MELLEN: SOUND PROPAGATION IN A RANDOM MEDIUM 



but only 0.6 in the Gulf of Aden and 0.5 in the Pacific, suggesting 

 possible differences in the boron chemistry of these waters. The 

 regions where large amounts of scattering occur suggest turbulence 

 induced by current shear. In the North Central Pacific and North 

 Central Atlantic and Red Sea, there is no measurable scatter at all. 



(The point of division between moderate and severe scatter is taken 



2 -8 

 as p /a = 10 /m rather than the magnitude of scatter loss since 

 o 



the latter depends strongly on the channel strength.) 



REFERENCES 



Bannister, R. W. , "Discontinuities observed in low-frequency long- 

 range propagation," in these Proceedings, 1976. 



Browning, D. G. , "Project CANUS: Sound propagation and reverberation 

 Measurements in Hudson Bay," NUSC Tech. Report 4221, 1 Dec. 1971. 



, "Environmental factors affecting low -frequency propagation," 



in these Proceedings, 1976. 



Browning, D. G. , R. H. Mellen, J. M. Ross and H. M. Merklinger, 



"Low -frequency sound attenuation in Baffin Bay," 88th ASA Meeting, 

 St. Louis, MO., 5-8 Nov. 1974. 



Browning, D. G. , E. N. Jones and W. H. Thorp, "Low -frequency attenu- 

 ation in the Gulf of Aden," NUSC Tech. Report 4501, 5 Mar. 1973. 



Browning, D. G., and W. H. Thorp, "Attenuation of low-frequency sound 

 in the ocean — NUSC Research Program 1967-1972," NUSC Tech. Report 

 4581, 4 Jan. 1972. 



Browning, D. G. , W. H. Thorp, F. C. Friedel and R. F. LaPlante, 



"Project Hiawatha long-range shallow-water sound propagation in 

 Lake Superior," USL Tech. Memo. No. 221-173-68, 20 June 1968. 



Chernov, L. A., "Wave Propagation in a Random Medium," New York: 

 McGraw-Hill, Chapter II, 1962. 



DiNapoli, F. R. , "Fast field program for multilayered media," NUSC 

 Tech. Report 4103, 26 Aug. 1971. 



410 



