Abstract
Vertically beamformed ocean ambient noise data can be used to infer bottom reflection loss over a broad band of frequencies. Seabed layering introduces a fringe pattern into the reflection loss curve that is related, through a Fourier transform, to the two-way travel time to significant reflectors (caused by layering). The two-way travel times can be used to infer number of layers and depths. In this paper, a global search algorithm is applied to find the sound speed, density and attenuation in each seabed layer. The search is directed by the quality of fit between modeled and inferred reflection loss with the two-way travel times used as an additional constraint. This method avoids one of the usual problems associated with geoacoustic inversion: predetermining the number of significant layers to parametrize the seabed. If too few layers are chosen, the solution does not describe the seabed in enough detail and choosing too many leads to ambiguities in some of the inverted parameters. We will present the application of this technique to simulated and measured data from experiments in the Mediterranean.
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