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Multi-method global sensitivity analysis of flood inundation models.

Pappenberger, Florian and Beven, Keith J. and Ratto, Marco and Matgen, Patrick (2008) Multi-method global sensitivity analysis of flood inundation models. Advances in Water Resources, 31 (1). pp. 1-14.

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Abstract

Global sensitivity analysis is a valuable tool in understanding flood inundation models and deriving decisions on strategies to reduce model uncertainty. In this paper, a sensitivity analysis of a one-dimensional flood inundation model (HEC-RAS) on the River Alzette, Luxembourg, is presented. It is impossible to define sensitivity in a unique way and different methods can lead to a difference in ranking of importance of model factors. In this paper five different methods (Sobol, Kullback–Leibler entropy, Morris, regionalised sensitivity analysis and regression) are applied and the outcomes on selected examples compared. It is demonstrated that the different methods lead to completely different ranking of importance of the parameter factors and that it is impossible to draw firm conclusions about the relative sensitivity of different factors. Moreover, the uncertainty inherent in the sensitivity methods is highlighted.

Item Type: Article
Journal or Publication Title: Advances in Water Resources
Additional Information: Global sensitivity analysis; Flood modelling; Uncertainty; Inundation model; Decision support; Flood risk
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 27350
Deposited By: Mr Richard Ingham
Deposited On: 19 Oct 2009 16:55
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:41
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/27350

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