Accession Number : AD0765365

Title :   Cruise AP-4: Acoustic Investigations in the Eastern Tropical Pacific.

Descriptive Note : Master's thesis,

Corporate Author : HAWAII INST OF GEOPHYSICS HONOLULU

Personal Author(s) : Daniel,Thomas Henry

Report Date : MAY 1973

Pagination or Media Count : 100

Abstract : Bathymetric, magnetic, and XBT data collected along a track from Honolulu to Panama in September-October, 1970 are presented and discussed. An acoustic reverberation experiment has demonstrated the feasibility of locating prominent acoustic reflectors over areas greater than 750,000 sq km. The technique involves cross-correlation analysis of the reverberations from two depth charges. A method is presented for unambiguous location of bathymetric reflectors by analysis of signals from only two standard sonobuoys. The removal of ambiguity is accomplished by developing an internally consistent description of the sonobuoy array spacing and orientation changes caused by small-scale turbulence during the experiment. Recommendations are presented for development of the technique to provide improved coverage and bearing determination. The cross-correlation method is contrasted favorably with other techniques of long-range bathymetric mapping. The usefulness of a shipboard programmable-calculator/plotter system is demonstrated for navigation, data reduction, and data analysis. (Modified author abstract)

Descriptors :   (*PACIFIC OCEAN, *OCEANOGRAPHIC DATA), (*OCEAN BOTTOM, ECHO RANGING), ACOUSTIC EQUIPMENT, SHIPBOARD, OCEANOGRAPHIC EQUIPMENT, MARINE GEOPHYSICS, ACOUSTIC DETECTORS, COMPUTERS, NAVIGATIONAL AIDS, UNDERWATER EXPLOSIONS, THESES, OCEAN BOTTOM TOPOGRAPHY

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE