Broadband, Range-Dependent Normal Mode Modeling

• Main Authors: Westwood, Evan K, Knobles, David P, Koch, Robert A
• Other Authors: TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS
• Format: Text
• Language: English
• Published: 1998
• Subjects: Acoustics; *UNDERWATER ACOUSTICS; BROADBAND; MODELS; SOUND TRANSMISSION; Orca
• Online Access: http://www.dtic.mil/docs/citations/ADA551592; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA551592

Our long-term goals are to develop practical approaches to modeling broadband acoustic propagation in range-dependent environments using normal mode theory, to improve the capabilities and efficiency of a specific acousto-elastic normal mode model (ORCA), and to provide support to others in the underwater acoustic community who use our modeling products. Work during FY98 focused on three areas: (1) developing, analyzing, and implementing a method for eliminating the branch line integral from the normal mode solution, (2) investigating the accuracy and characteristics of various adiabatic- and coupled-mode approaches for range-dependent benchmark problems, and (3) completing the documentation of work related to the ONR-sponsored Geoacoustic Inversion Workshop from the previous fiscal year. See also ADM002252.