A comparison of two computer models of sound propagation for a wedge shaped ocean over a penetrable bottom

Download
Author
Meisenheimer, Charles Curtis
Date
1993-09Advisor
Coppens, Alan B.
Sanders, J.V.
Metadata
Show full item recordAbstract
The problem of determining the acoustic pressure in a wedge shaped wave guide is examined. Two computer models, one using the method of images, the other using coupled normal modes, are compared. This comparison is over the benchmark wedge of the Acoustic Society of America. Three scenarios were examined: isovelocity water over a pressure release bottom, isovelocity water over a penetrable, lossless bottom, and isovelocity water over a penetrable, lossy bottom. In all cases good agreement was seen between both models, with some differences due to a rigid subbottom in the normal mode model. The strengths and weaknesses of each model is examined. An analytic solution in normal modes of the waveguide with a pressure release surface, rigid bottom, and a discontinuous speed of sound profile is presented. A brief history of research into the wedge problem is included in the introduction. Acoustic models, Computer models, Normal mode determination, Method of images
Collections
Related items
Showing items related by title, author, creator and subject.
-
Comparison of sound pressure in a wedge-shaped ocean as predicted by an image method and a PE model
Kim, Jong Rok (Monterey, California: Naval Postgraduate School, 1990-12);We compare and contrast results of three different models of acoustic propagation in an ocean with a sloping bottom, predicting the pressure field in a wedge-shaped ocean with a pressure release surface and an acoustically ... -
Numerical pulse propagation studies using two classical ocean waveguide models.
Markopoulos, Marinos P. (Monterey, California. Naval Postgraduate School, 1989-12);Numerical pulse propagation studies using two classical ocean waveguide models are performed. The first model is a pressure-release surface with a rigid bottom. The second model is a pressure-release surface with a fluid ... -
The implicit finite-difference (IFD) acoustic model in a shallow water environment
Kosnik, Mark E. (Monterey, California. Naval Postgraduate School, 1984-06);An implicit finite-difference (IFD ) computer model as developed by Jaeger to solve the parabolic equation. The model preserves continuity of pressure and the normal component of particle velocity at the ocean bottom where ...