TAPPERT: SELECTED APPLICATIONS OF THE PARABOLIC-EQUATION METHOD IN 

 UNDERWATER ACOUSTICS 



3r 8z 2 8z \ c-^ / 96 36 96 



Take c = const ; D = const 



1 1 . ,. -T k2 <Q^y z'2 (41) 



<)|j*(z + I z',r) i|j(z - - z',r)> = e2 o 



L 

 V 



z coh ^ k <e2> 1/2 k (6c/c) yjZT 



O on 



Figure 25. DIFFUSION APPROXIMATION 



(42) 



192 



