Accession Number : AD0782269

Title :   Attenuation Research: A Case for Lake Tanganyika.

Descriptive Note : Technical memo.,


Personal Author(s) : Browning,D. G. ; Jones,E. N. ; Mellen,R. H. ; Thorp,W. H.

Report Date : 02 MAY 1968

Pagination or Media Count : 5

Abstract : The results of the recent Lake Superior experiment indicate that the anomalous low frequency attenuation observed in sea water also exists in freshwater. Although this would tend to eliminate some possible explanations such as dissolved salts, it does not uniquely determine the cause of the anomaly. In order to acertain which of the remaining possibilities, chemical relaxation, dissolved sediments, or channel leakage is correct, another experiment must be performed in water of a markedly different temperature. The ideal location is Lake Tanganyika. Its average water temperature is above 22C as compared to 4C for most oceans and Lake Superior. If the anomalous attenuation is due to a chemical process, the relaxation frequency would be roughly doubled by this temperature change.

Descriptors :   *Underwater sound, *Acoustic attenuation, Sea water, Fresh water, Lakes

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE