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Méthode de consolidation des courbes de tarage pour les crues d'occurrence rare sur le bassin versant expérimental du Real Collobrier

Abstract : This paper presents an overview of the different tools used to extend the rating curve to rare floods on the Réal‑Collobrier located in Pierrefeu‑du‑Var, Southern France. From the 10th to the 14th of November 2011, this catchment was affected by a flood that lasted more than 5 days. The highest water level recorded during this event (4.3 m) exceeded by 2 meters the area of validity of the current rating curve. Two approaches are presented. The first methodology relies on a field survey to calibrate a hydraulic model and determine the priors on water flows. The Bayesian method BaRatin led to estimate a rating curve and its uncertainty interval using the river gauging measurements and the modeled water flows derived from the hydraulic model. The second approach relies on the hydrologic modeling of the watershed. The semi‑distributed conceptual model GR3H was forced by catchment rainfall, which were estimated from rain gauges measurements, to produce the hourly flood hydrograph. The results show that both approaches are consistent regarding flood volume and hydrograph shape but aren't on maximum hourly mean discharge. To conclude, we provide an estimation of the return period of this event based on the Shyreg‑discharge methodology.
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Submitted on : Friday, March 6, 2015 - 8:57:30 AM
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M. Tolsa, Y. Aubert, J. Le Coz, Benjamin Renard, P. Arnaud, et al.. Méthode de consolidation des courbes de tarage pour les crues d'occurrence rare sur le bassin versant expérimental du Real Collobrier. La Houille Blanche - Revue internationale de l'eau, EDP Sciences, 2013, 6, pp.16-23. ⟨10.1051/lhb/2013045⟩. ⟨hal-01123868⟩

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