Laboratory studies of subaqueous debris flows by measurements of pore-fluid pressure and total stress

A set of laboratory experiments on subaqueous debris flows is reported where total stress as well as pore pressure transducers were mounted in the bed. Sediment texture ranging from clayey (viscoplastic) to sandy (granular) were used in the experiments, in order to investigate changes in pressure ev...

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Bibliographic Details
Published in:Marine geology 2004-12, Vol.213 (1), p.403-414
Main Authors: Ilstad, Trygve, Marr, Jeffrey G., Elverhøi, Anders, Harbitz, Carl B.
Format: Article
Language:English
Subjects:
debris flow
flow behaviour
gravity flow
hydroplaning
laboratory experiment
Marine
pore pressure measurements
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Summary:A set of laboratory experiments on subaqueous debris flows is reported where total stress as well as pore pressure transducers were mounted in the bed. Sediment texture ranging from clayey (viscoplastic) to sandy (granular) were used in the experiments, in order to investigate changes in pressure evolution. The pressure readings confirm earlier studies suggesting that the front of the subaqueous clayey debris flow is hydroplaning on a thin layer of water, which causes low bed friction. Fronts of sandy debris flows show a fluidized head where bed friction is minimal.
ISSN:0025-3227
1872-6151
DOI:10.1016/j.margeo.2004.10.016