L’analyse de sensibilité globale peine à se développer dans le champ de la modélisation environnementale. Dans sa formulation initiale, elle est limitée à l’étude de modèles
Variance-based Sobol’ global sensitivity analysis (GSA) was initially designed for the study of models with scalar inputs and outputs, while many models in the environmental field are spatially explicit. As a result, GSA is not a common practise in environmental modelling. In this paper we describe a detailed case study where GSA is performed on a spatially dependent model for flood risk economic assessment on the Orb valley (southeast France). Spatial input factors are handled by associating randomly generated map realizations to scalar values sampled from discrete uniform distributions. The realisations of random input maps can be generated by any method including geostatistical simulation techniques, allowing for spatial structure and auto-correlation to be taken into account. The estimation of sensitivity indices on ACB-DE spatial outputs makes it possible to produce maps of sensitivity indices. These maps describe the spatial variability of Sobol’ indices. Sensitivity maps of different resolutions are then compared to discuss the relative influence of uncertain input factors at different scales.
Keywords: sensitivity, variance-based, Sobol, spatial, flood
@article{JSFS_2011__152_1_49_0, author = {Saint-Geours, Nathalie and Lavergne, Christian and Bailly, Jean-St\'ephane and Grelot, Fr\'ed\'eric}, title = {Analyse de sensibilit\'e globale d{\textquoteright}un mod\`ele spatialis\'e pour l{\textquoteright}\'evaluation \'economique du risque d{\textquoteright}inondation}, journal = {Journal de la soci\'et\'e fran\c{c}aise de statistique}, pages = {49--71}, publisher = {Soci\'et\'e fran\c{c}aise de statistique}, volume = {152}, number = {1}, year = {2011}, zbl = {1316.62176}, language = {fr}, url = {https://numdam.org/item/JSFS_2011__152_1_49_0/} }
TY - JOUR AU - Saint-Geours, Nathalie AU - Lavergne, Christian AU - Bailly, Jean-Stéphane AU - Grelot, Frédéric TI - Analyse de sensibilité globale d’un modèle spatialisé pour l’évaluation économique du risque d’inondation JO - Journal de la société française de statistique PY - 2011 SP - 49 EP - 71 VL - 152 IS - 1 PB - Société française de statistique UR - https://numdam.org/item/JSFS_2011__152_1_49_0/ LA - fr ID - JSFS_2011__152_1_49_0 ER -
%0 Journal Article %A Saint-Geours, Nathalie %A Lavergne, Christian %A Bailly, Jean-Stéphane %A Grelot, Frédéric %T Analyse de sensibilité globale d’un modèle spatialisé pour l’évaluation économique du risque d’inondation %J Journal de la société française de statistique %D 2011 %P 49-71 %V 152 %N 1 %I Société française de statistique %U https://numdam.org/item/JSFS_2011__152_1_49_0/ %G fr %F JSFS_2011__152_1_49_0
Saint-Geours, Nathalie; Lavergne, Christian; Bailly, Jean-Stéphane; Grelot, Frédéric. Analyse de sensibilité globale d’un modèle spatialisé pour l’évaluation économique du risque d’inondation. Journal de la société française de statistique, Tome 152 (2011) no. 1, pp. 49-71. https://numdam.org/item/JSFS_2011__152_1_49_0/
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