BROWNING: ENVIRONMENTAL FACTORS AFFECTING LOW FREQUENCY 

 PROPAGATION IN THE OCEAN 



The curve of Figure 22 indicates a region where diffraction from 

 the sound channel would not contaminate the attenuation coefficient 

 calculations. In the region above the curve (for example, at 60 

 Hz and a bottom depth of 12,000 feet) there is no significant 

 loss from the sound channel. On the other hand, below the curve (for 

 example, at 10 Hz and a depth of 4000 feet) , any attempt to make an 

 attenuation measurement would certainly be contaminated. 



In summary, this represents our first attempts to compare what 

 the modelers are doing with what we are trying to do experimentally. 

 This relationship can lead to improved determination of attenuation. 



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