features. For this reason, data interpretation is based primarily on shape and 

 volume trends, not individual data points. 



Profile data were edited for survey error and digitized. Volumes were cal- 

 culated for 9.3-square meter areas between adjacent profiles, using an elevation 

 base of -6 meters MLW and the seabed elevation at each corner of the area. 



Shore-parallel zones within the study area are defined to examine changes in 

 profile shape and volume. The area is divided into the beach, the inshore, and 

 the offshore zones (Fig. 5). The beach zone, which contains the entire backshore 

 and foreshore, extends seaward to about -1 meter MLW. The inshore zone spans 

 the surf zone and consists of a trough, bar, and seaward bar flank. The inshore - 

 offshore zone boundary is positioned on the seaward flank of the surf zone bar 

 between -1.5 and -1.8 meters MLW. The offshore zone extends seaward to about 

 240 meters beyond MLW (^65 meters from base line) to maximum water depths of 

 -4.5 meters MLW. Although individual profiles were measured to more seaward 

 distances, the 365-meter base-line distance was common to all profiles and thus 

 used as a seaward study limit for digitizing the profile data. 



4. Sediment Samples . 



Sediment samples were collected from the upper 2 centimeters of the bed at 

 a 7.6-meter interval along a single profile line C-5+00) near the middle of the 

 study area. The close sample spacing allowed textural representation of all 

 dynamic zones and profile features. The sediment was sieved at a 0.25-phi in- 

 terval using U.S. Standard sieves and statistics were calculated using the equa- 

 tions of Inman (1952) . 



5 . Wave and Current Data . 



Longshore current velocity and direction, breaker height and period, angle 

 of wave approach, and wind velocity and direction were collected from 14 July to 

 16 September, using Littoral Environment Observation (LEO) techniques (Bruno and 

 Hiipakka, 1973). Aerial photography was used to document beach and disposal 

 pile configuration and to examine nearshore circulation in the disposal area. 

 Several short-term ('\. 2 hours) current -meter experiments using the sea sled 

 system (Musialowski, Schwartz, and Teleki, 1977) were conducted to document cur- 

 rent distribution along the nearshore profile. 



III. PHYSICAL CONDITIONS AT STUDY AREA 



1. General . 



Before disposal, the beach and nearshore zone contained a single bar which 

 was shore-parallel, semicontinuous, and located in the outermost part of the surf 

 zone. In general, the beach and nearshore zone consisted of fine-grained (Mn - 

 2.8 phi, 0.14 millimeter), well-sorted [S<\) - 0.40) sand. 



The predicted tidal range during the study period was_mean = 1.0 meter and 

 spring = 1.1 meters. The average (mean) breaker height (H^,) was 0.55 meter and 

 average (mean) period of breaking waves (tj,) was 7.3 seconds. Standard deviation 

 for the breaker height was 0.26 meter and 1.8 seconds for the breaker period. 



The distribution of observed breaker heights and wave periods is shown in 

 Figures 7 and 8. Winds were predominantly from the south, southwest, and west 



