ni-122 



a = 



ATTENUATION 



db PER BOUNCE 



o ol 



. 7 



° " 3 



-a =10 LOG [|-0.297b^L]=300,H=6 



/ a = 10 LOG |-.0226b^2 



/ r H=3,L=200 ° 



/ /r^a = \0 LOG [i.0243b'''2l H=3, L = 200 (MARSH) 



i_-a=IOL06 [|-.OI53b^/2] L=IOO, H = 2 



J I l_l_L 



2 " 4 6 8 10 20 40 60 80 100 



b = fH, f= FREQUENCY (kc). H = TROUGH TO CREST HEIGHT (ft) 



FIGURE III-44 SEA SURFACE SCATTERING LOSS IN SPECULAR DIRECTION 

 FOR EMITTING RAY IN ISOTHERMAL LAYER 



Arthur B.llittbJnt. 



S-7001-0307 



