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.
Showing items related by title, author, creator and subject.
The value of the 1999 USMC retention survey in explaining the factors that influence Marines' subsequent stay/leave behavior Cakmak, Yasar (Monterey California. Naval Postgraduate School, 2004-03);This study examines the factors that influence active duty Marines in their retention decisions. Data from the 1999 US Marine Corps retention survey are matched with actual retention data from personnel files and limited ...
The large-scale environment during the Tropical Cyclone Structure 2008 and THORPEX Pacific Asian regional campaign Trevino, Ricardo A. (Monterey, California. Naval Postgraduate School, 2009-03);This study examines the effects of large-scale circulations (e.g., ENSO, Pacific Decadal Oscillation (PDO), Indian Ocean Dipole (IOD), Antarctic Oscillation (AAO), and Monsoon Trough (MT)) on tropical cyclone (TC) activity ...
An empirical analysis of the patterns in defense industry consolidation and their subsequent impact Nayantara, Hensel (Monterey, California. Naval Postgraduate School, 2007); NPS-AM-07-106The defense industry has witnessed significant consolidation since the end of the Cold War. This paper explores the causes of the wave of defense mergers, as well as their impact. The analysis finds that the frequency of ...