30 CPS SOUND PROPAGATION IN SHALLOW WATER
Abstract
The sound field in the neighborhood of a 30-c frequency-stabilized source, operated at a 40-ft depth (AD-4926, Secret), was investigated at 2 locations in Long Island Sound. At the first station the water depth was 120 ft, over a layer of clay and mud about 430 ft deep. The water depth at the second station was about 50 to 60 ft, over a layer of sediment about 100 ft thick. Curves of pressure vs range out to several thousand years showed irregular patterns of maxima and minima with an over-all dependence on range which varies from r to the minus power of 1/2 to greater than r to the minus power of 1. According to normal mode theory, 6 propagating modes were predicted for the station with deeper water and basement depths. A choice of parameters for a three layer model yielded curves which were similar to the experimental curves. At the shallower station on 2 propagated modes were predicted. A pattern similar to the regular pattern expected from the interference of these 2 modes appeared on only one experimental curve.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 1953
- Accession Number
- AD0011374
Entities
People
- G. E. Becker
- H. L. Poss
- R. A. Frosch
- R. O. Carlson
Organizations
- Columbia University