Efficient posterior exploration of a high-dimensional groundwater model from two-stage Markov chain Monte Carlo simulation and polynomial chaos expansion

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Abstract

This study reports on two strategies for accelerating posterior inference of a highly parameterized and CPU-demanding groundwater flow model. Our method builds on previous stochastic collocation approaches, e.g., Marzouk and Xiu (2009) and Marzouk and Najm (2009), and uses generalized polynomial chaos (gPC) theory and dimensionality reduction to emulate the output of a large-scale groundwater flow model. The resulting surrogate model is CPU efficient and serves to explore the posterior distribution at a much lower computational cost using two-stage MCMC simulation. The case study reported in this paper demonstrates a two to five times speed-up in sampling efficiency.

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Original languageEnglish
Pages (from-to)2664-2682
JournalWater Resources Research
Volume49
Issue number5
DOIs
StatePublished - May 2013

Keywords

  • stochastic inversion, high parameter dimensionality, groundwater modeling, two-stage Markov chain Monte Carlo, polynomial chaos expansion, dimensionality reduction

ID: 305249