Abstract
Observations of multipath on the western shelf area of the Florida Straits have consistently revealed an intense arrival associated with refracted bottom reflected (RBR) rays/modes. The 'late' or 'focused' arrival is 15 to 20dB higher than other arrivals. Parabolic Equation and Normal Mode propagation models and the shallow water invariant, beta, are used to explain the focusing. The sound speed profile that produces the focusing comes about from a combination of a strong downward refracting layer resulting from the geostrophic equilibrium of the Florida current on top of a well mixed turbulent bottom boundary layer. The resulting c(z) resembles cosh(g(1-z/D)), which produce perfect focusing at every range, that is, all RBR modes have the exact same group velocity.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 106-111 |
| Number of pages | 6 |
| Journal | Acoustic Research Letters Online |
| Volume | 4 |
| DOIs | |
| State | Published - Jun 5 2003 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Focused arrivals in shallow water propagation in the Straits of Florida. / Deferrari, Harry A; Williams, Neil; Nguyen, Hien.
In: Acoustic Research Letters Online, Vol. 4, 05.06.2003, p. 106-111.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Focused arrivals in shallow water propagation in the Straits of Florida
AU - Deferrari, Harry A
AU - Williams, Neil
AU - Nguyen, Hien
PY - 2003/6/5
Y1 - 2003/6/5
N2 - Observations of multipath on the western shelf area of the Florida Straits have consistently revealed an intense arrival associated with refracted bottom reflected (RBR) rays/modes. The 'late' or 'focused' arrival is 15 to 20dB higher than other arrivals. Parabolic Equation and Normal Mode propagation models and the shallow water invariant, beta, are used to explain the focusing. The sound speed profile that produces the focusing comes about from a combination of a strong downward refracting layer resulting from the geostrophic equilibrium of the Florida current on top of a well mixed turbulent bottom boundary layer. The resulting c(z) resembles cosh(g(1-z/D)), which produce perfect focusing at every range, that is, all RBR modes have the exact same group velocity.
AB - Observations of multipath on the western shelf area of the Florida Straits have consistently revealed an intense arrival associated with refracted bottom reflected (RBR) rays/modes. The 'late' or 'focused' arrival is 15 to 20dB higher than other arrivals. Parabolic Equation and Normal Mode propagation models and the shallow water invariant, beta, are used to explain the focusing. The sound speed profile that produces the focusing comes about from a combination of a strong downward refracting layer resulting from the geostrophic equilibrium of the Florida current on top of a well mixed turbulent bottom boundary layer. The resulting c(z) resembles cosh(g(1-z/D)), which produce perfect focusing at every range, that is, all RBR modes have the exact same group velocity.
UR - http://www.scopus.com/inward/record.url?scp=2942702134&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=2942702134&partnerID=8YFLogxK
U2 - 10.1121/1.1591713
DO - 10.1121/1.1591713
M3 - Article
AN - SCOPUS:2942702134
VL - 4
SP - 106
EP - 111
JO - Acoustic Research Letters Online
JF - Acoustic Research Letters Online
SN - 1529-7853
ER -