Shallow-Water Transmission Measurements taken on the New Jersey Continental Shelf
Abstract
Calibrated acoustic measurements were made under calm sea state conditions on the New Jersey shelf near Amcor 6010, a surveyed area with known geophysical properties. The experiment was conducted in 73 m water with supporting measurements of salinity, temperature, and sound speed. These measurements were obtained with a vertical array of 24 equally spaced hydrophones at 2.5 m; one of which was on the bottom. A source towed at either 1/2- or 3/4water depth transmitted one of two sets of four tones spaced between 50 and 600 Hz for each run to ranges of 4 and 26 kkm. The data were processed with Hankel transform and Doppler processing techniques to yield horizontal wave-number spectrum at several depths. Results were obtained along both a constant and gradually varying depth radial. Similar modal interference patterns were observed at the lower frequencies. The constant radial results were compared to calculations using several shallow propagation models employing both geoacoustic profiles derived from geophysical parameters and Yamamoto's (1990) shear wave inversion. Predicated and measured levels generally agreed however, differences in computed and measured modal interference patterns were observed. Sound Propagation, Horizontal Wavenumber spectrum, Shallow water, Vertical array, Hankel transform, Doppler, Modes, Mode shapes, Geoacoustic.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 13, 1992
- Accession Number
- ADA251417
Entities
People
- Lynn M. Dillman
- William Carey
Organizations
- Naval Undersea Warfare Center