Towards a better understanding of debris flow sediment sources: Monitoring of an active rock slope at Spitze Stei, SwitzerlandMałgorzata Chmiel, Lena Husmann, Fabian Walter, Huw Horgan, Giacomo Belli, Emanuele Marchetti and Christian KienholzE3S Web of Conf., 415 (2023) 03006DOI: https://doi.org/10.1051/e3sconf/202341503006