periods ranging from 17 seconds to 7 seconds are important. All 
others are associated with wave trains less than one-half centi-. 
meter in height. The spectral periods, the wave train amplitude, 
and the 1000 km travel times are shown in Table 14. The sum of 
the heights (crest to trough) in Table 14 is 10 meters within the 
accuracy of the computations so that the amplitude at phase re- 
inforcement equals the maximum crest to trough height of the wave 
groups in equation (6.4). 
Table 14, Component periods, amplitudes, and 
1000 km travel times for the important 
wave trains in equation (6.4). 
Travel time of 
Amplitude (meters) forward edge to a 
a = 
_m Period (seconds) (crest to trough) point 1000 km away 
1 100 210A. ch i lec eee 
6 TG eu/. -006 21.4 hrs. 
7 14.3 0094 25.0 hrs 
8 12.5 0755 28.5 hrs 
9 el eale 2.39 32.0 hrs 
10 10.0 BoD) 35.6 hrs 
ial 9.09 2639 39.2 hrs 
12 8.33 DD) 42.7 hrs 
13 7.69 0094 46.3 hrs 
14 7214 006 49.8 hrs 
= ee 
Figure 11 shows the effect of dispersion on the original wave 
system. The waves which would be observed at a point 1000 km away 
are shown on a time-period coordinate system. A sinusoidal wave 
train with a crest to trough height of .6 em would arrive 21.4 
hours after the wave system started at x equal to zero, as shown on 
the first bar in the upper left of the figure. It would pass 
- lle - 
