Articles | Volume 24, issue 9
Hydrol. Earth Syst. Sci., 24, 4567–4574, 2020
https://doi.org/10.5194/hess-24-4567-2020
Hydrol. Earth Syst. Sci., 24, 4567–4574, 2020
https://doi.org/10.5194/hess-24-4567-2020

Technical note 21 Sep 2020

Technical note | 21 Sep 2020

Technical Note: Improved sampling of behavioral subsurface flow model parameters using active subspaces

Daniel Erdal and Olaf A. Cirpka

Data sets

Stochastic engine and active subspace global sensitivity analysis codes Erdal, D. and Cirpka, O. A. http://hdl.handle.net/10900.1/6a66361b-b713-4312-819b-18f82f27aa18

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Short summary
Assessing model sensitivities with ensemble-based methods can be prohibitively expensive when large parts of the plausible parameter space result in model simulations with nonrealistic results. In a previous work, we used the method of active subspaces to create a proxy model with the purpose of filtering out such unrealistic runs at low cost. This work details a notable improvement in the efficiency of the original sampling scheme, without loss of accuracy.