Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 72, Issue -, Pages 173-183Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2015.07.010
Keywords
Dependent inputs; Rosenblatt transformation; Variance-based sensitivity indices; Dependent contributions; Independent contributions; Iman & Conover sampling procedure; Radionuclide migration
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Funding
- French National Research Agency [ANR-12-BS06-0010-02]
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This paper addresses the issue of performing global sensitivity analysis of model output with dependent inputs. First, we define variance-based sensitivity indices that allow for distinguishing the independent contributions of the inputs to the response variance from their mutual dependent contributions. Then, two sampling strategies are proposed for their non-parametric, numerical estimation. This approach allows us to estimate the sensitivity indices not only for individual inputs but also for groups of inputs. After testing the accuracy of the non-parametric method on some analytical test functions, the approach is employed to assess the importance of dependent inputs on a computer model for the migration of radioactive substances in the geosphere. (C) 2015 Elsevier Ltd. All rights reserved.
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