Computer Simulation of Coastal Acoustic Tomography by a Two-Dimensional Vortex Model |
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Authors: | Jae-Hun Park Arata Kaneko |
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Institution: | (1) Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan |
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Abstract: | Computer simulation of coastal acoustic tomography with four, five, seven and nine stations was applied to two-dimensional
vortex fields of horizontal domain 5 km × 5 km. Travel time data obtained in reciprocal directions between all pairs of acoustic
stations were analyzed to reconstruct the vortex fields by the stochastic inverse method, reduced to the damped least squares
method. The weighting factor appearing in the inverse analysis was determined by applying the L-curve method, in which a point
making both the size of estimated error ‖y - Ex‖ and solution ‖x‖ as small as possible in a balance is specified as an optimum.
The performance of this method was examined using two-dimensional vortex models which have different wavenumber spectra and
adding the random error of different levels to the travel time difference data y. This study suggests that in the selection
of the optimal weighting factor the horizontal section of the simulated tidal vortex fields can be well reconstructed by the
coastal acoustic tomography system composed of five to seven acoustic stations located in the periphery of the vortex fields.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Coastal acoustic tomography computer simulation L-curve method two-dimensional vortex field |
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