TY - JOUR
T1 - Multi-method global sensitivity analysis of flood inundation models
AU - Pappenberger, Florian
AU - Beven, Keith J.
AU - Ratto, Marco
AU - Matgen, Patrick
PY - 2008/1/1
Y1 - 2008/1/1
N2 - 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.
AB - 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.
KW - Decision support
KW - Flood modelling
KW - Flood risk
KW - Global sensitivity analysis
KW - Inundation model
KW - Uncertainty
UR - http://www.scopus.com/inward/record.url?scp=36049007132&partnerID=8YFLogxK
U2 - 10.1016/j.advwatres.2007.04.009
DO - 10.1016/j.advwatres.2007.04.009
M3 - Article (Academic Journal)
AN - SCOPUS:36049007132
SN - 0309-1708
VL - 31
SP - 1
EP - 14
JO - Advances in Water Resources
JF - Advances in Water Resources
IS - 1
ER -