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Modeling of Groundwater Flow at Wellenberg Using Monte Carlo Simulations

Published online by Cambridge University Press:  10 February 2011

O. Jaquet ,
M. Schindler ,
O. Voborny  and
P. Vinard
O. Jaquet
Affiliation:
Colenco Power Engineering Ltd., CH-5405 Baden
M. Schindler
Affiliation:
Colenco Power Engineering Ltd., CH-5405 Baden
O. Voborny
Affiliation:
Colenco Power Engineering Ltd., CH-5405 Baden
P. Vinard
Affiliation:
Nagra, Swiss National Cooperative for the Disposal of Radioactive Wastes, CH-5430 Wettingen
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Abstract

Wellenberg is the proposed candidate site for LLW/ILW repository in Switzerland (Figure 1). The performance assessment of the planned repository calls for a thorough hydrogeological characterization of the site. The spatial distribution of the hydraulic conductivity within the host rock is a key input for the evaluation of the host rock performances. The spatially variable conductivity field is modelled geostatistically in 3 dimensions using a conditional simulation method. In order to account for the possible range of spatial variability, several simulations of the conductivity are generated. The conditional simulation of the conductivity - representing possible versions of the unknown reality - are used as input for numerical modelling. For each simulated conductivity field, the groundwater flow is numerically modelled using finite elements. This Monte Carlo approach allows the propagation of the input uncertainty due to spatial variability of the conductivity onto the predictions delivered by the flow model. With the help of this approach several specified performance criteria - together with their uncertainty - were estimated for the evaluation of storage capabilities of the Wellenberg host rock.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 865
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

Buxton, B.E. (1989) Geostatistical, Sensitivity, and Uncertainty Methods for Ground-Water Flow and Radionuclide Transport Modeling, Conference Proceedings of DOE and AECL, San Francisco, Battelle Press, pp. 1–670 Google Scholar
Chilés, J.P. (1977) Géostatistique des phénoménes non stationnaires (dans le plan), Doctoral thesis, University of Nancy I, Nancy, pp. 1–130 Google Scholar
Houlding, W.H. (1994) 3-D Geosciences Modeling, Computer Techniques for Geological Characterisation, Springer-Verlag, Berlin, pp.1–309 Google Scholar
Jaquet, O., Lanyon, G.W., Marschall, P. & Tauzin, E. (1997) The Wellenberg K-model - A geostatistical model of the host rock hydraulic conductivity, Nagra Internal Report, Wettingen, Switzerland Google Scholar
Lantuéjoul, Ch. (1994) Non conditional simulation of stationary isotropic multigaussian randomfunctions, Armstrong, and Dowd, (eds.), Geostatistical Simulations, Kluwer Academic Publisher, Dordrecht, pp. 147–177 Google Scholar
Marshall, P., Vomvoris, S., Jaquet, O., Lanyon, B. & Vinard, P. (1997) The Wellenberg K-model: a geostatistical description of hydraulic conductivity distribution of the host rock for site characterization and performance assessment purposes, Proceedings of the 21 st International Symposium on the Scientific Basis of Nuclear Waste Management (this issue).Google Scholar
Matheron, G. (1973) The intrinsic random functions and their applications, Advances in Applied Probability, 5, pp. 439–468 Google Scholar
Nagra (1997) Schlussbericht zu den geologischen Oberflachenuntersuchungen am Wellenberg, Nagra Technical report, NTB 96–01, Wettingen, Switzerland, (in press)Google Scholar
Jackson, C.P., Porter, J.D., Morris, S.T. & Herbert, A.W. (1991) The Implications of Heterogeneity for Repository Performance Assessments, Proceedings of an NEA Workshop, Paris, Heterogeneity of Groundwater Flow and Site Evaluation, OECD, pp.71–82 Google Scholar
Peck, A., Gorelick, S., Marsily de, G., Foster, S. & Kovalevsky, V. (1988) Consequences of Spatial Variability in Aquifer Properties and Data Limitations for Groundwater Modeling Practice, International Association of Hydrological Sciences, Publication No. 175, pp. 1–272 Google Scholar
Voborny, O., Schindler, M., Jaquet, O., & Vinard, P. (1997) Regionalmodell WLB R97-I: Simulation der grossraumigen Grundwasserstr6mungen basierend auf geostatistischer Modellierung des Wirtgesteins. Nagra Internal Report 96-71, Wettingen, Switzerland Google Scholar
Vinard, P., Vomvoris, S., & Marschall, P. (1997) A Comprehensive Hydrodynamic Modelling Approach for the Hydrogeological Site Characterisation and for Deriving Input to Performance Assessment, Proceedings of the 21 st International Symposium on the Scientific Basis of Nuclear Waste Management (in press).Google Scholar