TURNING-POINT CONVERGENCE-ZONES IN THE DEEP SEA WITH NEGATIVE VELOCITY GRADIENT

An experimental result in the deep sea is presented. The experiment has shown that, under the condition of negative velocity gradient, the turning-point convergence-zones can be form: d by the sound reflected from the sea bottom. For a source-and receiver-depth at 100 in and a frequency at 200 Hz, the gains of the first three convergence-zones are of the order of 13 to 14 dB. Calculated gains and positions are consistent with experimental results.