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A Poro-Elastic Model for Underwater Sand and Silt
Sandy sediments have been shown to follow the Biot model with extensions to account for the squirt flow at the grain contacts. While the frequency dependence of acoustic attenuation in well sorted sands and glass beads in laboratory conditions has been shown to follow the Biot model, it is much more variable in poorly sorted sands and silts, and sediments that are found in-situ. Yamamoto and Turgut have shown that the pore size distribution can have a profound effect on the frequency dependence of the attenuation. The Yamamoto and Turgut model was combined with the Revil, Glover, Pezard and Zamora (RGPZ) model of permeability to produce a new variant of the Biot model that could be adjusted to fit a wide variety of sediment types. By adjusting the width of the pore size distribution, it is possible to smoothly change the frequency dependence of the attenuation. This suggests that pore size distribution may be a critical parameter in the determination of sound attenuation in the seabed, and in the classification of sediment types. Model predictions are compared to measurements from the Shallow Water 2006 experiment as an illustration.
A Poro-Elastic Model for Underwater Sand and Silt
Sandy sediments have been shown to follow the Biot model with extensions to account for the squirt flow at the grain contacts. While the frequency dependence of acoustic attenuation in well sorted sands and glass beads in laboratory conditions has been shown to follow the Biot model, it is much more variable in poorly sorted sands and silts, and sediments that are found in-situ. Yamamoto and Turgut have shown that the pore size distribution can have a profound effect on the frequency dependence of the attenuation. The Yamamoto and Turgut model was combined with the Revil, Glover, Pezard and Zamora (RGPZ) model of permeability to produce a new variant of the Biot model that could be adjusted to fit a wide variety of sediment types. By adjusting the width of the pore size distribution, it is possible to smoothly change the frequency dependence of the attenuation. This suggests that pore size distribution may be a critical parameter in the determination of sound attenuation in the seabed, and in the classification of sediment types. Model predictions are compared to measurements from the Shallow Water 2006 experiment as an illustration.
A Poro-Elastic Model for Underwater Sand and Silt
Chotiros, Nicholas P. (author) / Isakson, Marcia J. (author)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 352-358
2013-06-18
Conference paper
Electronic Resource
English