1477 
I. Phase distortion associated with oblique 
reflection from the sea bed. 
Introductione 
1.1 A preliminary discussion of critical angle effects and phase 
distortion of low amplitude exponential shock waves upon 
reflection from the sea bed was given in NavOrd Report No. 424. 
Since publication of this report, the theoretical analysis has 
been improved, extended to include multiple reflections, and 
examination of the experimental records has been completed. 
The results of these investigations are described below. 
Revised theory of critical angle reflection of transient wavese 
2.1 Figure 1 defines the notation for angles of incidence and 
reflection, properties of the adjacent media, pressure wave 
parameters, etc. Using the notation and development given in 
Sections 4.4 through 4.7 of NavOrd 424, we have for the incident, 
reflected, and transmitted waves at angles exceeding the critical: 
(\ 
P: Fe exp [6wlt- ox, +3, 4)/ ) (1) 
ie 
Pa 
i Cx fP [iwlt Gee 0 4) ] (2) 
us EXP [ewe a) + tol S, 
It will be recalled that since region 2 is one in which 
