Seabed shear modulus profile inversion using surface gravity (water) wave-induced bottom motion |
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Authors: | Tokuo Yamamoto Tsuyoshi Torii |
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Institution: | Applied Marine Physics Division, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149, USA |
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Abstract: | Summary. The motion of a layered seabed induced by propagating gravity water waves is modelled by the coupling matrix for a massless incompressible elastic bed according to Yamamoto. An amplitude inversion scheme is developed to extract the bottom shear modulus profile from the motion of the seabed at a point on the bed surface using the linear inverse theory combined with the Yamamoto theory of wave-seabed interaction. Numerical tests using synthetic data without noise confirmed that the inversion is unique and consistent. The inversion technique is applied to a set of field data from the Mississippi River Delta. A good agreement is obtained between the inverted profile and the direct measurements. |
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Keywords: | gravity wave inverse theory seabed shear modulus |
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