Flash floods (FF) events are difficult to forecast because of their small temporal and spatial scale. Furthermore, they often occur on un-monitored small rivers, where no real-time data is available to warn people. To better anticipate these events and mitigate their impacts, the French Ministry in charge of Ecology has launched a national FF warning system: Vigicrues Flash. This system takes real-time radar-gauge rainfall products at a 1-km² resolution from Météo-France and issues automatic flood warnings based on the Adaptation d’Information Géographique pour l’Alerte en Crue (AIGA) method at small un-gauged catchments (greater than 10-km²). AIGA aims to characterize flood hazard at any point along the river network by comparing discharges in real-time produced by a simplified distributed rainfall-runoff model (GRD) to reference flood quantiles obtained using the same model and a continuous radar-gauge rainfall re-analysis. Vigicrues Flash was launched in March 2017. The aim of this paper is to briefly present the new system and a first analysis of its performance during one exceptional large event that occurred in June 2018.
This paper is a contribution to the 2019 edition of the Global Assessment Report on Disaster Risk Reduction (GAR 2019).
To cite this paper:
Javelle, P. et al.. Flash flood warnings: Recent achievements in France with the national Vigicrues Flash system. Contributing Paper to GAR 2019