Evaluating uncertainties of future marine flooding occurrence as sea-level rises

Gonéri Le Cozannet (1) , Jeremy Rohmer (1) , Anny Cazenave (2) , Déborah Idier (1) , Roderik van de Wal , Renske de Winter , Rodrigo Pedreros (1) , Yann Balouin (1) , Charlotte Vinchon (1) , Carlos Oliveros (1)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales

As sea-level rises, the frequency of coastal marine flooding events is changing. For accurate assessments, several other factors must be considered as well, such as the variability of sea-level rise and storm surge patterns. Here, a global sensitivity analysis is used to provide quantitative insight into the relative importance of contributing uncertainties over the coming decades. The method is applied on an urban low-lying coastal site located in the northwestern Mediterranean, where the yearly probability of damaging flooding could grow drastically after 2050. Storm surge propagation processes, then sea-level variability, and, later, global sea-level rise scenarios become successively important source of uncertainties over the 21st century. This defines research priorities that depend on the target period of interest. On the long term, scenarios RCP 6.0 and 8.0 challenge local capacities of adaptation for the considered site.

Domains: Sciences of the Universe [physics]; Earth Sciences

Gonéri Le Cozannet, Jeremy Rohmer, Anny Cazenave, Déborah Idier, Roderik van de Wal, et al.. Evaluating uncertainties of future marine flooding occurrence as sea-level rises. Workshop Global and Regional Sea Level variability and change, University of the Balearic Islands Palma de Mallorca, Spain, Jun 2015, Palma de Mallorca, Spain. ⟨hal-01118683⟩