approximate center line of the structure. At the heads of the structures the baselines 

 were projected seaward along the axis of the jetties. Thirty-four broken or cracked 

 dolosse (seventeen on each jetty) were identified during the walking survey. Armor 

 units with hairline cracks on one side were not counted; only those that were cracked 

 all the way through were considered a break for recording purposes. Breaks were 

 categorized as occurring in the shank or the fluke and as straight across or at some 

 angle to the dolos limb. The shank is the central beam of a dolos, and the flukes are 

 the beams on the ends of the armor unit. The broken units on the north jetty con- 

 sisted of seven mid-shank breaks, eight shank-fluke breaks (shank broken in vicinity 

 of fluke), and five fluke-shank breaks (fluke broken in vicinity of shank). One unit 

 had two breaks. Breaks on the south jetty were characterized as follows: two units, 

 mid-shank breaks; eight units, shank-fluke breaks; and seven units, fluke-shank 

 breaks. Of the 35 breaks, 27 were straight breaks and 8 were angled breaks 

 (approximately 45 deg or greater). Representative broken dolosse are shown in 

 Figures 17-20. 



Approximate locations of the broken/cracked dolos armor units are shown in 

 Figures 21 and 22, respectively, for the north and south jetties; and detailed data 

 obtained during the broken armor unit inventory are shown in Table 4. Armor unit 

 numbers identified in Figures 21 and 22 correspond to those listed in Table 4. As 

 shown on the figures, broken units are concentrated along the seaward ends of the 

 jetties. Eighty-eight percent of the broken units on the north jetty and seventy-one 

 percent of those on the south jetty are located around the monolithic structures at the 

 jetty heads. In addition, more broken dolosse were observed on the south sides of 

 the structures than on the north. If the approximate center lines of the jetties are 

 projected seaward along the axes of the structures, 59 percent of the broken units on 

 the north jetty and 65 percent of those on the south jetty are located on the southern 

 side of the jetties. With regard to distance downslope from the jetty caps, most the 

 broken dolosse appear to be located in the active wave zone. Detailed data 

 obtained during the broken armor unit survey will allow for an accurate indication of 

 new breaks when the structure is revisited at some point in the future. 



26 Chapter 2 Monitoring Plan and Data 



