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

Abstract : 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 non-permanent discharge or the backward effect. A flood frequency analysis using systematic and non-systematic 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.
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https://hal.inrae.fr/hal-02586764
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Submitted on : Friday, May 15, 2020 - 11:34:54 AM
Last modification on : Saturday, June 25, 2022 - 9:21:17 PM

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R. Naulet, M. Lang, T.B. Ouarda, D. Coeur, B. Bobée, et al.. Flood frequency analysis on the Ardèche river using French documentary sources from the two last centuries. Journal of Hydrology, Elsevier, 2005, 313, pp.58-78. ⟨10.1016/j.jhydrol.2005.02.011⟩. ⟨hal-02586764⟩

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