Work performed and publications: The project has made progress on the three first work packages. Work packages 1 and 2 have advanced as planned. In WP2, we have benefitted from the experimental expertise of Laure Guerit to start some – not initially planned- experiments aiming at better understanding the role of fractures on grain size production, which represents one of the scientific challenges developed in the proposal. We have published a paper on the impact of sediment flux on river erosion and geometry (Baynes et al., 2020) and we are currently writing a paper on a new automatic approach to measure grain size from 3D data (Steer, Guerit et al., in prep.). We have also developed a new physical model to simulate the sediment transport and deposition of a multi-grain-size sediment population (Le Minor et al., in review) . In WP1, we have made some significant progress towards finding an optimal framework to model landslides and their triggering in landscape evolution models. This model was successfully tested against the first Lidar dataset of topographic changes induced by co-seismic landsliding, obtained in the Kaikoura region in New-Zealand (Bernard et al., 2021). We have published a paper on the impact of earthquakes on river profiles (Steer et al., 2019), one paper on landslide modelling in landscape evolution model (Campforts et al., 2020) and one paper where we use pre- and post-earthquake Lidar data in New Zealand to measure in 3D the topographic impact of co-seismic landslides (Bernard et al., 2021). We have also submitted a paper (Pelascini et al., in review) on the impact of atmospheric pressure change and rainfall on landslide triggering, that we are now applying to the numerous landslides triggered by the 2009 Morakot typhoon in Taiwan. In WP3, we have developed new statistical models to efficiently simulate landscape dynamics, including landslides and knickpoints, through several seismic cycles. We have also developed a new numerical model to efficiently simulate river hydrodynamics in landscape evolution models (Steer et al., in prep.).
Dissemination: Our results have been presented and discussed regularly in scientific conferences (e.g. EGU, AGU) and in media outlets. In particular, Philippe Steer has been a keynote speaker for the 2021 Steepest descent meeting, and he has contributed to a documentary on major catastrophic events that will be played on French TV in 2022. Philippe Steer has also initiated a new online series of weekly seminars, entitled "Landscapes Live", that is now co-organized by a team of 8 academics. Landscapes Live is dedicated to Geomorphological study and is freely open to anyone worldwide.
