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Reconstitution des crues extrêmes du Gardon à partir d'une analyse paléohydrologique

Abstract : This paper presents a paleo-hydrological study conducted on sediment flood deposits at two sites located in the Gardon Gorges, Southeast France. The first study site is a valley‑side terrace (referred to as site GE, located 10m above the channel bed) and the second is located in a cave (referred to as site GG, perched 15m above the bed level). Paleo‑flood events were identified by carefully analyzing each slackwater flood deposits. The flood units were then dated using a variety of dating techniques, namely 137Cs, 210Pbex, 14C geochemical analysis of mining‑contaminated slackwater flood sediments, archeological objects and the historic flood record. Hydraulic modeling was also carried out in order to verify the coherence between the stratigraphic records of flood deposits at the sites and the historic flood levels known along the river Gardon. It is demonstrated that all the major flood events of the 20th century can be identified at terrace GE. This type of geomorphological unit can therefore be used as a sound basis for a paleo-hydrological analysis of the Gardon Gorges. Furthermore, the analysis of the stratigraphic record at site GG demonstrates that the site can be used to trace the largest flood events that have occurred within the past 600 years. The study reveals that the frequency of extreme flood events increased during the Little Ice Age
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L. Dezileau, B. Terrier, J.F. Berger, P. Blanchemanche, A. Latapie, et al.. Reconstitution des crues extrêmes du Gardon à partir d'une analyse paléohydrologique. La Houille Blanche - Revue internationale de l'eau, EDP Sciences, 2014, 4, pp.44-52. ⟨10.1051/lhb/2014037⟩. ⟨hal-01108400⟩

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