60 



STRAIT of JUAN de FUCA 



WINTER PROFILE 



25 m SOURCE 



50 km 

 RANGE < 100km- 



100] 



100 



200 300 500 700 1000 2000 



FREQUENCY, Hz 



Figure 4.6. Propagation loss for optimum receiver depth vs frequency 

 for ranges of 50, 100 and 150 km. Strait of San Juan de Fuca winter 

 (positive gradient) profile; source depth 25 m. 



S 110 - 



120 — 



— ■ 









^^^ RANGE 



> 



^ — ^^^-^ 



^^N. 50 km 





STRAIT of JUAN de FUCA 



\ \ 100 km 



1 



SUMMER PROFILE 

 25 m SOURCE 



.1.1 .1 1 . 



\ 1 50 km 

 1 1 1 1 1 \ 1 



200 300 500 



FREQUENCY, Hz 



Figure 4.7. Propagation loss for optimum receiver depth vs frequency for ranges of 50, 

 1 00 and 1 50 km. Strait of Juan de Fuca summer (non positive) profile ; source 

 depth 25 m. 



44 



