La connectivité sédimentaire dans la haute chaîne pyrénéenne par l’analyse de la crue de juin 2013 : le rôle des formations superficielles

Abstract

La connectivité sédimentaire dans la haute chaîne pyrénéenne par l'analyse de la crue de juin 2013 : le rôle des formations superficielles Sediment connectivity in the high Pyrenees mountain range by 2013 flood analysis: role of surficial sediment storages

Channel change during catastrophic flood: Example of Storm Alex in the Vésubie and Roya valleys

“…Hillslope-channel coupling controls the efficiency with which energy is transmitted through the fluvial system, explaining why sediment connectivity of upland catchments is recognized as a fundamental factor of their geomorphic sensitivity to disturbances (Brunsden, 2001;Harvey, 2001;Fryirs, 2013). Some recent major flood events in small mountain streams of the French Pyrenees (Blanpied et al, 2018) and Italian Alps (Pellegrini et al, 2021;Scorpio et al, 2022) illustrate how sediment connectivity can be used to reconstruct the sediment cascade associated with extreme events. The initiation and propagation of sediment waves is a classic geomorphic response to extreme floods in upland environments, with active channel widening and aggradation as the typical morphological imprints of the sediment wave (Beschta, 1983;Pitlick, 1993;Madej and Ozaki, 1996;Nelson and Dubé, 2016).…”

Statistical Modelling of Sediment Supply in Torrent Catchments of the Northern French Alps

“…In particular, the index of connectivity (IC) (Borselli et al, 2008;Cavalli et al, 2013) has been widely used in torrential catchment studies (e.g. Micheletti and Lane, 2016;Blanpied et al, 2018;Schopper et al, 2019). Equation based on a sample of 16 events that occurred in Uri region (Switzerland).…”