Author(s): M. Abily; G. Antoine; O. Delestre; L. Girolami; N. Goutal; F. Taccone

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Keywords: Debris flow; Rainfall runoff; Shallow water model; TELEMAC-2D

Abstract: This study aims to model hydraulic transfers and erosion sources in steep mountain watersheds using a physically-based hydraulic model. Immature debris flows and shallow landslides are significant sediment sources in such environments. These phenomena are here simulated thanks to a gravity-driven erosion model and a 1D vertical infiltration model integrated into TELEMAC-2D numerical code. The new erosion model employs a fully dynamic system and Coulomb-like bottom friction to better represent debris flow properties. Evaluation against field data (on the Laval catchment, Southern French Alps) demonstrates the ability to reproduce the hydrological response of the basin and also the realistic erosion and deposition patterns.

DOI: https://doi.org/10.3850/iahr-hic2483430201-81

Year: 2024