Accession Number : AD0768299

Title :   Hydrology and Acoustic Measurements of Lake Tanganyika.

Descriptive Note : Technical rept.,

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

Personal Author(s) : Jones,Everett N. ; Gorman,John M. ; Thorp,William H. ; Browning,David G.

Report Date : 10 SEP 1973

Pagination or Media Count : 24

Abstract : Lake Tanganyika was selected as an experimental site for the investigation of low-frequency sound attenuation because of its high ambient temperature and low dissolved salt content. Hydrological measurements obtained in support of the acoustic program exactley specified the sound medium and revealed other physical and chemical properties of the lake. Attenuation coefficients determined for the frequency range 800 to 10,000 Hz showed a departure from widely observed sea water results in that no low-frequency excess was discernible, yet attenuation exceeded the viscous absorption. It is proposed that the sound attenuation observed in Lake Tanganyika is attributable to the 43-ppm concentration of magnesium occurring in its waters and a chemical relaxation process related thereto. (Author)

Descriptors :   (*UNDERWATER SOUND, *LAKES), LOW FREQUENCY, ATTENUATION, VELOCITY, SALINITY, MAGNESIUM, EXPERIMENTAL DATA, THERMOCLINES, SUBSAHARAN AFRICA

Subject Categories : Hydrology, Limnology and Potamology
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE