Cross-Spectral Analysis of Midfrequency Acoustic Waves Reflected by the Seafloor
dc.contributor.author
hal.structure.identifier | GUILLON, Laurent
|
dc.contributor.author | HOLLAND, Charles |
dc.contributor.author | BARBER, Christopher |
dc.date.accessioned | 2014 |
dc.date.available | 2014 |
dc.date.issued | 2011 |
dc.date.submitted | 2014 |
dc.identifier.issn | 0364-9059 |
dc.identifier.uri | http://hdl.handle.net/10985/8768 |
dc.description.abstract | Direct path measurements of a single-bottom interacting path on a vertical array are used to probe the seabed structure. The phase of the cross-spectrum, commonly used in engineering acoustics, permits examination of the importance of subbottom paths. When the cross-spectral phase is linear with frequency it implies that source to receiver propagation is dominated by a single path. A linear cross-spectral phase would also satisfy the linear seabed reflection coefficient phase approximation sometimes employed in forward modeling and geoacoustic inversion approaches. Shallow water measurements of the cross-spectrum, however, evidence a strongly nonlinear phase, below about 1500 Hz at one site, and 600 Hz at another site, implying that: 1) the subbottom structure plays an important role (i.e., a seabed half-space approximation would be inappropriate); and 2) the linear reflection phase approximation would be violated at those frequencies |
dc.language.iso | en |
dc.publisher | Institute of Electrical and Electronics Engineers |
dc.rights | Post-print |
dc.title | Cross-Spectral Analysis of Midfrequency Acoustic Waves Reflected by the Seafloor |
dc.identifier.doi | 10.1109/JOE.2011.2114111 |
dc.typdoc | Article dans une revue avec comité de lecture |
dc.localisation | Centre de Paris |
dc.subject.hal | Sciences de l'ingénieur: Acoustique |
ensam.audience | Internationale |
ensam.page | 248-258 |
ensam.journal | IEEE Journal of Oceanic Engineering |
ensam.volume | 36 |
ensam.issue | 2 |
hal.status | unsent |