Acoustic Reflections from Cylindrical Blocks on Arctic Ice, 1988
Abstract
In the spring of 1988 acoustic reflections were measured from the submerged ends of cylindrical blocks of arctic ice, in an extension of similar efforts in 1984 and 1986. Blocks with diameters of 27, 38, 58, and 84 cm were individually depressed below the surface of the ice floe so the reflections from the bottoms of the blocks were separable from those off the underside of the ice canopy. The source/receiver was moved horizontally beneath the block to measure the angular response pattern. Measurement to determine the effect of the so- called skeletal layer showed that, compared with solid ice, the layer reduced the reflection at normal incidence by 8-11 dB in the frequency range 20-80 kHz for all blocks. Properties of the skeletal layer and the transition zone were also measured to study the nature of the reflection. (EDC)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1990
- Accession Number
- ADA224808
Entities
People
- G. R. Garrison
- R. E. Francois
- T. Wen
- W. J. Felton
Organizations
- University of Washington