Accession Number:

ADA139765

Title:

Comments and Issues Pertinent to SHARPS III Near-Surface Propagation Modeling

Descriptive Note:

Final rept.

Corporate Author:

NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY STENNIS SPACE CENTER MS

Personal Author(s):

Report Date:

1983-10-01

Pagination or Media Count:

37.0

Abstract:

The propagation submodels of SHARPS III are assessed for their applicability to near-surface sound velocity conditions. The near-surface channel configurations addressed by the current version of SHARPS are too limited. The options are limited to surface ducts and subsurface ducts, as modeled by the Advanced AMOS equations. All other channel configurations are handled by ray theory. A SHARPS input known as the sonic layer depth SLD is demonstrated to be in occasional contrast with the layer depth of a classical surface duct. Simple expressions based on ray theory and phase integral melthods are used to demonstrate the sensitivity of selected acoustic parameters to variations of in-layer sound velocity gradient. Changes that have been made to the original AMOS equations are reviewed, and results from a recent evaluation of several operational surface duct models are presented.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE