steep and flat until 75 hours; after 75 hours the area was eroded and 
then remained steep. The flat area between the -0.4- and -0.5-foot con- 
tours oscillated between barred and flat until 100 hours and then became 
a fully developed bar and trough for the remainder of the experiment. 
The bar crest reached -0.5 foot and the bar trough reached -0.6 foot. 
Along range 3 (Fig. 30) the bar near station 2 developed, eroded 
quickly, and then the area around station 2 remained mostly unchanged 
until 85 hours, when this area began eroding and became steep. For the 
first 95 hours the area around station 5 was gently sloping and after 95 
hours became flatter and slightly barred, but with the depth variation 
only a little over 0.1 foot. 
Along range 5 (Fig. 31) the bar near station 2 remained for the first 
30 hours; this area started eroding at 100 hours. The area near station 
5 was flat for most of the first 90 hours and then a bar and trough devel- 
oped, with the bar crest elevation reaching -0.5 foot and the bar trough 
elevation reaching -0.6 foot twice. 
Along range 7 (Fig. 32) the bar near station 2 remained for the first 
85 hours and the trough shoreward of the bar occasionally reached an eleva- 
tion of -0.4 foot. This area began eroding at 120 hours. The area around 
station 5 was gently sloping until 65 hours, and then became flat. How- 
ever, a bar never actually developed as this flat area widened. 
Along range 9 (Fig. 33) the bar near station 2 remained for the first 
90 hours and the trough shoreward of the bar occasionally reached an eleva- 
tion of -0.5 foot. This area began eroding at 95 hours, but never became 
as steep as along the other ranges. A bar developed near station 5 almost 
immediately, with a crest elevation of -0.4 foot. After 100 hours the bar 
crest elevation eroded to -0.5 foot. 
The movements of the -0.3-, -0.4-, -0.5-, and -0.6-foot contours along 
the five ranges are compared in Figure 34. At -0.6 foot the lateral varia- 
tion was minimal during the first 65 hours and the last 10 hours, but from 
65 to 140 hours the position varied as much as 1 foot, with the position 
seawardmost along range 9 and landwardmost along range 1. Lateral varia- 
tion at -0.5 foot was more confused, but range 9 was generally seawardmost 
and range 1 generally landwardmost. The largest and most consistent 
variations occurred at -0.3 and -0.4 foot, also with range 9 seawardmost 
and range 1 landwardmost. 
(3) Offshore Zone. 
(a) Experiment 72B-06. During the first 10 hours, consider- 
able erosion occurred at depths from -0.7 to -1.3 feet, which along with 
the deposition at the outer edge of the inshore (-0.4 to -0.6 foot), 
formed a steep slope at the upper edge of the offshore zone (see Figs. 
13 to 15). The area between the -0.4- and -1.1-foot contours remained 
steep (0.23) throughout the remainder of the experiment. The area between 
the -1.2- and -1.9-foot contours was more gently sloping (0.07) and did 
5) 
