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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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:
Journal Article
Journal or Publication Title:
Advances in Water Resources
Additional Information:
Global sensitivity analysis; Flood modelling; Uncertainty; Inundation model; Decision support; Flood risk
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Deposited On:
19 Oct 2009 15:55
Last Modified:
21 Nov 2022 19:31