Accession Number:

AD0769760

Title:

Two Methods for the Numerical Calculation of Acoustic Normal Modes in the Ocean.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s):

• Evans,Kirk Eden

Report Date:

1973-09-01

Pagination or Media Count:

159.0

Abstract:

Three computer programs were written to find the eigenvalues and eigenfunctions of acoustic normal modes in the ocean. The programs used two different methods an iterative finite difference scheme, and a method based upon the WKBWentzel-Kramers-Brillouin approximation of quantum mechanics. The methods assume a flat fluid bottom and are designed for any arbitrary sound speed profile. While the results of both the finite difference and the WKB methods agreed, the WKB method proved faster. Author

Descriptors:

• (*Underwater sound
• Wave equations)
• Finite difference theory
• Ray tracing
• Partial differential equations
• Numerical integration
• Computer programs
• Theses

Subject Categories:

• Physical and Dynamic Oceanography
• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE