

\ r- I 1 1 1 1 1 



111 1 1 





RANGE 



.., 



bO km ^ -" - — ~"V« 







lUUKm^^ ^.^^^^^S^ 







150 km '"^ ''^V 



"^^^.^^^^ 



~ 





^^^T^ 



- 





^^ 



- 



STRAITS OF SICILY 

 WINTER PROFILE 

 165 m BTM DEPTH 

 25 m SOURCE 



- 





1 II 1 1 1 1 1 



Ill 1 1 



200 300 400 500 700 

 FREQUENCY, Hz 



2000 3000 



Figure 4.16. Propagation loss for optimum receiver depth vs frequency for 

 ranges of 50, 100 and 150 km. Straits of Sicily winter profile, 165 m 

 bottom depth; source depth 25 m. 



- 



1 II 1 1 1 1 1 



RANGE 



III 1 1 



bUkm-^ " _^ 



_ 



r\ 



\^ 



- 





\ - 



150 km / 



- 



STRAITS OF SICILY 

 SUMMER PROFILE 

 165 m BTM DEPTH 

 25 m SOURCE 



1 II 1 1 1 1 1 



Ml \ 1 



300 400 500 700 

 FREQUENCY, Hz 



2000 3000 



Figure 4.17. Propagation loss for optimum receiver depth vs frequency for 

 ranges of 50, 100 and 150 km. Straits of Sicily summer profile, 165 m 

 bottom depth; source depth 25 m. 



54 



