O 90 



Q- Tin — 



120 - 



I 1 I I n^ 



STRAITS ^^ 

 OF SICILY'^. 



KOREA STRAIT 



1 T 



"1 — r 



I I I I 



WINTER PROFILES 



50 km RANGE 

 25 m SOURCE 



AVG FROM FIG. 4.20 



STRAITS OF SICILY 



165 m DEPTH 



500 m DEPTH 



KOREA STRAIT 



SAND LAYER 



NO SAND LAYER 



J I I I I I 



J L 



J 1 I I I I I 



50 70 100 



200 300 400 500 700 1000 

 FREQUENCY, Hz 



2000 3000 



Figure 4.24. Comparison of propagation loss for optimum receiver depth vs frequency results for 

 the 50 km range (winter profiles). 



I- 



S 110 - 



30 40 50 70 100 



200 300 400 500 700 1000 2000 

 FREQUENCY, Hz 



Figure 4.25. Comparison of propagation loss for optimum receiver depth vs frequency results for 

 the 50 km range (summer profiles). 



60 



