Three-dimensional propagation effects: modeling, observations, suggested benchmark cases
Smith, Kevin B.
MetadataShow full item record
Over the past several years, many acoustic propagation models have been adapted to compute the influence of azimuthal coupling. These so-called 3-D models should provide more accurate predictions of the acoustic field in 3-D variable environments than previous Nx2-D models. However, such advanced 3-D propagation models are generally slower than their Nx2-D predecessors. It is, therefore, important to understand the significance of the difference between 3-D and Nx2-D and when such effects should be considered. Furthermore, as of this date, no formal set of benchmark cases and solutions has been defined to test the accuracy of the various 3-D models currently being used. This paper will provide a general overview of 3-D propagation models and how they can be used to assess the significance of azimuthal coupling in ocean acoustics. Specific examples of such influences will be provided from a 3-D parabolic equation model and compared to results from the corresponding Nx2-D version. Of particular interest will be the pseudo-3-D effects predicted by Nx2-D calculations and the ability to distinguish true 3-D effects in experimental data. Finally, several environmental scenarios will be suggested as possible benchmark cases for future studies.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Chatzigeorgiadis, Filippos (Monterey California. Naval Postgraduate School, 2006-09);The significance of the Radar Cross Section (RCS) in the outcome of military engagements makes its prediction an important problem in modern Electronic Warfare. The POFACETS program, previously developed at the Naval ...
Evaluating the bias of alternative cost progress models: tests using aerospace industry acquisition programs Tagg, David A. (Monterey, California. Naval Postgraduate School, 1992-12);This study evaluates the quality of cost estimates produced by each of four cost progress models--a random walk model, the traditional learning curve model, a production rate model (fixed-variable model), and a model ...
Gonzalez, James Mario (Monterey, California. Naval Postgraduate School, 2003-06);The purpose of this study is to investigate U.S. Naval Academy student predictors of aviation selection for graduates between 1995 and 2002. The main hypothesis is that the background characteristics that predict aviation ...