Articles | Volume 25, issue 7
Hydrol. Earth Syst. Sci., 25, 4147–4158, 2021
https://doi.org/10.5194/hess-25-4147-2021
Hydrol. Earth Syst. Sci., 25, 4147–4158, 2021
https://doi.org/10.5194/hess-25-4147-2021

Research article 21 Jul 2021

Research article | 21 Jul 2021

Groundwater fluctuations during a debris flow event in western Norway – triggered by rain and snowmelt

Stein Bondevik and Asgeir Sorteberg

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Cited articles

Azad, R. and Sorteberg, A.: Extreme daily precipitation in coastal western Norway and the link to atmospheric rivers, J. Geophys. Res.-Atmos., 122, 2080–2095, https://doi.org/10.1002/2016jd025615, 2017. 
Bondevik, S.: Groundwater data hillslope, 2010-2013, Anestølen, Sogndal, Western Norway (V1), DataverseNO [dataset], https://doi.org/10.18710/NUFZ4U, 2021. 
Collins, B. D., Stock, J., Weber, L. C., Whitman, K., and Knepprath, N.: Monitoring subsurface hydrologic response for precipitation-induced shallow landsliding in the San Francisco Bay area, California, USA, Proceedings of the 11 th International & 2nd North American Symposium on Landslides, Banff, Canada, 2012. 
Du, X., Fang, M., Lv, H., Cheng, T., Hong, P., and Liu, C.: Effect of snowmelt infiltration on groundwater recharge in a seasonal soil frost area: a case study in Northeast China, Environ. Monit. Assess., 191, 151, https://doi.org/10.1007/s10661-019-7285-7, 2019. 
Fannin, R. J. and Jaakkola, J.: Hydrological response of hillslope soils above a debris-slide headscarp, Can. Geotech. J., 36, 1111–1122, https://doi.org/10.1139/t99-074, 1999. 
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Short summary
Pore pressure is important for the trigger of debris slides and flows. But how, exactly, does the pore pressure vary just before a slide happens? We drilled and installed a piezometer 1.6 m below the ground in a hillslope susceptible to debris flows in western Norway and measured pore pressure and water temperature through the years 2010–2013. We found the largest anomaly in our groundwater data during the storm named Hilde in November in 2013, when a debris flow happened in this slope.