Articles | Volume 12, issue 1
Research article
09 Jan 2024
Research article |  | 09 Jan 2024

Field monitoring of pore water pressure in fully and partly saturated debris flows at Ohya landslide scar, Japan

Shunsuke Oya, Fumitoshi Imaizumi, and Shoki Takayama

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Cited articles

Abe, K. and Konagai, K.: Numerical simulation for runout process of debris flow using depth-averaged material point method, Soils Found., 56, 869–888,, 2016. 
Arattano, M., Marchi, L., and Cavalli, M.: Analysis of debris-flow recordings in an instrumented basin: confirmations and new findings, Nat. Hazards Earth Syst. Sci., 12, 679–686,, 2012. 
Bennett, G., Molnar, P., McArdell, B., Schlunegger, F., and Burlando, P.: Patterns and controls of sediment production, transfer and yield in the Illgraben, Geomorphology, 188, 68–82,, 2013. 
Berger, C., McArdell, B. W., and Schlunegger, F.: Direct measurement of channel erosion by debris flows, Illgraben, Switzerland, J. Geophys. Res., 116, F01002,, 2011. 
Berti, M., Genevois, R., LaHusen, R., Simoni, A., and Tecca, P. R.: Debris flow monitoring in the acquabona watershed on the Dolomites (Italian alps), Phys. Chem. Earth Pt. B, 25, 707–715,, 2000. 
Short summary
The monitoring of pore water pressure in fully and partly saturated debris flows was performed at Ohya landslide scar, central Japan. The pore water pressure in some partly saturated flows greatly exceeded the hydrostatic pressure. The depth gradient of the pore water pressure in the lower part of the flow was generally higher than the upper part of the flow. We conclude that excess pore water pressure is present in many debris flow surges and is an important mechanism in debris flow behavior.