Revisions and Notes on a Model for Bubble Attenuation in Near-Surface Propagation.
Abstract
A revised model for predicting surface bubble loss (SBL) as a function of wind speed, surface grazing angle, and frequency is discussed. SBL is defined as the residual loss (i.e., the loss in excess of that due to spreading and chemical absorption) in acoustic energy propagating near the sea surface that is attributable to attenuation by near-surface bubbles. This loss is a key input parameter for predicting bubble attenuation in simulations of weapon-system performance in near-surface environments. The original SBL model was introduced by the Applied Physics Laboratory, University of Washington, in 1993. The revision consists of a new wind-speed threshold for breaking waves and the subsequent onset of bubble production, and an alternative formulation capable of handling more general ray geometries such as a ray vertexing near the surface. Model/data comparisons and examples of the model applied to a linear sound-speed profile are presented. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1994
- Accession Number
- ADA290312
Entities
People
- Peter Hans Dahl
Organizations
- University of Washington