Table 6. Comparison of tests 1 and 2. 
Total Avg Avg Ip Sxy Pop 
run-time H Oh, 
‘ (cm) aria (N/s) | (N/m) | (J/m/s) 
8.17 0.612 1.18 2.20 
ea 03 0.689 eee 14 eal 04 
[stem] =125 | +12.6 7) 53-4 730) 
‘(Test l= est Dy, 100 _ 
Test 1 
eo difference = 
Tests 7 and 8 were both run with a period of 1.90 seconds, a generator 
angle of 20°, and a generator eccentricity of 5.9/7 centimeters. The only 
difference was that the sand feeder, which was located at the SWL for all 
other tests, was moved shoreward 1.4 meters for test 8. The feeder was moved 
because the shoreline at the end of test 7 significantly angled shoreward 
toward the downdrift side of the beach. This can be seen in the test 7 photos 
in Appendix D. The feeder was moved shoreward to see if a straight shoreline 
resulted. It did, as the photos in Appendix D for test 8 show. Another major 
effect was the change in I, from 0./28 newton per second for test 7 to 0.345 
newton per second for test 8, a decrease of 53 percent. Test 8 is excluded 
from the remaining data analyses. 
Test 11 was run with a period of 2.35 seconds, a generator angle of 0°, 
and a generator eccentricity of 5.97 centimeters. The test was meant as a 
control to determine the amount of sand moved by the diffusion caused by 
breaking wavese This value of I, for test 11 was 0.089 newton per second. 
A comparable quantity of sand, 0.059 newton per second, also moved updrift. 
Test 11 is also excluded from the remaining data analyses. 
5. Daily Cycle Graphs. 
As discussed previously, longshore transport could be measured only on a 
daily cycle or test cycle basis. For the typical 24-hour test, six values of 
longshore transport rate were calculated. Each rate covered a period of 4 
run-hourse During this time period, four values of 5 anda were 
calculated, averaged, and related to the corresponding value of I,. These 
values are listed in Appendix F and plotted in Figures 22 and 23. Table 7 
lists the important statistical parameters. 
Table 7. Daily cycle statistics. 
Relation ‘Least squares lines 
ee Y-intercept | Through origin 
| slope _ slope _ 
pe versus us), "| 
I, versus Be 
The square of the correlation coefficients, r2, represents the fraction 
of the variation of I, about its mean which is explained by the abscissa 
eepailg  i62 \se@ne 1) and P are 0./4 and 0.73, respectively. These numbers 
show that Ip) correlates well with both terms to approximately equal 
degrees. The least squares lines listed in Table 7 are in Figures 22 and 23, 
which also include the least squares lines calculated with the limitation that 
the lines pass through the origin. The slopes of these lines are 0.28 for 
the I, versus S xy graph and 0.13 for the I, versus Pop graph. 
38 
