Accession Number:

ADA612578

Title:

Near-Axial Interference Effects for Long-Range Sound Transmissions through Ocean Internal Waves

Descriptive Note:

Annual rept.

Corporate Author:

WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Report Date:

2006-09-30

Pagination or Media Count:

9.0

Abstract:

The long-term goal of this effort is to provide an improved way of interpreting the experimentally observed time-of-arrival patterns in long-range, low-frequency propagation in the deep ocean. In many long-range propagation studies the source and receiver are placed close to the depth of the waveguide SOFAR axis to minimize the interaction of the acoustic field with the oceans surface and bottom. The most pronounced characteristics of the time-of-arrival patterns for these experiments are early geometric-like arrivals followed by a crescendo of energy that propagates along the axis. In Fig.1 adapted from one published in Ref. 1 these characteristics are clearly shown for a time-of-arrival pattern measured during the Acoustic Engineering Test AET of the Acoustic Thermometry of Ocean Climate ATOC project conducted in the eastern North Pacific Ocean.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE