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A Comprehensive Hydrodynamic Modeling Approach for the Hydrogeological Site Characterization and for Deriving Input to Performance Assessment

Published online by Cambridge University Press:  10 February 2011

P. Vinard ,
S. Vomvoris  and
P. Marschall
P. Vinard
Affiliation:
Nagra, Swiss National Cooperative for the Disposal of Radioactive Waste, Hardstrasse 73, CH-5430 Wettingen, Switzerland, vinard@nagra.ch
S. Vomvoris
Affiliation:
Nagra, Swiss National Cooperative for the Disposal of Radioactive Waste, Hardstrasse 73, CH-5430 Wettingen, Switzerland
P. Marschall
Affiliation:
Nagra, Swiss National Cooperative for the Disposal of Radioactive Waste, Hardstrasse 73, CH-5430 Wettingen, Switzerland
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Abstract

This paper gives an overview of the numerical models employed for the simulation of ground-water flow at the Wellenberg site, the runs carried out and the kind of products which were specified as results of the modelling calculations. With respect to more conventional modelling approaches, based mainly on fully deterministic and steady-state schemes, this new approach integrates both deterministic and stochastic aspects (hydraulic conductivity distribution, geometry of the fracture network, etc.) in three different groundwater models, accounting for different scale levels. Moreover, this new approach is as close as possible to a realistic representation of the in situ conditions, since it is based on plausible distributions of transmissivity and hydraulic conductivity at all scales and takes the transient nature of flow fully into account. This latter aspect is fundamental since, at Wellenberg, both the underground facilities and a natural head anomaly in the host rock cause pressure disturbance in the flow field. Finally, and because boundary conditions (especially topographic surface and overburden) vary over time, model predictions based on current topography and climatic conditions are of limited duration and hence a validity duration has to be defined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 857
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

1 Vinard, P., Bltimling, P., McCord, J.P., Aristorenas, G. (1993): Evaluation of hydraulic underpressures at Wellenberg. Switzerland. Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. Vol. 30, No. 7, pp. 1143–1150.Google Scholar
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3 Marschall, P., Vomvoris, S., Jaquet, O., Lanyon, B., Vinard, P. (1997): The Wellenberg K-Model: A geostatistical description of hydraulic conductivity distribution in the host rock for site characterization and performance assessment purposes. Proceedings of the 21st International Symposium on the Scientific Basis of Nuclear Waste Management (in press.).Google Scholar
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5 Jaquet, O., Schindler, M., Voborny, O., Vinard, P. (1997): Modelling of groundwater flow at the Wellenberg Site using Monte Carlo simulations. Proceedings of the 21st International Symposium on the Scientific Basis of Nuclear Waste Management.Google Scholar