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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 et 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: https://espace.inrs.ca/id/eprint/10990

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