Table 1 (Continued) 



Dabe(s) Construction and Rehabilitation History 



1957 The 1 ,000-ft-long outer breakwater extension, as authorized in 



1952, was completed. Twelve-ton stone protection was used from sta 

 36+70 to 41+20. From sta 41+20 to 46+70, 25-ton unreinforced 

 tetrapods (1,836 units) were placed on the seaward slope (Fig- 

 ure 5). Model tests were conducted (US Army Engineer Waterways 

 Experiment Station (WES), Hydraulics Laboratory (HL) 1953, 1956). 



1957- Damages occurred to a portion (sta 36+70 to 41+20) of the outer 

 1964 breakwater, and in 1964 were repaired using 12-ton stones and 140 

 25-ton tetrapods. The tetrapods were not model tested for their 

 adequacy for placement in this area, and they were destroyed over a 

 period of years. 



1973 Repairs were made to the concrete cap of the outer breakwater 

 between sta 35+40 and 37+00. 



1974 Rehabilitation of the outer breakwater between sta 34+70 to 37+00 

 was completed. Two layers of 40-ton unreinforced dolosse (246 

 units) were placed on the seaward slope. 



1974 Construction of a 400-ft-long extension of the inner breakwater was 

 completed (Figure 3). Model testing was conducted to determine 

 optimum wave conditions (Senter and Brasfeild 1968, Senter 1971). 



1979 Repairs were made to the following reaches of the outer breakwater 

 using 18- to 30-ton stone: sta 19+00 to 20+00, 22+00 to 24+00, 

 24+60 to 27+20, 28+90 to 29+50, 30+50 to 31+00, and 37+00 to 

 41+20. Repairs to sta 15+50 through 17+50 also were made using 

 stone in the 14- to 25- ton range. 



1983 Major storms in the winter of 1983 resulted in broken dolosse on 

 the outer breakwater. Estimated damage to the structures was 

 $4,400,000. 



1984 Approximately 23,300 tons of stone were placed to repair various 

 sections of the outer breakwater between sta 17+30 to 33+90. 



1986 The outer breakwater is presently in poor condition. The problem 

 area is primarily between sta 34+70 through 37+00 where missing 

 and/or damaged dolosse are apparent. A contract was issued to 

 rehabilitate the dolosse section of the outer structure (sta 34+70 

 through 37+00) with 700 fiber-reinforced 42-ton dolosse. The dolos 

 perimeter used special placement, and the dolosse on the outer por- 

 tion of the seaward transition were entrenched and buttressed with 

 25-ton stone (Baumgartner , Carver, and Davidson 1985). About 80 of 

 the constructed dolosse were stockpiled on the leeward side of the 

 jetty for repair contingencies. This rehabilitation effort was 

 also used to gather data on prototype forces on dolosse. Twenty of 

 the dolosse (painted red) were instrumented and placed in the main 

 dolos section at about sta 36+00. As of this date, no data have 

 been received from the prototype dolos study. 



(Continued) 



12 



