A multi-year record of topographic changes on debris-flow fans in south-western British Columbia, CanadaAndrew Mitchell, Sophia Zubrycky, Eimile McSorley, Scott McDougall and Mitch D’ArcyE3S Web of Conf., 415 (2023) 03019DOI: https://doi.org/10.1051/e3sconf/202341503019