Accession Number : AD0718330

Title :   The Attenuation of Underwater Sound. A Review of Experimental and Theoretical Investigations,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB

Personal Author(s) : Lauer,Richard B.

Report Date : 02 NOV 1970

Pagination or Media Count : 36

Abstract : Experimental and theoretical investigations of the attenuation of underwater sound are reviewed. The historical development followed invited a separation of the study into three frequency ranges: frequencies above 1000 kHz, frequencies between 10 and 1000 kHz, and frequencies below 10 kHz. The known or postulated primary mechanisms of attenuation, namely, viscosity, magnesium sulfate relaxation, and the structural relaxation of water molecules, are discussed. Empirical and theoretical expressions for the attenuation coefficient in sea water are given in terms of the frequency and the environmental parameters of temperature and pressure. (Author)

Descriptors :   (*UNDERWATER SOUND, SOUND TRANSMISSION), (*SOUND TRANSMISSION, *REVIEWS), ATTENUATION, MEDIUM FREQUENCY, VERY LOW FREQUENCY, VISCOSITY, SEA WATER, MAGNESIUM COMPOUNDS, SULFATES, RELAXATION TIME, MOLECULAR STRUCTURE, TEMPERATURE, PRESSURE, THEOREMS, DEEP WATER

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE