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Flood frequency analysis on the Ardèche river using French documentary sources from the last two centuries.

Naulet, Robin; Lang, Michel; Ouarda, Taha B. M. J.; Coeur, Denis; Bobée, Bernard; Recking, Alain; Moussay, David (2005). Flood frequency analysis on the Ardèche river using French documentary sources from the last two centuries. Journal of Hydrology , vol. 313 , nº 1-2. p. 58-78. DOI: 10.1016/j.jhydrol.2005.02.011.

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Résumé

Fitting statistical laws from a short time series does not give any guarantee of reliability on extreme flood estimation. Historical investigation through documentary sources can enlarge the record period. This paper presents a case study on the Ardèche river, based on collaboration between historians, archivists, hydraulic engineers and hydrologists for a better assessment of the flood risk. A list of historical flood levels from 1644 to the present has been drawn up and converted into discharge using hydraulic modelling. A sensitivity analysis provides error intervals on discharge estimates taking into account uncertainties on water level, roughness coefficient and channel geometry, and the impact of a nonpermanent discharge or the backward effect. A flood frequency analysis using systematic and nonsystematic data gives a practical example on how historical information can improve flood knowledge. It reduces the sampling uncertainty and shows also a good agreement with a hydrometeorological approach (Gradex model).

Type de document: Article
Mots-clés libres: flood frequency analysis; historical information; Ardèche river; Gradex; discharge estimate; error analysis
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 20:34
Dernière modification: 08 janv. 2021 20:34
URI: http://espace.inrs.ca/id/eprint/10990

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