Accession Number : AD0689735

Title :   SOME INVESTIGATIONS OF SOUND-SCATTERING LAYERS NEAR KEY WEST, FLORIDA.

Descriptive Note : Final rept. on phase 1,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Wilson,Donald F. ; Ricalzone,L. C. ; Beckett,R. C.

Report Date : 05 JUN 1968

Pagination or Media Count : 43

Abstract : An attempt was made to correlate local variations in volume scattering near Pourtales Escarpment south of Key West with the nature and occurrence of particulate matter in corresponding regions of the water column. Sound-scattering strength versus depth was measured with an 'acoustic profiler,' which is described, and water samples were obtained by conventional cast. Despite frequent uncertainty concerning the actual depths at which samples were obtained, some good correlations were found between scattering strength, particle count, and particle size distributions determined with an electronic particle counter. The acoustic profiler revealed the presence of numerous scattering layers in the area and provided tentative evidence for rather narrow stratification in some instances. Abnormal concentrations of iron, apparently as ferric hydroxide, were found in discrete zones near the scarp. (Author)

Descriptors :   (*UNDERWATER SOUND, SCATTERING), VOLUME, HYDROGRAPHIC SURVEYING, BIOASSAY, PARTICLES, PARTICLE SIZE, SONAR EQUIPMENT, SEA WATER, SAMPLERS, FLORIDA STRAIT

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE