Modeled High-Frequency Acoustic Backscattered Levels from Range-Independent and Simplistic Range-Dependent Sand Bottoms.
Abstract
Results investigating the effects of variable bottom composition on modeled high-frequency backscattered levels are presented for a typical shallow-water, variable bottom (range-dependent) environment. The modeled environment consisted of a single sound speed profile, a flat sea bottom with range-dependent bottom composition, and a smooth, flat sea surface. Coarse-and fine-grained sandy areas were partitioned in range to create range dependence. Bottom backscattering and reflection loss for each partition were obtained from the recent University of Texas high-frequency ocean bottom backscatter model (N. P. Chotiros and F. A. Boyle, J. Acoust. Soc. Am., vol. 96, no. 5, pt. 2, 3264, (1994)). Maximum differences of S dB were discernible between the fine- coarse-fine sand bottom and a range-independent fine-sand bottom for ranges <500 m. The trend and structure of the backscattered levels were nearly identical for both bottom types. In all cases, surface reverberation had a strong impact on the backscattered levels, trends, and structures. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 21, 1996
- Accession Number
- ADA305987
Entities
People
- Kristen D. Savage
- Roger W. Meredith
Organizations
- United States Naval Research Laboratory