scholarly journals The application of a normal mode perturbation method to assess the effects of sound‐speed fluctuations on the propagation of narrow‐ and broadband acoustic energy in the sea

1992 ◽  
Vol 92 (4) ◽  
pp. 2371-2371
Author(s):  
Hassan B. Ali ◽  
Michael F. Werby ◽  
Michael K. Broadhead
Keyword(s):  
Perturbation Method ◽  
Normal Mode ◽  
Sound Speed ◽  
Acoustic Energy ◽  
Speed Fluctuations

scholarly journals Ocean sound speed fluctuations

Nature ◽  
1980 ◽  
Vol 284 (5754) ◽  
pp. 380-380
Author(s):  
John A. DeSanto
Keyword(s):  
Sound Speed ◽  
Speed Fluctuations

MODE AND PE PREDICTIONS OF PROPAGATION IN RANGE-DEPENDENT ENVIRONMENTS: SWAM'99 WORKSHOP RESULTS

2001 ◽  
Vol 09 (01) ◽  
pp. 205-225
Author(s):  
PETER L. NIELSEN ◽  
FINN B. JENSEN
Keyword(s):  
Normal Mode ◽  
Sound Speed ◽  
Transmission Loss ◽  
Equation Model ◽  
Test Cases ◽  
Homogeneous Fluid ◽  
Flat Bottom ◽  
Propagation Models ◽  
Propagation Analysis ◽  
Model C

Three numerical acoustic models, a coupled normal-mode model (C-SNAP), an adiabatic normal-mode model (PROSIM), and a parabolic equation model (RAM), are applied to test cases defined for the SWAM'99 workshop. The test cases consist of three shallow water (flat bottom) scenarios with range-dependent sound-speed profiles imitating internal wave fields and a shelf-break case, with range-dependent sound-speed profiles and bathymetry. The bottom properties in all the cases are range-independent and modeled as a homogeneous fluid half-space. The results from the modeling are presented as transmission loss for selected acoustic frequencies and source-receiver geometries, and as received time series. The results are compared in order to evaluate the effect of applying different propagation models to the same range-dependent underwater environment. It should be emphasized that the propagation analysis is not an attempt to benchmark the selected propagation models, but to demonstrate the performance of practical, range-dependent models based on different approximations in particular underwater scenarios.

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