White paper essays on model validation Task 10 of SKB Task Force GWFTS -Validation approaches for groundwater flow and transport modelling with discrete features
Résumé
Safety assessments of radioactive waste repositories rely heavily on results obtained by numerical models that assess the long-term performance of the engineered and natural barrier systems. Given that important engineering and public policy decisions are based on these models, it is essential that we critically evaluate their abilities and limitations, and thus justify the level of confidence we have in the inferences drawn from the modelling. In this report, the authors discuss some of the issues that should be considered in the modeler's attempts to test, corroborate, confirm, and verify numerical models. This process is here referred to as model validation and a pragmatic approach is chosen for this important topic. This report presents a series of essays concerning the pragmatic validation of numerical models of flow and solute transport in fractured crystalline rock. The different essays were contributed by members of a "White Paper Group" formed within Task 10 of the SKB Task Force on Modelling of Groundwater Flow and Transport of Solutes (GWFTS) to consider how to approach the issue of pragmatic model validation.
The basis of a proposed approach is summarised in Chapter 5. The ideas described are intended to provide a basis for discussion within the Task Force GWFTS and for the further development of pragmatic approaches to model validation.
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