minimum values occur at the same times on the three ranges. Maximum 
values occur at 1.5, 25, 55, and 105 hours; minimum values occur at 35, 
60, 90, 95, and 120 hours. Long-term variations are not apparent. 
The values of Kp in the fixed-bed tank as determined by the auto- 
mated method are shown in Table 6. The KR varied from 0.01 to 0.03, 
indicating that the variability in the movable-bed tank was not observed 
in the control tank. Thus, the reflection variability in the movable-bed 
tank was due to the changing profile, with a measurement error of +0.01. 
2. Profile Surveys. 
a. Interpretation of Contour Movement Plots. The profile surveys 
(discussed in Vol. I) measured the three space variables of onshore- 
offshore distance (station), longshore distance (range), and elevation 
at fixed times (Table 2) during the experiment. The CONPLT method (see 
Vol. I) for presenting the data involves fixing the longshore distance by 
selecting data from a given range and analyzing the surveys along that 
range. The surveyed distance-elevation pairs along that range are used to 
obtain the interpolated position of equally spaced depths; e.g., -0.1, 
-0.2, and -0.3 on the hypothetical profile in Figure 4(a). These contour 
positions from each survey are then plotted against time (Fig. 4,b). 
A horizontal line in Figure 4(b) represents no change in contour 
position. An upward-sloping line indicates landward movement of contour 
position (i.e., erosion); a downward-sloping line indicates deposition. 
The slope of a line indicates the rate of erosion or deposition (horizon- 
tally) at that elevation. The three x's at time t2 (Fig. 4,b) indicate 
multiple contour positions at elevation -0.2 which is shown by the inter- 
section of the dashline with profile t2 in Figure 4(a). 
Three types of contour movement plots included in this study are: 
(a) The seawardmost intercepts along one range for selected 
depths; 
(b) the seawardmost intercepts for one selected depth along 
all ranges; and 
(c) all contour intercepts including multiple intercepts 
along one range, for up to 12 selected depths. 
The coordinate system used for the contour movement plots is shown in 
Figure 5. The elevations referred to in the discussion that follows are: 
Oo foot) (G- 0) centimeters)), 0.5) foot (9-1) centameters)),. 0.4) toot Glan 
centimeters), 0.5 foot (15.2 centimeters), 0.6 foot (18.3 centimeters), 
0.8 foot (24.4 centimeters), 0.9 foot (27.4 centimeters), 1.0 foot (30.5 
centimeters), 1.1 feet (33.5 centimeters), 1.3 feet (39.6 centimeters), 
1.4 feet (42.7 centimeters), 2.1 feet (64.0 centimeters), and 2.2 feet 
(67.1 centimeters). 
20 
