Acoustic Tracking of Ocean-Dumped Sewage Sludge

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Science  10 Sep 1976:
Vol. 193, Issue 4257, pp. 1005-1007
DOI: 10.1126/science.193.4257.1005


With a modified 200-kilohertz acoustic echo sounder, it has been possible to detect and map sewage dumped into the ocean over several hours. The three-dimensional distribution of suspended material and its rate of diffusion are indicated after digital processing of the data.