Factors controlling bed and bank erosion in the Illgraben (CH)

Debris flows can grow greatly in size and hazardous potential by eroding bed bank materials. However, erosion mechanisms are poorly understood because debris complex hybrids between a fluid flow moving mass of colliding particles, erodibility varies events, field measurements hard to obtain. Here, we (i) quantify the spatio-temporal patterns deposition (ii) identify key controls on debris-flow Illgraben (CH). We use dataset that combines information properties, antecedent rainfall, for 13 occurred 2019 2021. show natural torrents be highly variable dynamic, memory effect where is strong at locations during previous vice versa. find conditions rainfall (affecting wetness) jointly control erosion. statistically significant correlations channel erosion/deposition wide range conditions, including frontal depth, velocity, discharge, volume, cumulative shear stress seismic energy, as well rainfall. Overall, describing forces exerted an event, such best explain A shear-stress approach accounting may therefore applicable modelling predicting This work provide input model development identifying with models should oblige.