Articles | Volume 9, issue 6
Research article
02 Nov 2021
Research article |  | 02 Nov 2021

Temporal changes in the debris flow threshold under the effects of ground freezing and sediment storage on Mt. Fuji

Fumitoshi Imaizumi, Atsushi Ikeda, Kazuki Yamamoto, and Okihiro Ohsaka

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Cited articles

Anma, S.: Lahars and Slush Lahars on the Slopes of Fuji Volcano, in: Fuji Volcano, edited by: Aramaki, S., Fujii, T., Nakata, S., and Miyaji, N., Yamanashi Institute of Environmental Sciences, Fujiyoshida, 285–301, 2007 (in Japanese with English abstract). 
Bayard, D., Stähli, M., Parriaux, A., and Flühler, H.: The influence of seasonally frozen soil on the snowmelt runoff at two Alpine sites in southern Switzerland, J. Hydrol., 309, 66–84,, 2005. 
Bel, C., Liébault, F., Navratil, O., Eckert, N., Bellot, H., Fontaine, F., and Laigle, D.: Rainfall control of debris-flow triggering in the Réal Torrent, SouthernFrench Prealps, Geomorphology, 291, 17–32,, 2017. 
Berger, C., McArdell, B. W., and Schlunegger, F.: Sediment transfer patterns at the Illgraben catchment, Switzerland: Implications for the time scales of debris flow activities, Geomorphology, 125, 421–432,, 2011. 
Bezak, N., Šraj, M., and Mikoš, M.: Copula-based IDF curves and empirical rainfall thresholds for flash floods and rainfall-induced landslides, J. Hydrol., 541, 272–284,, 2016. 
Short summary
The rainfall threshold for debris flow occurrence was evaluated on Mt. Fuji, Japan. Debris flows during frozen periods were triggered by a smaller magnitude of rainfall than during unfrozen periods. During unfrozen periods, the threshold of maximum hourly rainfall intensity triggering debris flow was higher when the volume of channel deposits was larger. The results suggest that the occurrence of frozen ground needs to be monitored for better debris flow disaster mitigation in cold regions.