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Advances in Geosciences An open-access journal for refereed proceedings and special publications
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Volume 39
Adv. Geosci., 39, 1-7, 2014
https://doi.org/10.5194/adgeo-39-1-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Adv. Geosci., 39, 1-7, 2014
https://doi.org/10.5194/adgeo-39-1-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Apr 2014

01 Apr 2014

Acoustic measurements of a liquefied cohesive sediment bed under waves

R. Mosquera, V. Groposo, and F. Pedocchi R. Mosquera et al.
  • Instituto de Mecánica de los Fluidos e Ingeniería Ambiental (IMFIA), Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay

Abstract. In this article the response of a cohesive sediment deposit under the action of water waves is studied with the help of laboratory experiments and an analytical model. Under the same regular wave condition three different bed responses were observed depending on the degree of consolidation of the deposit: no bed motion, bed motion of the upper layer after the action of the first waves, and massive bed motion after several waves. The kinematic of the upper 3 cm of the deposit were measured with an ultrasound acoustic profiler, while the pore-water pressure inside the bed was simultaneously measured using several pore pressure sensors. A poro-elastic model was developed to interpret the experimental observations. The model showed that the amplitude of the shear stress increased down into the bed. Then it is possible that the lower layers of the deposit experience plastic deformations, while the upper layers present just elastic deformations. Since plastic deformations in the lower layers are necessary for pore pressure build-up, the analytical model was used to interpret the experimental results and to state that liquefaction of a self consolidated cohesive sediment bed would only occur if the bed yield stress falls within the range defined by the amplitude of the shear stress inside the bed.

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