title: Bayesian geoacoustic inversion of ship noise on a horizontal array.
abstract: This paper applies geoacoustic inversion to low-frequency narrow-band acoustic data from a quiet surface ship recorded on a bottom-moored horizontal line array in shallow water. A Bayesian matched-field inversion method is employed which quantifies geoacoustic uncertainties and allows for meaningful comparison of inversion results from different data sets. Geoacoustic inversion results for ship-noise data are compared with inversion results for multitone data from a towed controlled source collected in the same experiment, and with independent geophysical measurements. To increase the information content of low-level ship-noise data, the effect of including multiple, independent data segments in the inversion is investigated and shown to significantly reduce geoacoustic parameter uncertainties. Geoacoustic uncertainties are also shown to depend on ship range and orientation, with increased uncertainties for long ranges and for the ship stern oriented away from the array.
authors.affiliation: Norwegian Defence Research Establishment, Box 115, 3191 Horten, Norway. dag.tollefsen@ffi.no
authors.forename: Dag
authors.initials: D
authors.lastname: Tollefsen
authors.forename: Stan E
authors.initials: SE
authors.lastname: Dosso
mesh_terms: D000162:Acoustics; D001499:Bayes Theorem; D055593:Geological Phenomena; D005844:Geology; D008962:Models, Theoretical; D009038:Motion; D009624:Noise, Transportation; D009792:Oceans and Seas; D015203:Reproducibility of Results; D012767:Ships; D013018:Sound Spectrography; D014867:Water
chemical_list: D014867:Water