Model Comparison Strategies
Sim-SEQ pursues two different strategies for model comparison, as explained below. Together, these strategies provide a unique and convincing strategy for achieving the Sim-SEQ goals of confidence enhancement, uncertainty evaluation, and cooperative research.
Multiple Site Approach (MSA)
One strategy is referred to a MSA, which stands for “Multiple Site Approach.” As part of their field test activities, the different RCSPs have formed modeling groups that conduct predictive modeling as well as work on subsequent model updates for their respective field tests, each with specific hydrogeologic complexities and modeling challenges. By discussing the simulation work and modeling challenges related to these multiple sites in the Sim-SEQ Technical Team meetings, modeling groups are exposed to a range of field characteristics and diverse model challenges. Lessons learned will thus be based on a range of GCS sites covering the range of geologic conditions within the United States.
Multiple Model Approach (MMA)
The Multiple Site Approach does not allow for a direct comparison between multiple modeling groups, since there is typically only one model for each RCSP site. A complementary strategy is therefore pursued simultaneously, referred to as MMA, or “Multiple Model Approach.” One of the large-scale field experiments, preferably one that provides early data and that is reasonably representative in terms of modeling challenges, will be selected as a designated test case for Sim-SEQ model comparison. The different modeling groups established by the partnerships will each develop individual models for this one selected site, based on a single set of site characterization data, but using their respective modeling approaches and simulators. Being able to evaluate different model results for one site in the MMA guarantees a direct comparison of models and approaches, and allows understanding and explaining their differences, stemming, for example, from process simplifications and parameter choices. Selection of the designated site is underway. International modeling teams are welcome to join in this collaborative effort.
