Abstract
Computational predictions of bistatic scattering by spherical objects buried in sand underlying a water column are presented. Excitations with a high-frequency directive transient source both above and below critical grazing angle are considered. The predictions are compared with results from a recent tank experiment for investigating the field scattered by buried spherical objects. An ultrasonic Ricker-like waveform with center frequency 500 kHz was used and both solid and hollow spheres were studied.
A recently developed full-field method, based on a frequency-domain boundary integral equation (BIE) formulation of scattering from bodies and shells in a layered fluid-solid medium is used. Predicted levels of the total scattered energy as a function of vertical scattering angle are found to agree well with observations. Predictions of the energy distributions and arrival times of multiple- and creeping wave scattering components are presented. However, such components were not clearly identifiable in the observed data.
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© 2000 Springer Science+Business Media Dordrecht
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Karasalo, I., Hovem, J. (2000). Transient Bistatic Scattering from Buried Objects. In: Caiti, A., Hermand, JP., Jesus, S.M., Porter, M.B. (eds) Experimental Acoustic Inversion Methods for Exploration of the Shallow Water Environment. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4112-3_10
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DOI: https://doi.org/10.1007/978-94-011-4112-3_10
Publisher Name: Springer, Dordrecht
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