion may be considered as a soil constant related to grainsize. Micro dispersion shows a slow increase with distance from the source. This increase is caused by mass transfer between adjacent layers of different permeability. The prediction of the migration of radionuclides through heterogeneous soils is possible. Models based on the advection dispersion equation give accurate and comparable results on a small field test scale (3.5 m). However, the accuracy of the prediction strongly depends on the accuracy with which the necessary soil constants are known.
Bibliographic Reference: EUR 13530 EN (1991) 109 pp., FS, ECU 10
ISBN: ISBN 92-826-0588-4
Record Number: 199110738 / Last updated on: 1994-12-02
Original language: en
Available languages: en