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• W2794272012 abstract "In this paper, we develop a surrogate modelling approach for capturing the output field (e.g. the pressure head) from groundwater flow models involving a stochastic input field (e.g. the hydraulic conductivity). We use a Karhunen–Loève expansion for a log-normally distributed input field and apply manifold learning (local tangent space alignment) to perform Gaussian process Bayesian inference using Hamiltonian Monte Carlo in an abstract feature space, yielding outputs for arbitrary unseen inputs. We also develop a framework for forward uncertainty quantification in such problems, including analytical approximations of the mean of the marginalized distribution (with respect to the inputs). To sample from the distribution, we present Monte Carlo approach. Two examples are presented to demonstrate the accuracy of our approach: a Darcy flow model with contaminant transport in 2-d and a Richards equation model in 3-d." @default.
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• W2794272012 date "2018-05-25" @default.
• W2794272012 modified "2023-10-16" @default.
• W2794272012 title "A Surrogate Modelling Approach Based on Nonlinear Dimension Reduction for Uncertainty Quantification in Groundwater Flow Models" @default.
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• W2794272012 doi "https://doi.org/10.1007/s11242-018-1065-7" @default.
• W2794272012 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6390720" @default.
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