Environmental Support for High Frequency Acoustic Measurements at NOSC (Naval Ocean Systems Center) Oceanographic Tower, 26 April-7 May 1982. Part 1. Sediment Geoacoustic Properties
Abstract
This is the first of a four-volume report on environmental support for a high frequency acoustic experiment conducted near the Naval Ocean Systems Center (NOSC) Oceanographic Tower, one mile off the California coast near San Diego, 26 Apr-7 May 1982. The objective was to provide improved shallow-water acoustic models required for development of advanced mine-hunting sonar systems. This report, presents, sediment geoacoustic measurements made concurrently with backscatter measurements for the NOSC Tower Experiment. Two sediment types were evident from visual observation and from laboratory analysis of sediment geoacoustic properties. The sediments closest to the transmit-receive tripod were coarse sands with higher compressional wave velocity and lower attenuation and impedance values than those of fine sands surrounding the target spheres. Sediment compressional wave velocity and attenuation increased with depth in the sediment, probably as a results of a decrease in porosity due to compaction and packing. Surficial gradients in sediment geoacoustic properties may be important factors in the prediction of high frequency bottom reverberation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1983
- Accession Number
- ADB076818
Entities
People
- David K. Young
- Michael D. Richardson
- Richard I. Ray
Organizations
- United States Naval Research Laboratory