PITON , Guillaume

This paper explores the economic efficiency of flood protection strategies to aid funding decisions of public bodies. The Brague river is a 68 km 2 catchment located on the Mediterranean Sea shore in South East France. It experienced disastrous flash floods triggering costly damages and casualties in the communities of Biot and Antibes. Several...

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Documenting and interpreting channel responses to catastrophic floods help understanding how rapid fluvial metamorphosis can propagate in a catchment under sediment cascading effects. The recent example of the October 2020 Storm Alex in SE France (~ 500 mm of rain in 24 h) provides a unique opportunity to investigate major geomorphic responses...

On October 2nd, 2020, under the combined effect of the winter Alex storm formed off the Brittany coast, and a strong Mediterranean episode, very intensive rainfalls affected in the south eastern France, both Roya and Vésubie catchments (locally up to 600 mm in 24h). This paroxysmal event with a heavy human toll (10 dead, 8 missing) generated...

The Brague River basin (68 km 2 ) is located on the French Mediterranean coast. It experiences a high risk of flash floods. The potential efficacy and efficiency of flood protection strategies based on green (Nature Based Solutions: NBS) or grey (civil-engineering) measures, as well as their co-benefits, are studied in this chapter. Two NBS...

During major floods, rivers erode their banks and thus recruit large wood pieces from the riparian zones. There is still a lack of knowledge about the transport of large wood, the volumes involved and the flux distribution, i.e. the large wood connectivity at catchment scale. During storm Alex (October 2020), the French Roya catchment (394 km2)...

The Brague River basin is a 68 km² catchment located along the French Mediterranean coast between the cities of Cannes and Nice. On 3rd Oct. 2015, the basin was severely hit by an extreme flash flood (time return was over 100 years). The basin very flat lowlands experienced numerous damages and casualties related to this flooding event. The...

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Storm Alex, which hit France between 1 and 2 October 2020, caused an exceptional Mediterranean episode in the southeast of France on October 2 and 3, with unprecedented magnitude debris floods in the Roya and Vésubie valleys, major morphological changes and heavy human and material damages. A technical feedback was carried out at the request of...

Strom Alex -Lessons learned from the debris-floods that occurred on 2 October 2020 in the French South-East Alps ABSTRACT Storm Alex, which hit France between 1 and 2 October 2020, caused an exceptional Mediterranean episode in the southeast of France on October 2 and 3, with unprecedented magnitude debris floods in the Roya and Vésubie...

Evidence are dearly needed to understand under which conditions it is relevant for decisions makers to invest in NBS for water-related risk. This chapter presents the methodological framework developed for the economic assessment of NBS for water-related risks and its application to seven case studies. We particularly develop methods for the...

Economic narratives are largely put forward as an argument for the promotion of Nature Based Solutions (NBS). However, integrated economic evidence, taking into account direct and opportunity costs, avoided damages and the multiplicity of co-benefits generated by NBS are still needed to support this argument and convince decision makers to...

International audience

Ce dataset regroupe le rapport de retour d'expérience et ses annexes. Il a été rédigé par l'ONF-RTM, l'ONF-DRN et INRAE ETNA, appuyés de chercheurs ayant contribué à l'analyse. Il visait à documenter et analyser les crues torrentielles qui ont touché le bassin versant de la Roya pendant la tempête Alex. Ce retour d'expérience technique a été...