Hamiltonian 3-D Ray Tracing in the Oceanic Waveguide on the Ellipsoidal Earth

Ray equations based on an acoustic Hamiltonian, and formulated by Jones et al. (1986) for spherical coordinates in NOAA's three dimensional ray tracer HARPO, are adapted to ellipsoidal coordinates in the oceanic waveguide. The ensuing modified HARPO is used to model very long range (up to antip...

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Bibliographic Details
Main Authors: Dworski, George, Mercer, James A.
Other Authors: WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
Format: Text
Language:English
Published: 1990
Subjects:
Physical and Dynamic Oceanography
Seismic Detection and Detectors
*TEST AND EVALUATION
GLOBAL
MODELS
EXPERIMENTAL DESIGN
PATHS
COMPUTER ARCHITECTURE
BOUNDARY LAYER
WAVEGUIDES
LONG RANGE(TIME)
THREE DIMENSIONAL
ELLIPSOIDS
LONG RANGE(DISTANCE)
COORDINATES
HEATING
PATTERNS
ACOUSTICS
OCEANS
PILOT STUDIES
EQUATIONS
EARTH(PLANET)
ASSIMILATION
TRAVEL TIME
INDIAN OCEAN
ANTARCTIC REGIONS
HAMILTONIAN FUNCTIONS
CIRCLES
COMPUTER PROGRAMS
*RAY TRACING
*OCEAN MODELS
*ACOUSTIC COMMUNICATIONS
Antarctic
Heard Island
Indian
Antarc*
Antarctica
Online Access:http://www.dtic.mil/docs/citations/ADA237458
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA237458
Description
Summary:Ray equations based on an acoustic Hamiltonian, and formulated by Jones et al. (1986) for spherical coordinates in NOAA's three dimensional ray tracer HARPO, are adapted to ellipsoidal coordinates in the oceanic waveguide. The ensuing modified HARPO is used to model very long range (up to antipodal) acoustic paths in which the difference between geodesics and great circles is measurable. The eventual objective of this modeling is to extract the predictable part of the travel time trend and fluctuations along several long paths that will be used to monitor hypothetical global warming effects. The requirements for easy assimilation and representation of realistic environmental inputs are discussed. These requirements, when coupled with the possibility of classical chaos in the ray paths, dictate a new software architecture. We use the existing software, however, to breadboard and test features of new ray tracers in the global boundary layer, and to support the experimental design of a forthcoming pilot experiment that will use a transmitter located at Heard Island in the Indian Ocean near Antarctica.

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