IVe EXPERIMENTAL PROCEDURE 
Each test was composed of three major data collection cycles: an hourly 
cycle, a daily cycle, and a test cycle. For example, wave heights were 
measured every hour (hourly cycle), water temperature was measured twice a day 
(daily cycle), and beach surveys were taken at the end of each test (test 
cycle). The typical test schedule was 4 hourly cycles daily for 6 days for a 
total of 24 run-hours per test. Tests 1 and 2, as discussed later, were 
exceptions to this schedule. Figure 14 is a schematic diagram of the inter- 
relationship of the three cycles. Since waves were run every other day, a 
complete test took about 3 weeks. 
24-HOUR COMPLETE TEST CYCLE 
es oe ee Ol ee 
7 
S Depth Recorded. 
1 HOUR CYCLE ~\. 
—=——-Sand Continually Cleaned 
Beoch Photo ol XX Out of Trap ond Weighed. 
d. 
Breaker Photo Wove Height Measur Longshore Current Measured. 
Woter Depth Corrected 
to 0.71 m, 
7 SAX 
7 ~ 
Beoch Regroded ees ES Basin Droined. 
New Test Voriobles Set. Ba Sd Drainage and Bed-Form Photos Token. 
a SS 
Pe 4 HOUR DAILY CYCLE SK Beoch Surveyed. 
eH RE ERcaaes ———_| mu an : 
! YS All Remaining Sond Picked Up. 
woter Temperoture ! Soy Surf Zone Photos ond Weighed. 
Recorded. i SK Woter Temperature ond 
1 
! 
Figure 14. Schematic diagram of the interrelationship 
of the three experimental cycles. 
1. Hourly Cycle. 
The various types of data collected in a typical hourly cycle are shown in 
Figure 14, along with an indication of time of collection. Before a new hour 
of run-time was started, photos of the beach were taken from overhead with 
both the 35-millimeter camera (Fig. 15) and the view camerae A reference rope 
in the alongshore direction at station 5 and painted arrows on the concrete at 
each station bordering the beach can be seen in Figure 15. Photos, such as 
shown in Figure 15, provide a record of the change in waterline and breaker 
bar throughout the tests. The waves were then turned on and usually, within 5 
minutes of the start, an overhead photo of the breaking wave was taken with 
the view camera. The angle between the breaking wave and the reference rope 
was later measured from the photo to determine the breaking angle of the wave 
(see Fig. 16). Note that this procedure assumes the alongshore direction 
remained constant throughout the test. In actuality, however, the alongshore 
contours are changing, as evidenced in Figure 15. 
After a run-time of 30 minutes, wave data were collected for 2 minutes. A 
sample strip-chart record is shown in Figure 17. The wave height was deter- 
mined from this record. For a given length of wave record, a horizontal line 
was drawn along what appeared to be the average wave-crest elevation. A 
horizontal line was also drawn for the wave troughs. The distance between the 
two lines was measured to determine the average wave height, H. This proce- 
dure assumes that a nearly uniform distribution of wave heights is produced by 
the monochromatic wave generators. 
26 
