Acoustic backscattering at low grazing angles from the ocean bottom. Part II. Statistical characteristics of bottom backscatter at a shallow water site

1985 ◽  
Vol 77 (3) ◽  
pp. 975-982 ◽  
Author(s):  
N. P. Chotiros ◽  
H. Boehme ◽  
T. G. Goldsberry ◽  
S. P. Pitt ◽  
R. A. Lamb ◽  
...  
Keyword(s):  
Shallow Water ◽  
Statistical Characteristics ◽  
Ocean Bottom ◽  
Bottom Part ◽  
Acoustic Backscattering ◽  
Grazing Angles

Acoustic backscattering at low grazing angles from the ocean bottom. Part I. Bottom backscattering strength

1985 ◽  
Vol 77 (3) ◽  
pp. 962-974 ◽  
Author(s):  
H. Boehme ◽  
N. P. Chotiros ◽  
L. D. Rolleigh ◽  
S. P. Pitt ◽  
A. L. Garcia ◽  
...  
Keyword(s):  
Ocean Bottom ◽  
Bottom Part ◽  
Acoustic Backscattering ◽  
Backscattering Strength ◽  
Grazing Angles

scholarly journals Acoustic backscattering at low grazing angles from the ocean bottom. I. Bottom backscattering strength

1984 ◽  
Vol 75 (S1) ◽  
pp. S30-S30 ◽  
Author(s):  
H. Boehme ◽  
N. P. Chotiros ◽  
L. D. Rolleigh ◽  
S. P. Pitt ◽  
A. L. Garcia ◽  
...  
Keyword(s):  
Ocean Bottom ◽  
Acoustic Backscattering ◽  
Backscattering Strength ◽  
Grazing Angles

TWO MODELING APPROACHES FOR REVERBERATION IN A SHALLOW WATER WAVEGUIDE WHERE THE SCATTERING ARISES FROM A SUB-BOTTOM INTERFACE

2009 ◽  
Vol 17 (01) ◽  
pp. 29-43 ◽  
Author(s):  
CHARLES W. HOLLAND ◽  
DALE D. ELLIS
Keyword(s):  
Shallow Water ◽  
Silty Clay ◽  
Sediment Layer ◽  
Angle Distribution ◽  
Vertical Angle ◽  
Fine Grained ◽  
Bottom Interface ◽  
Grazing Angles ◽  
Scattering Kernel ◽  
Sediment Interface

In shallow water environments where the uppermost sediment layer is a fine-grained fabric (e.g. clay or silty-clay), the observed reverberation may be dominated by scattering from the sub-bottom. Here, reverberation predictions from normal mode and energy flux models are compared for the case where the scattering arises from a sub-bottom half-space under a fine-grained sediment layer. It is shown that in such an environment, the position of the angle of intromission, in addition to the angular dependence of the scattering kernel, is a factor controlling the reverberation and its vertical angle distribution. It is also shown that the reverberation from a sub-bottom horizon is typically governed by higher grazing angles than the case where the scattering occurs at the water–sediment interface. There was generally very close agreement between the models as a function of frequency (200–1600 Hz), layer thickness (0–8 m), and range (1–15 km). The model comparisons, showing some differences, illuminate the result of different approximations in the two approaches.

Dan Field Ocean Bottom Node (OBN) Survey - A Shallow Water Case History

2014 ◽  
Author(s):  
J. Zaske ◽  
P. Hickman ◽  
H. Roende ◽  
S. Mukund ◽  
S. Halliday ◽  
...  
Keyword(s):  
Shallow Water ◽  
Case History ◽  
Ocean Bottom

Large-Scale, Shallow-Water, Ocean-Bottom Seismic Project in Southern Gulf of Mexico

2019 ◽  
Author(s):  
M. Ortin ◽  
M. Salgadoe ◽  
F. Fenoglio ◽  
A. Raj ◽  
M. Sanchez ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Shallow Water ◽  
Large Scale ◽  
Ocean Bottom ◽  
Southern Gulf Of Mexico

RAY CHAOS IN UNDERWATER ACOUSTIC WAVEGUIDES

2008 ◽  
Vol 18 (09) ◽  
pp. 2693-2700 ◽  
Author(s):  
A. L. VIROVLYANSKY
Keyword(s):  
Random Perturbation ◽  
Hamiltonian Formalism ◽  
Statistical Characteristics ◽  
Acoustic Waveguides ◽  
Ray Trajectories ◽  
Grazing Angles ◽  
Ray Path ◽  
Wave Induced ◽  
Ray Chaos ◽  
Analytical Expressions

The chaotic motion of a ray path in a deep water acoustic waveguide with internal-wave-induced fluctuations of the sound speed is investigated. A statistical approach for the description of chaotic rays is discussed. The behavior of ray trajectories is studied using Hamiltonian formalism expressed in terms of action-angle variables. It is shown that the range dependence of the action variable of chaotic ray can be approximated by a random Wiener process. On the basis of this result, analytical expressions for probability density functions of ray parameters are derived. Distributions of coordinates, momenta (grazing angles), and actions of sound rays are evaluated. Numerical simulation shows that statistical characteristics of ray parameters weakly depend on a particular realization of random perturbation giving rise to ray chaos.

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