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.
| Original language | English (US) |
|---|---|
| Article number | 5766773 |
| Pages (from-to) | 248-258 |
| Number of pages | 11 |
| Journal | IEEE Journal of Oceanic Engineering |
| Volume | 36 |
| Issue number | 2 |
| DOIs | |
| State | Published - Apr 1 2011 |
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All Science Journal Classification (ASJC) codes
- Ocean Engineering
- Electrical and Electronic Engineering
- Mechanical Engineering
Cite this
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Cross-spectral analysis of midfrequency acoustic waves reflected by the seafloor. / Guillon, Laurent; Holland, Charles; Barber, Christopher.
In: IEEE Journal of Oceanic Engineering, Vol. 36, No. 2, 5766773, 01.04.2011, p. 248-258.Research output: Contribution to journal › Review article
TY - JOUR
T1 - Cross-spectral analysis of midfrequency acoustic waves reflected by the seafloor
AU - Guillon, Laurent
AU - Holland, Charles
AU - Barber, Christopher
PY - 2011/4/1
Y1 - 2011/4/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=79957873755&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79957873755&partnerID=8YFLogxK
U2 - 10.1109/JOE.2011.2114111
DO - 10.1109/JOE.2011.2114111
M3 - Review article
VL - 36
SP - 248
EP - 258
JO - IEEE Journal of Oceanic Engineering
JF - IEEE Journal of Oceanic Engineering
SN - 0364-9059
IS - 2
M1 - 5766773
ER -