Three dimensional parabolic equation modeling of an internal wave event during Shallow Water 2006.

2010 ◽  
Vol 127 (3) ◽  
pp. 1786-1786
Author(s):  
Georges A. Dossot ◽  
James H. Miller ◽  
Gopu R. Potty ◽  
James F. Lynch ◽  
Ying‐Tsong Lin ◽  
...  
Keyword(s):  
Parabolic Equation ◽  
Internal Wave ◽  
Shallow Water ◽  
Three Dimensional ◽  
Equation Modeling ◽  
Wave Event

Three dimensional parabolic equation modeling of acoustic intensity fluctuations due to internal wave phenomena.

2011 ◽  
Vol 129 (4) ◽  
pp. 2457-2457
Author(s):  
Georges A. Dossot ◽  
James H. Miller ◽  
Gopu R. Potty ◽  
Kevin B. Smith ◽  
Mohsen Badiey ◽  
...  
Keyword(s):  
Parabolic Equation ◽  
Internal Wave ◽  
Three Dimensional ◽  
Equation Modeling ◽  
Acoustic Intensity ◽  
Intensity Fluctuations ◽  
Wave Phenomena

Underwater acoustic energy fluctuations during strong internal wave activity using a three-dimensional parabolic equation model

2019 ◽  
Vol 146 (3) ◽  
pp. 1875-1887 ◽  
Author(s):  
Georges A. Dossot ◽  
Kevin B. Smith ◽  
Mohsen Badiey ◽  
James H. Miller ◽  
Gopu R. Potty
Keyword(s):  
Parabolic Equation ◽  
Internal Wave ◽  
Three Dimensional ◽  
Equation Model ◽  
Wave Activity ◽  
Acoustic Energy ◽  
Underwater Acoustic

THE USE OF TESSELLATION IN THREE-DIMENSIONAL PARABOLIC EQUATION MODELING

2011 ◽  
Vol 19 (03) ◽  
pp. 221-239 ◽  
Author(s):  
MELANIE E. AUSTIN ◽  
N. ROSS CHAPMAN
Keyword(s):  
Parabolic Equation ◽  
Horizontal Plane ◽  
Three Dimensional ◽  
Computation Time ◽  
Equation Model ◽  
Equation Modeling ◽  
Test Case ◽  
Benchmark Test ◽  
Grid Points ◽  
Grid Layout

A full three-dimensional parabolic equation model (MONM3D) has been developed that incorporates techniques that reduce the required number of model grid points and reduces computation time. The concept of tessellation is implemented in MONM3D, which allows the number of radial paths in the model grid to vary with range from the source, reducing the number of computational points in the horizontal plane. This design establishes a grid layout that is both numerically and computationally desirable. A benchmark test case is used to illustrate the accuracy and efficiency of the model.

Refinement Indicator for Dynamic-Mesh Adaption in Three-Dimensional Shallow-Water Equation Modeling

2018 ◽  
Vol 144 (2) ◽  
pp. 06017026 ◽  
Author(s):  
Gaurav Savant ◽  
Corey J. Trahan ◽  
Charlie Berger ◽  
Jennifer T. McAlpin ◽  
Tate O. McAlpin
Keyword(s):  
Shallow Water ◽  
Shallow Water Equation ◽  
Three Dimensional ◽  
Dynamic Mesh ◽  
Equation Modeling ◽  
Mesh Adaption

scholarly journals Parabolic Equation Modeling of Propagation over Terrain Using Digital Elevation Model

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Xiao-Wei Guan ◽  
Li-Xin Guo ◽  
Ya-Jiao Wang ◽  
Qing-Liang Li
Keyword(s):  
Parabolic Equation ◽  
Digital Elevation Model ◽  
High Efficiency ◽  
Three Dimensional ◽  
Equation Modeling ◽  
Prediction Errors ◽  
Digital Elevation ◽  
Precise Representation ◽  
Cartesian Coordinate ◽  
Elevation Model

The parabolic equation method based on digital elevation model (DEM) is applied on propagation predictions over irregular terrains. Starting from a parabolic approximation to the Helmholtz equation, a wide-angle parabolic equation is deduced under the assumption of forward propagation and the split-step Fourier transform algorithm is used to solve it. The application of DEM is extended to the Cartesian coordinate system and expected to provide a precise representation of a three-dimensional surface with high efficiency. In order to validate the accuracy, a perfectly conducting Gaussian terrain profile is simulated and the results are compared with the shift map. As a consequence, a good agreement is observed. Besides, another example is given to provide a theoretical basis and reference for DEM selection. The simulation results demonstrate that the prediction errors will be obvious only when the resolution of the DEM used is much larger than the range step in the PE method.

Low-Frequency Acoustic Propagation Through Crossing Internal Waves in Shallow Water

2020 ◽  
Vol 28 (03) ◽  
pp. 1950013
Author(s):  
Alexey Shmelev ◽  
Ying-Tsong Lin ◽  
James Lynch
Keyword(s):  
Internal Wave ◽  
Shallow Water ◽  
Internal Waves ◽  
Three Dimensional ◽  
Low Frequency ◽  
Acoustic Energy ◽  
Full Field ◽  
Wave Trains ◽  
Acoustic Ducts ◽  
Numerical Approaches

Crossing internal wave trains are commonly observed in continental shelf shallow water. In this paper, we study the effects of crossing internal wave structures on three-dimensional acoustic ducts with both theoretical and numerical approaches. We show that, depending on the crossing angle, acoustic energy, which is trapped laterally between internal waves of one train, can be either scattered, cross-ducted or reflected by the internal waves in the crossing train. We describe the governing physics of these effects and illustrate them for selected internal wave scenarios using full-field numerical simulations.

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