1545 
III. Energy Flux and Dissipation 
11. Extension of the similarity curves for shock wave impulse and 
energy flux. 
li.l Certain of the 0.5 1b. pentolite charges were fired at 
ranges and depths such that the primary shock wave was not dis- 
torted by arrival of the first reflection until after it had 
decayed to negligibly small amplitude. The resulting records 
have been integrated to obtain the impulse and energy flux for 
the primary shock, and the data are shown in Figure 15. Impulse 
was calculated as: 676 
° 
(122) 
where 8 is the average decay constant at the given wi/3/p 
obtained from Figure 2 of NavOrd 424° | Energy flux was cal- 
culated from the purely acoustic equation: 
ao 
E-: af pee 
ne : (123) 
The numerical results used in Figure 15 are summarized in Table 
I. 
It was not practicable to obtain similar data for greater 
ranges or for any of the TNT shots because of interference 
resulting from the arrival of the first reflection. 
12. Ratio of reflected and incident energy flux for bottom reflections 
up to the critical angle of incidence, 
12.1 A few records were available in which it was possible to 
~ 69 « 
