ABSTRACT
Acoustic fathometric reflections from depths well above the bottom are phenomena commonly observed off the passes of the Mississippi River. These reflections previously have been attributed to an ooze resulting from flocculation. Systematic observations failed to disclose the presence of the ooze or “sludge” but indicated that the reflections result from strong salinity contrasts. The degree of these contrasts and the presence of the reflections are correlative with the direction of tidal flow.
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